diff options
Diffstat (limited to 'builtin/fast-export.c')
| -rw-r--r-- | builtin/fast-export.c | 1282 |
1 files changed, 1282 insertions, 0 deletions
diff --git a/builtin/fast-export.c b/builtin/fast-export.c new file mode 100644 index 0000000..3b3314e --- /dev/null +++ b/builtin/fast-export.c @@ -0,0 +1,1282 @@ +/* + * "git fast-export" builtin command + * + * Copyright (C) 2007 Johannes E. Schindelin + */ +#include "builtin.h" +#include "cache.h" +#include "config.h" +#include "refs.h" +#include "refspec.h" +#include "object-store.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 "string-list.h" +#include "utf8.h" +#include "parse-options.h" +#include "quote.h" +#include "remote.h" +#include "blob.h" +#include "commit-slab.h" + +static const char *fast_export_usage[] = { + N_("git fast-export [<rev-list-opts>]"), + NULL +}; + +static int progress; +static enum { SIGNED_TAG_ABORT, VERBATIM, WARN, WARN_STRIP, STRIP } signed_tag_mode = SIGNED_TAG_ABORT; +static enum { TAG_FILTERING_ABORT, DROP, REWRITE } tag_of_filtered_mode = TAG_FILTERING_ABORT; +static enum { REENCODE_ABORT, REENCODE_YES, REENCODE_NO } reencode_mode = REENCODE_ABORT; +static int fake_missing_tagger; +static int use_done_feature; +static int no_data; +static int full_tree; +static int reference_excluded_commits; +static int show_original_ids; +static int mark_tags; +static struct string_list extra_refs = STRING_LIST_INIT_NODUP; +static struct string_list tag_refs = STRING_LIST_INIT_NODUP; +static struct refspec refspecs = REFSPEC_INIT_FETCH; +static int anonymize; +static struct hashmap anonymized_seeds; +static struct revision_sources revision_sources; + +static int parse_opt_signed_tag_mode(const struct option *opt, + const char *arg, int unset) +{ + if (unset || !strcmp(arg, "abort")) + signed_tag_mode = SIGNED_TAG_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, "warn-strip")) + signed_tag_mode = WARN_STRIP; + else if (!strcmp(arg, "strip")) + signed_tag_mode = STRIP; + else + return error("Unknown signed-tags mode: %s", arg); + return 0; +} + +static int parse_opt_tag_of_filtered_mode(const struct option *opt, + const char *arg, int unset) +{ + if (unset || !strcmp(arg, "abort")) + tag_of_filtered_mode = TAG_FILTERING_ABORT; + else if (!strcmp(arg, "drop")) + tag_of_filtered_mode = DROP; + else if (!strcmp(arg, "rewrite")) + tag_of_filtered_mode = REWRITE; + else + return error("Unknown tag-of-filtered mode: %s", arg); + return 0; +} + +static int parse_opt_reencode_mode(const struct option *opt, + const char *arg, int unset) +{ + if (unset) { + reencode_mode = REENCODE_ABORT; + return 0; + } + + switch (git_parse_maybe_bool(arg)) { + case 0: + reencode_mode = REENCODE_NO; + break; + case 1: + reencode_mode = REENCODE_YES; + break; + default: + if (!strcasecmp(arg, "abort")) + reencode_mode = REENCODE_ABORT; + else + return error("Unknown reencoding mode: %s", arg); + } + + return 0; +} + +static struct decoration idnums; +static uint32_t last_idnum; +struct anonymized_entry { + struct hashmap_entry hash; + const char *anon; + const char orig[FLEX_ARRAY]; +}; + +struct anonymized_entry_key { + struct hashmap_entry hash; + const char *orig; + size_t orig_len; +}; + +static int anonymized_entry_cmp(const void *cmp_data UNUSED, + const struct hashmap_entry *eptr, + const struct hashmap_entry *entry_or_key, + const void *keydata) +{ + const struct anonymized_entry *a, *b; + + a = container_of(eptr, const struct anonymized_entry, hash); + if (keydata) { + const struct anonymized_entry_key *key = keydata; + int equal = !strncmp(a->orig, key->orig, key->orig_len) && + !a->orig[key->orig_len]; + return !equal; + } + + b = container_of(entry_or_key, const struct anonymized_entry, hash); + return strcmp(a->orig, b->orig); +} + +/* + * Basically keep a cache of X->Y so that we can repeatedly replace + * the same anonymized string with another. The actual generation + * is farmed out to the generate function. + */ +static const char *anonymize_str(struct hashmap *map, + char *(*generate)(void *), + const char *orig, size_t len, + void *data) +{ + struct anonymized_entry_key key; + struct anonymized_entry *ret; + + if (!map->cmpfn) + hashmap_init(map, anonymized_entry_cmp, NULL, 0); + + hashmap_entry_init(&key.hash, memhash(orig, len)); + key.orig = orig; + key.orig_len = len; + + /* First check if it's a token the user configured manually... */ + if (anonymized_seeds.cmpfn) + ret = hashmap_get_entry(&anonymized_seeds, &key, hash, &key); + else + ret = NULL; + + /* ...otherwise check if we've already seen it in this context... */ + if (!ret) + ret = hashmap_get_entry(map, &key, hash, &key); + + /* ...and finally generate a new mapping if necessary */ + if (!ret) { + FLEX_ALLOC_MEM(ret, orig, orig, len); + hashmap_entry_init(&ret->hash, key.hash.hash); + ret->anon = generate(data); + hashmap_put(map, &ret->hash); + } + + return ret->anon; +} + +/* + * We anonymize each component of a path individually, + * so that paths a/b and a/c will share a common root. + * The paths are cached via anonymize_mem so that repeated + * lookups for "a" will yield the same value. + */ +static void anonymize_path(struct strbuf *out, const char *path, + struct hashmap *map, + char *(*generate)(void *)) +{ + while (*path) { + const char *end_of_component = strchrnul(path, '/'); + size_t len = end_of_component - path; + const char *c = anonymize_str(map, generate, path, len, NULL); + strbuf_addstr(out, c); + path = end_of_component; + if (*path) + strbuf_addch(out, *path++); + } +} + +static inline void *mark_to_ptr(uint32_t mark) +{ + return (void *)(uintptr_t)mark; +} + +static inline uint32_t ptr_to_mark(void * mark) +{ + return (uint32_t)(uintptr_t)mark; +} + +static inline void mark_object(struct object *object, uint32_t mark) +{ + add_decoration(&idnums, object, mark_to_ptr(mark)); +} + +static inline void mark_next_object(struct object *object) +{ + mark_object(object, ++last_idnum); +} + +static int get_object_mark(struct object *object) +{ + void *decoration = lookup_decoration(&idnums, object); + if (!decoration) + return 0; + return ptr_to_mark(decoration); +} + +static struct commit *rewrite_commit(struct commit *p) +{ + for (;;) { + if (p->parents && p->parents->next) + break; + if (p->object.flags & UNINTERESTING) + break; + if (!(p->object.flags & TREESAME)) + break; + if (!p->parents) + return NULL; + p = p->parents->item; + } + return p; +} + +static void show_progress(void) +{ + static int counter = 0; + if (!progress) + return; + if ((++counter % progress) == 0) + printf("progress %d objects\n", counter); +} + +/* + * Ideally we would want some transformation of the blob data here + * that is unreversible, but would still be the same size and have + * the same data relationship to other blobs (so that we get the same + * delta and packing behavior as the original). But the first and last + * requirements there are probably mutually exclusive, so let's take + * the easy way out for now, and just generate arbitrary content. + * + * There's no need to cache this result with anonymize_mem, since + * we already handle blob content caching with marks. + */ +static char *anonymize_blob(unsigned long *size) +{ + static int counter; + struct strbuf out = STRBUF_INIT; + strbuf_addf(&out, "anonymous blob %d", counter++); + *size = out.len; + return strbuf_detach(&out, NULL); +} + +static void export_blob(const struct object_id *oid) +{ + unsigned long size; + enum object_type type; + char *buf; + struct object *object; + int eaten; + + if (no_data) + return; + + if (is_null_oid(oid)) + return; + + object = lookup_object(the_repository, oid); + if (object && object->flags & SHOWN) + return; + + if (anonymize) { + buf = anonymize_blob(&size); + object = (struct object *)lookup_blob(the_repository, oid); + eaten = 0; + } else { + buf = read_object_file(oid, &type, &size); + if (!buf) + die("could not read blob %s", oid_to_hex(oid)); + if (check_object_signature(the_repository, oid, buf, size, + type) < 0) + die("oid mismatch in blob %s", oid_to_hex(oid)); + object = parse_object_buffer(the_repository, oid, type, + size, buf, &eaten); + } + + if (!object) + die("Could not read blob %s", oid_to_hex(oid)); + + mark_next_object(object); + + printf("blob\nmark :%"PRIu32"\n", last_idnum); + if (show_original_ids) + printf("original-oid %s\n", oid_to_hex(oid)); + printf("data %"PRIuMAX"\n", (uintmax_t)size); + if (size && fwrite(buf, size, 1, stdout) != 1) + die_errno("could not write blob '%s'", oid_to_hex(oid)); + printf("\n"); + + show_progress(); + + object->flags |= SHOWN; + if (!eaten) + free(buf); +} + +static int depth_first(const void *a_, const void *b_) +{ + const struct diff_filepair *a = *((const struct diff_filepair **)a_); + const struct diff_filepair *b = *((const struct diff_filepair **)b_); + const char *name_a, *name_b; + int len_a, len_b, len; + int cmp; + + name_a = a->one ? a->one->path : a->two->path; + name_b = b->one ? b->one->path : b->two->path; + + len_a = strlen(name_a); + len_b = strlen(name_b); + len = (len_a < len_b) ? len_a : len_b; + + /* strcmp will sort 'd' before 'd/e', we want 'd/e' before 'd' */ + cmp = memcmp(name_a, name_b, len); + if (cmp) + return cmp; + cmp = len_b - len_a; + if (cmp) + return cmp; + /* + * Move 'R'ename entries last so that all references of the file + * appear in the output before it is renamed (e.g., when a file + * was copied and renamed in the same commit). + */ + return (a->status == 'R') - (b->status == 'R'); +} + +static void print_path_1(const char *path) +{ + int need_quote = quote_c_style(path, NULL, NULL, 0); + if (need_quote) + quote_c_style(path, NULL, stdout, 0); + else if (strchr(path, ' ')) + printf("\"%s\"", path); + else + printf("%s", path); +} + +static char *anonymize_path_component(void *data) +{ + static int counter; + struct strbuf out = STRBUF_INIT; + strbuf_addf(&out, "path%d", counter++); + return strbuf_detach(&out, NULL); +} + +static void print_path(const char *path) +{ + if (!anonymize) + print_path_1(path); + else { + static struct hashmap paths; + static struct strbuf anon = STRBUF_INIT; + + anonymize_path(&anon, path, &paths, anonymize_path_component); + print_path_1(anon.buf); + strbuf_reset(&anon); + } +} + +static char *generate_fake_oid(void *data) +{ + static uint32_t counter = 1; /* avoid null oid */ + const unsigned hashsz = the_hash_algo->rawsz; + struct object_id oid; + char *hex = xmallocz(GIT_MAX_HEXSZ); + + oidclr(&oid); + put_be32(oid.hash + hashsz - 4, counter++); + return oid_to_hex_r(hex, &oid); +} + +static const char *anonymize_oid(const char *oid_hex) +{ + static struct hashmap objs; + size_t len = strlen(oid_hex); + return anonymize_str(&objs, generate_fake_oid, oid_hex, len, NULL); +} + +static void show_filemodify(struct diff_queue_struct *q, + struct diff_options *options, void *data) +{ + int i; + struct string_list *changed = data; + + /* + * Handle files below a directory first, in case they are all deleted + * and the directory changes to a file or symlink. + */ + QSORT(q->queue, q->nr, depth_first); + + for (i = 0; i < q->nr; i++) { + struct diff_filespec *ospec = q->queue[i]->one; + struct diff_filespec *spec = q->queue[i]->two; + + switch (q->queue[i]->status) { + case DIFF_STATUS_DELETED: + printf("D "); + print_path(spec->path); + string_list_insert(changed, spec->path); + putchar('\n'); + break; + + case DIFF_STATUS_COPIED: + case DIFF_STATUS_RENAMED: + /* + * If a change in the file corresponding to ospec->path + * has been observed, we cannot trust its contents + * because the diff is calculated based on the prior + * contents, not the current contents. So, declare a + * copy or rename only if there was no change observed. + */ + if (!string_list_has_string(changed, ospec->path)) { + printf("%c ", q->queue[i]->status); + print_path(ospec->path); + putchar(' '); + print_path(spec->path); + string_list_insert(changed, spec->path); + putchar('\n'); + + if (oideq(&ospec->oid, &spec->oid) && + ospec->mode == spec->mode) + break; + } + /* fallthrough */ + + case DIFF_STATUS_TYPE_CHANGED: + case DIFF_STATUS_MODIFIED: + case DIFF_STATUS_ADDED: + /* + * Links refer to objects in another repositories; + * output the SHA-1 verbatim. + */ + if (no_data || S_ISGITLINK(spec->mode)) + printf("M %06o %s ", spec->mode, + anonymize ? + anonymize_oid(oid_to_hex(&spec->oid)) : + oid_to_hex(&spec->oid)); + else { + struct object *object = lookup_object(the_repository, + &spec->oid); + printf("M %06o :%d ", spec->mode, + get_object_mark(object)); + } + print_path(spec->path); + string_list_insert(changed, spec->path); + putchar('\n'); + break; + + default: + die("Unexpected comparison status '%c' for %s, %s", + q->queue[i]->status, + ospec->path ? ospec->path : "none", + spec->path ? spec->path : "none"); + } + } +} + +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 NULL; + bol += strlen(needle); + eol = strchrnul(bol, '\n'); + *eol = '\0'; + return bol; +} + +static char *anonymize_ref_component(void *data) +{ + static int counter; + struct strbuf out = STRBUF_INIT; + strbuf_addf(&out, "ref%d", counter++); + return strbuf_detach(&out, NULL); +} + +static const char *anonymize_refname(const char *refname) +{ + /* + * If any of these prefixes is found, we will leave it intact + * so that tags remain tags and so forth. + */ + static const char *prefixes[] = { + "refs/heads/", + "refs/tags/", + "refs/remotes/", + "refs/" + }; + static struct hashmap refs; + static struct strbuf anon = STRBUF_INIT; + int i; + + strbuf_reset(&anon); + for (i = 0; i < ARRAY_SIZE(prefixes); i++) { + if (skip_prefix(refname, prefixes[i], &refname)) { + strbuf_addstr(&anon, prefixes[i]); + break; + } + } + + anonymize_path(&anon, refname, &refs, anonymize_ref_component); + return anon.buf; +} + +/* + * We do not even bother to cache commit messages, as they are unlikely + * to be repeated verbatim, and it is not that interesting when they are. + */ +static char *anonymize_commit_message(const char *old) +{ + static int counter; + return xstrfmt("subject %d\n\nbody\n", counter++); +} + +static char *anonymize_ident(void *data) +{ + static int counter; + struct strbuf out = STRBUF_INIT; + strbuf_addf(&out, "User %d <user%d@example.com>", counter, counter); + counter++; + return strbuf_detach(&out, NULL); +} + +/* + * Our strategy here is to anonymize the names and email addresses, + * but keep timestamps intact, as they influence things like traversal + * order (and by themselves should not be too revealing). + */ +static void anonymize_ident_line(const char **beg, const char **end) +{ + static struct hashmap idents; + static struct strbuf buffers[] = { STRBUF_INIT, STRBUF_INIT }; + static unsigned which_buffer; + + struct strbuf *out; + struct ident_split split; + const char *end_of_header; + + out = &buffers[which_buffer++]; + which_buffer %= ARRAY_SIZE(buffers); + strbuf_reset(out); + + /* skip "committer", "author", "tagger", etc */ + end_of_header = strchr(*beg, ' '); + if (!end_of_header) + BUG("malformed line fed to anonymize_ident_line: %.*s", + (int)(*end - *beg), *beg); + end_of_header++; + strbuf_add(out, *beg, end_of_header - *beg); + + if (!split_ident_line(&split, end_of_header, *end - end_of_header) && + split.date_begin) { + const char *ident; + size_t len; + + len = split.mail_end - split.name_begin; + ident = anonymize_str(&idents, anonymize_ident, + split.name_begin, len, NULL); + strbuf_addstr(out, ident); + strbuf_addch(out, ' '); + strbuf_add(out, split.date_begin, split.tz_end - split.date_begin); + } else { + strbuf_addstr(out, "Malformed Ident <malformed@example.com> 0 -0000"); + } + + *beg = out->buf; + *end = out->buf + out->len; +} + +static void handle_commit(struct commit *commit, struct rev_info *rev, + struct string_list *paths_of_changed_objects) +{ + int saved_output_format = rev->diffopt.output_format; + const char *commit_buffer; + const char *author, *author_end, *committer, *committer_end; + const char *encoding, *message; + char *reencoded = NULL; + struct commit_list *p; + const char *refname; + int i; + + rev->diffopt.output_format = DIFF_FORMAT_CALLBACK; + + parse_commit_or_die(commit); + commit_buffer = get_commit_buffer(commit, NULL); + author = strstr(commit_buffer, "\nauthor "); + if (!author) + die("could not find author in commit %s", + oid_to_hex(&commit->object.oid)); + author++; + author_end = strchrnul(author, '\n'); + committer = strstr(author_end, "\ncommitter "); + if (!committer) + die("could not find committer in commit %s", + oid_to_hex(&commit->object.oid)); + 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 && + (get_object_mark(&commit->parents->item->object) != 0 || + reference_excluded_commits) && + !full_tree) { + parse_commit_or_die(commit->parents->item); + diff_tree_oid(get_commit_tree_oid(commit->parents->item), + get_commit_tree_oid(commit), "", &rev->diffopt); + } + else + diff_root_tree_oid(get_commit_tree_oid(commit), + "", &rev->diffopt); + + /* Export the referenced blobs, and remember the marks. */ + for (i = 0; i < diff_queued_diff.nr; i++) + if (!S_ISGITLINK(diff_queued_diff.queue[i]->two->mode)) + export_blob(&diff_queued_diff.queue[i]->two->oid); + + refname = *revision_sources_at(&revision_sources, commit); + /* + * FIXME: string_list_remove() below for each ref is overall + * O(N^2). Compared to a history walk and diffing trees, this is + * just lost in the noise in practice. However, theoretically a + * repo may have enough refs for this to become slow. + */ + string_list_remove(&extra_refs, refname, 0); + if (anonymize) { + refname = anonymize_refname(refname); + anonymize_ident_line(&committer, &committer_end); + anonymize_ident_line(&author, &author_end); + } + + mark_next_object(&commit->object); + if (anonymize) { + reencoded = anonymize_commit_message(message); + } else if (encoding) { + switch(reencode_mode) { + case REENCODE_YES: + reencoded = reencode_string(message, "UTF-8", encoding); + break; + case REENCODE_NO: + break; + case REENCODE_ABORT: + die("Encountered commit-specific encoding %s in commit " + "%s; use --reencode=[yes|no] to handle it", + encoding, oid_to_hex(&commit->object.oid)); + } + } + if (!commit->parents) + printf("reset %s\n", refname); + printf("commit %s\nmark :%"PRIu32"\n", refname, last_idnum); + if (show_original_ids) + printf("original-oid %s\n", oid_to_hex(&commit->object.oid)); + printf("%.*s\n%.*s\n", + (int)(author_end - author), author, + (int)(committer_end - committer), committer); + if (!reencoded && encoding) + printf("encoding %s\n", encoding); + printf("data %u\n%s", + (unsigned)(reencoded + ? strlen(reencoded) : message + ? strlen(message) : 0), + reencoded ? reencoded : message ? message : ""); + free(reencoded); + unuse_commit_buffer(commit, commit_buffer); + + for (i = 0, p = commit->parents; p; p = p->next) { + struct object *obj = &p->item->object; + int mark = get_object_mark(obj); + + if (!mark && !reference_excluded_commits) + continue; + if (i == 0) + printf("from "); + else + printf("merge "); + if (mark) + printf(":%d\n", mark); + else + printf("%s\n", + anonymize ? + anonymize_oid(oid_to_hex(&obj->oid)) : + oid_to_hex(&obj->oid)); + i++; + } + + if (full_tree) + printf("deleteall\n"); + log_tree_diff_flush(rev); + string_list_clear(paths_of_changed_objects, 0); + rev->diffopt.output_format = saved_output_format; + + printf("\n"); + + show_progress(); +} + +static char *anonymize_tag(void *data) +{ + static int counter; + struct strbuf out = STRBUF_INIT; + strbuf_addf(&out, "tag message %d", counter++); + return strbuf_detach(&out, NULL); +} + + +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; + struct object *tagged; + int tagged_mark; + struct commit *p; + + /* Trees have no identifier in fast-export output, thus we have no way + * to output tags of trees, tags of tags of trees, etc. Simply omit + * such tags. + */ + tagged = tag->tagged; + while (tagged->type == OBJ_TAG) { + tagged = ((struct tag *)tagged)->tagged; + } + if (tagged->type == OBJ_TREE) { + warning("Omitting tag %s,\nsince tags of trees (or tags of tags of trees, etc.) are not supported.", + oid_to_hex(&tag->object.oid)); + return; + } + + buf = read_object_file(&tag->object.oid, &type, &size); + if (!buf) + die("could not read tag %s", oid_to_hex(&tag->object.oid)); + 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) { + if (fake_missing_tagger) + tagger = "tagger Unspecified Tagger " + "<unspecified-tagger> 0 +0000"; + else + tagger = ""; + tagger_end = tagger + strlen(tagger); + } else { + tagger++; + tagger_end = strchrnul(tagger, '\n'); + if (anonymize) + anonymize_ident_line(&tagger, &tagger_end); + } + + if (anonymize) { + name = anonymize_refname(name); + if (message) { + static struct hashmap tags; + message = anonymize_str(&tags, anonymize_tag, + message, message_size, NULL); + message_size = strlen(message); + } + } + + /* handle signed tags */ + if (message) { + const char *signature = strstr(message, + "\n-----BEGIN PGP SIGNATURE-----\n"); + if (signature) + switch(signed_tag_mode) { + case SIGNED_TAG_ABORT: + die("encountered signed tag %s; use " + "--signed-tags=<mode> to handle it", + oid_to_hex(&tag->object.oid)); + case WARN: + warning("exporting signed tag %s", + oid_to_hex(&tag->object.oid)); + /* fallthru */ + case VERBATIM: + break; + case WARN_STRIP: + warning("stripping signature from tag %s", + oid_to_hex(&tag->object.oid)); + /* fallthru */ + case STRIP: + message_size = signature + 1 - message; + break; + } + } + + /* handle tag->tagged having been filtered out due to paths specified */ + tagged = tag->tagged; + tagged_mark = get_object_mark(tagged); + if (!tagged_mark) { + switch(tag_of_filtered_mode) { + case TAG_FILTERING_ABORT: + die("tag %s tags unexported object; use " + "--tag-of-filtered-object=<mode> to handle it", + oid_to_hex(&tag->object.oid)); + case DROP: + /* Ignore this tag altogether */ + free(buf); + return; + case REWRITE: + if (tagged->type == OBJ_TAG && !mark_tags) { + die(_("Error: Cannot export nested tags unless --mark-tags is specified.")); + } else if (tagged->type == OBJ_COMMIT) { + p = rewrite_commit((struct commit *)tagged); + if (!p) { + printf("reset %s\nfrom %s\n\n", + name, oid_to_hex(null_oid())); + free(buf); + return; + } + tagged_mark = get_object_mark(&p->object); + } else { + /* tagged->type is either OBJ_BLOB or OBJ_TAG */ + tagged_mark = get_object_mark(tagged); + } + } + } + + if (tagged->type == OBJ_TAG) { + printf("reset %s\nfrom %s\n\n", + name, oid_to_hex(null_oid())); + } + skip_prefix(name, "refs/tags/", &name); + printf("tag %s\n", name); + if (mark_tags) { + mark_next_object(&tag->object); + printf("mark :%"PRIu32"\n", last_idnum); + } + if (tagged_mark) + printf("from :%d\n", tagged_mark); + else + printf("from %s\n", oid_to_hex(&tagged->oid)); + + if (show_original_ids) + printf("original-oid %s\n", oid_to_hex(&tag->object.oid)); + printf("%.*s%sdata %d\n%.*s\n", + (int)(tagger_end - tagger), tagger, + tagger == tagger_end ? "" : "\n", + (int)message_size, (int)message_size, message ? message : ""); + free(buf); +} + +static struct commit *get_commit(struct rev_cmdline_entry *e, char *full_name) +{ + switch (e->item->type) { + case OBJ_COMMIT: + return (struct commit *)e->item; + case OBJ_TAG: { + struct tag *tag = (struct tag *)e->item; + + /* handle nested tags */ + while (tag && tag->object.type == OBJ_TAG) { + parse_object(the_repository, &tag->object.oid); + string_list_append(&tag_refs, full_name)->util = tag; + tag = (struct tag *)tag->tagged; + } + if (!tag) + die("Tag %s points nowhere?", e->name); + return (struct commit *)tag; + } + default: + return NULL; + } +} + +static void get_tags_and_duplicates(struct rev_cmdline_info *info) +{ + int i; + + for (i = 0; i < info->nr; i++) { + struct rev_cmdline_entry *e = info->rev + i; + struct object_id oid; + struct commit *commit; + char *full_name; + + if (e->flags & UNINTERESTING) + continue; + + if (dwim_ref(e->name, strlen(e->name), &oid, &full_name, 0) != 1) + continue; + + if (refspecs.nr) { + char *private; + private = apply_refspecs(&refspecs, full_name); + if (private) { + free(full_name); + full_name = private; + } + } + + commit = get_commit(e, full_name); + if (!commit) { + warning("%s: Unexpected object of type %s, skipping.", + e->name, + type_name(e->item->type)); + continue; + } + + switch(commit->object.type) { + case OBJ_COMMIT: + break; + case OBJ_BLOB: + export_blob(&commit->object.oid); + continue; + default: /* OBJ_TAG (nested tags) is already handled */ + warning("Tag points to object of unexpected type %s, skipping.", + type_name(commit->object.type)); + continue; + } + + /* + * Make sure this ref gets properly updated eventually, whether + * through a commit or manually at the end. + */ + if (e->item->type != OBJ_TAG) + string_list_append(&extra_refs, full_name)->util = commit; + + if (!*revision_sources_at(&revision_sources, commit)) + *revision_sources_at(&revision_sources, commit) = full_name; + } + + string_list_sort(&extra_refs); + string_list_remove_duplicates(&extra_refs, 0); +} + +static void handle_tags_and_duplicates(struct string_list *extras) +{ + struct commit *commit; + int i; + + for (i = extras->nr - 1; i >= 0; i--) { + const char *name = extras->items[i].string; + struct object *object = extras->items[i].util; + int mark; + + switch (object->type) { + case OBJ_TAG: + handle_tag(name, (struct tag *)object); + break; + case OBJ_COMMIT: + if (anonymize) + name = anonymize_refname(name); + /* create refs pointing to already seen commits */ + commit = rewrite_commit((struct commit *)object); + if (!commit) { + /* + * Neither this object nor any of its + * ancestors touch any relevant paths, so + * it has been filtered to nothing. Delete + * it. + */ + printf("reset %s\nfrom %s\n\n", + name, oid_to_hex(null_oid())); + continue; + } + + mark = get_object_mark(&commit->object); + if (!mark) { + /* + * Getting here means we have a commit which + * was excluded by a negative refspec (e.g. + * fast-export ^HEAD HEAD). If we are + * referencing excluded commits, set the ref + * to the exact commit. Otherwise, the user + * wants the branch exported but every commit + * in its history to be deleted, which basically + * just means deletion of the ref. + */ + if (!reference_excluded_commits) { + /* delete the ref */ + printf("reset %s\nfrom %s\n\n", + name, oid_to_hex(null_oid())); + continue; + } + /* set ref to commit using oid, not mark */ + printf("reset %s\nfrom %s\n\n", name, + oid_to_hex(&commit->object.oid)); + continue; + } + + printf("reset %s\nfrom :%d\n\n", name, mark + ); + show_progress(); + break; + } + } +} + +static void export_marks(char *file) +{ + unsigned int i; + uint32_t mark; + struct decoration_entry *deco = idnums.entries; + FILE *f; + int e = 0; + + f = fopen_for_writing(file); + if (!f) + die_errno("Unable to open marks file %s for writing.", file); + + for (i = 0; i < idnums.size; i++) { + if (deco->base && deco->base->type == 1) { + mark = ptr_to_mark(deco->decoration); + if (fprintf(f, ":%"PRIu32" %s\n", mark, + oid_to_hex(&deco->base->oid)) < 0) { + e = 1; + break; + } + } + deco++; + } + + e |= ferror(f); + e |= fclose(f); + if (e) + error("Unable to write marks file %s.", file); +} + +static void import_marks(char *input_file, int check_exists) +{ + char line[512]; + FILE *f; + struct stat sb; + + if (check_exists && stat(input_file, &sb)) + return; + + f = xfopen(input_file, "r"); + while (fgets(line, sizeof(line), f)) { + uint32_t mark; + char *line_end, *mark_end; + struct object_id oid; + struct object *object; + struct commit *commit; + enum object_type type; + + line_end = strchr(line, '\n'); + if (line[0] != ':' || !line_end) + die("corrupt mark line: %s", line); + *line_end = '\0'; + + mark = strtoumax(line + 1, &mark_end, 10); + if (!mark || mark_end == line + 1 + || *mark_end != ' ' || get_oid_hex(mark_end + 1, &oid)) + die("corrupt mark line: %s", line); + + if (last_idnum < mark) + last_idnum = mark; + + type = oid_object_info(the_repository, &oid, NULL); + if (type < 0) + die("object not found: %s", oid_to_hex(&oid)); + + if (type != OBJ_COMMIT) + /* only commits */ + continue; + + commit = lookup_commit(the_repository, &oid); + if (!commit) + die("not a commit? can't happen: %s", oid_to_hex(&oid)); + + object = &commit->object; + + if (object->flags & SHOWN) + error("Object %s already has a mark", oid_to_hex(&oid)); + + mark_object(object, mark); + + object->flags |= SHOWN; + } + fclose(f); +} + +static void handle_deletes(void) +{ + int i; + for (i = 0; i < refspecs.nr; i++) { + struct refspec_item *refspec = &refspecs.items[i]; + if (*refspec->src) + continue; + + printf("reset %s\nfrom %s\n\n", + refspec->dst, oid_to_hex(null_oid())); + } +} + +static char *anonymize_seed(void *data) +{ + return xstrdup(data); +} + +static int parse_opt_anonymize_map(const struct option *opt, + const char *arg, int unset) +{ + struct hashmap *map = opt->value; + const char *delim, *value; + size_t keylen; + + BUG_ON_OPT_NEG(unset); + + delim = strchr(arg, ':'); + if (delim) { + keylen = delim - arg; + value = delim + 1; + } else { + keylen = strlen(arg); + value = arg; + } + + if (!keylen || !*value) + return error(_("--anonymize-map token cannot be empty")); + + anonymize_str(map, anonymize_seed, arg, keylen, (void *)value); + + return 0; +} + +int cmd_fast_export(int argc, const char **argv, const char *prefix) +{ + struct rev_info revs; + struct commit *commit; + char *export_filename = NULL, + *import_filename = NULL, + *import_filename_if_exists = NULL; + uint32_t lastimportid; + struct string_list refspecs_list = STRING_LIST_INIT_NODUP; + struct string_list paths_of_changed_objects = STRING_LIST_INIT_DUP; + struct option options[] = { + OPT_INTEGER(0, "progress", &progress, + N_("show progress after <n> objects")), + OPT_CALLBACK(0, "signed-tags", &signed_tag_mode, N_("mode"), + N_("select handling of signed tags"), + parse_opt_signed_tag_mode), + OPT_CALLBACK(0, "tag-of-filtered-object", &tag_of_filtered_mode, N_("mode"), + N_("select handling of tags that tag filtered objects"), + parse_opt_tag_of_filtered_mode), + OPT_CALLBACK(0, "reencode", &reencode_mode, N_("mode"), + N_("select handling of commit messages in an alternate encoding"), + parse_opt_reencode_mode), + OPT_STRING(0, "export-marks", &export_filename, N_("file"), + N_("dump marks to this file")), + OPT_STRING(0, "import-marks", &import_filename, N_("file"), + N_("import marks from this file")), + OPT_STRING(0, "import-marks-if-exists", + &import_filename_if_exists, + N_("file"), + N_("import marks from this file if it exists")), + OPT_BOOL(0, "fake-missing-tagger", &fake_missing_tagger, + N_("fake a tagger when tags lack one")), + OPT_BOOL(0, "full-tree", &full_tree, + N_("output full tree for each commit")), + OPT_BOOL(0, "use-done-feature", &use_done_feature, + N_("use the done feature to terminate the stream")), + OPT_BOOL(0, "no-data", &no_data, N_("skip output of blob data")), + OPT_STRING_LIST(0, "refspec", &refspecs_list, N_("refspec"), + N_("apply refspec to exported refs")), + OPT_BOOL(0, "anonymize", &anonymize, N_("anonymize output")), + OPT_CALLBACK_F(0, "anonymize-map", &anonymized_seeds, N_("from:to"), + N_("convert <from> to <to> in anonymized output"), + PARSE_OPT_NONEG, parse_opt_anonymize_map), + OPT_BOOL(0, "reference-excluded-parents", + &reference_excluded_commits, N_("reference parents which are not in fast-export stream by object id")), + OPT_BOOL(0, "show-original-ids", &show_original_ids, + N_("show original object ids of blobs/commits")), + OPT_BOOL(0, "mark-tags", &mark_tags, + N_("label tags with mark ids")), + + OPT_END() + }; + + if (argc == 1) + usage_with_options (fast_export_usage, options); + + /* we handle encodings */ + git_config(git_default_config, NULL); + + repo_init_revisions(the_repository, &revs, prefix); + init_revision_sources(&revision_sources); + revs.topo_order = 1; + revs.sources = &revision_sources; + revs.rewrite_parents = 1; + argc = parse_options(argc, argv, prefix, options, fast_export_usage, + PARSE_OPT_KEEP_ARGV0 | PARSE_OPT_KEEP_UNKNOWN_OPT); + argc = setup_revisions(argc, argv, &revs, NULL); + if (argc > 1) + usage_with_options (fast_export_usage, options); + + if (anonymized_seeds.cmpfn && !anonymize) + die(_("the option '%s' requires '%s'"), "--anonymize-map", "--anonymize"); + + if (refspecs_list.nr) { + int i; + + for (i = 0; i < refspecs_list.nr; i++) + refspec_append(&refspecs, refspecs_list.items[i].string); + + string_list_clear(&refspecs_list, 1); + } + + if (use_done_feature) + printf("feature done\n"); + + if (import_filename && import_filename_if_exists) + die(_("options '%s' and '%s' cannot be used together"), "--import-marks", "--import-marks-if-exists"); + if (import_filename) + import_marks(import_filename, 0); + else if (import_filename_if_exists) + import_marks(import_filename_if_exists, 1); + lastimportid = last_idnum; + + if (import_filename && revs.prune_data.nr) + full_tree = 1; + + get_tags_and_duplicates(&revs.cmdline); + + if (prepare_revision_walk(&revs)) + die("revision walk setup failed"); + + revs.reverse = 1; + revs.diffopt.format_callback = show_filemodify; + revs.diffopt.format_callback_data = &paths_of_changed_objects; + revs.diffopt.flags.recursive = 1; + revs.diffopt.no_free = 1; + while ((commit = get_revision(&revs))) + handle_commit(commit, &revs, &paths_of_changed_objects); + + handle_tags_and_duplicates(&extra_refs); + handle_tags_and_duplicates(&tag_refs); + handle_deletes(); + + if (export_filename && lastimportid != last_idnum) + export_marks(export_filename); + + if (use_done_feature) + printf("done\n"); + + refspec_clear(&refspecs); + release_revisions(&revs); + + return 0; +} |