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https://github.com/git/git
synced 2024-08-24 18:26:02 +00:00
![Shawn O. Pearce](/assets/img/avatar_default.png)
The new protocol extension "include-tag" allows the client side of the connection (fetch-pack) to request that the server side of the native git protocol (upload-pack / pack-objects) use --include-tag as it prepares the packfile, thus ensuring that an annotated tag object will be included in the resulting packfile if the object it refers to was also included into the packfile. Signed-off-by: Shawn O. Pearce <spearce@spearce.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
652 lines
16 KiB
C
652 lines
16 KiB
C
#include "cache.h"
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#include "refs.h"
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#include "pkt-line.h"
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#include "sideband.h"
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#include "tag.h"
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#include "object.h"
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#include "commit.h"
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#include "exec_cmd.h"
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#include "diff.h"
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#include "revision.h"
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#include "list-objects.h"
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#include "run-command.h"
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static const char upload_pack_usage[] = "git-upload-pack [--strict] [--timeout=nn] <dir>";
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/* bits #0..7 in revision.h, #8..10 in commit.c */
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#define THEY_HAVE (1u << 11)
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#define OUR_REF (1u << 12)
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#define WANTED (1u << 13)
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#define COMMON_KNOWN (1u << 14)
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#define REACHABLE (1u << 15)
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#define SHALLOW (1u << 16)
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#define NOT_SHALLOW (1u << 17)
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#define CLIENT_SHALLOW (1u << 18)
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static unsigned long oldest_have;
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static int multi_ack, nr_our_refs;
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static int use_thin_pack, use_ofs_delta, use_include_tag;
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static int no_progress;
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static struct object_array have_obj;
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static struct object_array want_obj;
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static unsigned int timeout;
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/* 0 for no sideband,
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* otherwise maximum packet size (up to 65520 bytes).
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*/
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static int use_sideband;
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static int debug_fd;
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static void reset_timeout(void)
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{
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alarm(timeout);
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}
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static int strip(char *line, int len)
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{
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if (len && line[len-1] == '\n')
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line[--len] = 0;
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return len;
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}
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static ssize_t send_client_data(int fd, const char *data, ssize_t sz)
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{
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if (use_sideband)
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return send_sideband(1, fd, data, sz, use_sideband);
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if (fd == 3)
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/* emergency quit */
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fd = 2;
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if (fd == 2) {
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/* XXX: are we happy to lose stuff here? */
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xwrite(fd, data, sz);
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return sz;
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}
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return safe_write(fd, data, sz);
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}
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static FILE *pack_pipe = NULL;
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static void show_commit(struct commit *commit)
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{
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if (commit->object.flags & BOUNDARY)
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fputc('-', pack_pipe);
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if (fputs(sha1_to_hex(commit->object.sha1), pack_pipe) < 0)
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die("broken output pipe");
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fputc('\n', pack_pipe);
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fflush(pack_pipe);
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free(commit->buffer);
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commit->buffer = NULL;
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}
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static void show_object(struct object_array_entry *p)
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{
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/* An object with name "foo\n0000000..." can be used to
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* confuse downstream git-pack-objects very badly.
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*/
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const char *ep = strchr(p->name, '\n');
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if (ep) {
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fprintf(pack_pipe, "%s %.*s\n", sha1_to_hex(p->item->sha1),
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(int) (ep - p->name),
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p->name);
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}
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else
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fprintf(pack_pipe, "%s %s\n",
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sha1_to_hex(p->item->sha1), p->name);
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}
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static void show_edge(struct commit *commit)
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{
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fprintf(pack_pipe, "-%s\n", sha1_to_hex(commit->object.sha1));
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}
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static int do_rev_list(int fd, void *create_full_pack)
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{
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int i;
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struct rev_info revs;
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pack_pipe = fdopen(fd, "w");
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if (create_full_pack)
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use_thin_pack = 0; /* no point doing it */
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init_revisions(&revs, NULL);
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revs.tag_objects = 1;
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revs.tree_objects = 1;
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revs.blob_objects = 1;
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if (use_thin_pack)
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revs.edge_hint = 1;
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if (create_full_pack) {
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const char *args[] = {"rev-list", "--all", NULL};
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setup_revisions(2, args, &revs, NULL);
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} else {
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for (i = 0; i < want_obj.nr; i++) {
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struct object *o = want_obj.objects[i].item;
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/* why??? */
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o->flags &= ~UNINTERESTING;
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add_pending_object(&revs, o, NULL);
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}
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for (i = 0; i < have_obj.nr; i++) {
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struct object *o = have_obj.objects[i].item;
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o->flags |= UNINTERESTING;
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add_pending_object(&revs, o, NULL);
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}
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setup_revisions(0, NULL, &revs, NULL);
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}
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if (prepare_revision_walk(&revs))
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die("revision walk setup failed");
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mark_edges_uninteresting(revs.commits, &revs, show_edge);
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traverse_commit_list(&revs, show_commit, show_object);
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return 0;
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}
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static void create_pack_file(void)
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{
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struct async rev_list;
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struct child_process pack_objects;
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int create_full_pack = (nr_our_refs == want_obj.nr && !have_obj.nr);
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char data[8193], progress[128];
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char abort_msg[] = "aborting due to possible repository "
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"corruption on the remote side.";
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int buffered = -1;
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ssize_t sz;
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const char *argv[10];
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int arg = 0;
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rev_list.proc = do_rev_list;
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/* .data is just a boolean: any non-NULL value will do */
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rev_list.data = create_full_pack ? &rev_list : NULL;
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if (start_async(&rev_list))
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die("git-upload-pack: unable to fork git-rev-list");
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argv[arg++] = "pack-objects";
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argv[arg++] = "--stdout";
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if (!no_progress)
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argv[arg++] = "--progress";
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if (use_ofs_delta)
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argv[arg++] = "--delta-base-offset";
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if (use_include_tag)
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argv[arg++] = "--include-tag";
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argv[arg++] = NULL;
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memset(&pack_objects, 0, sizeof(pack_objects));
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pack_objects.in = rev_list.out; /* start_command closes it */
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pack_objects.out = -1;
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pack_objects.err = -1;
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pack_objects.git_cmd = 1;
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pack_objects.argv = argv;
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if (start_command(&pack_objects))
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die("git-upload-pack: unable to fork git-pack-objects");
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/* We read from pack_objects.err to capture stderr output for
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* progress bar, and pack_objects.out to capture the pack data.
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*/
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while (1) {
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struct pollfd pfd[2];
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int pe, pu, pollsize;
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reset_timeout();
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pollsize = 0;
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pe = pu = -1;
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if (0 <= pack_objects.out) {
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pfd[pollsize].fd = pack_objects.out;
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pfd[pollsize].events = POLLIN;
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pu = pollsize;
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pollsize++;
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}
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if (0 <= pack_objects.err) {
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pfd[pollsize].fd = pack_objects.err;
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pfd[pollsize].events = POLLIN;
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pe = pollsize;
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pollsize++;
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}
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if (!pollsize)
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break;
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if (poll(pfd, pollsize, -1) < 0) {
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if (errno != EINTR) {
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error("poll failed, resuming: %s",
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strerror(errno));
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sleep(1);
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}
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continue;
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}
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if (0 <= pu && (pfd[pu].revents & (POLLIN|POLLHUP))) {
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/* Data ready; we keep the last byte to ourselves
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* in case we detect broken rev-list, so that we
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* can leave the stream corrupted. This is
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* unfortunate -- unpack-objects would happily
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* accept a valid packdata with trailing garbage,
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* so appending garbage after we pass all the
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* pack data is not good enough to signal
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* breakage to downstream.
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*/
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char *cp = data;
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ssize_t outsz = 0;
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if (0 <= buffered) {
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*cp++ = buffered;
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outsz++;
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}
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sz = xread(pack_objects.out, cp,
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sizeof(data) - outsz);
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if (0 < sz)
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;
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else if (sz == 0) {
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close(pack_objects.out);
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pack_objects.out = -1;
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}
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else
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goto fail;
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sz += outsz;
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if (1 < sz) {
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buffered = data[sz-1] & 0xFF;
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sz--;
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}
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else
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buffered = -1;
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sz = send_client_data(1, data, sz);
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if (sz < 0)
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goto fail;
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}
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if (0 <= pe && (pfd[pe].revents & (POLLIN|POLLHUP))) {
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/* Status ready; we ship that in the side-band
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* or dump to the standard error.
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*/
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sz = xread(pack_objects.err, progress,
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sizeof(progress));
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if (0 < sz)
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send_client_data(2, progress, sz);
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else if (sz == 0) {
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close(pack_objects.err);
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pack_objects.err = -1;
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}
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else
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goto fail;
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}
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}
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if (finish_command(&pack_objects)) {
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error("git-upload-pack: git-pack-objects died with error.");
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goto fail;
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}
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if (finish_async(&rev_list))
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goto fail; /* error was already reported */
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/* flush the data */
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if (0 <= buffered) {
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data[0] = buffered;
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sz = send_client_data(1, data, 1);
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if (sz < 0)
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goto fail;
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fprintf(stderr, "flushed.\n");
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}
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if (use_sideband)
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packet_flush(1);
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return;
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fail:
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send_client_data(3, abort_msg, sizeof(abort_msg));
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die("git-upload-pack: %s", abort_msg);
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}
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static int got_sha1(char *hex, unsigned char *sha1)
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{
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struct object *o;
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int we_knew_they_have = 0;
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if (get_sha1_hex(hex, sha1))
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die("git-upload-pack: expected SHA1 object, got '%s'", hex);
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if (!has_sha1_file(sha1))
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return -1;
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o = lookup_object(sha1);
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if (!(o && o->parsed))
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o = parse_object(sha1);
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if (!o)
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die("oops (%s)", sha1_to_hex(sha1));
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if (o->type == OBJ_COMMIT) {
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struct commit_list *parents;
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struct commit *commit = (struct commit *)o;
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if (o->flags & THEY_HAVE)
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we_knew_they_have = 1;
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else
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o->flags |= THEY_HAVE;
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if (!oldest_have || (commit->date < oldest_have))
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oldest_have = commit->date;
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for (parents = commit->parents;
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parents;
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parents = parents->next)
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parents->item->object.flags |= THEY_HAVE;
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}
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if (!we_knew_they_have) {
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add_object_array(o, NULL, &have_obj);
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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 reachable(struct commit *want)
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{
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struct commit_list *work = NULL;
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insert_by_date(want, &work);
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while (work) {
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struct commit_list *list = work->next;
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struct commit *commit = work->item;
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free(work);
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work = list;
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if (commit->object.flags & THEY_HAVE) {
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want->object.flags |= COMMON_KNOWN;
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break;
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}
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if (!commit->object.parsed)
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parse_object(commit->object.sha1);
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if (commit->object.flags & REACHABLE)
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continue;
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commit->object.flags |= REACHABLE;
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if (commit->date < oldest_have)
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continue;
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for (list = commit->parents; list; list = list->next) {
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struct commit *parent = list->item;
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if (!(parent->object.flags & REACHABLE))
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insert_by_date(parent, &work);
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}
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}
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want->object.flags |= REACHABLE;
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clear_commit_marks(want, REACHABLE);
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free_commit_list(work);
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return (want->object.flags & COMMON_KNOWN);
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}
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static int ok_to_give_up(void)
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{
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int i;
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if (!have_obj.nr)
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return 0;
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for (i = 0; i < want_obj.nr; i++) {
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struct object *want = want_obj.objects[i].item;
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if (want->flags & COMMON_KNOWN)
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continue;
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want = deref_tag(want, "a want line", 0);
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if (!want || want->type != OBJ_COMMIT) {
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/* no way to tell if this is reachable by
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* looking at the ancestry chain alone, so
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* leave a note to ourselves not to worry about
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* this object anymore.
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*/
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want_obj.objects[i].item->flags |= COMMON_KNOWN;
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continue;
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}
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if (!reachable((struct commit *)want))
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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 int get_common_commits(void)
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{
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static char line[1000];
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unsigned char sha1[20];
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char hex[41], last_hex[41];
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int len;
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save_commit_buffer = 0;
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for(;;) {
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len = packet_read_line(0, line, sizeof(line));
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reset_timeout();
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if (!len) {
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if (have_obj.nr == 0 || multi_ack)
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packet_write(1, "NAK\n");
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continue;
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}
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len = strip(line, len);
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if (!prefixcmp(line, "have ")) {
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switch (got_sha1(line+5, sha1)) {
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case -1: /* they have what we do not */
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if (multi_ack && ok_to_give_up())
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packet_write(1, "ACK %s continue\n",
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sha1_to_hex(sha1));
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break;
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default:
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memcpy(hex, sha1_to_hex(sha1), 41);
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if (multi_ack) {
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const char *msg = "ACK %s continue\n";
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packet_write(1, msg, hex);
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memcpy(last_hex, hex, 41);
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}
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else if (have_obj.nr == 1)
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packet_write(1, "ACK %s\n", hex);
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break;
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}
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continue;
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}
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if (!strcmp(line, "done")) {
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if (have_obj.nr > 0) {
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if (multi_ack)
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packet_write(1, "ACK %s\n", last_hex);
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return 0;
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}
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packet_write(1, "NAK\n");
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return -1;
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}
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die("git-upload-pack: expected SHA1 list, got '%s'", line);
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}
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}
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static void receive_needs(void)
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{
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struct object_array shallows = {0, 0, NULL};
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static char line[1000];
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int len, depth = 0;
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if (debug_fd)
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write_in_full(debug_fd, "#S\n", 3);
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for (;;) {
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struct object *o;
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unsigned char sha1_buf[20];
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len = packet_read_line(0, line, sizeof(line));
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reset_timeout();
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if (!len)
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break;
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if (debug_fd)
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write_in_full(debug_fd, line, len);
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if (!prefixcmp(line, "shallow ")) {
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unsigned char sha1[20];
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struct object *object;
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use_thin_pack = 0;
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if (get_sha1(line + 8, sha1))
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die("invalid shallow line: %s", line);
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object = parse_object(sha1);
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if (!object)
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die("did not find object for %s", line);
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object->flags |= CLIENT_SHALLOW;
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add_object_array(object, NULL, &shallows);
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continue;
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}
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if (!prefixcmp(line, "deepen ")) {
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char *end;
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use_thin_pack = 0;
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depth = strtol(line + 7, &end, 0);
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if (end == line + 7 || depth <= 0)
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die("Invalid deepen: %s", line);
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continue;
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}
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if (prefixcmp(line, "want ") ||
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get_sha1_hex(line+5, sha1_buf))
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die("git-upload-pack: protocol error, "
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"expected to get sha, not '%s'", line);
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if (strstr(line+45, "multi_ack"))
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multi_ack = 1;
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if (strstr(line+45, "thin-pack"))
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use_thin_pack = 1;
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if (strstr(line+45, "ofs-delta"))
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use_ofs_delta = 1;
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if (strstr(line+45, "side-band-64k"))
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use_sideband = LARGE_PACKET_MAX;
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else if (strstr(line+45, "side-band"))
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use_sideband = DEFAULT_PACKET_MAX;
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if (strstr(line+45, "no-progress"))
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no_progress = 1;
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if (strstr(line+45, "include-tag"))
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use_include_tag = 1;
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/* We have sent all our refs already, and the other end
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* should have chosen out of them; otherwise they are
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* asking for nonsense.
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*
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* Hmph. We may later want to allow "want" line that
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* asks for something like "master~10" (symbolic)...
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* would it make sense? I don't know.
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*/
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o = lookup_object(sha1_buf);
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if (!o || !(o->flags & OUR_REF))
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die("git-upload-pack: not our ref %s", line+5);
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if (!(o->flags & WANTED)) {
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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;
|
|
|
|
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(NULL);
|
|
|
|
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;
|
|
}
|