git-gui: Support cloning Cygwin based work-dirs

If the user tries to clone a Git repository that is actually a
workdir of another repository (by way of contrib git-new-workdir)
then the contents of .git is a series of Windows .lnk files which
Tcl can't read if this is a native Tcl process.  To read the real
objects directory we need to resolve the link to that location.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

diff --git a/lib/choose_repository.tcl b/lib/choose_repository.tcl
index e66df85964cc68bb19c9e12763027d590817b4e3..bf04361464900ae216db57e35cd8c5e563fc0476 100644 (file)
--- a/lib/choose_repository.tcl
+++ b/lib/choose_repository.tcl
@@ -324,9 +324,42 @@ proc _is_git {path} {
         && [file exists [file join $path config]]} {
                return 1
        }
+       if {[is_Cygwin]} {
+               if {[file exists [file join $path HEAD]]
+                && [file exists [file join $path objects.lnk]]
+                && [file exists [file join $path config.lnk]]} {
+                       return 1
+               }
+       }
        return 0
 }
 
+proc _objdir {path} {
+       set objdir [file join $path .git objects]
+       if {[file isdirectory $objdir]} {
+               return $objdir
+       }
+
+       set objdir [file join $path objects]
+       if {[file isdirectory $objdir]} {
+               return $objdir
+       }
+
+       if {[is_Cygwin]} {
+               set objdir [file join $path .git objects.lnk]
+               if {[file isfile $objdir]} {
+                       return [win32_read_lnk $objdir]
+               }
+
+               set objdir [file join $path objects.lnk]
+               if {[file isfile $objdir]} {
+                       return [win32_read_lnk $objdir]
+               }
+       }
+
+       return {}
+}
+
 ######################################################################
 ##
 ## Create New Repository
@@ -555,13 +588,10 @@ method _do_clone2 {} {
        }
 
        if {$clone_type eq {hardlink} || $clone_type eq {shared}} {
-               set objdir [file join $origin_url .git objects]
-               if {![file isdirectory $objdir]} {
-                       set objdir [file join $origin_url objects]
-                       if {![file isdirectory $objdir]} {
-                               error_popup [mc "Not a Git repository: %s" [file tail $origin_url]]
-                               return
-                       }
+               set objdir [_objdir $origin_url]
+               if {$objdir eq {}} {
+                       error_popup [mc "Not a Git repository: %s" [file tail $origin_url]]
+                       return
                }
        }