[PATCH v2 tested-v2] git-sh-setup: Fix scripts whose PWD is a symlink to a work-dir on OS X

["Marcel M. Cary" <marcel@oak.homeunix.org>]

On Mac OS X and possibly BSDs, /bin/pwd reads PWD from the environment
if available and shows the logical path by default rather than the
physical one.

Unset PWD before running /bin/pwd in both cd_to_toplevel and its
test.

Still use the external /bin/pwd because in my Bash on Linux,
the builtin pwd prints the same result whether or not PWD is set.

Signed-off-by: Marcel M. Cary <marcel@oak.homeunix.org>
Tested-by: Marcel Koeppen <git-dev@marzelpan.de> (on Mac OS X 10.5.6)
---

> please add
> 
> Tested-by: Marcel Koeppen <git-dev@marzelpan.de> (on Mac OS X 10.5.6)

Now with the OS, in detail.


 git-sh-setup.sh           |    2 +-
 t/t2300-cd-to-toplevel.sh |    4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/git-sh-setup.sh b/git-sh-setup.sh
index f07d96b..2142308 100755
--- a/git-sh-setup.sh
+++ b/git-sh-setup.sh
@@ -96,7 +96,7 @@ cd_to_toplevel () {
 		..|../*|*/..|*/../*)
 			# Interpret $cdup relative to the physical, not logical, cwd.
 			# Probably /bin/pwd is more portable than passing -P to cd or pwd.
-			phys="$(/bin/pwd)/$cdup"
+			phys="$(unset PWD; /bin/pwd)/$cdup"
 			;;
 		*)
 			# There's no "..", so no need to make things absolute.
diff --git a/t/t2300-cd-to-toplevel.sh b/t/t2300-cd-to-toplevel.sh
index beddb4e..e42cbfe 100755
--- a/t/t2300-cd-to-toplevel.sh
+++ b/t/t2300-cd-to-toplevel.sh
@@ -10,12 +10,12 @@ test_cd_to_toplevel () {
 			cd '"'$1'"' &&
 			. git-sh-setup &&
 			cd_to_toplevel &&
-			[ "$(/bin/pwd)" = "$TOPLEVEL" ]
+			[ "$(unset PWD; /bin/pwd)" = "$TOPLEVEL" ]
 		)
 	'
 }
 
-TOPLEVEL="$(/bin/pwd)/repo"
+TOPLEVEL="$(unset PWD; /bin/pwd)/repo"
 mkdir -p repo/sub/dir
 mv .git repo/
 SUBDIRECTORY_OK=1
-- 
1.6.1