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fetch-pack: start multi-head pulling.

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This is a beginning of resurrecting the multi-head pulling support
for git-fetch-pack command.  The git-fetch-script wrapper still
only knows about fetching a single head, without renaming, so it is
not very useful unless you directly call git-fetch-pack itself yet.

It also fixes a longstanding obsolete description of how the command
discovers the list of local commits.
This commit is contained in:
Junio C Hamano
2005-08-12 02:08:29 -07:00
parent 87b7b84159
commit 33b8303466
3 changed files with 51 additions and 27 deletions
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56
fetch-pack.c
View File

@@ -4,10 +4,13 @@
#include <sys/wait.h>
static int quiet;
static const char fetch_pack_usage[] = "git-fetch-pack [-q] [--exec=upload-pack] [host:]directory [heads]* < mycommitlist";
static int verbose;
static const char fetch_pack_usage[] =
"git-fetch-pack [-q] [-v] [--exec=upload-pack] [host:]directory <refs>...";
static const char *exec = "git-upload-pack";
static int find_common(int fd[2], unsigned char *result_sha1, unsigned char *remote)
static int find_common(int fd[2], unsigned char *result_sha1,
struct ref *refs)
{
static char line[1000];
int count = 0, flushes = 0, retval;
@@ -16,7 +19,16 @@ static int find_common(int fd[2], unsigned char *result_sha1, unsigned char *rem
revs = popen("git-rev-list $(git-rev-parse --all)", "r");
if (!revs)
die("unable to run 'git-rev-list'");
packet_write(fd[1], "want %s\n", sha1_to_hex(remote));
while (refs) {
unsigned char *remote = refs->old_sha1;
if (verbose)
fprintf(stderr,
"want %s (%s)\n", sha1_to_hex(remote),
refs->name);
packet_write(fd[1], "want %s\n", sha1_to_hex(remote));
refs = refs->next;
}
packet_flush(fd[1]);
flushes = 1;
retval = -1;
@@ -25,6 +37,8 @@ static int find_common(int fd[2], unsigned char *result_sha1, unsigned char *rem
if (get_sha1_hex(line, sha1))
die("git-fetch-pack: expected object name, got crud");
packet_write(fd[1], "have %s\n", sha1_to_hex(sha1));
if (verbose)
fprintf(stderr, "have %s\n", sha1_to_hex(sha1));
if (!(31 & ++count)) {
packet_flush(fd[1]);
flushes++;
@@ -38,6 +52,8 @@ static int find_common(int fd[2], unsigned char *result_sha1, unsigned char *rem
if (get_ack(fd[0], result_sha1)) {
flushes = 0;
retval = 0;
if (verbose)
fprintf(stderr, "got ack\n");
break;
}
flushes--;
@@ -45,19 +61,19 @@ static int find_common(int fd[2], unsigned char *result_sha1, unsigned char *rem
}
pclose(revs);
packet_write(fd[1], "done\n");
if (verbose)
fprintf(stderr, "done\n");
while (flushes) {
flushes--;
if (get_ack(fd[0], result_sha1))
if (get_ack(fd[0], result_sha1)) {
if (verbose)
fprintf(stderr, "got ack\n");
return 0;
}
}
return retval;
}
/*
* Eventually we'll want to be able to fetch multiple heads.
*
* Right now we'll just require a single match.
*/
static int fetch_pack(int fd[2], int nr_match, char **match)
{
struct ref *ref;
@@ -70,12 +86,8 @@ static int fetch_pack(int fd[2], int nr_match, char **match)
packet_flush(fd[1]);
die("no matching remote head");
}
if (ref->next) {
packet_flush(fd[1]);
die("multiple remote heads");
}
if (find_common(fd, sha1, ref->old_sha1) < 0)
die("git-fetch-pack: no common commits");
if (find_common(fd, sha1, ref) < 0)
fprintf(stderr, "warning: no common commits\n");
pid = fork();
if (pid < 0)
die("git-fetch-pack: unable to fork off git-unpack-objects");
@@ -97,7 +109,11 @@ static int fetch_pack(int fd[2], int nr_match, char **match)
int code = WEXITSTATUS(status);
if (code)
die("git-unpack-objects died with error code %d", code);
puts(sha1_to_hex(ref->old_sha1));
while (ref) {
printf("%s %s\n",
sha1_to_hex(ref->old_sha1), ref->name);
ref = ref->next;
}
return 0;
}
if (WIFSIGNALED(status)) {
@@ -124,6 +140,14 @@ int main(int argc, char **argv)
exec = arg + 7;
continue;
}
if (!strcmp("-q", arg)) {
quiet = 1;
continue;
}
if (!strcmp("-v", arg)) {
verbose = 1;
continue;
}
usage(fetch_pack_usage);
}
dest = arg;