Installer: report the installed Unsloth version (#7265)

* Installer: report the installed Unsloth version

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

install.ps1

@@ -2420,6 +2420,13 @@ exit 0
         }
     }
 
+    $installedPackageVersion = (& $VenvPython -c "from importlib.metadata import version; import sys; print(version(sys.argv[1]))" $PackageName 2>$null | Out-String).Trim()
+    if ($LASTEXITCODE -eq 0 -and $installedPackageVersion) {
+        step $PackageName "$installedPackageVersion installed"
+    } else {
+        substep "[WARN] installed $PackageName version could not be determined" "Yellow"
+    }
+
     # ── Enforce the installed torch flavor matches the detected GPU build ──
     # PEP 440 ignores the +cpu/+cuXXX/+rocm local label in a version range, so uv
     # keeps a stale torch==X+cpu against a CUDA index and setup.ps1 then loops on

install.sh

@@ -3396,6 +3396,15 @@ else
     fi
 fi
 
+_installed_package_version=$("$_VENV_PY" -c \
+    'from importlib.metadata import version; import sys; print(version(sys.argv[1]))' \
+    "$PACKAGE_NAME" 2>/dev/null || true)
+if [ -n "$_installed_package_version" ]; then
+    step "$PACKAGE_NAME" "$_installed_package_version installed"
+else
+    substep "[WARN] installed $PACKAGE_NAME version could not be determined" "$C_WARN"
+fi
+
 # ── Enforce the installed torch flavor matches the detected GPU build ──
 # PEP 440 ignores the +cpu/+cuXXX/+rocm local label in a version range, so uv
 # keeps a stale torch==X+cpu against a GPU index and the venv silently trains on

tests/test_installer_unsloth_version.py

@@ -0,0 +1,75 @@
+"""Regression coverage for installer version reporting."""
+
+from __future__ import annotations
+
+import re
+import shutil
+import subprocess
+import sys
+from importlib.metadata import version
+from pathlib import Path
+
+import pytest
+
+REPO_ROOT = Path(__file__).resolve().parents[1]
+INSTALL_SH = REPO_ROOT / "install.sh"
+INSTALL_PS1 = REPO_ROOT / "install.ps1"
+
+
+def _extract(pattern: str, source: str) -> str:
+    match = re.search(pattern, source, flags = re.DOTALL | re.MULTILINE)
+    assert match is not None, f"installer block not found: {pattern}"
+    return match.group(0)
+
+
+@pytest.mark.skipif(shutil.which("sh") is None, reason = "POSIX shell is unavailable")
+def test_posix_installer_reports_installed_distribution_version():
+    source = INSTALL_SH.read_text(encoding = "utf-8")
+    reporter = _extract(
+        r"_installed_package_version=\$\(.*?^fi",
+        source,
+    )
+    result = subprocess.run(
+        [
+            "sh",
+            "-c",
+            (
+                'step() { printf "%s %s\\n" "$1" "$2"; }\n'
+                'substep() { printf "WARN %s\\n" "$1"; }\n'
+                f"_VENV_PY={sys.executable!r}\n"
+                "PACKAGE_NAME=pytest\n"
+                f"{reporter}"
+            ),
+        ],
+        check = True,
+        capture_output = True,
+        text = True,
+    )
+    assert result.stdout.strip() == f"pytest {version('pytest')} installed"
+
+
+@pytest.mark.skipif(shutil.which("pwsh") is None, reason = "PowerShell is unavailable")
+def test_windows_version_reporter_uses_distribution_metadata():
+    source = INSTALL_PS1.read_text(encoding = "utf-8")
+    reporter = _extract(
+        r"    \$installedPackageVersion = .*?^    if .*?^    \} else \{.*?^    \}",
+        source,
+    )
+    result = subprocess.run(
+        [
+            "pwsh",
+            "-NoProfile",
+            "-NonInteractive",
+            "-Command",
+            (
+                'function step { param($Label, $Value) Write-Output "$Label $Value" }; '
+                'function substep { param($Message, $Color) Write-Output "WARN $Message" }; '
+                f"$VenvPython = '{sys.executable}'; $PackageName = 'pytest'; "
+                f"{reporter}"
+            ),
+        ],
+        check = True,
+        capture_output = True,
+        text = True,
+    )
+    assert result.stdout.strip() == f"pytest {version('pytest')} installed"