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-rw-r--r--bundle.c493
1 files changed, 493 insertions, 0 deletions
diff --git a/bundle.c b/bundle.c
new file mode 100644
index 0000000..bbf4efa
--- /dev/null
+++ b/bundle.c
@@ -0,0 +1,493 @@
+#include "cache.h"
+#include "lockfile.h"
+#include "bundle.h"
+#include "object.h"
+#include "commit.h"
+#include "diff.h"
+#include "revision.h"
+#include "list-objects.h"
+#include "run-command.h"
+#include "refs.h"
+#include "argv-array.h"
+
+static const char bundle_signature[] = "# v2 git bundle\n";
+
+static void add_to_ref_list(const unsigned char *sha1, const char *name,
+ struct ref_list *list)
+{
+ ALLOC_GROW(list->list, list->nr + 1, list->alloc);
+ hashcpy(list->list[list->nr].sha1, sha1);
+ list->list[list->nr].name = xstrdup(name);
+ list->nr++;
+}
+
+static int parse_bundle_header(int fd, struct bundle_header *header,
+ const char *report_path)
+{
+ struct strbuf buf = STRBUF_INIT;
+ int status = 0;
+
+ /* The bundle header begins with the signature */
+ if (strbuf_getwholeline_fd(&buf, fd, '\n') ||
+ strcmp(buf.buf, bundle_signature)) {
+ if (report_path)
+ error(_("'%s' does not look like a v2 bundle file"),
+ report_path);
+ status = -1;
+ goto abort;
+ }
+
+ /* The bundle header ends with an empty line */
+ while (!strbuf_getwholeline_fd(&buf, fd, '\n') &&
+ buf.len && buf.buf[0] != '\n') {
+ unsigned char sha1[20];
+ int is_prereq = 0;
+
+ if (*buf.buf == '-') {
+ is_prereq = 1;
+ strbuf_remove(&buf, 0, 1);
+ }
+ strbuf_rtrim(&buf);
+
+ /*
+ * Tip lines have object name, SP, and refname.
+ * Prerequisites have object name that is optionally
+ * followed by SP and subject line.
+ */
+ if (get_sha1_hex(buf.buf, sha1) ||
+ (buf.len > 40 && !isspace(buf.buf[40])) ||
+ (!is_prereq && buf.len <= 40)) {
+ if (report_path)
+ error(_("unrecognized header: %s%s (%d)"),
+ (is_prereq ? "-" : ""), buf.buf, (int)buf.len);
+ status = -1;
+ break;
+ } else {
+ if (is_prereq)
+ add_to_ref_list(sha1, "", &header->prerequisites);
+ else
+ add_to_ref_list(sha1, buf.buf + 41, &header->references);
+ }
+ }
+
+ abort:
+ if (status) {
+ close(fd);
+ fd = -1;
+ }
+ strbuf_release(&buf);
+ return fd;
+}
+
+int read_bundle_header(const char *path, struct bundle_header *header)
+{
+ int fd = open(path, O_RDONLY);
+
+ if (fd < 0)
+ return error(_("could not open '%s'"), path);
+ return parse_bundle_header(fd, header, path);
+}
+
+int is_bundle(const char *path, int quiet)
+{
+ struct bundle_header header;
+ int fd = open(path, O_RDONLY);
+
+ if (fd < 0)
+ return 0;
+ memset(&header, 0, sizeof(header));
+ fd = parse_bundle_header(fd, &header, quiet ? NULL : path);
+ if (fd >= 0)
+ close(fd);
+ return (fd >= 0);
+}
+
+static int list_refs(struct ref_list *r, int argc, const char **argv)
+{
+ int i;
+
+ for (i = 0; i < r->nr; i++) {
+ if (argc > 1) {
+ int j;
+ for (j = 1; j < argc; j++)
+ if (!strcmp(r->list[i].name, argv[j]))
+ break;
+ if (j == argc)
+ continue;
+ }
+ printf("%s %s\n", sha1_to_hex(r->list[i].sha1),
+ r->list[i].name);
+ }
+ return 0;
+}
+
+/* Remember to update object flag allocation in object.h */
+#define PREREQ_MARK (1u<<16)
+
+int verify_bundle(struct bundle_header *header, int verbose)
+{
+ /*
+ * Do fast check, then if any prereqs are missing then go line by line
+ * to be verbose about the errors
+ */
+ struct ref_list *p = &header->prerequisites;
+ struct rev_info revs;
+ const char *argv[] = {NULL, "--all", NULL};
+ struct object_array refs;
+ struct commit *commit;
+ int i, ret = 0, req_nr;
+ const char *message = _("Repository lacks these prerequisite commits:");
+
+ init_revisions(&revs, NULL);
+ for (i = 0; i < p->nr; i++) {
+ struct ref_list_entry *e = p->list + i;
+ struct object *o = parse_object(e->sha1);
+ if (o) {
+ o->flags |= PREREQ_MARK;
+ add_pending_object(&revs, o, e->name);
+ continue;
+ }
+ if (++ret == 1)
+ error("%s", message);
+ error("%s %s", sha1_to_hex(e->sha1), e->name);
+ }
+ if (revs.pending.nr != p->nr)
+ return ret;
+ req_nr = revs.pending.nr;
+ setup_revisions(2, argv, &revs, NULL);
+
+ refs = revs.pending;
+ revs.leak_pending = 1;
+
+ if (prepare_revision_walk(&revs))
+ die(_("revision walk setup failed"));
+
+ i = req_nr;
+ while (i && (commit = get_revision(&revs)))
+ if (commit->object.flags & PREREQ_MARK)
+ i--;
+
+ for (i = 0; i < req_nr; i++)
+ if (!(refs.objects[i].item->flags & SHOWN)) {
+ if (++ret == 1)
+ error("%s", message);
+ error("%s %s", oid_to_hex(&refs.objects[i].item->oid),
+ refs.objects[i].name);
+ }
+
+ clear_commit_marks_for_object_array(&refs, ALL_REV_FLAGS);
+ free(refs.objects);
+
+ if (verbose) {
+ struct ref_list *r;
+
+ r = &header->references;
+ printf_ln(Q_("The bundle contains this ref:",
+ "The bundle contains these %d refs:",
+ r->nr),
+ r->nr);
+ list_refs(r, 0, NULL);
+ r = &header->prerequisites;
+ if (!r->nr) {
+ printf_ln(_("The bundle records a complete history."));
+ } else {
+ printf_ln(Q_("The bundle requires this ref:",
+ "The bundle requires these %d refs:",
+ r->nr),
+ r->nr);
+ list_refs(r, 0, NULL);
+ }
+ }
+ return ret;
+}
+
+int list_bundle_refs(struct bundle_header *header, int argc, const char **argv)
+{
+ return list_refs(&header->references, argc, argv);
+}
+
+static int is_tag_in_date_range(struct object *tag, struct rev_info *revs)
+{
+ unsigned long size;
+ enum object_type type;
+ char *buf = NULL, *line, *lineend;
+ unsigned long date;
+ int result = 1;
+
+ if (revs->max_age == -1 && revs->min_age == -1)
+ goto out;
+
+ buf = read_sha1_file(tag->oid.hash, &type, &size);
+ if (!buf)
+ goto out;
+ line = memmem(buf, size, "\ntagger ", 8);
+ if (!line++)
+ goto out;
+ lineend = memchr(line, '\n', buf + size - line);
+ line = memchr(line, '>', lineend ? lineend - line : buf + size - line);
+ if (!line++)
+ goto out;
+ date = strtoul(line, NULL, 10);
+ result = (revs->max_age == -1 || revs->max_age < date) &&
+ (revs->min_age == -1 || revs->min_age > date);
+out:
+ free(buf);
+ return result;
+}
+
+
+/* Write the pack data to bundle_fd, then close it if it is > 1. */
+static int write_pack_data(int bundle_fd, struct rev_info *revs)
+{
+ struct child_process pack_objects = CHILD_PROCESS_INIT;
+ int i;
+
+ argv_array_pushl(&pack_objects.args,
+ "pack-objects", "--all-progress-implied",
+ "--stdout", "--thin", "--delta-base-offset",
+ NULL);
+ pack_objects.in = -1;
+ pack_objects.out = bundle_fd;
+ pack_objects.git_cmd = 1;
+ if (start_command(&pack_objects))
+ return error(_("Could not spawn pack-objects"));
+
+ for (i = 0; i < revs->pending.nr; i++) {
+ struct object *object = revs->pending.objects[i].item;
+ if (object->flags & UNINTERESTING)
+ write_or_die(pack_objects.in, "^", 1);
+ write_or_die(pack_objects.in, oid_to_hex(&object->oid), GIT_SHA1_HEXSZ);
+ write_or_die(pack_objects.in, "\n", 1);
+ }
+ close(pack_objects.in);
+ if (finish_command(&pack_objects))
+ return error(_("pack-objects died"));
+ return 0;
+}
+
+static int compute_and_write_prerequisites(int bundle_fd,
+ struct rev_info *revs,
+ int argc, const char **argv)
+{
+ struct child_process rls = CHILD_PROCESS_INIT;
+ struct strbuf buf = STRBUF_INIT;
+ FILE *rls_fout;
+ int i;
+
+ argv_array_pushl(&rls.args,
+ "rev-list", "--boundary", "--pretty=oneline",
+ NULL);
+ for (i = 1; i < argc; i++)
+ argv_array_push(&rls.args, argv[i]);
+ rls.out = -1;
+ rls.git_cmd = 1;
+ if (start_command(&rls))
+ return -1;
+ rls_fout = xfdopen(rls.out, "r");
+ while (strbuf_getwholeline(&buf, rls_fout, '\n') != EOF) {
+ unsigned char sha1[20];
+ if (buf.len > 0 && buf.buf[0] == '-') {
+ write_or_die(bundle_fd, buf.buf, buf.len);
+ if (!get_sha1_hex(buf.buf + 1, sha1)) {
+ struct object *object = parse_object_or_die(sha1, buf.buf);
+ object->flags |= UNINTERESTING;
+ add_pending_object(revs, object, buf.buf);
+ }
+ } else if (!get_sha1_hex(buf.buf, sha1)) {
+ struct object *object = parse_object_or_die(sha1, buf.buf);
+ object->flags |= SHOWN;
+ }
+ }
+ strbuf_release(&buf);
+ fclose(rls_fout);
+ if (finish_command(&rls))
+ return error(_("rev-list died"));
+ return 0;
+}
+
+/*
+ * Write out bundle refs based on the tips already
+ * parsed into revs.pending. As a side effect, may
+ * manipulate revs.pending to include additional
+ * necessary objects (like tags).
+ *
+ * Returns the number of refs written, or negative
+ * on error.
+ */
+static int write_bundle_refs(int bundle_fd, struct rev_info *revs)
+{
+ int i;
+ int ref_count = 0;
+
+ for (i = 0; i < revs->pending.nr; i++) {
+ struct object_array_entry *e = revs->pending.objects + i;
+ struct object_id oid;
+ char *ref;
+ const char *display_ref;
+ int flag;
+
+ if (e->item->flags & UNINTERESTING)
+ continue;
+ if (dwim_ref(e->name, strlen(e->name), oid.hash, &ref) != 1)
+ goto skip_write_ref;
+ if (read_ref_full(e->name, RESOLVE_REF_READING, oid.hash, &flag))
+ flag = 0;
+ display_ref = (flag & REF_ISSYMREF) ? e->name : ref;
+
+ if (e->item->type == OBJ_TAG &&
+ !is_tag_in_date_range(e->item, revs)) {
+ e->item->flags |= UNINTERESTING;
+ goto skip_write_ref;
+ }
+
+ /*
+ * Make sure the refs we wrote out is correct; --max-count and
+ * other limiting options could have prevented all the tips
+ * from getting output.
+ *
+ * Non commit objects such as tags and blobs do not have
+ * this issue as they are not affected by those extra
+ * constraints.
+ */
+ if (!(e->item->flags & SHOWN) && e->item->type == OBJ_COMMIT) {
+ warning(_("ref '%s' is excluded by the rev-list options"),
+ e->name);
+ goto skip_write_ref;
+ }
+ /*
+ * If you run "git bundle create bndl v1.0..v2.0", the
+ * name of the positive ref is "v2.0" but that is the
+ * commit that is referenced by the tag, and not the tag
+ * itself.
+ */
+ if (oidcmp(&oid, &e->item->oid)) {
+ /*
+ * Is this the positive end of a range expressed
+ * in terms of a tag (e.g. v2.0 from the range
+ * "v1.0..v2.0")?
+ */
+ struct commit *one = lookup_commit_reference(oid.hash);
+ struct object *obj;
+
+ if (e->item == &(one->object)) {
+ /*
+ * Need to include e->name as an
+ * independent ref to the pack-objects
+ * input, so that the tag is included
+ * in the output; otherwise we would
+ * end up triggering "empty bundle"
+ * error.
+ */
+ obj = parse_object_or_die(oid.hash, e->name);
+ obj->flags |= SHOWN;
+ add_pending_object(revs, obj, e->name);
+ }
+ goto skip_write_ref;
+ }
+
+ ref_count++;
+ write_or_die(bundle_fd, oid_to_hex(&e->item->oid), 40);
+ write_or_die(bundle_fd, " ", 1);
+ write_or_die(bundle_fd, display_ref, strlen(display_ref));
+ write_or_die(bundle_fd, "\n", 1);
+ skip_write_ref:
+ free(ref);
+ }
+
+ /* end header */
+ write_or_die(bundle_fd, "\n", 1);
+ return ref_count;
+}
+
+int create_bundle(struct bundle_header *header, const char *path,
+ int argc, const char **argv)
+{
+ static struct lock_file lock;
+ int bundle_fd = -1;
+ int bundle_to_stdout;
+ int ref_count = 0;
+ struct rev_info revs;
+
+ bundle_to_stdout = !strcmp(path, "-");
+ if (bundle_to_stdout)
+ bundle_fd = 1;
+ else {
+ bundle_fd = hold_lock_file_for_update(&lock, path,
+ LOCK_DIE_ON_ERROR);
+
+ /*
+ * write_pack_data() will close the fd passed to it,
+ * but commit_lock_file() will also try to close the
+ * lockfile's fd. So make a copy of the file
+ * descriptor to avoid trying to close it twice.
+ */
+ bundle_fd = dup(bundle_fd);
+ if (bundle_fd < 0)
+ die_errno("unable to dup file descriptor");
+ }
+
+ /* write signature */
+ write_or_die(bundle_fd, bundle_signature, strlen(bundle_signature));
+
+ /* init revs to list objects for pack-objects later */
+ save_commit_buffer = 0;
+ init_revisions(&revs, NULL);
+
+ /* write prerequisites */
+ if (compute_and_write_prerequisites(bundle_fd, &revs, argc, argv))
+ goto err;
+
+ argc = setup_revisions(argc, argv, &revs, NULL);
+
+ if (argc > 1) {
+ error(_("unrecognized argument: %s"), argv[1]);
+ goto err;
+ }
+
+ object_array_remove_duplicates(&revs.pending);
+
+ ref_count = write_bundle_refs(bundle_fd, &revs);
+ if (!ref_count)
+ die(_("Refusing to create empty bundle."));
+ else if (ref_count < 0)
+ goto err;
+
+ /* write pack */
+ if (write_pack_data(bundle_fd, &revs)) {
+ bundle_fd = -1; /* already closed by the above call */
+ goto err;
+ }
+
+ if (!bundle_to_stdout) {
+ if (commit_lock_file(&lock))
+ die_errno(_("cannot create '%s'"), path);
+ }
+ return 0;
+err:
+ if (!bundle_to_stdout) {
+ if (0 <= bundle_fd)
+ close(bundle_fd);
+ rollback_lock_file(&lock);
+ }
+ return -1;
+}
+
+int unbundle(struct bundle_header *header, int bundle_fd, int flags)
+{
+ const char *argv_index_pack[] = {"index-pack",
+ "--fix-thin", "--stdin", NULL, NULL};
+ struct child_process ip = CHILD_PROCESS_INIT;
+
+ if (flags & BUNDLE_VERBOSE)
+ argv_index_pack[3] = "-v";
+
+ if (verify_bundle(header, 0))
+ return -1;
+ ip.argv = argv_index_pack;
+ ip.in = bundle_fd;
+ ip.no_stdout = 1;
+ ip.git_cmd = 1;
+ if (run_command(&ip))
+ return error(_("index-pack died"));
+ return 0;
+}
generated by cgit v0.10.2-6-g49f6 at 2024-04-16 16:44:02 (GMT)