d1c133f5d4
It really just boils down to one "get_remote_heads()" function, and a common "struct ref" structure definition.
145 lines
3.2 KiB
C
145 lines
3.2 KiB
C
#include "cache.h"
|
|
#include "refs.h"
|
|
#include "pkt-line.h"
|
|
#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 const char *exec = "git-upload-pack";
|
|
|
|
static int find_common(int fd[2], unsigned char *result_sha1, unsigned char *remote)
|
|
{
|
|
static char line[1000];
|
|
int count = 0, flushes = 0, retval;
|
|
FILE *revs;
|
|
|
|
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));
|
|
packet_flush(fd[1]);
|
|
flushes = 1;
|
|
retval = -1;
|
|
while (fgets(line, sizeof(line), revs) != NULL) {
|
|
unsigned char sha1[20];
|
|
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 (!(31 & ++count)) {
|
|
packet_flush(fd[1]);
|
|
flushes++;
|
|
|
|
/*
|
|
* We keep one window "ahead" of the other side, and
|
|
* will wait for an ACK only on the next one
|
|
*/
|
|
if (count == 32)
|
|
continue;
|
|
if (get_ack(fd[0], result_sha1)) {
|
|
flushes = 0;
|
|
retval = 0;
|
|
break;
|
|
}
|
|
flushes--;
|
|
}
|
|
}
|
|
pclose(revs);
|
|
packet_write(fd[1], "done\n");
|
|
while (flushes) {
|
|
flushes--;
|
|
if (get_ack(fd[0], result_sha1))
|
|
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;
|
|
unsigned char sha1[20];
|
|
int status;
|
|
pid_t pid;
|
|
|
|
get_remote_heads(fd[0], &ref, nr_match, match);
|
|
if (!ref) {
|
|
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");
|
|
pid = fork();
|
|
if (pid < 0)
|
|
die("git-fetch-pack: unable to fork off git-unpack-objects");
|
|
if (!pid) {
|
|
dup2(fd[0], 0);
|
|
close(fd[0]);
|
|
close(fd[1]);
|
|
execlp("git-unpack-objects", "git-unpack-objects",
|
|
quiet ? "-q" : NULL, NULL);
|
|
die("git-unpack-objects exec failed");
|
|
}
|
|
close(fd[0]);
|
|
close(fd[1]);
|
|
while (waitpid(pid, &status, 0) < 0) {
|
|
if (errno != EINTR)
|
|
die("waiting for git-unpack-objects: %s", strerror(errno));
|
|
}
|
|
if (WIFEXITED(status)) {
|
|
int code = WEXITSTATUS(status);
|
|
if (code)
|
|
die("git-unpack-objects died with error code %d", code);
|
|
puts(sha1_to_hex(ref->old_sha1));
|
|
return 0;
|
|
}
|
|
if (WIFSIGNALED(status)) {
|
|
int sig = WTERMSIG(status);
|
|
die("git-unpack-objects died of signal %d", sig);
|
|
}
|
|
die("Sherlock Holmes! git-unpack-objects died of unnatural causes %d!", status);
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
int i, ret, nr_heads;
|
|
char *dest = NULL, **heads;
|
|
int fd[2];
|
|
pid_t pid;
|
|
|
|
nr_heads = 0;
|
|
heads = NULL;
|
|
for (i = 1; i < argc; i++) {
|
|
char *arg = argv[i];
|
|
|
|
if (*arg == '-') {
|
|
if (!strncmp("--exec=", arg, 7)) {
|
|
exec = arg + 7;
|
|
continue;
|
|
}
|
|
usage(fetch_pack_usage);
|
|
}
|
|
dest = arg;
|
|
heads = argv + i + 1;
|
|
nr_heads = argc - i - 1;
|
|
break;
|
|
}
|
|
if (!dest)
|
|
usage(fetch_pack_usage);
|
|
pid = git_connect(fd, dest, exec);
|
|
if (pid < 0)
|
|
return 1;
|
|
ret = fetch_pack(fd, nr_heads, heads);
|
|
close(fd[0]);
|
|
close(fd[1]);
|
|
finish_connect(pid);
|
|
return ret;
|
|
}
|