[PATCH v3 4/4] submodules: fix ambiguous absolute paths under Windows

[Jens Lehmann <Jens.Lehmann@web.de>]

From: Johannes Sixt <j6t@kdbg.org>

Under Windows the "git rev-parse --git-dir" and "pwd" commands may return
either drive-letter-colon or POSIX style paths. This makes module_clone()
behave badly because it expects absolute paths to always start with a '/'.

Fix that by always converting the "c:/" notation into "/c/" when computing
the relative paths from gitdir to the submodule work tree and back.

Signed-off-by: Johannes Sixt <j6t@kdbg.org>
---
 git-submodule.sh |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/git-submodule.sh b/git-submodule.sh
index a9e9822..efc86ad 100755
--- a/git-submodule.sh
+++ b/git-submodule.sh
@@ -151,6 +151,9 @@ module_clone()

 	a=$(cd "$gitdir" && pwd)/
 	b=$(cd "$path" && pwd)/
+	# normalize Windows-style absolute paths to POSIX-style absolute paths
+	case $a in [a-zA-Z]:/*) a=/${a%%:*}${a#*:} ;; esac
+	case $b in [a-zA-Z]:/*) b=/${b%%:*}${b#*:} ;; esac
 	# Remove all common leading directories after a sanity check
 	if test "${a#$b}" != "$a" || test "${b#$a}" != "$b"; then
 		die "$(eval_gettext "Gitdir '\$a' is part of the submodule path '\$b' or vice versa")"
-- 
1.7.9.2.362.g684a8