From 4240797f478007b661b80494ff89d56f30b11b65 Mon Sep 17 00:00:00 2001
From: Egor Tensin <Egor.Tensin@gmail.com>
Date: Mon, 4 Jan 2021 01:57:48 +0300
Subject: replace Fix-CygwinLink with a shorter bash script

---
 action.yml | 63 ++++++++++++++------------------------------------------------
 1 file changed, 14 insertions(+), 49 deletions(-)

diff --git a/action.yml b/action.yml
index 62d021a..a1f8d42 100644
--- a/action.yml
+++ b/action.yml
@@ -34,12 +34,7 @@ runs:
         New-Variable packages -Value '${{ inputs.packages }}' -Option Constant
         New-Variable symlinks_to_hardlinks -Value ('${{ inputs.symlinks-to-hardlinks }}' -eq '1') -Option Constant
 
-        New-Variable bin_dir -Value (Join-Path $install_dir bin) -Option Constant
-        New-Variable realpath -Value (Join-Path $bin_dir realpath.exe) -Option Constant
-        New-Variable readlink -Value (Join-Path $bin_dir readlink.exe) -Option Constant
-        New-Variable dirname -Value (Join-Path $bin_dir dirname.exe) -Option Constant
-        New-Variable cygpath -Value (Join-Path $bin_dir cygpath.exe) -Option Constant
-        New-Variable find -Value (Join-Path $bin_dir find.exe) -Option Constant
+        New-Variable bash -Value (Join-Path $install_dir bin bash.exe) -Option Constant
 
         function Locate-Choco {
             $path = Get-Command 'choco' -ErrorAction SilentlyContinue
@@ -50,48 +45,6 @@ runs:
             }
         }
 
-        function Convert-CygwinPath {
-            # Like cygpath -wa, but don't resolve symlinks.
-            param(
-                [Parameter(Mandatory=$true)]
-                [string] $Path
-            )
-
-            $realpath = & $script:realpath --no-symlinks -- $Path
-            $dirname = & $script:dirname -- $realpath
-            $dirname = & $script:cygpath -wa $dirname
-            Join-Path $dirname (Split-Path $realpath -Leaf)
-        }
-
-        function Fix-CygwinLink {
-            # Replace a Cygwin symlink with a hardlink.
-            param(
-                [Parameter(Mandatory=$true)]
-                [string] $Path
-            )
-
-            $link_path = $Path
-            $link_winpath = Convert-CygwinPath $link_path
-            $link_ext = [System.IO.Path]::GetExtension($link_path)
-
-            $dest_path = & $script:readlink --canonicalize-existing -- $link_path
-            $dest_winpath = Convert-CygwinPath $dest_path
-            $dest_ext = [System.IO.Path]::GetExtension($dest_path)
-
-            echo "Removing symlink: $link_winpath"
-            Remove-Item $link_winpath -Force
-
-            # If target is an executable (i.e. its name contains one of the
-            # PATHEXT extensions), make sure the hardlink has the same
-            # extension.
-            $exe_exts = $env:PATHEXT.ToLower().Split(';', [System.StringSplitOptions]::RemoveEmptyEntries)
-            if ($exe_exts -contains $dest_ext.ToLower() -and $dest_ext.ToLower() -ne $link_ext.ToLower()) {
-                $link_winpath += $dest_ext
-            }
-            echo "Creating hardlink '$link_winpath', pointing to '$dest_winpath'"
-            New-Item -ItemType HardLink -Path $link_winpath -Value $dest_winpath | Out-Null
-        }
-
         if ($windows_host) {
             echo 'CYGWIN=${{ inputs.env }}' >> $env:GITHUB_ENV
 
@@ -122,7 +75,19 @@ runs:
             }
 
             if ($symlinks_to_hardlinks) {
-                & $find /usr/bin -type l | %{ Fix-CygwinLink $_ }
+                echo @'
+        while IFS= read -d '' -r link_path; do
+            dest_path="$( readlink --canonicalize-existing -- "$link_path" )"
+            dest_ext=".${dest_path##*.}"
+            [ "$dest_ext" == ".$dest_path" ] && dest_ext=
+            link_ext=".${link_path##*.}"
+            [ "$link_ext" == ".$link_path" ] && link_ext=
+            echo "Removing symlink $link_path" && rm -f -- "$link_path"
+            [ "$link_ext" != "$dest_ext" ] && echo "${PATHEXT//\;/
+        }" | grep -q --ignore-case --line-regexp -F -- "$dest_ext" && link_path="$link_path$dest_ext"
+            echo "Creating hardlink $link_path -> $dest_path" && ln -- "$dest_path" "$link_path"
+        done < <( find /usr/bin -type l -print0 )
+        '@ | & $bash --login -o errexit -o nounset -o pipefail -o igncr
             }
         } else {
             throw "Sorry, installing Cygwin is unsupported on $os"
-- 
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