#include "cache.h" #include "refs.h" #include "pkt-line.h" #include "sideband.h" #include "tag.h" #include "object.h" #include "commit.h" #include "exec_cmd.h" #include "diff.h" #include "revision.h" #include "list-objects.h" #include "run-command.h" static const char upload_pack_usage[] = "git upload-pack [--strict] [--timeout=nn] <dir>"; /* bits #0..7 in revision.h, #8..10 in commit.c */ #define THEY_HAVE (1u << 11) #define OUR_REF (1u << 12) #define WANTED (1u << 13) #define COMMON_KNOWN (1u << 14) #define REACHABLE (1u << 15) #define SHALLOW (1u << 16) #define NOT_SHALLOW (1u << 17) #define CLIENT_SHALLOW (1u << 18) static unsigned long oldest_have; static int multi_ack, nr_our_refs; static int use_thin_pack, use_ofs_delta, use_include_tag; static int no_progress; static struct object_array have_obj; static struct object_array want_obj; static unsigned int timeout; /* 0 for no sideband, * otherwise maximum packet size (up to 65520 bytes). */ static int use_sideband; static int debug_fd; 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; } static ssize_t send_client_data(int fd, const char *data, ssize_t sz) { if (use_sideband) return send_sideband(1, fd, data, sz, use_sideband); if (fd == 3) /* emergency quit */ fd = 2; if (fd == 2) { /* XXX: are we happy to lose stuff here? */ xwrite(fd, data, sz); return sz; } return safe_write(fd, data, sz); } static FILE *pack_pipe = NULL; static void show_commit(struct commit *commit) { if (commit->object.flags & BOUNDARY) fputc('-', pack_pipe); if (fputs(sha1_to_hex(commit->object.sha1), pack_pipe) < 0) die("broken output pipe"); fputc('\n', pack_pipe); fflush(pack_pipe); free(commit->buffer); commit->buffer = NULL; } static void show_object(struct object_array_entry *p) { /* An object with name "foo\n0000000..." can be used to * confuse downstream git-pack-objects very badly. */ const char *ep = strchr(p->name, '\n'); if (ep) { fprintf(pack_pipe, "%s %.*s\n", sha1_to_hex(p->item->sha1), (int) (ep - p->name), p->name); } else fprintf(pack_pipe, "%s %s\n", sha1_to_hex(p->item->sha1), p->name); } static void show_edge(struct commit *commit) { fprintf(pack_pipe, "-%s\n", sha1_to_hex(commit->object.sha1)); } static int do_rev_list(int fd, void *create_full_pack) { int i; struct rev_info revs; pack_pipe = fdopen(fd, "w"); if (create_full_pack) use_thin_pack = 0; /* no point doing it */ init_revisions(&revs, NULL); revs.tag_objects = 1; revs.tree_objects = 1; revs.blob_objects = 1; if (use_thin_pack) revs.edge_hint = 1; if (create_full_pack) { const char *args[] = {"rev-list", "--all", NULL}; setup_revisions(2, args, &revs, NULL); } else { for (i = 0; i < want_obj.nr; i++) { struct object *o = want_obj.objects[i].item; /* why??? */ o->flags &= ~UNINTERESTING; add_pending_object(&revs, o, NULL); } for (i = 0; i < have_obj.nr; i++) { struct object *o = have_obj.objects[i].item; o->flags |= UNINTERESTING; add_pending_object(&revs, o, NULL); } setup_revisions(0, NULL, &revs, NULL); } if (prepare_revision_walk(&revs)) die("revision walk setup failed"); mark_edges_uninteresting(revs.commits, &revs, show_edge); traverse_commit_list(&revs, show_commit, show_object); fflush(pack_pipe); fclose(pack_pipe); return 0; } static void create_pack_file(void) { struct async rev_list; struct child_process pack_objects; int create_full_pack = (nr_our_refs == want_obj.nr && !have_obj.nr); char data[8193], progress[128]; char abort_msg[] = "aborting due to possible repository " "corruption on the remote side."; int buffered = -1; ssize_t sz; const char *argv[10]; int arg = 0; rev_list.proc = do_rev_list; /* .data is just a boolean: any non-NULL value will do */ rev_list.data = create_full_pack ? &rev_list : NULL; if (start_async(&rev_list)) die("git upload-pack: unable to fork git-rev-list"); argv[arg++] = "pack-objects"; argv[arg++] = "--stdout"; if (!no_progress) argv[arg++] = "--progress"; if (use_ofs_delta) argv[arg++] = "--delta-base-offset"; if (use_include_tag) argv[arg++] = "--include-tag"; argv[arg++] = NULL; memset(&pack_objects, 0, sizeof(pack_objects)); pack_objects.in = rev_list.out; /* start_command closes it */ pack_objects.out = -1; pack_objects.err = -1; pack_objects.git_cmd = 1; pack_objects.argv = argv; if (start_command(&pack_objects)) die("git upload-pack: unable to fork git-pack-objects"); /* We read from pack_objects.err to capture stderr output for * progress bar, and pack_objects.out to capture the pack data. */ while (1) { struct pollfd pfd[2]; int pe, pu, pollsize; reset_timeout(); pollsize = 0; pe = pu = -1; if (0 <= pack_objects.out) { pfd[pollsize].fd = pack_objects.out; pfd[pollsize].events = POLLIN; pu = pollsize; pollsize++; } if (0 <= pack_objects.err) { pfd[pollsize].fd = pack_objects.err; pfd[pollsize].events = POLLIN; pe = pollsize; pollsize++; } if (!pollsize) break; 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 packdata 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 = xread(pack_objects.out, cp, sizeof(data) - outsz); if (0 < sz) ; else if (sz == 0) { close(pack_objects.out); pack_objects.out = -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 = xread(pack_objects.err, progress, sizeof(progress)); if (0 < sz) send_client_data(2, progress, sz); else if (sz == 0) { close(pack_objects.err); pack_objects.err = -1; } else goto fail; } } if (finish_command(&pack_objects)) { error("git upload-pack: git-pack-objects died with error."); goto fail; } if (finish_async(&rev_list)) goto fail; /* error was already reported */ /* 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"); } if (use_sideband) packet_flush(1); return; fail: 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) { struct object *o; int we_knew_they_have = 0; if (get_sha1_hex(hex, sha1)) die("git upload-pack: expected SHA1 object, got '%s'", hex); if (!has_sha1_file(sha1)) return -1; 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; struct commit *commit = (struct commit *)o; if (o->flags & THEY_HAVE) we_knew_they_have = 1; else o->flags |= THEY_HAVE; if (!oldest_have || (commit->date < oldest_have)) oldest_have = commit->date; for (parents = commit->parents; parents; parents = parents->next) parents->item->object.flags |= THEY_HAVE; } if (!we_knew_they_have) { add_object_array(o, NULL, &have_obj); return 1; } return 0; } static int reachable(struct commit *want) { struct commit_list *work = NULL; insert_by_date(want, &work); while (work) { struct commit_list *list = work->next; struct commit *commit = work->item; free(work); work = list; if (commit->object.flags & THEY_HAVE) { want->object.flags |= COMMON_KNOWN; break; } if (!commit->object.parsed) parse_object(commit->object.sha1); if (commit->object.flags & REACHABLE) continue; commit->object.flags |= REACHABLE; if (commit->date < oldest_have) continue; for (list = commit->parents; list; list = list->next) { struct commit *parent = list->item; if (!(parent->object.flags & REACHABLE)) insert_by_date(parent, &work); } } want->object.flags |= REACHABLE; clear_commit_marks(want, REACHABLE); free_commit_list(work); return (want->object.flags & COMMON_KNOWN); } static int ok_to_give_up(void) { int i; if (!have_obj.nr) return 0; for (i = 0; i < want_obj.nr; i++) { struct object *want = want_obj.objects[i].item; if (want->flags & COMMON_KNOWN) continue; want = deref_tag(want, "a want line", 0); if (!want || want->type != OBJ_COMMIT) { /* no way to tell if this is reachable by * looking at the ancestry chain alone, so * leave a note to ourselves not to worry about * this object anymore. */ want_obj.objects[i].item->flags |= COMMON_KNOWN; continue; } if (!reachable((struct commit *)want)) return 0; } return 1; } static int get_common_commits(void) { static char line[1000]; unsigned char sha1[20]; char hex[41], last_hex[41]; int len; save_commit_buffer = 0; for(;;) { len = packet_read_line(0, line, sizeof(line)); reset_timeout(); if (!len) { if (have_obj.nr == 0 || multi_ack) packet_write(1, "NAK\n"); continue; } len = strip(line, len); if (!prefixcmp(line, "have ")) { switch (got_sha1(line+5, sha1)) { case -1: /* they have what we do not */ if (multi_ack && ok_to_give_up()) packet_write(1, "ACK %s continue\n", sha1_to_hex(sha1)); break; default: memcpy(hex, sha1_to_hex(sha1), 41); if (multi_ack) { const char *msg = "ACK %s continue\n"; packet_write(1, msg, hex); memcpy(last_hex, hex, 41); } else if (have_obj.nr == 1) packet_write(1, "ACK %s\n", hex); break; } continue; } if (!strcmp(line, "done")) { if (have_obj.nr > 0) { if (multi_ack) packet_write(1, "ACK %s\n", last_hex); return 0; } packet_write(1, "NAK\n"); return -1; } die("git upload-pack: expected SHA1 list, got '%s'", line); } } static void receive_needs(void) { struct object_array shallows = {0, 0, NULL}; static char line[1000]; int len, depth = 0; if (debug_fd) write_in_full(debug_fd, "#S\n", 3); for (;;) { struct object *o; unsigned char sha1_buf[20]; len = packet_read_line(0, line, sizeof(line)); reset_timeout(); if (!len) break; if (debug_fd) write_in_full(debug_fd, line, len); if (!prefixcmp(line, "shallow ")) { unsigned char sha1[20]; struct object *object; use_thin_pack = 0; if (get_sha1(line + 8, sha1)) die("invalid shallow line: %s", line); object = parse_object(sha1); if (!object) die("did not find object for %s", line); object->flags |= CLIENT_SHALLOW; add_object_array(object, NULL, &shallows); continue; } if (!prefixcmp(line, "deepen ")) { char *end; use_thin_pack = 0; depth = strtol(line + 7, &end, 0); if (end == line + 7 || depth <= 0) die("Invalid deepen: %s", line); continue; } if (prefixcmp(line, "want ") || 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, "ofs-delta")) use_ofs_delta = 1; if (strstr(line+45, "side-band-64k")) use_sideband = LARGE_PACKET_MAX; else if (strstr(line+45, "side-band")) use_sideband = DEFAULT_PACKET_MAX; if (strstr(line+45, "no-progress")) no_progress = 1; if (strstr(line+45, "include-tag")) use_include_tag = 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; add_object_array(o, NULL, &want_obj); } } if (debug_fd) write_in_full(debug_fd, "#E\n", 3); if (depth == 0 && shallows.nr == 0) return; if (depth > 0) { struct commit_list *result, *backup; int i; backup = result = get_shallow_commits(&want_obj, depth, SHALLOW, NOT_SHALLOW); while (result) { struct object *object = &result->item->object; if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) { packet_write(1, "shallow %s", sha1_to_hex(object->sha1)); register_shallow(object->sha1); } result = result->next; } free_commit_list(backup); for (i = 0; i < shallows.nr; i++) { struct object *object = shallows.objects[i].item; if (object->flags & NOT_SHALLOW) { struct commit_list *parents; packet_write(1, "unshallow %s", sha1_to_hex(object->sha1)); object->flags &= ~CLIENT_SHALLOW; /* make sure the real parents are parsed */ unregister_shallow(object->sha1); object->parsed = 0; if (parse_commit((struct commit *)object)) die("invalid commit"); parents = ((struct commit *)object)->parents; while (parents) { add_object_array(&parents->item->object, NULL, &want_obj); parents = parents->next; } } /* make sure commit traversal conforms to client */ register_shallow(object->sha1); } packet_flush(1); } else if (shallows.nr > 0) { int i; for (i = 0; i < shallows.nr; i++) register_shallow(shallows.objects[i].item->sha1); } free(shallows.objects); } static int send_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data) { static const char *capabilities = "multi_ack thin-pack side-band" " side-band-64k ofs-delta shallow no-progress" " include-tag"; 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); if (o) packet_write(1, "%s %s^{}\n", sha1_to_hex(o->sha1), refname); } return 0; } static void upload_pack(void) { reset_timeout(); head_ref(send_ref, NULL); for_each_ref(send_ref, NULL); packet_flush(1); receive_needs(); if (want_obj.nr) { get_common_commits(); create_pack_file(); } } int main(int argc, char **argv) { char *dir; int i; int strict = 0; git_extract_argv0_path(argv[0]); for (i = 1; i < argc; i++) { char *arg = argv[i]; if (arg[0] != '-') break; if (!strcmp(arg, "--strict")) { strict = 1; continue; } if (!prefixcmp(arg, "--timeout=")) { timeout = atoi(arg+10); continue; } if (!strcmp(arg, "--")) { i++; break; } } if (i != argc-1) usage(upload_pack_usage); setup_path(); dir = argv[i]; if (!enter_repo(dir, strict)) die("'%s': unable to chdir or not a git archive", dir); if (is_repository_shallow()) die("attempt to fetch/clone from a shallow repository"); if (getenv("GIT_DEBUG_SEND_PACK")) debug_fd = atoi(getenv("GIT_DEBUG_SEND_PACK")); upload_pack(); return 0; }