+#include <signal.h>
+#include <sys/wait.h>
+#include <sys/poll.h>
#include "cache.h"
#include "refs.h"
#include "pkt-line.h"
+#include "tag.h"
+#include "object.h"
+#include "commit.h"
+#include "exec_cmd.h"
static const char upload_pack_usage[] = "git-upload-pack [--strict] [--timeout=nn] <dir>";
-#define MAX_HAS (16)
-#define MAX_NEEDS (256)
-static int nr_has = 0, nr_needs = 0;
+#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)
{
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;
+ if (fd == 2) {
+ xwrite(fd, data, sz);
+ return sz;
+ }
+ 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)
{
- int fd[2];
- pid_t pid;
+ /* 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(fd) < 0)
+ if (pipe(lp_pipe) < 0)
die("git-upload-pack: unable to create pipe");
- pid = fork();
- if (pid < 0)
+ pid_rev_list = fork();
+ if (pid_rev_list < 0)
die("git-upload-pack: unable to fork git-rev-list");
- if (!pid) {
+ if (!pid_rev_list) {
int i;
int args;
- char **argv;
+ const char **argv;
+ const char **p;
char *buf;
- char **p;
- if (MAX_NEEDS <= nr_needs)
- args = nr_has + 10;
+ if (create_full_pack) {
+ args = 10;
+ use_thin_pack = 0; /* no point doing it */
+ }
else
args = nr_has + nr_needs + 5;
- argv = xmalloc(args * sizeof(char *));
+ p = xmalloc(args * sizeof(char *));
+ argv = (const char **) p;
buf = xmalloc(args * 45);
- p = argv;
- dup2(fd[1], 1);
+ dup2(lp_pipe[1], 1);
close(0);
- close(fd[0]);
- close(fd[1]);
- *p++ = "git-rev-list";
- *p++ = "--objects";
- if (MAX_NEEDS <= nr_needs)
+ 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++) {
buf += 41;
}
}
- for (i = 0; i < nr_has; i++) {
- *p++ = buf;
- *buf++ = '^';
- memcpy(buf, sha1_to_hex(has_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;
- execvp("git-rev-list", argv);
+ execv_git_cmd(argv);
die("git-upload-pack: unable to exec git-rev-list");
}
- dup2(fd[0], 0);
- close(fd[0]);
- close(fd[1]);
- execlp("git-pack-objects", "git-pack-objects", "--stdout", NULL);
- die("git-upload-pack: unable to exec git-pack-objects");
+
+ 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;
+
+ reset_timeout();
+
+ 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)
{
- int nr;
if (get_sha1_hex(hex, sha1))
die("git-upload-pack: expected SHA1 object, got '%s'", hex);
if (!has_sha1_file(sha1))
return 0;
- nr = nr_has;
- if (nr < MAX_HAS) {
- memcpy(has_sha1[nr], sha1, 20);
- nr_has = nr+1;
+ 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 == OBJ_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];
+ 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) {
- packet_write(1, "NAK\n");
+ 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)) {
- packet_write(1, "ACK %s\n", sha1_to_hex(sha1));
- break;
+ 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);
}
-
- for (;;) {
- len = packet_read_line(0, line, sizeof(line));
- reset_timeout();
- if (!len)
- continue;
- len = strip(line, len);
- if (!strncmp(line, "have ", 5)) {
- got_sha1(line+5, sha1);
- continue;
- }
- if (!strcmp(line, "done"))
- break;
- die("git-upload-pack: expected SHA1 list, got '%s'", line);
- }
- return 0;
}
static int receive_needs(void)
needs = 0;
for (;;) {
+ struct object *o;
unsigned char dummy[20], *sha1_buf;
len = packet_read_line(0, line, sizeof(line));
reset_timeout();
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);
- needs++;
+ 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)
{
- packet_write(1, "%s %s\n", sha1_to_hex(sha1), refname);
+ 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 == OBJ_TAG) {
+ o = deref_tag(o, refname, 0);
+ packet_write(1, "%s %s^{}\n", sha1_to_hex(o->sha1), refname);
+ }
return 0;
}
int main(int argc, char **argv)
{
- const char *dir;
+ char *dir;
int i;
int strict = 0;
usage(upload_pack_usage);
dir = argv[i];
- /* chdir to the directory. If that fails, try appending ".git" */
- if (chdir(dir) < 0) {
- if (strict || chdir(mkpath("%s.git", dir)) < 0)
- die("git-upload-pack unable to chdir to %s", dir);
- }
- if (!strict)
- chdir(".git");
-
- if (access("objects", X_OK) || access("refs", X_OK))
- die("git-upload-pack: %s doesn't seem to be a git archive", dir);
+ if (!enter_repo(dir, strict))
+ die("'%s': unable to chdir or not a git archive", dir);
- putenv("GIT_DIR=.");
upload_pack();
return 0;
}