#include "cache.h" #include "commit.h" #include "tag.h" #include "refs.h" #include "pkt-line.h" static const char send_pack_usage[] = "git-send-pack [--all] [--exec=git-receive-pack] [...]\n" " --all and explicit specification are mutually exclusive."; static const char *exec = "git-receive-pack"; static int send_all = 0; static int force_update = 0; static int is_zero_sha1(const unsigned char *sha1) { int i; for (i = 0; i < 20; i++) { if (*sha1++) return 0; } return 1; } static void exec_pack_objects(void) { static char *args[] = { "git-pack-objects", "--stdout", NULL }; execvp("git-pack-objects", args); die("git-pack-objects exec failed (%s)", strerror(errno)); } static void exec_rev_list(struct ref *refs) { static char *args[1000]; int i = 0; args[i++] = "git-rev-list"; /* 0 */ args[i++] = "--objects"; /* 1 */ while (refs) { char *buf = malloc(100); if (i > 900) die("git-rev-list environment overflow"); if (!is_zero_sha1(refs->old_sha1) && has_sha1_file(refs->old_sha1)) { args[i++] = buf; snprintf(buf, 50, "^%s", sha1_to_hex(refs->old_sha1)); buf += 50; } if (!is_zero_sha1(refs->new_sha1)) { args[i++] = buf; snprintf(buf, 50, "%s", sha1_to_hex(refs->new_sha1)); } refs = refs->next; } args[i] = NULL; execvp("git-rev-list", args); die("git-rev-list exec failed (%s)", strerror(errno)); } static void rev_list(int fd, struct ref *refs) { int pipe_fd[2]; pid_t pack_objects_pid; if (pipe(pipe_fd) < 0) die("rev-list setup: pipe failed"); pack_objects_pid = fork(); if (!pack_objects_pid) { dup2(pipe_fd[0], 0); dup2(fd, 1); close(pipe_fd[0]); close(pipe_fd[1]); close(fd); exec_pack_objects(); die("pack-objects setup failed"); } if (pack_objects_pid < 0) die("pack-objects fork failed"); dup2(pipe_fd[1], 1); close(pipe_fd[0]); close(pipe_fd[1]); close(fd); exec_rev_list(refs); } static int pack_objects(int fd, struct ref *refs) { pid_t rev_list_pid; rev_list_pid = fork(); if (!rev_list_pid) { rev_list(fd, refs); die("rev-list setup failed"); } if (rev_list_pid < 0) die("rev-list fork failed"); /* * We don't wait for the rev-list pipeline in the parent: * we end up waiting for the other end instead */ return 0; } static void unmark_and_free(struct commit_list *list, unsigned int mark) { while (list) { struct commit_list *temp = list; temp->item->object.flags &= ~mark; list = temp->next; free(temp); } } static int ref_newer(const unsigned char *new_sha1, const unsigned char *old_sha1) { struct object *o; struct commit *old, *new; struct commit_list *list, *used; int found = 0; /* Both new and old must be commit-ish and new is descendant of * old. Otherwise we require --force. */ o = deref_tag(parse_object(old_sha1), NULL, 0); if (!o || o->type != commit_type) return 0; old = (struct commit *) o; o = deref_tag(parse_object(new_sha1), NULL, 0); if (!o || o->type != commit_type) return 0; new = (struct commit *) o; if (parse_commit(new) < 0) return 0; used = list = NULL; commit_list_insert(new, &list); while (list) { new = pop_most_recent_commit(&list, 1); commit_list_insert(new, &used); if (new == old) { found = 1; break; } } unmark_and_free(list, 1); unmark_and_free(used, 1); return found; } static struct ref *local_refs, **local_tail; static struct ref *remote_refs, **remote_tail; static int one_local_ref(const char *refname, const unsigned char *sha1) { struct ref *ref; int len = strlen(refname) + 1; ref = xcalloc(1, sizeof(*ref) + len); memcpy(ref->new_sha1, sha1, 20); memcpy(ref->name, refname, len); *local_tail = ref; local_tail = &ref->next; return 0; } static void get_local_heads(void) { local_tail = &local_refs; for_each_ref(one_local_ref); } static int send_pack(int in, int out, int nr_refspec, char **refspec) { struct ref *ref; int new_refs; int ret = 0; /* No funny business with the matcher */ remote_tail = get_remote_heads(in, &remote_refs, 0, NULL, 1); get_local_heads(); /* match them up */ if (!remote_tail) remote_tail = &remote_refs; if (match_refs(local_refs, remote_refs, &remote_tail, nr_refspec, refspec, send_all)) return -1; if (!remote_refs) { fprintf(stderr, "No refs in common and none specified; doing nothing.\n"); return 0; } /* * Finally, tell the other end! */ new_refs = 0; for (ref = remote_refs; ref; ref = ref->next) { char old_hex[60], *new_hex; if (!ref->peer_ref) continue; if (!memcmp(ref->old_sha1, ref->peer_ref->new_sha1, 20)) { fprintf(stderr, "'%s': up-to-date\n", ref->name); continue; } /* This part determines what can overwrite what. * The rules are: * * (0) you can always use --force or +A:B notation to * selectively force individual ref pairs. * * (1) if the old thing does not exist, it is OK. * * (2) if you do not have the old thing, you are not allowed * to overwrite it; you would not know what you are losing * otherwise. * * (3) if both new and old are commit-ish, and new is a * descendant of old, it is OK. */ if (!force_update && !is_zero_sha1(ref->old_sha1) && !ref->force) { if (!has_sha1_file(ref->old_sha1)) { error("remote '%s' object %s does not " "exist on local", ref->name, sha1_to_hex(ref->old_sha1)); ret = -2; continue; } /* We assume that local is fsck-clean. Otherwise * you _could_ have an old tag which points at * something you do not have, which may or may not * be a commit. */ if (!ref_newer(ref->peer_ref->new_sha1, ref->old_sha1)) { error("remote ref '%s' is not a strict " "subset of local ref '%s'.", ref->name, ref->peer_ref->name); ret = -2; continue; } } memcpy(ref->new_sha1, ref->peer_ref->new_sha1, 20); if (is_zero_sha1(ref->new_sha1)) { error("cannot happen anymore"); ret = -3; continue; } new_refs++; strcpy(old_hex, sha1_to_hex(ref->old_sha1)); new_hex = sha1_to_hex(ref->new_sha1); packet_write(out, "%s %s %s", old_hex, new_hex, ref->name); fprintf(stderr, "updating '%s'", ref->name); if (strcmp(ref->name, ref->peer_ref->name)) fprintf(stderr, " using '%s'", ref->peer_ref->name); fprintf(stderr, "\n from %s\n to %s\n", old_hex, new_hex); } packet_flush(out); if (new_refs) pack_objects(out, remote_refs); close(out); return ret; } int main(int argc, char **argv) { int i, nr_heads = 0; char *dest = NULL; char **heads = NULL; int fd[2], ret; pid_t pid; setup_git_directory(); argv++; for (i = 1; i < argc; i++, argv++) { char *arg = *argv; if (*arg == '-') { if (!strncmp(arg, "--exec=", 7)) { exec = arg + 7; continue; } if (!strcmp(arg, "--all")) { send_all = 1; continue; } if (!strcmp(arg, "--force")) { force_update = 1; continue; } usage(send_pack_usage); } if (!dest) { dest = arg; continue; } heads = argv; nr_heads = argc - i; break; } if (!dest) usage(send_pack_usage); if (heads && send_all) usage(send_pack_usage); pid = git_connect(fd, dest, exec); if (pid < 0) return 1; ret = send_pack(fd[0], fd[1], nr_heads, heads); close(fd[0]); close(fd[1]); finish_connect(pid); return ret; }