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cat-file: provide %(deltabase) batch format

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It can be useful for debugging or analysis to see which
objects are stored as delta bases on top of others. This
information is available by running `git verify-pack`, but
that is extremely expensive (and is harder than necessary to
parse).

Instead, let's make it available as a cat-file query format,
which makes it fast and simple to get the bases for a subset
of the objects.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King
2013-12-21 09:25:22 -05:00
committed by Junio C Hamano
parent 5d642e7506
commit 65ea9c3c3d
3 changed files with 49 additions and 3 deletions
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6
builtin/cat-file.c
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@ -118,6 +118,7 @@ struct expand_data {
unsigned long size;
unsigned long disk_size;
const char *rest;
unsigned char delta_base_sha1[20];
/*
* If mark_query is true, we do not expand anything, but rather
@ -174,6 +175,11 @@ static void expand_atom(struct strbuf *sb, const char *atom, int len,
data->split_on_whitespace = 1;
else if (data->rest)
strbuf_addstr(sb, data->rest);
} else if (is_atom("deltabase", atom, len)) {
if (data->mark_query)
data->info.delta_base_sha1 = data->delta_base_sha1;
else
strbuf_addstr(sb, sha1_to_hex(data->delta_base_sha1));
} else
die("unknown format element: %.*s", len, atom);
}