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#include "cache.h"
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#include "commit.h"
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#include "refs.h"
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#include "pkt-line.h"
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static const char send_pack_usage[] =
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"git-send-pack [--all] [--exec=git-receive-pack] <remote> [<head>...]\n"
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" --all and explicit <head> specification are mutually exclusive.";
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static const char *exec = "git-receive-pack";
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static int send_all = 0;
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static int force_update = 0;
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static int is_zero_sha1(const unsigned char *sha1)
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{
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int i;
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for (i = 0; i < 20; i++) {
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if (*sha1++)
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return 0;
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}
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return 1;
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}
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static void exec_pack_objects(void)
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{
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static char *args[] = {
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"git-pack-objects",
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"--stdout",
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NULL
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};
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execvp("git-pack-objects", args);
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die("git-pack-objects exec failed (%s)", strerror(errno));
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}
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static void exec_rev_list(struct ref *refs)
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{
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static char *args[1000];
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int i = 0;
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args[i++] = "git-rev-list"; /* 0 */
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args[i++] = "--objects"; /* 1 */
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while (refs) {
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char *buf = malloc(100);
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if (i > 900)
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die("git-rev-list environment overflow");
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if (!is_zero_sha1(refs->old_sha1) &&
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has_sha1_file(refs->old_sha1)) {
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args[i++] = buf;
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snprintf(buf, 50, "^%s", sha1_to_hex(refs->old_sha1));
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buf += 50;
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}
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if (!is_zero_sha1(refs->new_sha1)) {
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args[i++] = buf;
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snprintf(buf, 50, "%s", sha1_to_hex(refs->new_sha1));
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}
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refs = refs->next;
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}
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args[i] = NULL;
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execvp("git-rev-list", args);
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die("git-rev-list exec failed (%s)", strerror(errno));
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}
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static void rev_list(int fd, struct ref *refs)
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{
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int pipe_fd[2];
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pid_t pack_objects_pid;
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if (pipe(pipe_fd) < 0)
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die("rev-list setup: pipe failed");
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pack_objects_pid = fork();
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if (!pack_objects_pid) {
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dup2(pipe_fd[0], 0);
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dup2(fd, 1);
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close(pipe_fd[0]);
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close(pipe_fd[1]);
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close(fd);
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exec_pack_objects();
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die("pack-objects setup failed");
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}
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if (pack_objects_pid < 0)
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die("pack-objects fork failed");
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dup2(pipe_fd[1], 1);
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close(pipe_fd[0]);
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close(pipe_fd[1]);
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close(fd);
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exec_rev_list(refs);
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}
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static int pack_objects(int fd, struct ref *refs)
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{
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pid_t rev_list_pid;
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rev_list_pid = fork();
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if (!rev_list_pid) {
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rev_list(fd, refs);
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die("rev-list setup failed");
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}
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if (rev_list_pid < 0)
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die("rev-list fork failed");
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/*
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* We don't wait for the rev-list pipeline in the parent:
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* we end up waiting for the other end instead
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*/
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return 0;
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}
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static int read_ref(const char *ref, unsigned char *sha1)
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{
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int fd, ret;
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char buffer[60];
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fd = open(git_path("%s", ref), O_RDONLY);
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if (fd < 0)
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return -1;
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ret = -1;
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if (read(fd, buffer, sizeof(buffer)) >= 40)
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ret = get_sha1_hex(buffer, sha1);
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close(fd);
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return ret;
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}
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static int ref_newer(const unsigned char *new_sha1, const unsigned char *old_sha1)
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{
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struct commit *new, *old;
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struct commit_list *list;
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if (force_update)
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return 1;
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old = lookup_commit_reference(old_sha1);
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if (!old)
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return 0;
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new = lookup_commit_reference(new_sha1);
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if (!new)
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return 0;
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if (parse_commit(new) < 0)
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return 0;
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list = NULL;
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commit_list_insert(new, &list);
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while (list) {
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new = pop_most_recent_commit(&list, 1);
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if (new == old)
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return 1;
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}
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return 0;
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}
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static int local_ref_nr_match;
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static char **local_ref_match;
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static struct ref *local_ref_list;
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static struct ref **local_last_ref;
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static int try_to_match(const char *refname, const unsigned char *sha1)
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{
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struct ref *ref;
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int len;
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if (!path_match(refname, local_ref_nr_match, local_ref_match)) {
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if (!send_all)
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return 0;
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/* If we have it listed already, skip it */
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for (ref = local_ref_list ; ref ; ref = ref->next) {
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if (!strcmp(ref->name, refname))
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return 0;
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}
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}
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len = strlen(refname)+1;
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ref = xmalloc(sizeof(*ref) + len);
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memset(ref->old_sha1, 0, 20);
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memcpy(ref->new_sha1, sha1, 20);
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memcpy(ref->name, refname, len);
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ref->next = NULL;
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*local_last_ref = ref;
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local_last_ref = &ref->next;
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return 0;
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}
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static int send_pack(int in, int out, int nr_match, char **match)
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{
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struct ref *ref_list, **last_ref;
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struct ref *ref;
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int new_refs;
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/* First we get all heads, whether matching or not.. */
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last_ref = get_remote_heads(in, &ref_list, 0, NULL);
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/*
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* Go through the refs, see if we want to update
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* any of them..
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*/
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for (ref = ref_list; ref; ref = ref->next) {
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unsigned char new_sha1[20];
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char *name = ref->name;
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if (nr_match && !path_match(name, nr_match, match))
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continue;
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if (read_ref(name, new_sha1) < 0)
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continue;
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if (!memcmp(ref->old_sha1, new_sha1, 20)) {
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fprintf(stderr, "'%s' unchanged\n", name);
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continue;
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}
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if (!has_sha1_file(ref->old_sha1)) {
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error("remote '%s' object %s does not exist on local",
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name, sha1_to_hex(ref->old_sha1));
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continue;
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}
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if (!ref_newer(new_sha1, ref->old_sha1)) {
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error("remote '%s' isn't a strict parent of local", name);
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continue;
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}
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/* Ok, mark it for update */
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memcpy(ref->new_sha1, new_sha1, 20);
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}
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/*
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* See if we have any refs that the other end didn't have
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*/
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if (nr_match || send_all) {
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local_ref_nr_match = nr_match;
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local_ref_match = match;
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local_ref_list = ref_list;
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local_last_ref = last_ref;
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for_each_ref(try_to_match);
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}
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/*
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* Finally, tell the other end!
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*/
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new_refs = 0;
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for (ref = ref_list; ref; ref = ref->next) {
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char old_hex[60], *new_hex;
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if (is_zero_sha1(ref->new_sha1))
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continue;
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new_refs++;
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strcpy(old_hex, sha1_to_hex(ref->old_sha1));
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new_hex = sha1_to_hex(ref->new_sha1);
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packet_write(out, "%s %s %s", old_hex, new_hex, ref->name);
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fprintf(stderr, "'%s': updating from %s to %s\n", ref->name, old_hex, new_hex);
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}
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packet_flush(out);
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if (new_refs)
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pack_objects(out, ref_list);
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close(out);
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return 0;
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}
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int main(int argc, char **argv)
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{
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int i, nr_heads = 0;
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char *dest = NULL;
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char **heads = NULL;
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int fd[2], ret;
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pid_t pid;
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argv++;
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for (i = 1; i < argc; i++, argv++) {
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char *arg = *argv;
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if (*arg == '-') {
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if (!strncmp(arg, "--exec=", 7)) {
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exec = arg + 7;
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continue;
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}
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if (!strcmp(arg, "--all")) {
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send_all = 1;
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continue;
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}
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if (!strcmp(arg, "--force")) {
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force_update = 1;
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continue;
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}
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usage(send_pack_usage);
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}
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if (!dest) {
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dest = arg;
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continue;
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}
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heads = argv;
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nr_heads = argc - i;
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break;
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}
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if (!dest)
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usage(send_pack_usage);
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if (heads && send_all)
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usage(send_pack_usage);
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pid = git_connect(fd, dest, exec);
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if (pid < 0)
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return 1;
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ret = send_pack(fd[0], fd[1], nr_heads, heads);
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close(fd[0]);
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close(fd[1]);
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finish_connect(pid);
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return ret;
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}
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