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diff-index.c: "git diff" has no need to read blob from the standard input

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Only "diff --no-index -" does.  Bolting the logic into the low-level
function diff_populate_filespec() was a layering violation from day
one.  Move populate_from_stdin() function out of the generic diff.c
to its only user, diff-index.c.

Also make sure "-" from the command line stays a special token "read
from the standard input", even if we later decide to sanitize the
result from prefix_filename() function in a few obvious ways,
e.g. removing unnecessary "./" prefix, duplicated slashes "//" in
the middle, etc.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Junio C Hamano
2012-06-27 20:14:47 -07:00
parent 3b069b1beb
commit 4682d8521c
4 changed files with 55 additions and 31 deletions
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52
diff-no-index.c
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@ -32,6 +32,13 @@ static int read_directory(const char *path, struct string_list *list)
return 0;
}
/*
* This should be "(standard input)" or something, but it will
* probably expose many more breakages in the way no-index code
* is bolted onto the diff callchain.
*/
static const char file_from_standard_input[] = "-";
static int get_mode(const char *path, int *mode)
{
struct stat st;
@ -42,7 +49,7 @@ static int get_mode(const char *path, int *mode)
else if (!strcasecmp(path, "nul"))
*mode = 0;
#endif
else if (!strcmp(path, "-"))
else if (path == file_from_standard_input)
*mode = create_ce_mode(0666);
else if (lstat(path, &st))
return error("Could not access '%s'", path);
@ -51,6 +58,36 @@ static int get_mode(const char *path, int *mode)
return 0;
}
static int populate_from_stdin(struct diff_filespec *s)
{
struct strbuf buf = STRBUF_INIT;
size_t size = 0;
if (strbuf_read(&buf, 0, 0) < 0)
return error("error while reading from stdin %s",
strerror(errno));
s->should_munmap = 0;
s->data = strbuf_detach(&buf, &size);
s->size = size;
s->should_free = 1;
s->is_stdin = 1;
return 0;
}
static struct diff_filespec *noindex_filespec(const char *name, int mode)
{
struct diff_filespec *s;
if (!name)
name = "/dev/null";
s = alloc_filespec(name);
fill_filespec(s, null_sha1, mode);
if (name == file_from_standard_input)
populate_from_stdin(s);
return s;
}
static int queue_diff(struct diff_options *o,
const char *name1, const char *name2)
{
@ -135,15 +172,8 @@ static int queue_diff(struct diff_options *o,
tmp_c = name1; name1 = name2; name2 = tmp_c;
}
if (!name1)
name1 = "/dev/null";
if (!name2)
name2 = "/dev/null";
d1 = alloc_filespec(name1);
d2 = alloc_filespec(name2);
fill_filespec(d1, null_sha1, mode1);
fill_filespec(d2, null_sha1, mode2);
d1 = noindex_filespec(name1, mode1);
d2 = noindex_filespec(name2, mode2);
diff_queue(&diff_queued_diff, d1, d2);
return 0;
}
@ -238,7 +268,7 @@ void diff_no_index(struct rev_info *revs,
* stdin should be spelled as "-"; if you have
* path that is "-", spell it as "./-".
*/
p = p;
p = file_from_standard_input;
else if (prefixlen)
p = xstrdup(prefix_filename(prefix, prefixlen, p));
paths[i] = p;