#include "cache.h"
+#include "pack.h"
#include "refs.h"
#include "pkt-line.h"
#include "run-command.h"
+#include "exec_cmd.h"
+#include "commit.h"
+#include "object.h"
#include <sys/wait.h>
static const char receive_pack_usage[] = "git-receive-pack <git-dir>";
-static const char *unpacker[] = { "unpack-objects", NULL };
-
+static int deny_non_fast_forwards = 0;
+static int unpack_limit = 100;
static int report_status;
-static char capabilities[] = "report-status";
+static char capabilities[] = " report-status delete-refs ";
static int capabilities_sent;
-static int show_ref(const char *path, const unsigned char *sha1)
+static int receive_pack_config(const char *var, const char *value)
+{
+ git_default_config(var, value);
+
+ if (strcmp(var, "receive.denynonfastforwards") == 0)
+ {
+ deny_non_fast_forwards = git_config_bool(var, value);
+ return 0;
+ }
+
+ if (strcmp(var, "receive.unpacklimit") == 0)
+ {
+ unpack_limit = git_config_int(var, value);
+ return 0;
+ }
+
+ return 0;
+}
+
+static int show_ref(const char *path, const unsigned char *sha1, int flag, void *cb_data)
{
if (capabilities_sent)
packet_write(1, "%s %s\n", sha1_to_hex(sha1), path);
static void write_head_info(void)
{
- for_each_ref(show_ref);
+ for_each_ref(show_ref, NULL);
if (!capabilities_sent)
- show_ref("capabilities^{}", null_sha1);
+ show_ref("capabilities^{}", null_sha1, 0, NULL);
}
static struct command *commands;
-static int is_all_zeroes(const char *hex)
-{
- int i;
- for (i = 0; i < 40; i++)
- if (*hex++ != '0')
- return 0;
- return 1;
-}
-
-static int verify_old_ref(const char *name, char *hex_contents)
-{
- int fd, ret;
- char buffer[60];
-
- if (is_all_zeroes(hex_contents))
- return 0;
- fd = open(name, O_RDONLY);
- if (fd < 0)
- return -1;
- ret = read(fd, buffer, 40);
- close(fd);
- if (ret != 40)
- return -1;
- if (memcmp(buffer, hex_contents, 40))
- return -1;
- return 0;
-}
-
static char update_hook[] = "hooks/update";
static int run_update_hook(const char *refname,
const char *name = cmd->ref_name;
unsigned char *old_sha1 = cmd->old_sha1;
unsigned char *new_sha1 = cmd->new_sha1;
- char new_hex[60], *old_hex, *lock_name;
- int newfd, namelen, written;
+ char new_hex[41], old_hex[41];
+ struct ref_lock *lock;
cmd->error_string = NULL;
if (!strncmp(name, "refs/", 5) && check_ref_format(name + 5)) {
name);
}
- namelen = strlen(name);
- lock_name = xmalloc(namelen + 10);
- memcpy(lock_name, name, namelen);
- memcpy(lock_name + namelen, ".lock", 6);
-
strcpy(new_hex, sha1_to_hex(new_sha1));
- old_hex = sha1_to_hex(old_sha1);
- if (!has_sha1_file(new_sha1)) {
+ strcpy(old_hex, sha1_to_hex(old_sha1));
+
+ if (!is_null_sha1(new_sha1) && !has_sha1_file(new_sha1)) {
cmd->error_string = "bad pack";
return error("unpack should have generated %s, "
"but I can't find it!", new_hex);
}
- safe_create_leading_directories(lock_name);
-
- newfd = open(lock_name, O_CREAT | O_EXCL | O_WRONLY, 0666);
- if (newfd < 0) {
- cmd->error_string = "can't lock";
- return error("unable to create %s (%s)",
- lock_name, strerror(errno));
- }
-
- /* Write the ref with an ending '\n' */
- new_hex[40] = '\n';
- new_hex[41] = 0;
- written = write(newfd, new_hex, 41);
- /* Remove the '\n' again */
- new_hex[40] = 0;
-
- close(newfd);
- if (written != 41) {
- unlink(lock_name);
- cmd->error_string = "can't write";
- return error("unable to write %s", lock_name);
- }
- if (verify_old_ref(name, old_hex) < 0) {
- unlink(lock_name);
- cmd->error_string = "raced";
- return error("%s changed during push", name);
+ if (deny_non_fast_forwards && !is_null_sha1(new_sha1) &&
+ !is_null_sha1(old_sha1) &&
+ !strncmp(name, "refs/heads/", 11)) {
+ struct commit *old_commit, *new_commit;
+ struct commit_list *bases, *ent;
+
+ old_commit = (struct commit *)parse_object(old_sha1);
+ new_commit = (struct commit *)parse_object(new_sha1);
+ bases = get_merge_bases(old_commit, new_commit, 1);
+ for (ent = bases; ent; ent = ent->next)
+ if (!hashcmp(old_sha1, ent->item->object.sha1))
+ break;
+ free_commit_list(bases);
+ if (!ent)
+ return error("denying non-fast forward;"
+ " you should pull first");
}
if (run_update_hook(name, old_hex, new_hex)) {
- unlink(lock_name);
cmd->error_string = "hook declined";
return error("hook declined to update %s", name);
}
- else if (rename(lock_name, name) < 0) {
- unlink(lock_name);
- cmd->error_string = "can't rename";
- return error("unable to replace %s", name);
+
+ if (is_null_sha1(new_sha1)) {
+ if (delete_ref(name, old_sha1)) {
+ cmd->error_string = "failed to delete";
+ return error("failed to delete %s", name);
+ }
+ fprintf(stderr, "%s: %s -> deleted\n", name, old_hex);
}
else {
+ lock = lock_any_ref_for_update(name, old_sha1);
+ if (!lock) {
+ cmd->error_string = "failed to lock";
+ return error("failed to lock %s", name);
+ }
+ write_ref_sha1(lock, new_sha1, "push");
fprintf(stderr, "%s: %s -> %s\n", name, old_hex, new_hex);
- return 0;
}
+ return 0;
}
static char update_post_hook[] = "hooks/post-update";
}
}
-static const char *unpack(int *error_code)
+static const char *parse_pack_header(struct pack_header *hdr)
{
- int code = run_command_v_opt(1, unpacker, RUN_GIT_CMD);
+ char *c = (char*)hdr;
+ ssize_t remaining = sizeof(struct pack_header);
+ do {
+ ssize_t r = xread(0, c, remaining);
+ if (r <= 0)
+ return "eof before pack header was fully read";
+ remaining -= r;
+ c += r;
+ } while (remaining > 0);
+ if (hdr->hdr_signature != htonl(PACK_SIGNATURE))
+ return "protocol error (pack signature mismatch detected)";
+ if (!pack_version_ok(hdr->hdr_version))
+ return "protocol error (pack version unsupported)";
+ return NULL;
+}
- *error_code = 0;
- switch (code) {
- case 0:
- return NULL;
- case -ERR_RUN_COMMAND_FORK:
- return "unpack fork failed";
- case -ERR_RUN_COMMAND_EXEC:
- return "unpack execute failed";
- case -ERR_RUN_COMMAND_WAITPID:
- return "waitpid failed";
- case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
- return "waitpid is confused";
- case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
- return "unpacker died of signal";
- case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
- return "unpacker died strangely";
- default:
- *error_code = -code;
- return "unpacker exited with error code";
+static const char *pack_lockfile;
+
+static const char *unpack(void)
+{
+ struct pack_header hdr;
+ const char *hdr_err;
+ char hdr_arg[38];
+
+ hdr_err = parse_pack_header(&hdr);
+ if (hdr_err)
+ return hdr_err;
+ snprintf(hdr_arg, sizeof(hdr_arg), "--pack_header=%u,%u",
+ ntohl(hdr.hdr_version), ntohl(hdr.hdr_entries));
+
+ if (ntohl(hdr.hdr_entries) < unpack_limit) {
+ int code;
+ const char *unpacker[3];
+ unpacker[0] = "unpack-objects";
+ unpacker[1] = hdr_arg;
+ unpacker[2] = NULL;
+ code = run_command_v_opt(1, unpacker, RUN_GIT_CMD);
+ switch (code) {
+ case 0:
+ return NULL;
+ case -ERR_RUN_COMMAND_FORK:
+ return "unpack fork failed";
+ case -ERR_RUN_COMMAND_EXEC:
+ return "unpack execute failed";
+ case -ERR_RUN_COMMAND_WAITPID:
+ return "waitpid failed";
+ case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
+ return "waitpid is confused";
+ case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
+ return "unpacker died of signal";
+ case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
+ return "unpacker died strangely";
+ default:
+ return "unpacker exited with error code";
+ }
+ } else {
+ const char *keeper[6];
+ int fd[2], s, len, status;
+ pid_t pid;
+ char keep_arg[256];
+ char packname[46];
+
+ s = sprintf(keep_arg, "--keep=receive-pack %i on ", getpid());
+ if (gethostname(keep_arg + s, sizeof(keep_arg) - s))
+ strcpy(keep_arg + s, "localhost");
+
+ keeper[0] = "index-pack";
+ keeper[1] = "--stdin";
+ keeper[2] = "--fix-thin";
+ keeper[3] = hdr_arg;
+ keeper[4] = keep_arg;
+ keeper[5] = NULL;
+
+ if (pipe(fd) < 0)
+ return "index-pack pipe failed";
+ pid = fork();
+ if (pid < 0)
+ return "index-pack fork failed";
+ if (!pid) {
+ dup2(fd[1], 1);
+ close(fd[1]);
+ close(fd[0]);
+ execv_git_cmd(keeper);
+ die("execv of index-pack failed");
+ }
+ close(fd[1]);
+
+ /*
+ * The first thing we expects from index-pack's output
+ * is "pack\t%40s\n" or "keep\t%40s\n" (46 bytes) where
+ * %40s is the newly created pack SHA1 name. In the "keep"
+ * case, we need it to remove the corresponding .keep file
+ * later on. If we don't get that then tough luck with it.
+ */
+ for (len = 0;
+ len < 46 && (s = xread(fd[0], packname+len, 46-len)) > 0;
+ len += s);
+ close(fd[0]);
+ if (len == 46 && packname[45] == '\n' &&
+ memcmp(packname, "keep\t", 5) == 0) {
+ char path[PATH_MAX];
+ packname[45] = 0;
+ snprintf(path, sizeof(path), "%s/pack/pack-%s.keep",
+ get_object_directory(), packname + 5);
+ pack_lockfile = xstrdup(path);
+ }
+
+ /* Then wrap our index-pack process. */
+ while (waitpid(pid, &status, 0) < 0)
+ if (errno != EINTR)
+ return "waitpid failed";
+ if (WIFEXITED(status)) {
+ int code = WEXITSTATUS(status);
+ if (code)
+ return "index-pack exited with error code";
+ reprepare_packed_git();
+ return NULL;
+ }
+ return "index-pack abnormal exit";
}
}
packet_flush(1);
}
+static int delete_only(struct command *cmd)
+{
+ while (cmd) {
+ if (!is_null_sha1(cmd->new_sha1))
+ return 0;
+ cmd = cmd->next;
+ }
+ return 1;
+}
+
int main(int argc, char **argv)
{
int i;
if (!dir)
usage(receive_pack_usage);
- if(!enter_repo(dir, 0))
+ if (!enter_repo(dir, 0))
die("'%s': unable to chdir or not a git archive", dir);
+ setup_ident();
+ git_config(receive_pack_config);
+
write_head_info();
/* EOF */
read_head_info();
if (commands) {
- int code;
- const char *unpack_status = unpack(&code);
+ const char *unpack_status = NULL;
+
+ if (!delete_only(commands))
+ unpack_status = unpack();
if (!unpack_status)
execute_commands();
+ if (pack_lockfile)
+ unlink(pack_lockfile);
if (report_status)
report(unpack_status);
}