зеркало из https://github.com/microsoft/git.git
516 строки
11 KiB
C
516 строки
11 KiB
C
#include "cache.h"
|
|
#include "refs.h"
|
|
#include "pkt-line.h"
|
|
#include "tag.h"
|
|
#include "object.h"
|
|
#include "commit.h"
|
|
#include "exec_cmd.h"
|
|
#include <signal.h>
|
|
#include <sys/poll.h>
|
|
#include <sys/wait.h>
|
|
|
|
static const char upload_pack_usage[] = "git-upload-pack [--strict] [--timeout=nn] <dir>";
|
|
|
|
#define THEY_HAVE (1U << 0)
|
|
#define OUR_REF (1U << 1)
|
|
#define WANTED (1U << 2)
|
|
#define MAX_HAS 256
|
|
#define MAX_NEEDS 256
|
|
static int nr_has = 0, nr_needs = 0, multi_ack = 0, nr_our_refs = 0;
|
|
static int use_thin_pack = 0;
|
|
static unsigned char has_sha1[MAX_HAS][20];
|
|
static unsigned char needs_sha1[MAX_NEEDS][20];
|
|
static unsigned int timeout = 0;
|
|
static int use_sideband = 0;
|
|
|
|
static void reset_timeout(void)
|
|
{
|
|
alarm(timeout);
|
|
}
|
|
|
|
static int strip(char *line, int len)
|
|
{
|
|
if (len && line[len-1] == '\n')
|
|
line[--len] = 0;
|
|
return len;
|
|
}
|
|
|
|
#define PACKET_MAX 1000
|
|
static ssize_t send_client_data(int fd, const char *data, ssize_t sz)
|
|
{
|
|
ssize_t ssz;
|
|
const char *p;
|
|
|
|
if (!data) {
|
|
if (!use_sideband)
|
|
return 0;
|
|
packet_flush(1);
|
|
}
|
|
|
|
if (!use_sideband) {
|
|
if (fd == 3)
|
|
/* emergency quit */
|
|
fd = 2;
|
|
return safe_write(fd, data, sz);
|
|
}
|
|
p = data;
|
|
ssz = sz;
|
|
while (sz) {
|
|
unsigned n;
|
|
char hdr[5];
|
|
|
|
n = sz;
|
|
if (PACKET_MAX - 5 < n)
|
|
n = PACKET_MAX - 5;
|
|
sprintf(hdr, "%04x", n + 5);
|
|
hdr[4] = fd;
|
|
safe_write(1, hdr, 5);
|
|
safe_write(1, p, n);
|
|
p += n;
|
|
sz -= n;
|
|
}
|
|
return ssz;
|
|
}
|
|
|
|
static void create_pack_file(void)
|
|
{
|
|
/* Pipes between rev-list to pack-objects, pack-objects to us
|
|
* and pack-objects error stream for progress bar.
|
|
*/
|
|
int lp_pipe[2], pu_pipe[2], pe_pipe[2];
|
|
pid_t pid_rev_list, pid_pack_objects;
|
|
int create_full_pack = (nr_our_refs == nr_needs && !nr_has);
|
|
char data[8193], progress[128];
|
|
char abort_msg[] = "aborting due to possible repository "
|
|
"corruption on the remote side.";
|
|
int buffered = -1;
|
|
|
|
if (pipe(lp_pipe) < 0)
|
|
die("git-upload-pack: unable to create pipe");
|
|
pid_rev_list = fork();
|
|
if (pid_rev_list < 0)
|
|
die("git-upload-pack: unable to fork git-rev-list");
|
|
|
|
if (!pid_rev_list) {
|
|
int i;
|
|
int args;
|
|
const char **argv;
|
|
const char **p;
|
|
char *buf;
|
|
|
|
if (create_full_pack) {
|
|
args = 10;
|
|
use_thin_pack = 0; /* no point doing it */
|
|
}
|
|
else
|
|
args = nr_has + nr_needs + 5;
|
|
p = xmalloc(args * sizeof(char *));
|
|
argv = (const char **) p;
|
|
buf = xmalloc(args * 45);
|
|
|
|
dup2(lp_pipe[1], 1);
|
|
close(0);
|
|
close(lp_pipe[0]);
|
|
close(lp_pipe[1]);
|
|
*p++ = "rev-list";
|
|
*p++ = use_thin_pack ? "--objects-edge" : "--objects";
|
|
if (create_full_pack || MAX_NEEDS <= nr_needs)
|
|
*p++ = "--all";
|
|
else {
|
|
for (i = 0; i < nr_needs; i++) {
|
|
*p++ = buf;
|
|
memcpy(buf, sha1_to_hex(needs_sha1[i]), 41);
|
|
buf += 41;
|
|
}
|
|
}
|
|
if (!create_full_pack)
|
|
for (i = 0; i < nr_has; i++) {
|
|
*p++ = buf;
|
|
*buf++ = '^';
|
|
memcpy(buf, sha1_to_hex(has_sha1[i]), 41);
|
|
buf += 41;
|
|
}
|
|
*p++ = NULL;
|
|
execv_git_cmd(argv);
|
|
die("git-upload-pack: unable to exec git-rev-list");
|
|
}
|
|
|
|
if (pipe(pu_pipe) < 0)
|
|
die("git-upload-pack: unable to create pipe");
|
|
if (pipe(pe_pipe) < 0)
|
|
die("git-upload-pack: unable to create pipe");
|
|
pid_pack_objects = fork();
|
|
if (pid_pack_objects < 0) {
|
|
/* daemon sets things up to ignore TERM */
|
|
kill(pid_rev_list, SIGKILL);
|
|
die("git-upload-pack: unable to fork git-pack-objects");
|
|
}
|
|
if (!pid_pack_objects) {
|
|
dup2(lp_pipe[0], 0);
|
|
dup2(pu_pipe[1], 1);
|
|
dup2(pe_pipe[1], 2);
|
|
|
|
close(lp_pipe[0]);
|
|
close(lp_pipe[1]);
|
|
close(pu_pipe[0]);
|
|
close(pu_pipe[1]);
|
|
close(pe_pipe[0]);
|
|
close(pe_pipe[1]);
|
|
execl_git_cmd("pack-objects", "--stdout", "--progress", NULL);
|
|
kill(pid_rev_list, SIGKILL);
|
|
die("git-upload-pack: unable to exec git-pack-objects");
|
|
}
|
|
|
|
close(lp_pipe[0]);
|
|
close(lp_pipe[1]);
|
|
|
|
/* We read from pe_pipe[0] to capture stderr output for
|
|
* progress bar, and pu_pipe[0] to capture the pack data.
|
|
*/
|
|
close(pe_pipe[1]);
|
|
close(pu_pipe[1]);
|
|
|
|
while (1) {
|
|
const char *who;
|
|
struct pollfd pfd[2];
|
|
pid_t pid;
|
|
int status;
|
|
ssize_t sz;
|
|
int pe, pu, pollsize;
|
|
|
|
pollsize = 0;
|
|
pe = pu = -1;
|
|
|
|
if (0 <= pu_pipe[0]) {
|
|
pfd[pollsize].fd = pu_pipe[0];
|
|
pfd[pollsize].events = POLLIN;
|
|
pu = pollsize;
|
|
pollsize++;
|
|
}
|
|
if (0 <= pe_pipe[0]) {
|
|
pfd[pollsize].fd = pe_pipe[0];
|
|
pfd[pollsize].events = POLLIN;
|
|
pe = pollsize;
|
|
pollsize++;
|
|
}
|
|
|
|
if (pollsize) {
|
|
if (poll(pfd, pollsize, -1) < 0) {
|
|
if (errno != EINTR) {
|
|
error("poll failed, resuming: %s",
|
|
strerror(errno));
|
|
sleep(1);
|
|
}
|
|
continue;
|
|
}
|
|
if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
|
|
/* Data ready; we keep the last byte
|
|
* to ourselves in case we detect
|
|
* broken rev-list, so that we can
|
|
* leave the stream corrupted. This
|
|
* is unfortunate -- unpack-objects
|
|
* would happily accept a valid pack
|
|
* data with trailing garbage, so
|
|
* appending garbage after we pass all
|
|
* the pack data is not good enough to
|
|
* signal breakage to downstream.
|
|
*/
|
|
char *cp = data;
|
|
ssize_t outsz = 0;
|
|
if (0 <= buffered) {
|
|
*cp++ = buffered;
|
|
outsz++;
|
|
}
|
|
sz = read(pu_pipe[0], cp,
|
|
sizeof(data) - outsz);
|
|
if (0 < sz)
|
|
;
|
|
else if (sz == 0) {
|
|
close(pu_pipe[0]);
|
|
pu_pipe[0] = -1;
|
|
}
|
|
else
|
|
goto fail;
|
|
sz += outsz;
|
|
if (1 < sz) {
|
|
buffered = data[sz-1] & 0xFF;
|
|
sz--;
|
|
}
|
|
else
|
|
buffered = -1;
|
|
sz = send_client_data(1, data, sz);
|
|
if (sz < 0)
|
|
goto fail;
|
|
}
|
|
if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
|
|
/* Status ready; we ship that in the side-band
|
|
* or dump to the standard error.
|
|
*/
|
|
sz = read(pe_pipe[0], progress,
|
|
sizeof(progress));
|
|
if (0 < sz)
|
|
send_client_data(2, progress, sz);
|
|
else if (sz == 0) {
|
|
close(pe_pipe[0]);
|
|
pe_pipe[0] = -1;
|
|
}
|
|
else
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
/* See if the children are still there */
|
|
if (pid_rev_list || pid_pack_objects) {
|
|
pid = waitpid(-1, &status, WNOHANG);
|
|
if (!pid)
|
|
continue;
|
|
who = ((pid == pid_rev_list) ? "git-rev-list" :
|
|
(pid == pid_pack_objects) ? "git-pack-objects" :
|
|
NULL);
|
|
if (!who) {
|
|
if (pid < 0) {
|
|
error("git-upload-pack: %s",
|
|
strerror(errno));
|
|
goto fail;
|
|
}
|
|
error("git-upload-pack: we weren't "
|
|
"waiting for %d", pid);
|
|
continue;
|
|
}
|
|
if (!WIFEXITED(status) || WEXITSTATUS(status) > 0) {
|
|
error("git-upload-pack: %s died with error.",
|
|
who);
|
|
goto fail;
|
|
}
|
|
if (pid == pid_rev_list)
|
|
pid_rev_list = 0;
|
|
if (pid == pid_pack_objects)
|
|
pid_pack_objects = 0;
|
|
if (pid_rev_list || pid_pack_objects)
|
|
continue;
|
|
}
|
|
|
|
/* both died happily */
|
|
if (pollsize)
|
|
continue;
|
|
|
|
/* flush the data */
|
|
if (0 <= buffered) {
|
|
data[0] = buffered;
|
|
sz = send_client_data(1, data, 1);
|
|
if (sz < 0)
|
|
goto fail;
|
|
fprintf(stderr, "flushed.\n");
|
|
}
|
|
send_client_data(1, NULL, 0);
|
|
return;
|
|
}
|
|
fail:
|
|
if (pid_pack_objects)
|
|
kill(pid_pack_objects, SIGKILL);
|
|
if (pid_rev_list)
|
|
kill(pid_rev_list, SIGKILL);
|
|
send_client_data(3, abort_msg, sizeof(abort_msg));
|
|
die("git-upload-pack: %s", abort_msg);
|
|
}
|
|
|
|
static int got_sha1(char *hex, unsigned char *sha1)
|
|
{
|
|
if (get_sha1_hex(hex, sha1))
|
|
die("git-upload-pack: expected SHA1 object, got '%s'", hex);
|
|
if (!has_sha1_file(sha1))
|
|
return 0;
|
|
if (nr_has < MAX_HAS) {
|
|
struct object *o = lookup_object(sha1);
|
|
if (!(o && o->parsed))
|
|
o = parse_object(sha1);
|
|
if (!o)
|
|
die("oops (%s)", sha1_to_hex(sha1));
|
|
if (o->type == TYPE_COMMIT) {
|
|
struct commit_list *parents;
|
|
if (o->flags & THEY_HAVE)
|
|
return 0;
|
|
o->flags |= THEY_HAVE;
|
|
for (parents = ((struct commit*)o)->parents;
|
|
parents;
|
|
parents = parents->next)
|
|
parents->item->object.flags |= THEY_HAVE;
|
|
}
|
|
memcpy(has_sha1[nr_has++], sha1, 20);
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static int get_common_commits(void)
|
|
{
|
|
static char line[1000];
|
|
unsigned char sha1[20], last_sha1[20];
|
|
int len;
|
|
|
|
track_object_refs = 0;
|
|
save_commit_buffer = 0;
|
|
|
|
for(;;) {
|
|
len = packet_read_line(0, line, sizeof(line));
|
|
reset_timeout();
|
|
|
|
if (!len) {
|
|
if (nr_has == 0 || multi_ack)
|
|
packet_write(1, "NAK\n");
|
|
continue;
|
|
}
|
|
len = strip(line, len);
|
|
if (!strncmp(line, "have ", 5)) {
|
|
if (got_sha1(line+5, sha1) &&
|
|
(multi_ack || nr_has == 1)) {
|
|
if (nr_has >= MAX_HAS)
|
|
multi_ack = 0;
|
|
packet_write(1, "ACK %s%s\n",
|
|
sha1_to_hex(sha1),
|
|
multi_ack ? " continue" : "");
|
|
if (multi_ack)
|
|
memcpy(last_sha1, sha1, 20);
|
|
}
|
|
continue;
|
|
}
|
|
if (!strcmp(line, "done")) {
|
|
if (nr_has > 0) {
|
|
if (multi_ack)
|
|
packet_write(1, "ACK %s\n",
|
|
sha1_to_hex(last_sha1));
|
|
return 0;
|
|
}
|
|
packet_write(1, "NAK\n");
|
|
return -1;
|
|
}
|
|
die("git-upload-pack: expected SHA1 list, got '%s'", line);
|
|
}
|
|
}
|
|
|
|
static int receive_needs(void)
|
|
{
|
|
static char line[1000];
|
|
int len, needs;
|
|
|
|
needs = 0;
|
|
for (;;) {
|
|
struct object *o;
|
|
unsigned char dummy[20], *sha1_buf;
|
|
len = packet_read_line(0, line, sizeof(line));
|
|
reset_timeout();
|
|
if (!len)
|
|
return needs;
|
|
|
|
sha1_buf = dummy;
|
|
if (needs == MAX_NEEDS) {
|
|
fprintf(stderr,
|
|
"warning: supporting only a max of %d requests. "
|
|
"sending everything instead.\n",
|
|
MAX_NEEDS);
|
|
}
|
|
else if (needs < MAX_NEEDS)
|
|
sha1_buf = needs_sha1[needs];
|
|
|
|
if (strncmp("want ", line, 5) || get_sha1_hex(line+5, sha1_buf))
|
|
die("git-upload-pack: protocol error, "
|
|
"expected to get sha, not '%s'", line);
|
|
if (strstr(line+45, "multi_ack"))
|
|
multi_ack = 1;
|
|
if (strstr(line+45, "thin-pack"))
|
|
use_thin_pack = 1;
|
|
if (strstr(line+45, "side-band"))
|
|
use_sideband = 1;
|
|
|
|
/* We have sent all our refs already, and the other end
|
|
* should have chosen out of them; otherwise they are
|
|
* asking for nonsense.
|
|
*
|
|
* Hmph. We may later want to allow "want" line that
|
|
* asks for something like "master~10" (symbolic)...
|
|
* would it make sense? I don't know.
|
|
*/
|
|
o = lookup_object(sha1_buf);
|
|
if (!o || !(o->flags & OUR_REF))
|
|
die("git-upload-pack: not our ref %s", line+5);
|
|
if (!(o->flags & WANTED)) {
|
|
o->flags |= WANTED;
|
|
needs++;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int send_ref(const char *refname, const unsigned char *sha1)
|
|
{
|
|
static const char *capabilities = "multi_ack thin-pack side-band";
|
|
struct object *o = parse_object(sha1);
|
|
|
|
if (!o)
|
|
die("git-upload-pack: cannot find object %s:", sha1_to_hex(sha1));
|
|
|
|
if (capabilities)
|
|
packet_write(1, "%s %s%c%s\n", sha1_to_hex(sha1), refname,
|
|
0, capabilities);
|
|
else
|
|
packet_write(1, "%s %s\n", sha1_to_hex(sha1), refname);
|
|
capabilities = NULL;
|
|
if (!(o->flags & OUR_REF)) {
|
|
o->flags |= OUR_REF;
|
|
nr_our_refs++;
|
|
}
|
|
if (o->type == TYPE_TAG) {
|
|
o = deref_tag(o, refname, 0);
|
|
packet_write(1, "%s %s^{}\n", sha1_to_hex(o->sha1), refname);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int upload_pack(void)
|
|
{
|
|
reset_timeout();
|
|
head_ref(send_ref);
|
|
for_each_ref(send_ref);
|
|
packet_flush(1);
|
|
nr_needs = receive_needs();
|
|
if (!nr_needs)
|
|
return 0;
|
|
get_common_commits();
|
|
create_pack_file();
|
|
return 0;
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
char *dir;
|
|
int i;
|
|
int strict = 0;
|
|
|
|
for (i = 1; i < argc; i++) {
|
|
char *arg = argv[i];
|
|
|
|
if (arg[0] != '-')
|
|
break;
|
|
if (!strcmp(arg, "--strict")) {
|
|
strict = 1;
|
|
continue;
|
|
}
|
|
if (!strncmp(arg, "--timeout=", 10)) {
|
|
timeout = atoi(arg+10);
|
|
continue;
|
|
}
|
|
if (!strcmp(arg, "--")) {
|
|
i++;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (i != argc-1)
|
|
usage(upload_pack_usage);
|
|
dir = argv[i];
|
|
|
|
if (!enter_repo(dir, strict))
|
|
die("'%s': unable to chdir or not a git archive", dir);
|
|
|
|
upload_pack();
|
|
return 0;
|
|
}
|