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46efd2d93c
This fixes a problem reported by Randal Schwartz: >I finally tracked down all the (albeit inconsequential) errors I was getting >on both OpenBSD and OSX. It's the warn() function in usage.c. There's >warn(3) in BSD-style distros. It'd take a "great rename" to change it, but if >someone with better C skills than I have could do that, my linker and I would >appreciate it. It was annoying to me, too, when I was doing some mergetool testing on Mac OS X, so here's a fix. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Cc: "Randal L. Schwartz" <merlyn@stonehenge.com> Signed-off-by: Junio C Hamano <junkio@cox.net>
381 lines
9.8 KiB
C
381 lines
9.8 KiB
C
#include "cache.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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/*
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* Basic handler for bundle files to connect repositories via sneakernet.
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* Invocation must include action.
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* This function can create a bundle or provide information on an existing
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* bundle supporting git-fetch, git-pull, and git-ls-remote
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*/
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static const char *bundle_usage="git-bundle (create <bundle> <git-rev-list args> | verify <bundle> | list-heads <bundle> [refname]... | unbundle <bundle> [refname]... )";
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static const char bundle_signature[] = "# v2 git bundle\n";
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struct ref_list {
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unsigned int nr, alloc;
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struct ref_list_entry {
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unsigned char sha1[20];
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char *name;
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} *list;
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};
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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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struct bundle_header {
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struct ref_list prerequisites;
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struct ref_list references;
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};
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/* this function returns the length of the string */
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static int read_string(int fd, char *buffer, int size)
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{
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int i;
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for (i = 0; i < size - 1; i++) {
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int count = xread(fd, buffer + i, 1);
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if (count < 0)
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return error("Read error: %s", strerror(errno));
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if (count == 0) {
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i--;
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break;
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}
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if (buffer[i] == '\n')
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break;
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}
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buffer[i + 1] = '\0';
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return i + 1;
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}
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/* returns an fd */
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static int read_header(const char *path, struct bundle_header *header) {
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char buffer[1024];
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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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if (read_string(fd, buffer, sizeof(buffer)) < 0 ||
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strcmp(buffer, bundle_signature)) {
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close(fd);
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return error("'%s' does not look like a v2 bundle file", path);
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}
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while (read_string(fd, buffer, sizeof(buffer)) > 0
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&& buffer[0] != '\n') {
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int is_prereq = buffer[0] == '-';
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int offset = is_prereq ? 1 : 0;
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int len = strlen(buffer);
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unsigned char sha1[20];
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struct ref_list *list = is_prereq ? &header->prerequisites
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: &header->references;
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char delim;
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if (buffer[len - 1] == '\n')
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buffer[len - 1] = '\0';
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if (get_sha1_hex(buffer + offset, sha1)) {
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warning("unrecognized header: %s", buffer);
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continue;
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}
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delim = buffer[40 + offset];
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if (!isspace(delim) && (delim != '\0' || !is_prereq))
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die ("invalid header: %s", buffer);
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add_to_ref_list(sha1, isspace(delim) ?
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buffer + 41 + offset : "", list);
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}
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return fd;
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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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static 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"};
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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(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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memset(&refs, 0, sizeof(struct object_array));
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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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add_object_array(e->item, e->name, &refs);
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}
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prepare_revision_walk(&revs);
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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(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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for (i = 0; i < refs.nr; i++)
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clear_commit_marks((struct commit *)refs.objects[i].item, -1);
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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("The bundle contains %d ref%s\n",
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r->nr, (1 < r->nr) ? "s" : "");
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list_refs(r, 0, NULL);
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r = &header->prerequisites;
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printf("The bundle requires these %d ref%s\n",
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r->nr, (1 < r->nr) ? "s" : "");
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list_refs(r, 0, NULL);
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}
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return ret;
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}
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static int list_heads(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 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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int bundle_fd = -1;
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const char **argv_boundary = xmalloc((argc + 4) * sizeof(const char *));
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const char **argv_pack = xmalloc(5 * sizeof(const char *));
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int i, ref_count = 0;
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char buffer[1024];
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struct rev_info revs;
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struct child_process rls;
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bundle_fd = (!strcmp(path, "-") ? 1 :
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open(path, O_CREAT | O_EXCL | O_WRONLY, 0666));
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if (bundle_fd < 0)
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return error("Could not create '%s': %s", path, strerror(errno));
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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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while ((i = read_string(rls.out, buffer, sizeof(buffer))) > 0) {
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unsigned char sha1[20];
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if (buffer[0] == '-') {
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write_or_die(bundle_fd, buffer, i);
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if (!get_sha1_hex(buffer + 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, buffer);
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}
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} else if (!get_sha1_hex(buffer, 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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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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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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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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/*
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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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if (!(e->item->flags & SHOWN)) {
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warning("ref '%s' is excluded by the rev-list options",
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e->name);
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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, ref, strlen(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";
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argv_pack[2] = "--stdout";
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argv_pack[3] = "--thin";
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argv_pack[4] = 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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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(rls.in, "^", 1);
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write(rls.in, sha1_to_hex(object->sha1), 40);
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write(rls.in, "\n", 1);
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}
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if (finish_command(&rls))
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return error ("pack-objects died");
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return 0;
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}
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static int unbundle(struct bundle_header *header, int bundle_fd,
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int argc, const char **argv)
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{
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const char *argv_index_pack[] = {"index-pack",
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"--fix-thin", "--stdin", NULL};
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struct child_process ip;
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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 list_heads(header, argc, argv);
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}
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int cmd_bundle(int argc, const char **argv, const char *prefix)
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{
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struct bundle_header header;
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int nongit = 0;
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const char *cmd, *bundle_file;
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int bundle_fd = -1;
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char buffer[PATH_MAX];
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if (argc < 3)
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usage(bundle_usage);
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cmd = argv[1];
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bundle_file = argv[2];
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argc -= 2;
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argv += 2;
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prefix = setup_git_directory_gently(&nongit);
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if (prefix && bundle_file[0] != '/') {
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snprintf(buffer, sizeof(buffer), "%s/%s", prefix, bundle_file);
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bundle_file = buffer;
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}
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memset(&header, 0, sizeof(header));
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if (strcmp(cmd, "create") &&
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(bundle_fd = read_header(bundle_file, &header)) < 0)
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return 1;
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if (!strcmp(cmd, "verify")) {
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close(bundle_fd);
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if (verify_bundle(&header, 1))
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return 1;
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fprintf(stderr, "%s is okay\n", bundle_file);
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return 0;
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}
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if (!strcmp(cmd, "list-heads")) {
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close(bundle_fd);
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return !!list_heads(&header, argc, argv);
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}
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if (!strcmp(cmd, "create")) {
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if (nongit)
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die("Need a repository to create a bundle.");
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return !!create_bundle(&header, bundle_file, argc, argv);
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} else if (!strcmp(cmd, "unbundle")) {
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if (nongit)
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die("Need a repository to unbundle.");
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return !!unbundle(&header, bundle_fd, argc, argv);
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} else
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usage(bundle_usage);
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}
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