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-rw-r--r--builtin/fast-export.c1301
1 files changed, 1301 insertions, 0 deletions
diff --git a/builtin/fast-export.c b/builtin/fast-export.c
new file mode 100644
index 0000000..70aff51
--- /dev/null
+++ b/builtin/fast-export.c
@@ -0,0 +1,1301 @@
+/*
+ * "git fast-export" builtin command
+ *
+ * Copyright (C) 2007 Johannes E. Schindelin
+ */
+#include "builtin.h"
+#include "config.h"
+#include "gettext.h"
+#include "hex.h"
+#include "refs.h"
+#include "refspec.h"
+#include "object-file.h"
+#include "object-store-ll.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_mode { SIGNED_TAG_ABORT, VERBATIM, WARN, WARN_STRIP, STRIP } signed_tag_mode = SIGNED_TAG_ABORT;
+static enum tag_of_filtered_mode { TAG_FILTERING_ABORT, DROP, REWRITE } tag_of_filtered_mode = TAG_FILTERING_ABORT;
+static enum reencode_mode { 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)
+{
+ enum signed_tag_mode *val = opt->value;
+
+ if (unset || !strcmp(arg, "abort"))
+ *val = SIGNED_TAG_ABORT;
+ else if (!strcmp(arg, "verbatim") || !strcmp(arg, "ignore"))
+ *val = VERBATIM;
+ else if (!strcmp(arg, "warn"))
+ *val = WARN;
+ else if (!strcmp(arg, "warn-strip"))
+ *val = WARN_STRIP;
+ else if (!strcmp(arg, "strip"))
+ *val = 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)
+{
+ enum tag_of_filtered_mode *val = opt->value;
+
+ if (unset || !strcmp(arg, "abort"))
+ *val = TAG_FILTERING_ABORT;
+ else if (!strcmp(arg, "drop"))
+ *val = DROP;
+ else if (!strcmp(arg, "rewrite"))
+ *val = 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)
+{
+ enum reencode_mode *val = opt->value;
+
+ if (unset) {
+ *val = REENCODE_ABORT;
+ return 0;
+ }
+
+ switch (git_parse_maybe_bool(arg)) {
+ case 0:
+ *val = REENCODE_NO;
+ break;
+ case 1:
+ *val = REENCODE_YES;
+ break;
+ default:
+ if (!strcasecmp(arg, "abort"))
+ *val = 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;
+ 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);
+}
+
+static struct anonymized_entry *add_anonymized_entry(struct hashmap *map,
+ unsigned hash,
+ const char *orig, size_t len,
+ char *anon)
+{
+ struct anonymized_entry *ret, *old;
+
+ if (!map->cmpfn)
+ hashmap_init(map, anonymized_entry_cmp, NULL, 0);
+
+ FLEX_ALLOC_MEM(ret, orig, orig, len);
+ hashmap_entry_init(&ret->hash, hash);
+ ret->anon = anon;
+ old = hashmap_put_entry(map, ret, hash);
+
+ if (old) {
+ free(old->anon);
+ free(old);
+ }
+
+ return ret;
+}
+
+/*
+ * 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)
+{
+ struct anonymized_entry_key key;
+ struct anonymized_entry *ret;
+
+ 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... */
+ ret = hashmap_get_entry(&anonymized_seeds, &key, hash, &key);
+
+ /* ...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)
+ ret = add_anonymized_entry(map, key.hash.hash,
+ orig, len, generate());
+
+ 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);
+ 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 = repo_read_object_file(the_repository, 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)
+{
+ 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)
+{
+ 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);
+}
+
+static void show_filemodify(struct diff_queue_struct *q,
+ struct diff_options *options UNUSED, 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)
+{
+ 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(void)
+{
+ static int counter;
+ return xstrfmt("subject %d\n\nbody\n", counter++);
+}
+
+static char *anonymize_ident(void)
+{
+ 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);
+ 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 = repo_get_commit_buffer(the_repository, 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();
+ } 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);
+ repo_unuse_commit_buffer(the_repository, 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)
+{
+ 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 = repo_read_object_file(the_repository, &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);
+ 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 (repo_dwim_ref(the_repository, 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 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"));
+
+ add_anonymized_entry(map, memhash(arg, keylen), arg, keylen,
+ xstrdup(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;
+}