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/*
* "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 "string-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 inline uint32_t *mark_to_ptr(uint32_t mark)
{
return ((uint32_t *)NULL) + mark;
}
static inline uint32_t ptr_to_mark(void * mark)
{
return (uint32_t *)mark - (uint32_t *)NULL;
}
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 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_next_object(object);
printf("blob\nmark :%"PRIu32"\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 *ospec = q->queue[i]->one;
struct diff_filespec *spec = q->queue[i]->two;
switch (q->queue[i]->status) {
case DIFF_STATUS_DELETED:
printf("D %s\n", spec->path);
break;
case DIFF_STATUS_COPIED:
case DIFF_STATUS_RENAMED:
printf("%c \"%s\" \"%s\"\n", q->queue[i]->status,
ospec->path, spec->path);
if (!hashcmp(ospec->sha1, spec->sha1) &&
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 (S_ISGITLINK(spec->mode))
printf("M %06o %s %s\n", spec->mode,
sha1_to_hex(spec->sha1), spec->path);
else {
struct object *object = lookup_object(spec->sha1);
printf("M %06o :%d %s\n", spec->mode,
get_object_mark(object), spec->path);
}
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 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);
/* 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))
handle_object(diff_queued_diff.queue[i]->two->sha1);
mark_next_object(&commit->object);
if (!is_encoding_utf8(encoding))
reencoded = reencode_string(message, "UTF-8", encoding);
if (!commit->parents)
printf("reset %s\n", (const char*)commit->util);
printf("commit %s\nmark :%"PRIu32"\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 : "");
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
printf("merge :%d\n", mark);
i++;
}
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 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 string_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) {
string_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 */
string_list_insert(full_name, extra_refs)->util = commit;
else
commit->util = full_name;
}
}
static void handle_tags_and_duplicates(struct string_list *extra_refs)
{
struct commit *commit;
int i;
for (i = extra_refs->nr - 1; i >= 0; i--) {
const char *name = extra_refs->items[i].string;
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;
}
}
}
static void export_marks(char *file)
{
unsigned int i;
uint32_t mark;
struct object_decoration *deco = idnums.hash;
FILE *f;
f = fopen(file, "w");
if (!f)
error("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);
fprintf(f, ":%"PRIu32" %s\n", mark,
sha1_to_hex(deco->base->sha1));
}
deco++;
}
if (ferror(f) || fclose(f))
error("Unable to write marks file %s.", file);
}
static void import_marks(char *input_file)
{
char line[512];
FILE *f = fopen(input_file, "r");
if (!f)
die("cannot read %s: %s", input_file, strerror(errno));
while (fgets(line, sizeof(line), f)) {
uint32_t mark;
char *line_end, *mark_end;
unsigned char sha1[20];
struct object *object;
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_sha1(mark_end + 1, sha1))
die("corrupt mark line: %s", line);
object = parse_object(sha1);
if (!object)
die ("Could not read blob %s", sha1_to_hex(sha1));
if (object->flags & SHOWN)
error("Object %s already has a mark", sha1);
mark_object(object, mark);
if (last_idnum < mark)
last_idnum = mark;
object->flags |= SHOWN;
}
fclose(f);
}
int cmd_fast_export(int argc, const char **argv, const char *prefix)
{
struct rev_info revs;
struct object_array commits = { 0, 0, NULL };
struct string_list extra_refs = { NULL, 0, 0, 0 };
struct commit *commit;
char *export_filename = NULL, *import_filename = NULL;
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_STRING(0, "export-marks", &export_filename, "FILE",
"Dump marks to this file"),
OPT_STRING(0, "import-marks", &import_filename, "FILE",
"Import marks from this file"),
OPT_END()
};
/* we handle encodings */
git_config(git_default_config, NULL);
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);
if (import_filename)
import_marks(import_filename);
get_tags_and_duplicates(&revs.pending, &extra_refs);
if (prepare_revision_walk(&revs))
die("revision walk setup failed");
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);
if (export_filename)
export_marks(export_filename);
return 0;
}
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