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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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8
Documentation/git-fast-export.txt
View File

@ -82,6 +82,14 @@ marks the same across runs.
allow that. So fake a tagger to be able to fast-import the
output.
--no-data::
Skip output of blob objects and instead refer to blobs via
their original SHA-1 hash. This is useful when rewriting the
directory structure or history of a repository without
touching the contents of individual files. Note that the
resulting stream can only be used by a repository which
already contains the necessary objects.
[git-rev-list-args...]::
A list of arguments, acceptable to 'git-rev-parse' and
'git-rev-list', that specifies the specific objects and references

9
builtin-fast-export.c
View File

@ -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()
};