builtin-apply.c: Skip filenames without enough components

find_name() wrongly returned the whole filename for filenames without
enough leading pathname components (e.g., when applying a patch to a
top-level file with -p2).

Include the -p value used in the error message when no filenames can be
found.

[jc: squashed a test from Nanako Shiraishi]

Signed-off-by: Andreas Gruenbacher <agruen@suse.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin-apply.c b/builtin-apply.c
index 36e2f9dda5c85c346e31f45afa6d28b107679970..218363fe04bafa70ac205542c94ddc9002aec48e 100644 (file)
--- a/builtin-apply.c
+++ b/builtin-apply.c
@@ -404,6 +404,9 @@ static char *squash_slash(char *name)
 {
        int i = 0, j = 0;
 
+       if (!name)
+               return NULL;
+
        while (name[i]) {
                if ((name[j++] = name[i++]) == '/')
                        while (name[i] == '/')
@@ -416,7 +419,10 @@ static char *squash_slash(char *name)
 static char *find_name(const char *line, char *def, int p_value, int terminate)
 {
        int len;
-       const char *start = line;
+       const char *start = NULL;
+
+       if (p_value == 0)
+               start = line;
 
        if (*line == '"') {
                struct strbuf name = STRBUF_INIT;
@@ -1199,7 +1205,8 @@ static int find_header(char *line, unsigned long size, int *hdrsize, struct patc
                                continue;
                        if (!patch->old_name && !patch->new_name) {
                                if (!patch->def_name)
-                                       die("git diff header lacks filename information (line %d)", linenr);
+                                       die("git diff header lacks filename information when removing "
+                                           "%d leading pathname components (line %d)" , p_value, linenr);
                                patch->old_name = patch->new_name = patch->def_name;
                        }
                        patch->is_toplevel_relative = 1;

diff --git a/t/t4120-apply-popt.sh b/t/t4120-apply-popt.sh
index 83d4ba679850c2ae2548bcfcce3f22227fcde8c7..b463b4f05ce43ee345a0594528d684befe7c2ef3 100755 (executable)
--- a/t/t4120-apply-popt.sh
+++ b/t/t4120-apply-popt.sh
@@ -22,4 +22,9 @@ test_expect_success 'apply git diff with -p2' '
        git apply -p2 patch.file
 '
 
+test_expect_success 'apply with too large -p' '
+       test_must_fail git apply --stat -p3 patch.file 2>err &&
+       grep "removing 3 leading" err
+'
+
 test_done