mirror of
https://github.com/git/git.git
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8c3710fd30
A bundle that records a complete history without prerequiste is a useful way to sneakernet the sources of your configuration files under your home directory, etc. E.g. $ GIT_DIR=/srv/git/homesrc.git git bundle create x.bndl HEAD master Running "git bundle verify" on such a "complete" bundle, however, gives somewhat a funny output. $ git bundle verify x.bndl The bundle contains 2 refs b2611f37ebc7ed6435a72d77fbc5f8b48a7d7146 HEAD b2611f37ebc7ed6435a72d77fbc5f8b48a7d7146 refs/heads/master The bundle requires these 0 refs x.bndl is okay Reword "requires these 0 refs" to say "The bundle records a complete history" instead. Signed-off-by: Junio C Hamano <gitster@pobox.com>
444 lines
11 KiB
C
444 lines
11 KiB
C
#include "cache.h"
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#include "bundle.h"
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#include "object.h"
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#include "commit.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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#include "refs.h"
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static const char bundle_signature[] = "# v2 git bundle\n";
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static void add_to_ref_list(const unsigned char *sha1, const char *name,
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struct ref_list *list)
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{
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if (list->nr + 1 >= list->alloc) {
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list->alloc = alloc_nr(list->nr + 1);
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list->list = xrealloc(list->list,
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list->alloc * sizeof(list->list[0]));
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}
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memcpy(list->list[list->nr].sha1, sha1, 20);
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list->list[list->nr].name = xstrdup(name);
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list->nr++;
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}
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static int parse_bundle_header(int fd, struct bundle_header *header,
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const char *report_path)
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{
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struct strbuf buf = STRBUF_INIT;
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int status = 0;
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/* The bundle header begins with the signature */
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if (strbuf_getwholeline_fd(&buf, fd, '\n') ||
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strcmp(buf.buf, bundle_signature)) {
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if (report_path)
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error(_("'%s' does not look like a v2 bundle file"),
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report_path);
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status = -1;
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goto abort;
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}
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/* The bundle header ends with an empty line */
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while (!strbuf_getwholeline_fd(&buf, fd, '\n') &&
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buf.len && buf.buf[0] != '\n') {
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unsigned char sha1[20];
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int is_prereq = 0;
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if (*buf.buf == '-') {
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is_prereq = 1;
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strbuf_remove(&buf, 0, 1);
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}
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strbuf_rtrim(&buf);
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/*
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* Tip lines have object name, SP, and refname.
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* Prerequisites have object name that is optionally
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* followed by SP and subject line.
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*/
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if (get_sha1_hex(buf.buf, sha1) ||
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(40 <= buf.len && !isspace(buf.buf[40])) ||
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(!is_prereq && buf.len <= 40)) {
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if (report_path)
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error(_("unrecognized header: %s%s (%d)"),
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(is_prereq ? "-" : ""), buf.buf, (int)buf.len);
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status = -1;
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break;
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} else {
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if (is_prereq)
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add_to_ref_list(sha1, "", &header->prerequisites);
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else
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add_to_ref_list(sha1, buf.buf + 41, &header->references);
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}
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}
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abort:
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if (status) {
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close(fd);
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fd = -1;
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}
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strbuf_release(&buf);
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return fd;
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}
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int read_bundle_header(const char *path, struct bundle_header *header)
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{
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int fd = open(path, O_RDONLY);
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if (fd < 0)
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return error(_("could not open '%s'"), path);
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return parse_bundle_header(fd, header, path);
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}
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int is_bundle(const char *path, int quiet)
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{
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struct bundle_header header;
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int fd = open(path, O_RDONLY);
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if (fd < 0)
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return 0;
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memset(&header, 0, sizeof(header));
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fd = parse_bundle_header(fd, &header, quiet ? NULL : path);
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if (fd >= 0)
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close(fd);
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return (fd >= 0);
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}
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static int list_refs(struct ref_list *r, int argc, const char **argv)
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{
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int i;
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for (i = 0; i < r->nr; i++) {
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if (argc > 1) {
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int j;
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for (j = 1; j < argc; j++)
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if (!strcmp(r->list[i].name, argv[j]))
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break;
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if (j == argc)
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continue;
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}
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printf("%s %s\n", sha1_to_hex(r->list[i].sha1),
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r->list[i].name);
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}
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return 0;
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}
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#define PREREQ_MARK (1u<<16)
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int verify_bundle(struct bundle_header *header, int verbose)
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{
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/*
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* Do fast check, then if any prereqs are missing then go line by line
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* to be verbose about the errors
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*/
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struct ref_list *p = &header->prerequisites;
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struct rev_info revs;
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const char *argv[] = {NULL, "--all", NULL};
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struct object_array refs;
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struct commit *commit;
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int i, ret = 0, req_nr;
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const char *message = _("Repository lacks these prerequisite commits:");
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init_revisions(&revs, NULL);
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for (i = 0; i < p->nr; i++) {
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struct ref_list_entry *e = p->list + i;
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struct object *o = parse_object(e->sha1);
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if (o) {
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o->flags |= PREREQ_MARK;
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add_pending_object(&revs, o, e->name);
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continue;
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}
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if (++ret == 1)
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error("%s", message);
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error("%s %s", sha1_to_hex(e->sha1), e->name);
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}
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if (revs.pending.nr != p->nr)
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return ret;
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req_nr = revs.pending.nr;
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setup_revisions(2, argv, &revs, NULL);
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refs = revs.pending;
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revs.leak_pending = 1;
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if (prepare_revision_walk(&revs))
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die(_("revision walk setup failed"));
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i = req_nr;
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while (i && (commit = get_revision(&revs)))
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if (commit->object.flags & PREREQ_MARK)
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i--;
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for (i = 0; i < req_nr; i++)
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if (!(refs.objects[i].item->flags & SHOWN)) {
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if (++ret == 1)
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error("%s", message);
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error("%s %s", sha1_to_hex(refs.objects[i].item->sha1),
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refs.objects[i].name);
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}
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clear_commit_marks_for_object_array(&refs, ALL_REV_FLAGS);
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free(refs.objects);
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if (verbose) {
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struct ref_list *r;
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r = &header->references;
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printf_ln(Q_("The bundle contains %d ref",
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"The bundle contains %d refs",
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r->nr),
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r->nr);
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list_refs(r, 0, NULL);
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if (!r->nr) {
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printf_ln(_("The bundle records a complete history."));
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} else {
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r = &header->prerequisites;
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printf_ln(Q_("The bundle requires this ref",
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"The bundle requires these %d refs",
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r->nr),
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r->nr);
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list_refs(r, 0, NULL);
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}
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}
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return ret;
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}
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int list_bundle_refs(struct bundle_header *header, int argc, const char **argv)
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{
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return list_refs(&header->references, argc, argv);
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}
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static int is_tag_in_date_range(struct object *tag, struct rev_info *revs)
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{
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unsigned long size;
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enum object_type type;
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char *buf, *line, *lineend;
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unsigned long date;
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if (revs->max_age == -1 && revs->min_age == -1)
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return 1;
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buf = read_sha1_file(tag->sha1, &type, &size);
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if (!buf)
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return 1;
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line = memmem(buf, size, "\ntagger ", 8);
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if (!line++)
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return 1;
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lineend = memchr(line, buf + size - line, '\n');
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line = memchr(line, lineend ? lineend - line : buf + size - line, '>');
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if (!line++)
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return 1;
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date = strtoul(line, NULL, 10);
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free(buf);
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return (revs->max_age == -1 || revs->max_age < date) &&
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(revs->min_age == -1 || revs->min_age > date);
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}
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int create_bundle(struct bundle_header *header, const char *path,
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int argc, const char **argv)
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{
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static struct lock_file lock;
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int bundle_fd = -1;
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int bundle_to_stdout;
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const char **argv_boundary = xmalloc((argc + 4) * sizeof(const char *));
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const char **argv_pack = xmalloc(6 * sizeof(const char *));
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int i, ref_count = 0;
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struct strbuf buf = STRBUF_INIT;
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struct rev_info revs;
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struct child_process rls;
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FILE *rls_fout;
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bundle_to_stdout = !strcmp(path, "-");
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if (bundle_to_stdout)
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bundle_fd = 1;
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else
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bundle_fd = hold_lock_file_for_update(&lock, path,
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LOCK_DIE_ON_ERROR);
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/* write signature */
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write_or_die(bundle_fd, bundle_signature, strlen(bundle_signature));
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/* init revs to list objects for pack-objects later */
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save_commit_buffer = 0;
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init_revisions(&revs, NULL);
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/* write prerequisites */
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memcpy(argv_boundary + 3, argv + 1, argc * sizeof(const char *));
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argv_boundary[0] = "rev-list";
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argv_boundary[1] = "--boundary";
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argv_boundary[2] = "--pretty=oneline";
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argv_boundary[argc + 2] = NULL;
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memset(&rls, 0, sizeof(rls));
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rls.argv = argv_boundary;
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rls.out = -1;
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rls.git_cmd = 1;
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if (start_command(&rls))
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return -1;
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rls_fout = xfdopen(rls.out, "r");
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while (strbuf_getwholeline(&buf, rls_fout, '\n') != EOF) {
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unsigned char sha1[20];
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if (buf.len > 0 && buf.buf[0] == '-') {
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write_or_die(bundle_fd, buf.buf, buf.len);
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if (!get_sha1_hex(buf.buf + 1, sha1)) {
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struct object *object = parse_object(sha1);
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object->flags |= UNINTERESTING;
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add_pending_object(&revs, object, xstrdup(buf.buf));
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}
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} else if (!get_sha1_hex(buf.buf, sha1)) {
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struct object *object = parse_object(sha1);
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object->flags |= SHOWN;
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}
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}
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strbuf_release(&buf);
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fclose(rls_fout);
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if (finish_command(&rls))
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return error(_("rev-list died"));
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/* write references */
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argc = setup_revisions(argc, argv, &revs, NULL);
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if (argc > 1)
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return error(_("unrecognized argument: %s"), argv[1]);
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object_array_remove_duplicates(&revs.pending);
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for (i = 0; i < revs.pending.nr; i++) {
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struct object_array_entry *e = revs.pending.objects + i;
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unsigned char sha1[20];
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char *ref;
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const char *display_ref;
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int flag;
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if (e->item->flags & UNINTERESTING)
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continue;
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if (dwim_ref(e->name, strlen(e->name), sha1, &ref) != 1)
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continue;
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if (read_ref_full(e->name, sha1, 1, &flag))
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flag = 0;
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display_ref = (flag & REF_ISSYMREF) ? e->name : ref;
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if (e->item->type == OBJ_TAG &&
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!is_tag_in_date_range(e->item, &revs)) {
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e->item->flags |= UNINTERESTING;
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continue;
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}
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/*
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* Make sure the refs we wrote out is correct; --max-count and
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* other limiting options could have prevented all the tips
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* from getting output.
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*
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* Non commit objects such as tags and blobs do not have
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* this issue as they are not affected by those extra
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* constraints.
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*/
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if (!(e->item->flags & SHOWN) && e->item->type == OBJ_COMMIT) {
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warning(_("ref '%s' is excluded by the rev-list options"),
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e->name);
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free(ref);
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continue;
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}
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/*
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* If you run "git bundle create bndl v1.0..v2.0", the
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* name of the positive ref is "v2.0" but that is the
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* commit that is referenced by the tag, and not the tag
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* itself.
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*/
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if (hashcmp(sha1, e->item->sha1)) {
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/*
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* Is this the positive end of a range expressed
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* in terms of a tag (e.g. v2.0 from the range
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* "v1.0..v2.0")?
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*/
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struct commit *one = lookup_commit_reference(sha1);
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struct object *obj;
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if (e->item == &(one->object)) {
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/*
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* Need to include e->name as an
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* independent ref to the pack-objects
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* input, so that the tag is included
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* in the output; otherwise we would
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* end up triggering "empty bundle"
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* error.
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*/
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obj = parse_object(sha1);
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obj->flags |= SHOWN;
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add_pending_object(&revs, obj, e->name);
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}
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free(ref);
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continue;
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}
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ref_count++;
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write_or_die(bundle_fd, sha1_to_hex(e->item->sha1), 40);
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write_or_die(bundle_fd, " ", 1);
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write_or_die(bundle_fd, display_ref, strlen(display_ref));
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write_or_die(bundle_fd, "\n", 1);
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free(ref);
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}
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if (!ref_count)
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die(_("Refusing to create empty bundle."));
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/* end header */
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write_or_die(bundle_fd, "\n", 1);
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/* write pack */
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argv_pack[0] = "pack-objects";
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argv_pack[1] = "--all-progress-implied";
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argv_pack[2] = "--stdout";
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argv_pack[3] = "--thin";
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argv_pack[4] = "--delta-base-offset";
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argv_pack[5] = NULL;
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memset(&rls, 0, sizeof(rls));
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rls.argv = argv_pack;
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rls.in = -1;
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rls.out = bundle_fd;
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rls.git_cmd = 1;
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if (start_command(&rls))
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return error(_("Could not spawn pack-objects"));
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/*
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* start_command closed bundle_fd if it was > 1
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* so set the lock fd to -1 so commit_lock_file()
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* won't fail trying to close it.
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*/
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lock.fd = -1;
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for (i = 0; i < revs.pending.nr; i++) {
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struct object *object = revs.pending.objects[i].item;
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if (object->flags & UNINTERESTING)
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write_or_die(rls.in, "^", 1);
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write_or_die(rls.in, sha1_to_hex(object->sha1), 40);
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write_or_die(rls.in, "\n", 1);
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}
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close(rls.in);
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if (finish_command(&rls))
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return error(_("pack-objects died"));
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if (!bundle_to_stdout) {
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if (commit_lock_file(&lock))
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die_errno(_("cannot create '%s'"), path);
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}
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return 0;
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}
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int unbundle(struct bundle_header *header, int bundle_fd, int flags)
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{
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const char *argv_index_pack[] = {"index-pack",
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"--fix-thin", "--stdin", NULL, NULL};
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struct child_process ip;
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if (flags & BUNDLE_VERBOSE)
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argv_index_pack[3] = "-v";
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if (verify_bundle(header, 0))
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return -1;
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memset(&ip, 0, sizeof(ip));
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ip.argv = argv_index_pack;
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ip.in = bundle_fd;
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ip.no_stdout = 1;
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ip.git_cmd = 1;
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if (run_command(&ip))
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return error(_("index-pack died"));
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return 0;
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}
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