mirror of
https://github.com/git/git.git
synced 2024-11-25 02:44:48 +08:00
8a912bcb25
This patch fixes all calls to xread() where the return value is not stored into an ssize_t. The patch should not have any effect whatsoever, other than putting better/more appropriate type names on variables. Signed-off-by: Johan Herland <johan@herland.net> Signed-off-by: Junio C Hamano <junkio@cox.net>
381 lines
9.8 KiB
C
381 lines
9.8 KiB
C
#include "cache.h"
|
|
#include "object.h"
|
|
#include "commit.h"
|
|
#include "diff.h"
|
|
#include "revision.h"
|
|
#include "list-objects.h"
|
|
#include "run-command.h"
|
|
|
|
/*
|
|
* Basic handler for bundle files to connect repositories via sneakernet.
|
|
* Invocation must include action.
|
|
* This function can create a bundle or provide information on an existing
|
|
* bundle supporting git-fetch, git-pull, and git-ls-remote
|
|
*/
|
|
|
|
static const char *bundle_usage="git-bundle (create <bundle> <git-rev-list args> | verify <bundle> | list-heads <bundle> [refname]... | unbundle <bundle> [refname]... )";
|
|
|
|
static const char bundle_signature[] = "# v2 git bundle\n";
|
|
|
|
struct ref_list {
|
|
unsigned int nr, alloc;
|
|
struct ref_list_entry {
|
|
unsigned char sha1[20];
|
|
char *name;
|
|
} *list;
|
|
};
|
|
|
|
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++;
|
|
}
|
|
|
|
struct bundle_header {
|
|
struct ref_list prerequisites;
|
|
struct ref_list references;
|
|
};
|
|
|
|
/* this function returns the length of the string */
|
|
static int read_string(int fd, char *buffer, int size)
|
|
{
|
|
int i;
|
|
for (i = 0; i < size - 1; i++) {
|
|
ssize_t count = xread(fd, buffer + i, 1);
|
|
if (count < 0)
|
|
return error("Read error: %s", strerror(errno));
|
|
if (count == 0) {
|
|
i--;
|
|
break;
|
|
}
|
|
if (buffer[i] == '\n')
|
|
break;
|
|
}
|
|
buffer[i + 1] = '\0';
|
|
return i + 1;
|
|
}
|
|
|
|
/* returns an fd */
|
|
static int read_header(const char *path, struct bundle_header *header) {
|
|
char buffer[1024];
|
|
int fd = open(path, O_RDONLY);
|
|
|
|
if (fd < 0)
|
|
return error("could not open '%s'", path);
|
|
if (read_string(fd, buffer, sizeof(buffer)) < 0 ||
|
|
strcmp(buffer, bundle_signature)) {
|
|
close(fd);
|
|
return error("'%s' does not look like a v2 bundle file", path);
|
|
}
|
|
while (read_string(fd, buffer, sizeof(buffer)) > 0
|
|
&& buffer[0] != '\n') {
|
|
int is_prereq = buffer[0] == '-';
|
|
int offset = is_prereq ? 1 : 0;
|
|
int len = strlen(buffer);
|
|
unsigned char sha1[20];
|
|
struct ref_list *list = is_prereq ? &header->prerequisites
|
|
: &header->references;
|
|
char delim;
|
|
|
|
if (buffer[len - 1] == '\n')
|
|
buffer[len - 1] = '\0';
|
|
if (get_sha1_hex(buffer + offset, sha1)) {
|
|
warning("unrecognized header: %s", buffer);
|
|
continue;
|
|
}
|
|
delim = buffer[40 + offset];
|
|
if (!isspace(delim) && (delim != '\0' || !is_prereq))
|
|
die ("invalid header: %s", buffer);
|
|
add_to_ref_list(sha1, isspace(delim) ?
|
|
buffer + 41 + offset : "", list);
|
|
}
|
|
return fd;
|
|
}
|
|
|
|
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)
|
|
|
|
static 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"};
|
|
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(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);
|
|
|
|
memset(&refs, 0, sizeof(struct object_array));
|
|
for (i = 0; i < revs.pending.nr; i++) {
|
|
struct object_array_entry *e = revs.pending.objects + i;
|
|
add_object_array(e->item, e->name, &refs);
|
|
}
|
|
|
|
prepare_revision_walk(&revs);
|
|
|
|
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(message);
|
|
error("%s %s", sha1_to_hex(refs.objects[i].item->sha1),
|
|
refs.objects[i].name);
|
|
}
|
|
|
|
for (i = 0; i < refs.nr; i++)
|
|
clear_commit_marks((struct commit *)refs.objects[i].item, -1);
|
|
|
|
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;
|
|
}
|
|
|
|
static int list_heads(struct bundle_header *header, int argc, const char **argv)
|
|
{
|
|
return list_refs(&header->references, argc, argv);
|
|
}
|
|
|
|
static int create_bundle(struct bundle_header *header, const char *path,
|
|
int argc, const char **argv)
|
|
{
|
|
int bundle_fd = -1;
|
|
const char **argv_boundary = xmalloc((argc + 4) * sizeof(const char *));
|
|
const char **argv_pack = xmalloc(5 * sizeof(const char *));
|
|
int i, ref_count = 0;
|
|
char buffer[1024];
|
|
struct rev_info revs;
|
|
struct child_process rls;
|
|
|
|
bundle_fd = (!strcmp(path, "-") ? 1 :
|
|
open(path, O_CREAT | O_EXCL | O_WRONLY, 0666));
|
|
if (bundle_fd < 0)
|
|
return error("Could not create '%s': %s", path, strerror(errno));
|
|
|
|
/* 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;
|
|
while ((i = read_string(rls.out, buffer, sizeof(buffer))) > 0) {
|
|
unsigned char sha1[20];
|
|
if (buffer[0] == '-') {
|
|
write_or_die(bundle_fd, buffer, i);
|
|
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;
|
|
}
|
|
}
|
|
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]);
|
|
|
|
for (i = 0; i < revs.pending.nr; i++) {
|
|
struct object_array_entry *e = revs.pending.objects + i;
|
|
unsigned char sha1[20];
|
|
char *ref;
|
|
|
|
if (e->item->flags & UNINTERESTING)
|
|
continue;
|
|
if (dwim_ref(e->name, strlen(e->name), sha1, &ref) != 1)
|
|
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.
|
|
*/
|
|
if (!(e->item->flags & SHOWN)) {
|
|
warning("ref '%s' is excluded by the rev-list options",
|
|
e->name);
|
|
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, ref, strlen(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";
|
|
argv_pack[2] = "--stdout";
|
|
argv_pack[3] = "--thin";
|
|
argv_pack[4] = 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");
|
|
for (i = 0; i < revs.pending.nr; i++) {
|
|
struct object *object = revs.pending.objects[i].item;
|
|
if (object->flags & UNINTERESTING)
|
|
write(rls.in, "^", 1);
|
|
write(rls.in, sha1_to_hex(object->sha1), 40);
|
|
write(rls.in, "\n", 1);
|
|
}
|
|
if (finish_command(&rls))
|
|
return error ("pack-objects died");
|
|
return 0;
|
|
}
|
|
|
|
static int unbundle(struct bundle_header *header, int bundle_fd,
|
|
int argc, const char **argv)
|
|
{
|
|
const char *argv_index_pack[] = {"index-pack",
|
|
"--fix-thin", "--stdin", NULL};
|
|
struct child_process ip;
|
|
|
|
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 list_heads(header, argc, argv);
|
|
}
|
|
|
|
int cmd_bundle(int argc, const char **argv, const char *prefix)
|
|
{
|
|
struct bundle_header header;
|
|
int nongit = 0;
|
|
const char *cmd, *bundle_file;
|
|
int bundle_fd = -1;
|
|
char buffer[PATH_MAX];
|
|
|
|
if (argc < 3)
|
|
usage(bundle_usage);
|
|
|
|
cmd = argv[1];
|
|
bundle_file = argv[2];
|
|
argc -= 2;
|
|
argv += 2;
|
|
|
|
prefix = setup_git_directory_gently(&nongit);
|
|
if (prefix && bundle_file[0] != '/') {
|
|
snprintf(buffer, sizeof(buffer), "%s/%s", prefix, bundle_file);
|
|
bundle_file = buffer;
|
|
}
|
|
|
|
memset(&header, 0, sizeof(header));
|
|
if (strcmp(cmd, "create") &&
|
|
(bundle_fd = read_header(bundle_file, &header)) < 0)
|
|
return 1;
|
|
|
|
if (!strcmp(cmd, "verify")) {
|
|
close(bundle_fd);
|
|
if (verify_bundle(&header, 1))
|
|
return 1;
|
|
fprintf(stderr, "%s is okay\n", bundle_file);
|
|
return 0;
|
|
}
|
|
if (!strcmp(cmd, "list-heads")) {
|
|
close(bundle_fd);
|
|
return !!list_heads(&header, argc, argv);
|
|
}
|
|
if (!strcmp(cmd, "create")) {
|
|
if (nongit)
|
|
die("Need a repository to create a bundle.");
|
|
return !!create_bundle(&header, bundle_file, argc, argv);
|
|
} else if (!strcmp(cmd, "unbundle")) {
|
|
if (nongit)
|
|
die("Need a repository to unbundle.");
|
|
return !!unbundle(&header, bundle_fd, argc, argv);
|
|
} else
|
|
usage(bundle_usage);
|
|
}
|