/* * "git fast-export" builtin command * * Copyright (C) 2007 Johannes E. Schindelin */ #include "builtin.h" #include "cache.h" #include "commit.h" #include "object.h" #include "tag.h" #include "diff.h" #include "diffcore.h" #include "log-tree.h" #include "revision.h" #include "decorate.h" #include "path-list.h" #include "utf8.h" #include "parse-options.h" static const char *fast_export_usage[] = { "git-fast-export [rev-list-opts]", NULL }; static int progress; static enum { VERBATIM, WARN, STRIP, ABORT } signed_tag_mode = ABORT; static int parse_opt_signed_tag_mode(const struct option *opt, const char *arg, int unset) { if (unset || !strcmp(arg, "abort")) signed_tag_mode = ABORT; else if (!strcmp(arg, "verbatim") || !strcmp(arg, "ignore")) signed_tag_mode = VERBATIM; else if (!strcmp(arg, "warn")) signed_tag_mode = WARN; else if (!strcmp(arg, "strip")) signed_tag_mode = STRIP; else return error("Unknown signed-tag mode: %s", arg); return 0; } static struct decoration idnums; static uint32_t last_idnum; static int has_unshown_parent(struct commit *commit) { struct commit_list *parent; for (parent = commit->parents; parent; parent = parent->next) if (!(parent->item->object.flags & SHOWN) && !(parent->item->object.flags & UNINTERESTING)) return 1; return 0; } /* Since intptr_t is C99, we do not use it here */ static void mark_object(struct object *object) { last_idnum++; add_decoration(&idnums, object, ((uint32_t *)NULL) + last_idnum); } static int get_object_mark(struct object *object) { void *decoration = lookup_decoration(&idnums, object); if (!decoration) return 0; return (uint32_t *)decoration - (uint32_t *)NULL; } static void show_progress(void) { static int counter = 0; if (!progress) return; if ((++counter % progress) == 0) printf("progress %d objects\n", counter); } static void handle_object(const unsigned char *sha1) { unsigned long size; enum object_type type; char *buf; struct object *object; if (is_null_sha1(sha1)) return; object = parse_object(sha1); if (!object) die ("Could not read blob %s", sha1_to_hex(sha1)); if (object->flags & SHOWN) return; buf = read_sha1_file(sha1, &type, &size); if (!buf) die ("Could not read blob %s", sha1_to_hex(sha1)); mark_object(object); printf("blob\nmark :%d\ndata %lu\n", last_idnum, size); if (size && fwrite(buf, size, 1, stdout) != 1) die ("Could not write blob %s", sha1_to_hex(sha1)); printf("\n"); show_progress(); object->flags |= SHOWN; free(buf); } static void show_filemodify(struct diff_queue_struct *q, struct diff_options *options, void *data) { int i; for (i = 0; i < q->nr; i++) { struct diff_filespec *spec = q->queue[i]->two; if (is_null_sha1(spec->sha1)) printf("D %s\n", spec->path); else { struct object *object = lookup_object(spec->sha1); printf("M 0%06o :%d %s\n", spec->mode, get_object_mark(object), spec->path); } } } static const char *find_encoding(const char *begin, const char *end) { const char *needle = "\nencoding "; char *bol, *eol; bol = memmem(begin, end ? end - begin : strlen(begin), needle, strlen(needle)); if (!bol) return git_commit_encoding; bol += strlen(needle); eol = strchrnul(bol, '\n'); *eol = '\0'; return bol; } static void handle_commit(struct commit *commit, struct rev_info *rev) { int saved_output_format = rev->diffopt.output_format; const char *author, *author_end, *committer, *committer_end; const char *encoding, *message; char *reencoded = NULL; struct commit_list *p; int i; rev->diffopt.output_format = DIFF_FORMAT_CALLBACK; parse_commit(commit); author = strstr(commit->buffer, "\nauthor "); if (!author) die ("Could not find author in commit %s", sha1_to_hex(commit->object.sha1)); author++; author_end = strchrnul(author, '\n'); committer = strstr(author_end, "\ncommitter "); if (!committer) die ("Could not find committer in commit %s", sha1_to_hex(commit->object.sha1)); committer++; committer_end = strchrnul(committer, '\n'); message = strstr(committer_end, "\n\n"); encoding = find_encoding(committer_end, message); if (message) message += 2; if (commit->parents) { parse_commit(commit->parents->item); diff_tree_sha1(commit->parents->item->tree->object.sha1, commit->tree->object.sha1, "", &rev->diffopt); } else diff_root_tree_sha1(commit->tree->object.sha1, "", &rev->diffopt); for (i = 0; i < diff_queued_diff.nr; i++) handle_object(diff_queued_diff.queue[i]->two->sha1); mark_object(&commit->object); if (!is_encoding_utf8(encoding)) reencoded = reencode_string(message, "UTF-8", encoding); printf("commit %s\nmark :%d\n%.*s\n%.*s\ndata %u\n%s", (const char *)commit->util, last_idnum, (int)(author_end - author), author, (int)(committer_end - committer), committer, (unsigned)(reencoded ? strlen(reencoded) : message ? strlen(message) : 0), reencoded ? reencoded : message ? message : ""); if (reencoded) free(reencoded); for (i = 0, p = commit->parents; p; p = p->next) { int mark = get_object_mark(&p->item->object); if (!mark) continue; if (i == 0) printf("from :%d\n", mark); else if (i == 1) printf("merge :%d", mark); else printf(" :%d", mark); i++; } if (i > 1) printf("\n"); log_tree_diff_flush(rev); rev->diffopt.output_format = saved_output_format; printf("\n"); show_progress(); } static void handle_tail(struct object_array *commits, struct rev_info *revs) { struct commit *commit; while (commits->nr) { commit = (struct commit *)commits->objects[commits->nr - 1].item; if (has_unshown_parent(commit)) return; handle_commit(commit, revs); commits->nr--; } } static void handle_tag(const char *name, struct tag *tag) { unsigned long size; enum object_type type; char *buf; const char *tagger, *tagger_end, *message; size_t message_size = 0; buf = read_sha1_file(tag->object.sha1, &type, &size); if (!buf) die ("Could not read tag %s", sha1_to_hex(tag->object.sha1)); message = memmem(buf, size, "\n\n", 2); if (message) { message += 2; message_size = strlen(message); } tagger = memmem(buf, message ? message - buf : size, "\ntagger ", 8); if (!tagger) die ("No tagger for tag %s", sha1_to_hex(tag->object.sha1)); tagger++; tagger_end = strchrnul(tagger, '\n'); /* handle signed tags */ if (message) { const char *signature = strstr(message, "\n-----BEGIN PGP SIGNATURE-----\n"); if (signature) switch(signed_tag_mode) { case ABORT: die ("Encountered signed tag %s; use " "--signed-tag= to handle it.", sha1_to_hex(tag->object.sha1)); case WARN: warning ("Exporting signed tag %s", sha1_to_hex(tag->object.sha1)); /* fallthru */ case VERBATIM: break; case STRIP: message_size = signature + 1 - message; break; } } if (!prefixcmp(name, "refs/tags/")) name += 10; printf("tag %s\nfrom :%d\n%.*s\ndata %d\n%.*s\n", name, get_object_mark(tag->tagged), (int)(tagger_end - tagger), tagger, (int)message_size, (int)message_size, message ? message : ""); } static void get_tags_and_duplicates(struct object_array *pending, struct path_list *extra_refs) { struct tag *tag; int i; for (i = 0; i < pending->nr; i++) { struct object_array_entry *e = pending->objects + i; unsigned char sha1[20]; struct commit *commit = commit; char *full_name; if (dwim_ref(e->name, strlen(e->name), sha1, &full_name) != 1) continue; switch (e->item->type) { case OBJ_COMMIT: commit = (struct commit *)e->item; break; case OBJ_TAG: tag = (struct tag *)e->item; while (tag && tag->object.type == OBJ_TAG) { path_list_insert(full_name, extra_refs)->util = tag; tag = (struct tag *)tag->tagged; } if (!tag) die ("Tag %s points nowhere?", e->name); switch(tag->object.type) { case OBJ_COMMIT: commit = (struct commit *)tag; break; case OBJ_BLOB: handle_object(tag->object.sha1); continue; } break; default: die ("Unexpected object of type %s", typename(e->item->type)); } if (commit->util) /* more than one name for the same object */ path_list_insert(full_name, extra_refs)->util = commit; else commit->util = full_name; } } static void handle_tags_and_duplicates(struct path_list *extra_refs) { struct commit *commit; int i; for (i = extra_refs->nr - 1; i >= 0; i--) { const char *name = extra_refs->items[i].path; struct object *object = extra_refs->items[i].util; switch (object->type) { case OBJ_TAG: handle_tag(name, (struct tag *)object); break; case OBJ_COMMIT: /* create refs pointing to already seen commits */ commit = (struct commit *)object; printf("reset %s\nfrom :%d\n\n", name, get_object_mark(&commit->object)); show_progress(); break; } } } int cmd_fast_export(int argc, const char **argv, const char *prefix) { struct rev_info revs; struct object_array commits = { 0, 0, NULL }; struct path_list extra_refs = { NULL, 0, 0, 0 }; struct commit *commit; struct option options[] = { OPT_INTEGER(0, "progress", &progress, "show progress after objects"), OPT_CALLBACK(0, "signed-tags", &signed_tag_mode, "mode", "select handling of signed tags", parse_opt_signed_tag_mode), OPT_END() }; /* we handle encodings */ git_config(git_default_config); init_revisions(&revs, prefix); argc = setup_revisions(argc, argv, &revs, NULL); argc = parse_options(argc, argv, options, fast_export_usage, 0); if (argc > 1) usage_with_options (fast_export_usage, options); get_tags_and_duplicates(&revs.pending, &extra_refs); prepare_revision_walk(&revs); revs.diffopt.format_callback = show_filemodify; DIFF_OPT_SET(&revs.diffopt, RECURSIVE); while ((commit = get_revision(&revs))) { if (has_unshown_parent(commit)) { struct commit_list *parent = commit->parents; add_object_array(&commit->object, NULL, &commits); for (; parent; parent = parent->next) if (!parent->item->util) parent->item->util = commit->util; } else { handle_commit(commit, &revs); handle_tail(&commits, &revs); } } handle_tags_and_duplicates(&extra_refs); return 0; }