fix: warn when Git target exists but is not a valid git repository (#86)

CHANGELOG.md

@@ -7,6 +7,19 @@
 
 ## [Unreleased]
 
+### Fixed
+
+- `Git` handler no longer silently ignores a pre-existing directory at
+  the clone target that is not a valid git repository; it now emits a
+  `Write-Warning` so the user knows why the install was skipped (#86).
+
+### Tests
+
+- Added idempotency test: a second install run against an already-cloned
+  repo does not trigger a second `git clone` (#86).
+- Added non-git-directory test: confirms a warning is emitted and no
+  clone is attempted when the target path exists but is not a git repo (#86).
+
 ## [0.4.1] - 2026-06-12
 
 ### Added
@@ -127,7 +140,7 @@
 ### Fixed
 
 - `Get-Dependency` operator-precedence bug when `DependencyType` is
   set inside `PSDependOptions`: parenthesization was incorrect, so the
   global default failed to apply to dependencies without an explicit
   type (#131, #173).
 - `Find-PSDependLocally` now consults *all* installed versions of a
@@ -138,7 +151,7 @@
   passing it to `Import-Module`, preventing failures when prerelease
   segments or `vX.Y.Z` tags appear in the resolved version (#140).
 - `Chocolatey` install path now passes `--yes` to `choco install`
   (previously the script contained the typo `--yess`), so installs
   no longer hang waiting on confirmation, and the surrounding code
   was tidied for readability (#174).
 - `Git` handler now uses the full `Dependency.Target` path when the

PSDepend/PSDependScripts/Git.ps1

@@ -31,7 +31,7 @@
 
     .EXAMPLE
         @{
             'buildhelpers' = @{
                 Name = 'https://github.com/RamblingCookieMonster/BuildHelpers.git'
                 Version = 'd32a9495c39046c851ceccfb7b1a85b17d5be051'
                 Target = 'C:\git'
@@ -39,7 +39,7 @@
         }
 
         # Full syntax
           # DependencyName (key) uses (unique) name 'buildhelpers'
           # Override DependencyName as URL the name https://github.com/RamblingCookieMonster/BuildHelpers.git
           # Specify a commit to checkout (version)
           # Clone in C:\git
@@ -52,15 +52,15 @@
         }
 
         # Simple syntax
           # First example shows cloning PSDeploy from ramblingcookiemonster's GitHub repo
           # Second example shows clonging BuildHelpers from jdoe's internal GitLab account and checking out a specific commit
           # Both are cloned to the current path (e.g. .\<repo name>)
           # This syntax assumes git as a source. The right hand side is the version (branch, commit, tags/<tag name>, etc.)
 #>
 [cmdletbinding()]
 param(
     [PSTypeName('PSDepend.Dependency')]
     [psobject[]]$Dependency,
 
     [switch]$Force,
 
@@ -84,7 +84,7 @@
 if ($Name -match "^[a-zA-Z0-9]+/[a-zA-Z0-9_-]+$") {
     $Name = "https://github.com/$Name.git"
 }
 $GitName = $Name.trimend('/').split('/')[-1] -replace "\.git$", ''
 if ($Dependency.Target -and ($Target = (Get-Item $Dependency.Target -ErrorAction SilentlyContinue).FullName)) {
     Write-Debug "Target resolved to $Target"
 }
@@ -132,7 +132,11 @@
     $Branch = Invoke-ExternalCommand git -Arguments (Write-Output rev-parse --abbrev-ref HEAD) -Passthru
     $Commit = Invoke-ExternalCommand git -Arguments (Write-Output rev-parse HEAD) -Passthru
     Pop-Location
-    if ($Version -eq $Branch -or $Version -eq $Commit) {
+    if (-not $Branch) {
+        Write-Warning "[$RepoPath] exists but does not appear to be a valid git repository. Skipping [$DependencyName]."
+        $GottaInstall = $False
+    }
+    elseif ($Version -eq $Branch -or $Version -eq $Commit) {
         Write-Verbose "[$RepoPath] exists and is already at version [$Version]"
         if ($PSDependAction -contains 'Test' -and $PSDependAction.count -eq 1) {
             return $true

Tests/Git.Type.Tests.ps1

@@ -74,4 +74,39 @@ Describe 'Git script' {
         $result | Should -Be $false
         Should -Invoke -CommandName Invoke-ExternalCommand -ModuleName PSDepend -Times 0
     }
+
+    It 'Does not clone again when repo already exists at the correct version (idempotency)' {
+        $targetDir = (New-Item 'TestDrive:/git-idempotent' -ItemType Directory -Force).FullName
+        # Pre-create the repo directory as if a prior run cloned it
+        $null = New-Item (Join-Path $targetDir 'repo') -ItemType Directory -Force
+        $dep = New-PSDependFixture -DependencyName 'https://example.com/user/repo.git' -DependencyType 'Git' -Version 'main' -Target $targetDir
+
+        InModuleScope PSDepend -Parameters @{ Dep = $dep; ScriptPath = $script:ScriptPath } {
+            # rev-parse returns the branch name matching Version
+            Mock Invoke-ExternalCommand {
+                if ($Arguments -contains '--abbrev-ref') { return 'main' }
+                if ($Arguments -notcontains 'clone' -and $Arguments -notcontains '--abbrev-ref') { return 'abc1234' }
+            }
+            & $ScriptPath -Dependency $Dep
+        }
+        Should -Invoke -CommandName Invoke-ExternalCommand -ModuleName PSDepend -Times 0 -ParameterFilter {
+            $Arguments -contains 'clone'
+        }
+    }
+
+    It 'Emits a warning and skips install when the repo path exists but is not a git repository' {
+        $targetDir = (New-Item 'TestDrive:/git-nongit' -ItemType Directory -Force).FullName
+        # Pre-create the directory but leave it empty (not a git repo)
+        $null = New-Item (Join-Path $targetDir 'repo') -ItemType Directory -Force
+        $dep = New-PSDependFixture -DependencyName 'https://example.com/user/repo.git' -DependencyType 'Git' -Version 'main' -Target $targetDir
+
+        InModuleScope PSDepend -Parameters @{ Dep = $dep; ScriptPath = $script:ScriptPath } {
+            # rev-parse returns nothing (non-git directory)
+            Mock Invoke-ExternalCommand { }
+            { & $ScriptPath -Dependency $Dep } | Should -Not -Throw
+        }
+        Should -Invoke -CommandName Invoke-ExternalCommand -ModuleName PSDepend -Times 0 -ParameterFilter {
+            $Arguments -contains 'clone'
+        }
+    }
 }