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#include "cache.h"
#include "bundle.h"
#include "object.h"
#include "commit.h"
#include "diff.h"
#include "revision.h"
#include "list-objects.h"
#include "run-command.h"
#include "refs.h"

static const char bundle_signature[] = "# v2 git bundle\n";

static void add_to_ref_list(const unsigned char *sha1, const char *name,
struct ref_list *list)
{
if (list->nr + 1 >= list->alloc) {
list->alloc = alloc_nr(list->nr + 1);
list->list = xrealloc(list->list,
list->alloc * sizeof(list->list[0]));
}
memcpy(list->list[list->nr].sha1, sha1, 20);
list->list[list->nr].name = xstrdup(name);
list->nr++;
}

/* Eventually this should go to strbuf.[ch] */
static int strbuf_readline_fd(struct strbuf *sb, int fd)
{
strbuf_reset(sb);

while (1) {
char ch;
ssize_t len = xread(fd, &ch, 1);
if (len < 0)
return -1;
strbuf_addch(sb, ch);
if (ch == '\n')
break;
}
return 0;
}

static int parse_bundle_header(int fd, struct bundle_header *header,
const char *report_path)
{
struct strbuf buf = STRBUF_INIT;
int status = 0;

/* The bundle header begins with the signature */
if (strbuf_readline_fd(&buf, fd) ||
strcmp(buf.buf, bundle_signature)) {
if (report_path)
error("'%s' does not look like a v2 bundle file",
report_path);
status = -1;
goto abort;
}

/* The bundle header ends with an empty line */
while (!strbuf_readline_fd(&buf, fd) &&
buf.len && buf.buf[0] != '\n') {
unsigned char sha1[20];
int is_prereq = 0;

if (*buf.buf == '-') {
is_prereq = 1;
strbuf_remove(&buf, 0, 1);
}
strbuf_rtrim(&buf);

/*
* Tip lines have object name, SP, and refname.
* Prerequisites have object name that is optionally
* followed by SP and subject line.
*/
if (get_sha1_hex(buf.buf, sha1) ||
(40 <= buf.len && !isspace(buf.buf[40])) ||
(!is_prereq && buf.len <= 40)) {
if (report_path)
error("unrecognized header: %s%s (%d)",
(is_prereq ? "-" : ""), buf.buf, (int)buf.len);
status = -1;
break;
} else {
if (is_prereq)
add_to_ref_list(sha1, "", &header->prerequisites);
else
add_to_ref_list(sha1, buf.buf + 41, &header->references);
}
}

 abort:
if (status) {
close(fd);
fd = -1;
}
strbuf_release(&buf);
return fd;
}

int read_bundle_header(const char *path, struct bundle_header *header)
{
int fd = open(path, O_RDONLY);

if (fd < 0)
return error("could not open '%s'", path);
return parse_bundle_header(fd, header, path);
}

int is_bundle(const char *path, int quiet)
{
struct bundle_header header;
int fd = open(path, O_RDONLY);

if (fd < 0)
return 0;
memset(&header, 0, sizeof(header));
fd = parse_bundle_header(fd, &header, quiet ? NULL : path);
if (fd >= 0)
close(fd);
return (fd >= 0);
}

static int list_refs(struct ref_list *r, int argc, const char **argv)
{
int i;

for (i = 0; i < r->nr; i++) {
if (argc > 1) {
int j;
for (j = 1; j < argc; j++)
if (!strcmp(r->list[i].name, argv[j]))
break;
if (j == argc)
continue;
}
printf("%s %s\n", sha1_to_hex(r->list[i].sha1),
r->list[i].name);
}
return 0;
}

#define PREREQ_MARK (1u<<16)

int verify_bundle(struct bundle_header *header, int verbose)
{
/*
* Do fast check, then if any prereqs are missing then go line by line
* to be verbose about the errors
*/
struct ref_list *p = &header->prerequisites;
struct rev_info revs;
const char *argv[] = {NULL, "--all", NULL};
struct object_array refs;
struct commit *commit;
int i, ret = 0, req_nr;
const char *message = "Repository lacks these prerequisite commits:";

init_revisions(&revs, NULL);
for (i = 0; i < p->nr; i++) {
struct ref_list_entry *e = p->list + i;
struct object *o = parse_object(e->sha1);
if (o) {
o->flags |= PREREQ_MARK;
add_pending_object(&revs, o, e->name);
continue;
}
if (++ret == 1)
error("%s", message);
error("%s %s", sha1_to_hex(e->sha1), e->name);
}
if (revs.pending.nr != p->nr)
return ret;
req_nr = revs.pending.nr;
setup_revisions(2, argv, &revs, NULL);

refs = revs.pending;
revs.leak_pending = 1;

if (prepare_revision_walk(&revs))
die("revision walk setup failed");

i = req_nr;
while (i && (commit = get_revision(&revs)))
if (commit->object.flags & PREREQ_MARK)
i--;

for (i = 0; i < req_nr; i++)
if (!(refs.objects[i].item->flags & SHOWN)) {
if (++ret == 1)
error("%s", message);
error("%s %s", sha1_to_hex(refs.objects[i].item->sha1),
refs.objects[i].name);
}

clear_commit_marks_for_object_array(&refs, ALL_REV_FLAGS);
free(refs.objects);

if (verbose) {
struct ref_list *r;

r = &header->references;
printf("The bundle contains %d ref%s\n",
r->nr, (1 < r->nr) ? "s" : "");
list_refs(r, 0, NULL);
r = &header->prerequisites;
printf("The bundle requires these %d ref%s\n",
r->nr, (1 < r->nr) ? "s" : "");
list_refs(r, 0, NULL);
}
return ret;
}

int list_bundle_refs(struct bundle_header *header, int argc, const char **argv)
{
return list_refs(&header->references, argc, argv);
}

static int is_tag_in_date_range(struct object *tag, struct rev_info *revs)
{
unsigned long size;
enum object_type type;
char *buf, *line, *lineend;
unsigned long date;

if (revs->max_age == -1 && revs->min_age == -1)
return 1;

buf = read_sha1_file(tag->sha1, &type, &size);
if (!buf)
return 1;
line = memmem(buf, size, "\ntagger ", 8);
if (!line++)
return 1;
lineend = memchr(line, buf + size - line, '\n');
line = memchr(line, lineend ? lineend - line : buf + size - line, '>');
if (!line++)
return 1;
date = strtoul(line, NULL, 10);
free(buf);
return (revs->max_age == -1 || revs->max_age < date) &&
(revs->min_age == -1 || revs->min_age > date);
}

int create_bundle(struct bundle_header *header, const char *path,
int argc, const char **argv)
{
static struct lock_file lock;
int bundle_fd = -1;
int bundle_to_stdout;
const char **argv_boundary = xmalloc((argc + 4) * sizeof(const char *));
const char **argv_pack = xmalloc(6 * sizeof(const char *));
int i, ref_count = 0;
char buffer[1024];
struct rev_info revs;
struct child_process rls;
FILE *rls_fout;

bundle_to_stdout = !strcmp(path, "-");
if (bundle_to_stdout)
bundle_fd = 1;
else
bundle_fd = hold_lock_file_for_update(&lock, path,
LOCK_DIE_ON_ERROR);

/* write signature */
write_or_die(bundle_fd, bundle_signature, strlen(bundle_signature));

/* init revs to list objects for pack-objects later */
save_commit_buffer = 0;
init_revisions(&revs, NULL);

/* write prerequisites */
memcpy(argv_boundary + 3, argv + 1, argc * sizeof(const char *));
argv_boundary[0] = "rev-list";
argv_boundary[1] = "--boundary";
argv_boundary[2] = "--pretty=oneline";
argv_boundary[argc + 2] = NULL;
memset(&rls, 0, sizeof(rls));
rls.argv = argv_boundary;
rls.out = -1;
rls.git_cmd = 1;
if (start_command(&rls))
return -1;
rls_fout = xfdopen(rls.out, "r");
while (fgets(buffer, sizeof(buffer), rls_fout)) {
unsigned char sha1[20];
if (buffer[0] == '-') {
write_or_die(bundle_fd, buffer, strlen(buffer));
if (!get_sha1_hex(buffer + 1, sha1)) {
struct object *object = parse_object(sha1);
object->flags |= UNINTERESTING;
add_pending_object(&revs, object, buffer);
}
} else if (!get_sha1_hex(buffer, sha1)) {
struct object *object = parse_object(sha1);
object->flags |= SHOWN;
}
}
fclose(rls_fout);
if (finish_command(&rls))
return error("rev-list died");

/* write references */
argc = setup_revisions(argc, argv, &revs, NULL);

if (argc > 1)
return error("unrecognized argument: %s'", argv[1]);

object_array_remove_duplicates(&revs.pending);

for (i = 0; i < revs.pending.nr; i++) {
struct object_array_entry *e = revs.pending.objects + i;
unsigned char sha1[20];
char *ref;
const char *display_ref;
int flag;

if (e->item->flags & UNINTERESTING)
continue;
if (dwim_ref(e->name, strlen(e->name), sha1, &ref) != 1)
continue;
if (!resolve_ref(e->name, sha1, 1, &flag))
flag = 0;
display_ref = (flag & REF_ISSYMREF) ? e->name : ref;

if (e->item->type == OBJ_TAG &&
!is_tag_in_date_range(e->item, &revs)) {
e->item->flags |= UNINTERESTING;
continue;
}

/*
* Make sure the refs we wrote out is correct; --max-count and
* other limiting options could have prevented all the tips
* from getting output.
*
* Non commit objects such as tags and blobs do not have
* this issue as they are not affected by those extra
* constraints.
*/
if (!(e->item->flags & SHOWN) && e->item->type == OBJ_COMMIT) {
warning("ref '%s' is excluded by the rev-list options",
e->name);
free(ref);
continue;
}
/*
* If you run "git bundle create bndl v1.0..v2.0", the
* name of the positive ref is "v2.0" but that is the
* commit that is referenced by the tag, and not the tag
* itself.
*/
if (hashcmp(sha1, e->item->sha1)) {
/*
* Is this the positive end of a range expressed
* in terms of a tag (e.g. v2.0 from the range
* "v1.0..v2.0")?
*/
struct commit *one = lookup_commit_reference(sha1);
struct object *obj;

if (e->item == &(one->object)) {
/*
* Need to include e->name as an
* independent ref to the pack-objects
* input, so that the tag is included
* in the output; otherwise we would
* end up triggering "empty bundle"
* error.
*/
obj = parse_object(sha1);
obj->flags |= SHOWN;
add_pending_object(&revs, obj, e->name);
}
free(ref);
continue;
}

ref_count++;
write_or_die(bundle_fd, sha1_to_hex(e->item->sha1), 40);
write_or_die(bundle_fd, " ", 1);
write_or_die(bundle_fd, display_ref, strlen(display_ref));
write_or_die(bundle_fd, "\n", 1);
free(ref);
}
if (!ref_count)
die ("Refusing to create empty bundle.");

/* end header */
write_or_die(bundle_fd, "\n", 1);

/* write pack */
argv_pack[0] = "pack-objects";
argv_pack[1] = "--all-progress-implied";
argv_pack[2] = "--stdout";
argv_pack[3] = "--thin";
argv_pack[4] = "--delta-base-offset";
argv_pack[5] = NULL;
memset(&rls, 0, sizeof(rls));
rls.argv = argv_pack;
rls.in = -1;
rls.out = bundle_fd;
rls.git_cmd = 1;
if (start_command(&rls))
return error("Could not spawn pack-objects");

/*
* start_command closed bundle_fd if it was > 1
* so set the lock fd to -1 so commit_lock_file()
* won't fail trying to close it.
*/
lock.fd = -1;

for (i = 0; i < revs.pending.nr; i++) {
struct object *object = revs.pending.objects[i].item;
if (object->flags & UNINTERESTING)
write_or_die(rls.in, "^", 1);
write_or_die(rls.in, sha1_to_hex(object->sha1), 40);
write_or_die(rls.in, "\n", 1);
}
close(rls.in);
if (finish_command(&rls))
return error ("pack-objects died");
if (!bundle_to_stdout) {
if (commit_lock_file(&lock))
die_errno("cannot create '%s'", path);
}
return 0;
}

int unbundle(struct bundle_header *header, int bundle_fd, int flags)
{
const char *argv_index_pack[] = {"index-pack",
"--fix-thin", "--stdin", NULL, NULL};
struct child_process ip;

if (flags & BUNDLE_VERBOSE)
argv_index_pack[3] = "-v";

if (verify_bundle(header, 0))
return -1;
memset(&ip, 0, sizeof(ip));
ip.argv = argv_index_pack;
ip.in = bundle_fd;
ip.no_stdout = 1;
ip.git_cmd = 1;
if (run_command(&ip))
return error("index-pack died");
return 0;
}
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