[PATCH] git-mv: succeed even if source is a prefix of destination

[Johannes Schindelin <Johannes.Schindelin@gmx.de>]

As noted by Fredrik Kuivinen, without this patch, git-mv fails on

	git-mv README README-renamed

because "README" is a prefix of "README-renamed".

Signed-off-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>

---

	On Tue, 15 Aug 2006, David Rientjes wrote:

	> On Tue, 15 Aug 2006, Fredrik Kuivinen wrote:
	> > With the current master I get the following:
	> > 
	> >     $ git-mv README README-renamed
	> >     fatal: can not move directory into itself, source=README, destination=README-renamed
	> > 
	> 
	> Please try the following patch.
	> 
	> -		if (!bad &&
	> -		    !strncmp(destination[i], source[i], strlen(source[i])))
	> +		if (!bad && !strcmp(destination[i], source[i]))

	This is not sufficient. It will not catch something like

		git-mv some/path some/path/and/some/more/


 builtin-mv.c  |    5 ++++-
 t/t7001-mv.sh |    4 ++++
 2 files changed, 8 insertions(+), 1 deletions(-)

diff --git a/builtin-mv.c b/builtin-mv.c
index a731f8d..e7b5eb7 100644
--- a/builtin-mv.c
+++ b/builtin-mv.c
@@ -119,6 +119,7 @@ int cmd_mv(int argc, const char **argv, 
 
 	/* Checking */
 	for (i = 0; i < count; i++) {
+		int length;
 		const char *bad = NULL;
 
 		if (show_only)
@@ -204,7 +205,9 @@ int cmd_mv(int argc, const char **argv, 
 		}
 
 		if (!bad &&
-		    !strncmp(destination[i], source[i], strlen(source[i])))
+		    (length = strlen(source[i])) >= 0 &&
+		    !strncmp(destination[i], source[i], length) &&
+		    (destination[i][length] == 0 || destination[i][length] == '/'))
 			bad = "can not move directory into itself";
 
 		if (!bad && cache_name_pos(source[i], strlen(source[i])) < 0)
diff --git a/t/t7001-mv.sh b/t/t7001-mv.sh
index 900ca93..e5e0bb9 100755
--- a/t/t7001-mv.sh
+++ b/t/t7001-mv.sh
@@ -60,6 +60,10 @@ test_expect_success \
      grep -E "^R100.+path0/README.+path2/README"'
 
 test_expect_success \
+    'succeed when source is a prefix of destination' \
+    'git-mv path2/COPYING path2/COPYING-renamed'
+
+test_expect_success \
     'moving whole subdirectory into subdirectory' \
     'git-mv path2 path1'
 
-- 
1.4.2.g2e3b