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

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>

diff --git a/Documentation/git-fast-export.txt b/Documentation/git-fast-export.txt
index af2328d401cef30311996cf0376ad17c83c6c516..75b06f33e73497fbb8916ef02d70ca59f4aab2f6 100644 (file)
--- a/Documentation/git-fast-export.txt
+++ b/Documentation/git-fast-export.txt
@@ -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

diff --git a/builtin-fast-export.c b/builtin-fast-export.c
index c48c18d0c89d1050a531d0521135c2bed9e3b77d..b0a4029c94d1bdb1c673fe604cdbfec93df875aa 100644 (file)
--- a/builtin-fast-export.c
+++ b/builtin-fast-export.c
@@ -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()
        };