diff: handle relative paths in no-index

When diff-no-index is given a relative path to a file outside the
repository, it aborts with error. However, if the file is given
using an absolute path, the diff runs as expected. The two cases
should be treated the same.

Tests and commit message by Tim Henigan.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Tim Henigan <tim.henigan@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/cache.h b/cache.h
index 84b82297484df95c6908c5d4571d63f9f04e601f..8e691957e9e0cfce5a17a02c8bdd25d51773bcff 100644 (file)
--- a/cache.h
+++ b/cache.h
@@ -455,6 +455,7 @@ extern const char *prefix_filename(const char *prefix, int len, const char *path
 extern int check_filename(const char *prefix, const char *name);
 extern void verify_filename(const char *prefix, const char *name);
 extern void verify_non_filename(const char *prefix, const char *name);
+extern int path_inside_repo(const char *prefix, const char *path);
 
 #define INIT_DB_QUIET 0x0001
 

diff --git a/diff-no-index.c b/diff-no-index.c
index f0b0010aedd67f9b34f43426c47e837dfe2a522b..e6b9952b34181141e052a00266d761cd5ce86f58 100644 (file)
--- a/diff-no-index.c
+++ b/diff-no-index.c
@@ -151,23 +151,6 @@ static int queue_diff(struct diff_options *o,
        }
 }
 
-static int path_outside_repo(const char *path)
-{
-       const char *work_tree;
-       size_t len;
-
-       if (!is_absolute_path(path))
-               return 0;
-       work_tree = get_git_work_tree();
-       if (!work_tree)
-               return 1;
-       len = strlen(work_tree);
-       if (strncmp(path, work_tree, len) ||
-           (path[len] != '\0' && path[len] != '/'))
-               return 1;
-       return 0;
-}
-
 void diff_no_index(struct rev_info *revs,
                   int argc, const char **argv,
                   int nongit, const char *prefix)
@@ -197,8 +180,8 @@ void diff_no_index(struct rev_info *revs,
                 * a colourful "diff" replacement.
                 */
                if ((argc != i + 2) ||
-                   (!path_outside_repo(argv[i]) &&
-                    !path_outside_repo(argv[i+1])))
+                   (path_inside_repo(prefix, argv[i]) &&
+                    path_inside_repo(prefix, argv[i+1])))
                        return;
        }
        if (argc != i + 2)

diff --git a/setup.c b/setup.c
index 731851a4a85161af49a38c481672615a6ac0bbc9..2cfa0377729bb0c90345a17e6cef4432626b6675 100644 (file)
--- a/setup.c
+++ b/setup.c
@@ -4,7 +4,7 @@
 static int inside_git_dir = -1;
 static int inside_work_tree = -1;
 
-char *prefix_path(const char *prefix, int len, const char *path)
+static char *prefix_path_gently(const char *prefix, int len, const char *path)
 {
        const char *orig = path;
        char *sanitized;
@@ -31,7 +31,8 @@ char *prefix_path(const char *prefix, int len, const char *path)
                if (strncmp(sanitized, work_tree, len) ||
                    (len > root_len && sanitized[len] != '\0' && sanitized[len] != '/')) {
                error_out:
-                       die("'%s' is outside repository", orig);
+                       free(sanitized);
+                       return NULL;
                }
                if (sanitized[len] == '/')
                        len++;
@@ -40,6 +41,25 @@ char *prefix_path(const char *prefix, int len, const char *path)
        return sanitized;
 }
 
+char *prefix_path(const char *prefix, int len, const char *path)
+{
+       char *r = prefix_path_gently(prefix, len, path);
+       if (!r)
+               die("'%s' is outside repository", path);
+       return r;
+}
+
+int path_inside_repo(const char *prefix, const char *path)
+{
+       int len = prefix ? strlen(prefix) : 0;
+       char *r = prefix_path_gently(prefix, len, path);
+       if (r) {
+               free(r);
+               return 1;
+       }
+       return 0;
+}
+
 int check_filename(const char *prefix, const char *arg)
 {
        const char *name;

diff --git a/t/t4053-diff-no-index.sh b/t/t4053-diff-no-index.sh
index 4dc8c67edc683fd7fe492c7373226df74a0127bc..979e98398bebc21fe664ca4a19770e5b251bfc97 100755 (executable)
--- a/t/t4053-diff-no-index.sh
+++ b/t/t4053-diff-no-index.sh
@@ -8,7 +8,12 @@ test_expect_success 'setup' '
        mkdir a &&
        mkdir b &&
        echo 1 >a/1 &&
-       echo 2 >a/2
+       echo 2 >a/2 &&
+       git init repo &&
+       echo 1 >repo/a &&
+       mkdir -p non/git &&
+       echo 1 >non/git/a &&
+       echo 1 >non/git/b
 '
 
 test_expect_success 'git diff --no-index directories' '
@@ -16,4 +21,12 @@ test_expect_success 'git diff --no-index directories' '
        test $? = 1 && test_line_count = 14 cnt
 '
 
+test_expect_success 'git diff --no-index relative path outside repo' '
+       (
+               cd repo &&
+               test_expect_code 0 git diff --no-index a ../non/git/a &&
+               test_expect_code 0 git diff --no-index ../non/git/a ../non/git/b
+       )
+'
+
 test_done