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git fast-export: add --no-data option

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When using git fast-export and git fast-import to rewrite the history
of a repository with large binary files, almost all of the time is
spent dealing with blobs.  This is extremely inefficient if all we want
to do is rewrite the commits and tree structure.  --no-data skips the
output of blobs and writes SHA-1s instead of marks, which provides a
massive speedup.

Signed-off-by: Geoffrey Irving <irving@naml.us>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Geoffrey Irving
2009-07-27 22:20:22 -04:00
committed by Junio C Hamano
parent 86b5efb286
commit 79559f27be
2 changed files with 16 additions and 1 deletions
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9
builtin-fast-export.c
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@ -26,6 +26,7 @@ static int progress;
static enum { ABORT, VERBATIM, WARN, STRIP } signed_tag_mode = ABORT;
static enum { ERROR, DROP, REWRITE } tag_of_filtered_mode = ABORT;
static int fake_missing_tagger;
static int no_data;
static int parse_opt_signed_tag_mode(const struct option *opt,
const char *arg, int unset)
@ -116,6 +117,9 @@ static void handle_object(const unsigned char *sha1)
char *buf;
struct object *object;
if (no_data)
return;
if (is_null_sha1(sha1))
return;
@ -173,7 +177,7 @@ static void show_filemodify(struct diff_queue_struct *q,
* Links refer to objects in another repositories;
* output the SHA-1 verbatim.
*/
if (S_ISGITLINK(spec->mode))
if (no_data || S_ISGITLINK(spec->mode))
printf("M %06o %s %s\n", spec->mode,
sha1_to_hex(spec->sha1), spec->path);
else {
@ -580,6 +584,9 @@ int cmd_fast_export(int argc, const char **argv, const char *prefix)
"Import marks from this file"),
OPT_BOOLEAN(0, "fake-missing-tagger", &fake_missing_tagger,
"Fake a tagger when tags lack one"),
{ OPTION_NEGBIT, 0, "data", &no_data, NULL,
"Skip output of blob data",
PARSE_OPT_NOARG | PARSE_OPT_NEGHELP, NULL, 1 },
OPT_END()
};