From 584885c78d9d0546a48a7d2b038ac5395b46a966 Mon Sep 17 00:00:00 2001
From: Danilo Bargen <mail@dbrgn.ch>
Date: Fri, 21 Dec 2018 23:07:41 +0100
Subject: [PATCH] Make network support optional

---
 .circleci/config.yml |   2 +
 Cargo.lock           | 651 ++++++++++++++++++++++++-------------------
 Cargo.toml           |   6 +-
 README.md            |  14 +
 src/cache.rs         |  75 ++++-
 src/error.rs         |   3 +
 src/main.rs          |  79 +++++-
 tests/lib.rs         |  75 +++--
 8 files changed, 580 insertions(+), 325 deletions(-)

diff --git a/.circleci/config.yml b/.circleci/config.yml
index f432d19..fb96391 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -18,9 +18,11 @@ jobs:
       # Build
       - run: cargo build
       - run: cargo build --features logging
+      - run: cargo build --no-default-features
 
       # Run tests
       - run: cargo test
+      - run: cargo test --no-default-features
 
       - save_cache:
           key: v1-cargo-cache-{{ arch }}-{{ .Branch }}
diff --git a/Cargo.lock b/Cargo.lock
index db7c19b..16e09e7 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,3 +1,11 @@
+[[package]]
+name = "MacTypes-sys"
+version = "1.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "adler32"
 version = "1.0.3"
@@ -5,10 +13,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "aho-corasick"
-version = "0.6.8"
+version = "0.6.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "memchr 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memchr 2.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -18,7 +26,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "arrayvec"
-version = "0.4.7"
+version = "0.4.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "nodrop 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -40,7 +48,7 @@ name = "atty"
 version = "0.2.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
  "termion 1.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -88,14 +96,14 @@ name = "cargo_metadata"
 version = "0.2.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "serde 1.0.80 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.80 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.32 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.84 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.84 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.34 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "cc"
-version = "1.0.25"
+version = "1.0.28"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -126,11 +134,11 @@ dependencies = [
  "quine-mc_cluskey 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex-syntax 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "semver 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.80 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.80 (registry+https://github.com/rust-lang/crates.io-index)",
- "toml 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.84 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.84 (registry+https://github.com/rust-lang/crates.io-index)",
+ "toml 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicode-normalization 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "url 1.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -147,7 +155,7 @@ version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "core-foundation-sys 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -155,7 +163,7 @@ name = "core-foundation-sys"
 version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -167,35 +175,38 @@ dependencies = [
 ]
 
 [[package]]
-name = "crossbeam-deque"
-version = "0.6.2"
+name = "crc32fast"
+version = "1.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "crossbeam-epoch 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "crossbeam-utils 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "crossbeam-deque"
+version = "0.6.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "crossbeam-epoch 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "crossbeam-epoch"
-version = "0.6.1"
+version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "arrayvec 0.4.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "arrayvec 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "crossbeam-utils 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "memoffset 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "scopeguard 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "crossbeam-utils"
-version = "0.5.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
-name = "crossbeam-utils"
-version = "0.6.1"
+version = "0.6.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -211,10 +222,10 @@ name = "docopt"
 version = "0.8.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.80 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.80 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.84 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.84 (registry+https://github.com/rust-lang/crates.io-index)",
  "strsim 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -230,7 +241,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "encoding_rs"
-version = "0.8.12"
+version = "0.8.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -242,9 +253,9 @@ version = "0.5.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "atty 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "humantime 1.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "humantime 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "termcolor 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -253,26 +264,38 @@ name = "escargot"
 version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "serde 1.0.80 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.32 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.84 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.34 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "escargot"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.84 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.34 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "filetime"
-version = "0.2.1"
+version = "0.2.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "redox_syscall 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.50 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "flate2"
-version = "1.0.4"
+version = "1.0.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crc32fast 1.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
  "miniz-sys 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "miniz_oxide_c_api 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -328,7 +351,7 @@ version = "0.1.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
- "num_cpus 1.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num_cpus 1.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -341,24 +364,24 @@ dependencies = [
 
 [[package]]
 name = "h2"
-version = "0.1.13"
+version = "0.1.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "byteorder 1.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "bytes 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
- "http 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "http 0.1.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "indexmap 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "slab 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "string 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "string 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "http"
-version = "0.1.13"
+version = "0.1.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bytes 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -373,7 +396,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "humantime"
-version = "1.1.1"
+version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "quick-error 1.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -381,27 +404,27 @@ dependencies = [
 
 [[package]]
 name = "hyper"
-version = "0.12.14"
+version = "0.12.19"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bytes 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures-cpupool 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "h2 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
- "http 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "h2 0.1.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "http 0.1.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "httparse 1.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "iovec 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "itoa 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "net2 0.2.33 (registry+https://github.com/rust-lang/crates.io-index)",
- "time 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "time 0.1.41 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-executor 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-reactor 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-reactor 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-tcp 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-threadpool 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-timer 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-threadpool 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-timer 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "want 0.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -412,7 +435,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bytes 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
- "hyper 0.12.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hyper 0.12.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "native-tls 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -442,7 +465,7 @@ name = "iovec"
 version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -475,44 +498,41 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "lazy_static"
-version = "1.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "version_check 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "lazycell"
 version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "lazycell"
+version = "1.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "libc"
-version = "0.2.43"
+version = "0.2.45"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "libflate"
-version = "0.1.18"
+version = "0.1.19"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "adler32 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "byteorder 1.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "crc 1.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crc32fast 1.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "lock_api"
-version = "0.1.4"
+version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "owning_ref 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "owning_ref 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "scopeguard 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "log"
-version = "0.4.5"
+version = "0.4.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -525,11 +545,11 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "memchr"
-version = "2.1.0"
+version = "2.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
  "version_check 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -562,8 +582,8 @@ name = "miniz-sys"
 version = "0.1.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cc 1.0.25 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.28 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -579,9 +599,9 @@ name = "miniz_oxide_c_api"
 version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cc 1.0.25 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.28 (registry+https://github.com/rust-lang/crates.io-index)",
  "crc 1.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
  "miniz_oxide 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -594,9 +614,9 @@ dependencies = [
  "fuchsia-zircon-sys 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "iovec 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "lazycell 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazycell 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "miow 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "net2 0.2.33 (registry+https://github.com/rust-lang/crates.io-index)",
  "slab 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -609,7 +629,7 @@ version = "0.6.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "iovec 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
  "mio 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -629,16 +649,16 @@ name = "native-tls"
 version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "openssl 0.10.15 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "openssl 0.10.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "openssl-probe 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "openssl-sys 0.9.39 (registry+https://github.com/rust-lang/crates.io-index)",
+ "openssl-sys 0.9.40 (registry+https://github.com/rust-lang/crates.io-index)",
  "schannel 0.1.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "security-framework 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "security-framework-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "tempfile 3.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "security-framework-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tempfile 3.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -647,7 +667,7 @@ version = "0.2.33"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -668,23 +688,23 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "num_cpus"
-version = "1.8.0"
+version = "1.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "openssl"
-version = "0.10.15"
+version = "0.10.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "foreign-types 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "openssl-sys 0.9.39 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "openssl-sys 0.9.40 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -694,18 +714,18 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "openssl-sys"
-version = "0.9.39"
+version = "0.9.40"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cc 1.0.25 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.28 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
  "pkg-config 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "vcpkg 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "owning_ref"
-version = "0.3.3"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "stable_deref_trait 1.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -716,7 +736,7 @@ name = "parking_lot"
 version = "0.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "lock_api 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lock_api 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -725,10 +745,10 @@ name = "parking_lot_core"
 version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.5.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "smallvec 0.6.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "smallvec 0.6.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -786,7 +806,7 @@ dependencies = [
  "float-cmp 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "normalize-line-endings 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "predicates-core 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -805,7 +825,7 @@ dependencies = [
 
 [[package]]
 name = "proc-macro2"
-version = "0.4.20"
+version = "0.4.24"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -832,10 +852,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "quote"
-version = "0.6.8"
+version = "0.6.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 0.4.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.24 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -844,7 +864,7 @@ version = "0.4.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "fuchsia-zircon 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -855,11 +875,38 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cloudabi 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "fuchsia-zircon 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_core 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "rand"
+version = "0.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cloudabi 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fuchsia-zircon 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_chacha 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_hc 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_isaac 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_pcg 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_xorshift 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "rand_chacha"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "rand_core 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "rand_core"
 version = "0.2.2"
@@ -873,9 +920,42 @@ name = "rand_core"
 version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "rand_hc"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "rand_core 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "rand_isaac"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "rand_core 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "rand_pcg"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "rand_core 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "rand_xorshift"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "rand_core 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "redox_syscall"
-version = "0.1.40"
+version = "0.1.50"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -883,7 +963,7 @@ name = "redox_termios"
 version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "redox_syscall 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.50 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -891,23 +971,23 @@ name = "regex"
 version = "0.2.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "aho-corasick 0.6.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "memchr 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "aho-corasick 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memchr 2.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex-syntax 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "thread_local 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "utf8-ranges 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "utf8-ranges 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "regex"
-version = "1.0.5"
+version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "aho-corasick 0.6.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "memchr 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex-syntax 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "aho-corasick 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memchr 2.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex-syntax 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "thread_local 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "utf8-ranges 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "utf8-ranges 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -920,15 +1000,15 @@ name = "regex-syntax"
 version = "0.5.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "ucd-util 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ucd-util 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "regex-syntax"
-version = "0.6.2"
+version = "0.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "ucd-util 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ucd-util 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -946,22 +1026,22 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "base64 0.9.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "bytes 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "encoding_rs 0.8.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "encoding_rs 0.8.13 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
- "http 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
- "hyper 0.12.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "http 0.1.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hyper 0.12.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "hyper-tls 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libflate 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libflate 0.1.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "mime 0.3.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "mime_guess 2.0.0-alpha.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "native-tls 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.80 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.32 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_urlencoded 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.84 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.34 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_urlencoded 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "url 1.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "uuid 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -975,7 +1055,7 @@ dependencies = [
 
 [[package]]
 name = "ryu"
-version = "0.2.6"
+version = "0.2.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -985,7 +1065,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "same-file"
-version = "1.0.3"
+version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "winapi-util 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -996,7 +1076,7 @@ name = "schannel"
 version = "0.1.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1012,17 +1092,18 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "core-foundation 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "core-foundation-sys 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "security-framework-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "security-framework-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "security-framework-sys"
-version = "0.2.1"
+version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
+ "MacTypes-sys 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "core-foundation-sys 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1048,41 +1129,41 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "serde"
-version = "1.0.80"
+version = "1.0.84"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "serde_derive 1.0.80 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.84 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "serde_derive"
-version = "1.0.80"
+version = "1.0.84"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 0.4.20 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 0.6.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.24 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.23 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "serde_json"
-version = "1.0.32"
+version = "1.0.34"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "itoa 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "ryu 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.80 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ryu 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.84 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "serde_urlencoded"
-version = "0.5.3"
+version = "0.5.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "dtoa 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "itoa 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.80 (registry+https://github.com/rust-lang/crates.io-index)",
- "url 1.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.84 (registry+https://github.com/rust-lang/crates.io-index)",
+ "url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1097,7 +1178,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "smallvec"
-version = "0.6.6"
+version = "0.6.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "unreachable 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1110,7 +1191,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "string"
-version = "0.1.1"
+version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -1120,22 +1201,22 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "syn"
-version = "0.15.13"
+version = "0.15.23"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 0.4.20 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 0.6.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.24 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "tar"
-version = "0.4.17"
+version = "0.4.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "filetime 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "redox_syscall 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
+ "filetime 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.50 (registry+https://github.com/rust-lang/crates.io-index)",
  "xattr 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1148,20 +1229,20 @@ dependencies = [
  "clippy 0.0.174 (registry+https://github.com/rust-lang/crates.io-index)",
  "docopt 0.8.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "env_logger 0.5.13 (registry+https://github.com/rust-lang/crates.io-index)",
- "escargot 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "flate2 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "escargot 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "flate2 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "predicates 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "reqwest 0.9.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.80 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.80 (registry+https://github.com/rust-lang/crates.io-index)",
- "tar 0.4.17 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.84 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.84 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tar 0.4.20 (registry+https://github.com/rust-lang/crates.io-index)",
  "tempdir 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "time 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
- "toml 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "time 0.1.41 (registry+https://github.com/rust-lang/crates.io-index)",
+ "toml 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "utime 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "walkdir 2.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "xdg 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "walkdir 2.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "xdg 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1175,13 +1256,13 @@ dependencies = [
 
 [[package]]
 name = "tempfile"
-version = "3.0.4"
+version = "3.0.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.5.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "redox_syscall 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.50 (registry+https://github.com/rust-lang/crates.io-index)",
  "remove_dir_all 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -1199,8 +1280,8 @@ name = "termion"
 version = "1.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "redox_syscall 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.50 (registry+https://github.com/rust-lang/crates.io-index)",
  "redox_termios 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1209,38 +1290,39 @@ name = "thread_local"
 version = "0.3.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "time"
-version = "0.1.40"
+version = "0.1.41"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "redox_syscall 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.50 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "tokio"
-version = "0.1.11"
+version = "0.1.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bytes 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
  "mio 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num_cpus 1.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-codec 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-current-thread 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-current-thread 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-executor 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-fs 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-reactor 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-reactor 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-tcp 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-threadpool 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-timer 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-udp 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-uds 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-threadpool 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-timer 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-udp 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-uds 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1255,7 +1337,7 @@ dependencies = [
 
 [[package]]
 name = "tokio-current-thread"
-version = "0.1.3"
+version = "0.1.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1277,7 +1359,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-threadpool 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-threadpool 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1287,20 +1369,20 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bytes 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "tokio-reactor"
-version = "0.1.6"
+version = "0.1.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "crossbeam-utils 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
- "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "mio 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
- "num_cpus 1.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num_cpus 1.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "slab 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-executor 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1317,29 +1399,29 @@ dependencies = [
  "iovec 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "mio 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-reactor 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-reactor 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "tokio-threadpool"
-version = "0.1.8"
+version = "0.1.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "crossbeam-deque 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "crossbeam-utils 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-deque 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "num_cpus 1.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.5.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num_cpus 1.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-executor 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "tokio-timer"
-version = "0.2.7"
+version = "0.2.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "crossbeam-utils 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
  "slab 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-executor 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1347,40 +1429,41 @@ dependencies = [
 
 [[package]]
 name = "tokio-udp"
-version = "0.1.2"
+version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bytes 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "mio 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-codec 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-reactor 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-reactor 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "tokio-uds"
-version = "0.2.3"
+version = "0.2.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bytes 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
  "iovec 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "mio 0.6.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "mio-uds 0.6.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-codec 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-reactor 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-reactor 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "toml"
-version = "0.4.8"
+version = "0.4.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "serde 1.0.80 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.84 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1395,7 +1478,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "ucd-util"
-version = "0.1.1"
+version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -1447,7 +1530,7 @@ dependencies = [
 
 [[package]]
 name = "url"
-version = "1.7.1"
+version = "1.7.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "idna 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1457,7 +1540,7 @@ dependencies = [
 
 [[package]]
 name = "utf8-ranges"
-version = "1.0.1"
+version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -1466,7 +1549,7 @@ version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1495,10 +1578,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "walkdir"
-version = "2.2.5"
+version = "2.2.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "same-file 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "same-file 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi-util 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -1509,7 +1592,7 @@ version = "0.0.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
- "log 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "try-lock 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1573,19 +1656,20 @@ name = "xattr"
 version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "xdg"
-version = "2.1.0"
+version = "2.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [metadata]
+"checksum MacTypes-sys 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7dbbe033994ae2198a18517c7132d952a29fb1db44249a1234779da7c50f4698"
 "checksum adler32 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)" = "7e522997b529f05601e05166c07ed17789691f562762c7f3b987263d2dedee5c"
-"checksum aho-corasick 0.6.8 (registry+https://github.com/rust-lang/crates.io-index)" = "68f56c7353e5a9547cbd76ed90f7bb5ffc3ba09d4ea9bd1d8c06c8b1142eeb5a"
+"checksum aho-corasick 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)" = "1e9a933f4e58658d7b12defcf96dc5c720f20832deebe3e0a19efd3b6aaeeb9e"
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 "checksum ws2_32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "d59cefebd0c892fa2dd6de581e937301d8552cb44489cdff035c6187cb63fa5e"
 "checksum xattr 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "244c3741f4240ef46274860397c7c74e50eb23624996930e484c16679633a54c"
-"checksum xdg 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "a66b7c2281ebde13cf4391d70d4c7e5946c3c25e72a7b859ca8f677dcd0b0c61"
+"checksum xdg 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d089681aa106a86fade1b0128fb5daf07d5867a509ab036d99988dec80429a57"
diff --git a/Cargo.toml b/Cargo.toml
index d4deb05..a8c99bf 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -28,17 +28,19 @@ time = "0.1.38"
 toml = "0.4.6"
 walkdir = "2.0.1"
 xdg = "2.1.0"
-reqwest = "0.9.5"
+reqwest = { version = "0.9.5", optional = true }
 
 [dev-dependencies]
 assert_cmd = "0.10"
-escargot = "0.3"
+escargot = "0.4"
 predicates = "1.0"
 tempdir = "^0.3"
 utime = "0.2.0"
 
 [features]
+default = ["networking"]
 logging = ["env_logger"]
+networking = ["reqwest"]
 
 [profile.release]
 lto = true
diff --git a/README.md b/README.md
index 6c4fa13..dbefa2a 100644
--- a/README.md
+++ b/README.md
@@ -132,6 +132,7 @@ To enable the log output, set the `RUST_LOG` env variable:
     $ export RUST_LOG=tldr=debug
 
 
+
 ## Configuration
 
 The tldr command can be customized with a config file called `config.toml`.
@@ -189,12 +190,25 @@ To run tests:
 
     $ cargo test
 
+(Note that integration tests are a bit slow, since they invoke `cargo build` in different configurations.)
+
 To run lints:
 
     $ rustup component add clippy
     $ cargo clean && cargo clippy
 
 
+## Build Flags
+
+tealdeer knows the following feature flags:
+
+- `logging`: This enables logging support through [env_logger](https://docs.rs/env_logger/*/env_logger/)
+- `networking`: This enables support for updating the cache from the internet
+
+By default, only the `networking` feature is enabled. To build tealdeer without
+networking support, use the `--no-default-features` Cargo flag.
+
+
 ## License
 
 Licensed under either of
diff --git a/src/cache.rs b/src/cache.rs
index d08615f..eef99a7 100644
--- a/src/cache.rs
+++ b/src/cache.rs
@@ -1,15 +1,19 @@
+#[cfg(feature = "networking")]
+use std::borrow::Cow;
 use std::env;
 use std::fs;
 use std::io::Read;
-use std::path::PathBuf;
+use std::path::{Path, PathBuf};
 
-#[cfg(unix)]
+#[cfg(all(unix, feature = "networking"))]
 use std::os::unix::fs::MetadataExt;
 
+#[cfg(feature = "networking")]
 use reqwest::{Client, Proxy};
 use flate2::read::GzDecoder;
 use log::debug;
 use tar::Archive;
+#[cfg(feature = "networking")]
 use time;
 use walkdir::{DirEntry, WalkDir};
 use xdg::BaseDirectories;
@@ -17,19 +21,36 @@ use xdg::BaseDirectories;
 use crate::error::TealdeerError::{self, CacheError, UpdateError};
 use crate::types::OsType;
 
+/// A cache update source.
+#[derive(Debug)]
+pub enum Source {
+    /// Load the archive from the file system.
+    File(PathBuf),
+
+    /// Load the archive from the network.
+    #[cfg(feature = "networking")]
+    Url(Cow<'static, str>),
+
+    /// No source is defined.
+    #[cfg(not(feature = "networking"))]
+    None,
+}
+
 #[derive(Debug)]
 pub struct Cache {
-    url: String,
+    /// The cache source. Either an URL or a file path.
+    source: Source,
+    /// The target OS type.
     os: OsType,
 }
 
 impl Cache {
-    pub fn new<S>(url: S, os: OsType) -> Self
+    pub fn new<S>(source: S, os: OsType) -> Self
     where
-        S: Into<String>,
+        S: Into<Source>,
     {
         Self {
-            url: url.into(),
+            source: source.into(),
             os,
         }
     }
@@ -60,8 +81,20 @@ impl Cache {
         Ok(xdg_dirs.get_cache_home())
     }
 
-    /// Download the archive
-    fn download(&self) -> Result<Vec<u8>, TealdeerError> {
+    /// Load the archive from the file system.
+    fn load_from_file(path: &Path) -> Result<Vec<u8>, TealdeerError> {
+        let mut f = fs::File::open(path)
+            .map_err(|e| UpdateError(format!("Could not open file: {}", e)))?;
+        let mut buf: Vec<u8> = vec![];
+        let bytes_read = f.read_to_end(&mut buf)
+            .map_err(|e| UpdateError(format!("Could not read file: {}", e)))?;
+        debug!("{} bytes loaded from filesystem", bytes_read);
+        Ok(buf)
+    }
+
+    /// Load the archive from the network.
+    #[cfg(feature = "networking")]
+    fn load_from_network(url: &str) -> Result<Vec<u8>, TealdeerError> {
         let mut builder = Client::builder();
         if let Ok(ref host) = env::var("HTTP_PROXY") {
             if let Ok(proxy) = Proxy::http(host) {
@@ -74,13 +107,31 @@ impl Cache {
             }
         }
         let client = builder.build().unwrap_or_else(|_| Client::new());
-        let mut resp = client.get(&self.url).send()?;
+        let mut resp = client.get(url).send()?;
         let mut buf: Vec<u8> = vec![];
         let bytes_downloaded = resp.copy_to(&mut buf)?;
         debug!("{} bytes downloaded", bytes_downloaded);
         Ok(buf)
     }
 
+    /// Download the archive from the network or load it from a file.
+    #[cfg(feature = "networking")]
+    fn load(&self) -> Result<Vec<u8>, TealdeerError> {
+        match self.source {
+            Source::File(ref path) => Self::load_from_file(path),
+            Source::Url(ref url) => Self::load_from_network(url),
+        }
+    }
+
+    /// Load the archive from the file system.
+    #[cfg(not(feature = "networking"))]
+    fn load(&self) -> Result<Vec<u8>, TealdeerError> {
+        match self.source {
+            Source::File(ref path) => Self::load_from_file(path),
+            Source::None => Err(TealdeerError::UpdateError("No update source defined".into())),
+        }
+    }
+
     /// Decompress and open the archive
     fn decompress<R: Read>(&self, reader: R) -> Archive<GzDecoder<R>> {
         Archive::new(GzDecoder::new(reader))
@@ -88,8 +139,8 @@ impl Cache {
 
     /// Update the pages cache.
     pub fn update(&self) -> Result<(), TealdeerError> {
-        // First, download the compressed data
-        let bytes: Vec<u8> = self.download()?;
+        // First, load the compressed data
+        let bytes: Vec<u8> = self.load()?;
 
         // Decompress the response body into an `Archive`
         let mut archive = self.decompress(&bytes[..]);
@@ -118,7 +169,7 @@ impl Cache {
         Ok(())
     }
 
-    #[cfg(unix)]
+    #[cfg(all(unix, feature = "networking"))]
     /// Return the number of seconds since the cache directory was last modified.
     pub fn last_update(&self) -> Option<i64> {
         if let Ok(cache_dir) = self.get_cache_dir() {
diff --git a/src/error.rs b/src/error.rs
index 60e0756..c2d1a32 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -1,4 +1,6 @@
 use std::fmt;
+
+#[cfg(feature = "networking")]
 use reqwest::Error as ReqwestError;
 
 #[derive(Debug)]
@@ -9,6 +11,7 @@ pub enum TealdeerError {
     UpdateError(String),
 }
 
+#[cfg(feature = "networking")]
 impl From<ReqwestError> for TealdeerError {
     fn from(err: ReqwestError) -> Self {
         TealdeerError::UpdateError(format!("HTTP error: {}", err.to_string()))
diff --git a/src/main.rs b/src/main.rs
index 06c3f72..459aa3b 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -16,11 +16,14 @@
 #[cfg(feature = "logging")]
 extern crate env_logger;
 
+#[cfg(feature = "networking")]
+use std::borrow::Cow;
 use std::fs::File;
 use std::io::BufReader;
 use std::path::{Path, PathBuf};
 use std::process;
 
+#[cfg(feature = "networking")]
 use ansi_term::Color;
 use docopt::Docopt;
 use serde_derive::Deserialize;
@@ -32,7 +35,7 @@ mod formatter;
 mod tokenizer;
 mod types;
 
-use crate::cache::Cache;
+use crate::cache::{Cache, Source};
 use crate::config::{get_config_path, make_default_config, Config};
 use crate::error::TealdeerError::{CacheError, ConfigError, UpdateError};
 use crate::formatter::print_lines;
@@ -42,6 +45,8 @@ use crate::types::OsType;
 const NAME: &str = "tealdeer";
 const VERSION: &str = env!("CARGO_PKG_VERSION");
 const USAGE: &str = "
+tealdeer, a fast tldr implementation written in Rust.
+
 Usage:
 
     tldr [options] <command>
@@ -49,16 +54,17 @@ Usage:
 
 Options:
 
-    -h --help           Show this screen
-    -v --version        Show version information
-    -l --list           List all commands in the cache
-    -f --render <file>  Render a specific markdown file
-    -o --os <type>      Override the operating system [linux, osx, sunos]
-    -u --update         Update the local cache
-    -c --clear-cache    Clear the local cache
-    -q --quiet          Suppress informational messages
-    --config-path       Show config file path
-    --seed-config       Create a basic config
+    -h --help               Show this screen
+    -v --version            Show version information
+    -l --list               List all commands in the cache
+    -f --render <file>      Render a specific markdown file
+    -o --os <type>          Override the operating system [linux, osx, sunos]
+    -u --update             Update the local cache from the network
+    -U --update-from <src>  Update the local cache from the specified URL or path
+    -c --clear-cache        Clear the local cache
+    -q --quiet              Suppress informational messages
+    --config-path           Show config file path
+    --seed-config           Create a basic config
 
 Examples:
 
@@ -70,11 +76,19 @@ To control the cache:
     $ tldr --update
     $ tldr --clear-cache
 
+You can also manually specify the archive to be used for updating the cache:
+
+    $ tldr --update-from https://github.com/tldr-pages/tldr/archive/master.tar.gz
+    $ tldr --update-from master.tar.gz
+
 To render a local file (for testing):
 
     $ tldr --render /path/to/file.md
 ";
+
+#[cfg(feature = "networking")]
 const ARCHIVE_URL: &str = "https://github.com/tldr-pages/tldr/archive/master.tar.gz";
+#[cfg(feature = "networking")]
 const MAX_CACHE_AGE: i64 = 2_592_000; // 30 days
 
 #[derive(Debug, Deserialize)]
@@ -86,6 +100,7 @@ struct Args {
     flag_render: Option<String>,
     flag_os: Option<OsType>,
     flag_update: bool,
+    flag_update_from: Option<String>,
     flag_clear_cache: bool,
     flag_quiet: bool,
     flag_config_path: bool,
@@ -119,6 +134,7 @@ fn print_page(path: &Path) -> Result<(), String> {
 }
 
 /// Check the cache for freshness
+#[cfg(feature = "networking")]
 fn check_cache(args: &Args, cache: &Cache) {
     if !args.flag_update {
         match cache.last_update() {
@@ -144,6 +160,14 @@ fn check_cache(args: &Args, cache: &Cache) {
     };
 }
 
+/// Check the cache for freshness
+///
+/// No-op when networking support is disabled.
+#[cfg(not(feature = "networking"))]
+fn check_cache(_args: &Args, _cache: &Cache) {
+    // No-op when no networking support is enabled.
+}
+
 #[cfg(feature = "logging")]
 fn init_log() {
     env_logger::init();
@@ -176,6 +200,28 @@ fn get_os() -> OsType {
     OsType::Other
 }
 
+#[cfg(feature = "networking")]
+fn get_url_source(source: &str) -> Source {
+    Source::Url(Cow::Owned(source.to_string()))
+}
+
+#[cfg(not(feature = "networking"))]
+fn get_url_source(_source: &str) -> Source {
+    eprintln!("tealdeer has been compiled without networking support,");
+    eprintln!("cannot update the cache from a network URL.");
+    process::exit(1);
+}
+
+#[cfg(feature = "networking")]
+fn get_default_source() -> Source {
+    Source::Url(Cow::Borrowed(ARCHIVE_URL))
+}
+
+#[cfg(not(feature = "networking"))]
+fn get_default_source() -> Source {
+    Source::None
+}
+
 fn main() {
     // Initialize logger
     init_log();
@@ -198,8 +244,15 @@ fn main() {
         None => get_os(),
     };
 
+    // Validate cache source
+    let cache_source: Source = match args.flag_update_from {
+        Some(ref src) if src.starts_with("http") => get_url_source(src),
+        Some(ref src) => Source::File(PathBuf::from(src)),
+        None => get_default_source(),
+    };
+
     // Initialize cache
-    let cache = Cache::new(ARCHIVE_URL, os);
+    let cache = Cache::new(cache_source, os);
 
     // Clear cache, pass through
     if args.flag_clear_cache {
@@ -217,7 +270,7 @@ fn main() {
     }
 
     // Update cache, pass through
-    if args.flag_update {
+    if args.flag_update || args.flag_update_from.is_some() {
         cache.update().unwrap_or_else(|e| {
             match e {
                 CacheError(msg) | ConfigError(msg) | UpdateError(msg) => {
diff --git a/tests/lib.rs b/tests/lib.rs
index 204c3fb..91e80b5 100644
--- a/tests/lib.rs
+++ b/tests/lib.rs
@@ -1,11 +1,5 @@
 //! Integration tests.
 
-extern crate assert_cmd;
-extern crate escargot;
-extern crate predicates;
-extern crate tempdir;
-extern crate utime;
-
 use std::fs::File;
 use std::io::Write;
 use std::process::Command;
@@ -20,7 +14,6 @@ struct TestEnv {
     pub config_dir: TempDir,
     pub input_dir: TempDir,
     pub default_features: bool,
-    pub features: Vec<String>,
 }
 
 impl TestEnv {
@@ -30,7 +23,6 @@ impl TestEnv {
             config_dir: TempDir::new(".tldr.test.config").unwrap(),
             input_dir: TempDir::new(".tldr.test.input").unwrap(),
             default_features: true,
-            features: vec![],
         }
     }
 
@@ -40,12 +32,6 @@ impl TestEnv {
         self
     }
 
-    /// Add the specified feature.
-    fn with_feature<S: Into<String>>(mut self, feature: S) -> Self {
-        self.features.push(feature.into());
-        self
-    }
-
     /// Return a new `Command` with env vars set.
     fn command(&self) -> Command {
         let mut build = escargot::CargoBuild::new()
@@ -53,10 +39,9 @@ impl TestEnv {
             .current_release()
             .current_target();
         if !self.default_features {
-            build = build.arg("--no-default-features");
-        }
-        if !self.features.is_empty() {
-            build = build.arg(&format!("--feature {}", self.features.join(",")));
+            build = build
+                .arg("--no-default-features")
+                .target_dir("target/no-default-features");
         }
         let run = build.run().unwrap();
         let mut cmd = run.command();
@@ -257,3 +242,57 @@ fn test_correct_rendering_with_config() {
         .success()
         .stdout(similar(expected));
 }
+
+/// Updating from a network URL should not be possible when networking support
+/// is not enabled.
+#[test]
+fn test_update_from_no_networking() {
+    let testenv = TestEnv::new();
+    testenv
+        .no_default_features()  // Disable networking
+        .command()
+        .args(&["--update-from", "https://github.com/tldr-pages/tldr/archive/master.tar.gz"])
+        .assert()
+        .failure()
+        .stderr(contains("compiled without networking support"))
+        .stderr(contains("cannot update the cache from a network URL"));
+}
+
+/// Updating from an invalid URL should result in an error message.
+#[test]
+fn test_update_from_invalid_url() {
+    let testenv = TestEnv::new();
+    testenv
+        .command()
+        .args(&["--update-from", "httpsss:github.com/tldr-pages/tldr/archive/master.tar.gz"])
+        .assert()
+        .failure()
+        .stderr(contains("Could not update cache: HTTP error"))
+        .stderr(contains("URL scheme is not allowed"));
+}
+
+/// Updating from the wrong (non-gzip-archive) URL should result in an error.
+#[test]
+fn test_update_from_wrong_url() {
+    let testenv = TestEnv::new();
+    testenv
+        .command()
+        .args(&["--update-from", "https://tldr.sh/"])
+        .assert()
+        .failure()
+        .stderr(contains("Could not update cache: Could not unpack compressed data"));
+}
+
+/// When a path is specified that does not exist, an error message should be shown.
+#[test]
+fn test_update_from_missing_path() {
+    let testenv = TestEnv::new();
+    testenv
+        .no_default_features()
+        .command()
+        .args(&["--update-from", "ajsdfasjdkfljasdf"])  // Invalid path
+        .assert()
+        .failure()
+        .stderr(contains("Could not update cache: Could not open file:"))
+        .stderr(contains("No such file or directory"));
+}