clone: the given repository dir should be relative to $PWD

the repository argument for git-clone should be relative to $PWD
instead of the given target directory.  The old behavior gave us
surprising success and you need a few minute to know why it worked.

GIT_DIR is already exported so no need to cd into $D. And this makes
$PWD for git-fetch-pack, which is the actual command to take the given
repository dir, the same as git-clone.

Signed-off-by: Yasushi SHOJI <yashi@atmark-techno.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>

git-clone.sh

@@ -312,7 +312,7 @@ yes,yes)
 		fi
 		;;
 	*)
-		cd "$D" && case "$upload_pack" in
+		case "$upload_pack" in
 		'') git-fetch-pack --all -k $quiet "$repo" ;;
 		*) git-fetch-pack --all -k $quiet "$upload_pack" "$repo" ;;
 		esac >"$GIT_DIR/CLONE_HEAD" || {

t/t5600-clone-fail-cleanup.sh

@@ -25,6 +25,12 @@ test_create_repo foo
 # clone doesn't like it if there is no HEAD. Is that a bug?
 (cd foo && touch file && git add file && git commit -m 'add file' >/dev/null 2>&1)
 
+# source repository given to git-clone should be relative to the
+# current path not to the target dir
+test_expect_failure \
+    'clone of non-existent (relative to $PWD) source should fail' \
+    'git-clone ../foo baz'
+
 test_expect_success \
     'clone should work now that source exists' \
     'git-clone foo bar'