git-diff/git-apply: make diff output a bit friendlier to GNU patch (part 1)

Somebody was wondering on #git channel why a git generated diff
does not apply with GNU patch when the filename contains a SP.
It is because GNU patch expects to find TAB (and trailing timestamp)
on ---/+++ (old_name and new_name) lines after the filenames.

The "diff --git" output format was carefully designed to be
compatible with GNU patch where it can, but whitespace
characters were always a pain.

We can make our output a bit more GNU patch friendly by adding an
extra TAB (but not trailing timestamp) to old/new name lines when
the filename as a SP in it.  This updates git-apply to prepare
ourselves to accept such a patch, but we still do not generate
output that is patch friendly yet.  That change needs to wait
until everybody has this change.

When a filename contains a real tab, "diff --git" format
always c-quotes it as discussed on the list with GNU patch
maintainer previously:

http://marc.theaimsgroup.com/?l=git&m=112927316408690&w=2

so there should be no downside.

Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/builtin-apply.c b/builtin-apply.c
index de5f855266f6fcf3274c9648b02ab960a267bb90..a7317d7544b3d18a5beddc69e2a92b110a7a4ba9 100644 (file)
--- a/builtin-apply.c
+++ b/builtin-apply.c
@@ -360,7 +360,7 @@ static int gitdiff_hdrend(const char *line, struct patch *patch)
 static char *gitdiff_verify_name(const char *line, int isnull, char *orig_name, const char *oldnew)
 {
        if (!orig_name && !isnull)
-               return find_name(line, NULL, 1, 0);
+               return find_name(line, NULL, 1, TERM_TAB);
 
        if (orig_name) {
                int len;
@@ -370,7 +370,7 @@ static char *gitdiff_verify_name(const char *line, int isnull, char *orig_name,
                len = strlen(name);
                if (isnull)
                        die("git-apply: bad git-diff - expected /dev/null, got %s on line %d", name, linenr);
-               another = find_name(line, NULL, 1, 0);
+               another = find_name(line, NULL, 1, TERM_TAB);
                if (!another || memcmp(another, name, len))
                        die("git-apply: bad git-diff - inconsistent %s filename on line %d", oldnew, linenr);
                free(another);