summaryrefslogtreecommitdiff
path: root/builtin-fast-export.c
diff options
context:
space:
mode:
Diffstat (limited to 'builtin-fast-export.c')
-rwxr-xr-xbuiltin-fast-export.c406
1 files changed, 406 insertions, 0 deletions
diff --git a/builtin-fast-export.c b/builtin-fast-export.c
new file mode 100755
index 0000000..72be45d
--- /dev/null
+++ b/builtin-fast-export.c
@@ -0,0 +1,406 @@
+/*
+ * "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 { IGNORE, 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, "ignore"))
+ signed_tag_mode = IGNORE;
+ 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 (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=<mode> to handle it.",
+ sha1_to_hex(tag->object.sha1));
+ case WARN:
+ warning ("Exporting signed tag %s",
+ sha1_to_hex(tag->object.sha1));
+ /* fallthru */
+ case IGNORE:
+ 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 <n> 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;
+}