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Allow fast-import frontends to reload the marks table

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I'm giving fast-import a lesson on how to reload the marks table
using the same format it outputs with --export-marks.  This way
a frontend can reload the marks table from a prior import, making
incremental imports less painful.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
This commit is contained in:
Shawn O. Pearce 2007-03-07 18:07:26 -05:00
parent 60b9004cdb
commit e8438420bb
3 changed files with 56 additions and 1 deletions
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13
Documentation/git-fast-import.txt
View File

@ -62,7 +62,18 @@ OPTIONS
Dumps the internal marks table to <file> when complete.
Marks are written one per line as `:markid SHA-1`.
Frontends can use this file to validate imports after they
have been completed.
have been completed, or to save the marks table across
incremental runs. As <file> is only opened and truncated
at checkpoint (or completion) the same path can also be
safely given to \--import-marks.
--import-marks=<file>::
Before processing any input, load the marks specified in
<file>. The input file must exist, must be readable, and
must use the same format as produced by \--export-marks.
Multiple options may be supplied to import more than one
set of marks. If a mark is defined to different values,
the last file wins.
--export-pack-edges=<file>::
After creating a packfile, print a line of data to

36
fast-import.c
View File

@ -1997,6 +1997,40 @@ static void cmd_checkpoint(void)
read_next_command();
}
static void import_marks(const char *input_file)
{
char line[512];
FILE *f = fopen(input_file, "r");
if (!f)
die("cannot read %s: %s", input_file, strerror(errno));
while (fgets(line, sizeof(line), f)) {
uintmax_t mark;
char *end;
unsigned char sha1[20];
struct object_entry *e;
end = strchr(line, '\n');
if (line[0] != ':' || !end)
die("corrupt mark line: %s", line);
*end = 0;
mark = strtoumax(line + 1, &end, 10);
if (!mark || end == line + 1
|| *end != ' ' || get_sha1(end + 1, sha1))
die("corrupt mark line: %s", line);
e = find_object(sha1);
if (!e) {
enum object_type type = sha1_object_info(sha1, NULL);
if (type < 0)
die("object not found: %s", sha1_to_hex(sha1));
e = insert_object(sha1);
e->type = type;
e->pack_id = MAX_PACK_ID;
}
insert_mark(mark, e);
}
fclose(f);
}
static const char fast_import_usage[] =
"git-fast-import [--date-format=f] [--max-pack-size=n] [--depth=n] [--active-branches=n] [--export-marks=marks.file]";
@ -2034,6 +2068,8 @@ int main(int argc, const char **argv)
max_depth = strtoul(a + 8, NULL, 0);
else if (!prefixcmp(a, "--active-branches="))
max_active_branches = strtoul(a + 18, NULL, 0);
else if (!prefixcmp(a, "--import-marks="))
import_marks(a + 15);
else if (!prefixcmp(a, "--export-marks="))
mark_file = a + 15;
else if (!prefixcmp(a, "--export-pack-edges=")) {

8
t/t9300-fast-import.sh
View File

@ -111,6 +111,14 @@ test_expect_success \
'A: verify marks output' \
'diff -u expect marks.out'
test_expect_success \
'A: verify marks import' \
'git-fast-import \
--import-marks=marks.out \
--export-marks=marks.new \
</dev/null &&
diff -u expect marks.new'
###
### series B
###