git/bundle.c at master · fractalspace/git · GitHub

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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++;

}

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_getwholeline_fd(&buf, fd, '\n') ||

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_getwholeline_fd(&buf, fd, '\n') &&

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_ln(Q_("The bundle contains %d ref",

"The bundle contains %d refs",

r->nr),

r->nr);

list_refs(r, 0, NULL);

if (!r->nr) {

printf_ln(_("The bundle records a complete history."));

} else {

r = &header->prerequisites;

printf_ln(Q_("The bundle requires this ref",

"The bundle requires these %d refs",

r->nr),

r->nr);

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;

struct strbuf buf = STRBUF_INIT;

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 (strbuf_getwholeline(&buf, rls_fout, '\n') != EOF) {

unsigned char sha1[20];

if (buf.len > 0 && buf.buf[0] == '-') {

write_or_die(bundle_fd, buf.buf, buf.len);

if (!get_sha1_hex(buf.buf + 1, sha1)) {

struct object *object = parse_object(sha1);

object->flags |= UNINTERESTING;

add_pending_object(&revs, object, xstrdup(buf.buf));

}

} else if (!get_sha1_hex(buf.buf, sha1)) {

struct object *object = parse_object(sha1);

object->flags |= SHOWN;

}

strbuf_release(&buf);

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 (read_ref_full(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;

}

git/bundle.c at master · fractalspace/git · GitHub

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