[PATCH] get_cwd_relative(): do not misinterpret suffix as subdirectory

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If the current working directory is the same as the work tree path
plus a suffix, e.g. 'work' and 'work-xyz', then the suffix '-xyz'
would be interpreted as a subdirectory of 'work'.

Signed-off-by: Clemens Buchacher <drizzd@xxxxxx>
---

Hi Junio,

I am not sure if the tests are really worth it. I do not mind you drop them.

Regards,
Clemens

 dir.c               |    9 +++++++--
 t/t1501-worktree.sh |   12 ++++++++++--
 2 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/dir.c b/dir.c
index cb83332..5615f33 100644
--- a/dir.c
+++ b/dir.c
@@ -958,9 +958,14 @@ char *get_relative_cwd(char *buffer, int size, const char *dir)
 	}
 	if (*dir)
 		return NULL;
-	if (*cwd == '/')
+	switch (*cwd) {
+	case '\0':
+		return cwd;
+	case '/':
 		return cwd + 1;
-	return cwd;
+	default:
+		return NULL;
+	}
 }
 
 int is_inside_dir(const char *dir)
diff --git a/t/t1501-worktree.sh b/t/t1501-worktree.sh
index 9df3012..bd8b607 100755
--- a/t/t1501-worktree.sh
+++ b/t/t1501-worktree.sh
@@ -30,6 +30,7 @@ test_rev_parse() {
 
 EMPTY_TREE=$(git write-tree)
 mkdir -p work/sub/dir || exit 1
+mkdir -p work2 || exit 1
 mv .git repo.git || exit 1
 
 say "core.worktree = relative path"
@@ -54,7 +55,9 @@ GIT_DIR=$(pwd)/repo.git
 GIT_CONFIG=$GIT_DIR/config
 git config core.worktree "$(pwd)/work"
 test_rev_parse 'outside'      false false false
-cd work || exit 1
+cd work2
+test_rev_parse 'outside2'     false false false
+cd ../work || exit 1
 test_rev_parse 'inside'       false false true ''
 cd sub/dir || exit 1
 test_rev_parse 'subdirectory' false false true sub/dir/
@@ -67,7 +70,9 @@ git config core.worktree non-existent
 GIT_WORK_TREE=work
 export GIT_WORK_TREE
 test_rev_parse 'outside'      false false false
-cd work || exit 1
+cd work2
+test_rev_parse 'outside'      false false false
+cd ../work || exit 1
 GIT_WORK_TREE=.
 test_rev_parse 'inside'       false false true ''
 cd sub/dir || exit 1
@@ -76,6 +81,7 @@ test_rev_parse 'subdirectory' false false true sub/dir/
 cd ../../.. || exit 1
 
 mv work repo.git/work
+mv work2 repo.git/work2
 
 say "GIT_WORK_TREE=absolute path, work tree below git dir"
 GIT_DIR=$(pwd)/repo.git
@@ -86,6 +92,8 @@ cd repo.git || exit 1
 test_rev_parse 'in repo.git'              false true  false
 cd objects || exit 1
 test_rev_parse 'in repo.git/objects'      false true  false
+cd ../work2 || exit 1
+test_rev_parse 'in repo.git/work2'      false true  false
 cd ../work || exit 1
 test_rev_parse 'in repo.git/work'         false true true ''
 cd sub/dir || exit 1
-- 
1.7.0.5.3.ga76e

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