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-rw-r--r--upload-pack.c653
1 files changed, 653 insertions, 0 deletions
diff --git a/upload-pack.c b/upload-pack.c
new file mode 100644
index 000000000..e5adbc011
--- /dev/null
+++ b/upload-pack.c
@@ -0,0 +1,653 @@
+#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;
+
+ 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;
+}
generated by cgit v1.2.1 (git 2.18.0) at 2024-12-28 04:40:56 +0000