receive-pack: make it a builtin

It is a good thing to do in general, but more importantly, transport
routines can only be used by built-ins, which is what I'll be adding next.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/Makefile b/Makefile
index f4c31c8714e33efe8c88b152fb8cc3cbf3bb3f16..f9c54ffd2f1de5698ce1bafcd42fb9260e252e00 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -294,7 +294,6 @@ PROGRAMS += git-mktag$X
 PROGRAMS += git-mktree$X
 PROGRAMS += git-pack-redundant$X
 PROGRAMS += git-patch-id$X
-PROGRAMS += git-receive-pack$X
 PROGRAMS += git-send-pack$X
 PROGRAMS += git-shell$X
 PROGRAMS += git-show-index$X
@@ -546,6 +545,7 @@ BUILTIN_OBJS += builtin-prune-packed.o
 BUILTIN_OBJS += builtin-prune.o
 BUILTIN_OBJS += builtin-push.o
 BUILTIN_OBJS += builtin-read-tree.o
+BUILTIN_OBJS += builtin-receive-pack.o
 BUILTIN_OBJS += builtin-reflog.o
 BUILTIN_OBJS += builtin-remote.o
 BUILTIN_OBJS += builtin-rerere.o

diff --git a/builtin-receive-pack.c b/builtin-receive-pack.c
new file mode 100644 (file)
index 0000000..6d6027e
--- /dev/null
+++ b/builtin-receive-pack.c
@@ -0,0 +1,520 @@
+#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"
+
+static const char receive_pack_usage[] = "git-receive-pack <git-dir>";
+
+static int deny_non_fast_forwards = 0;
+static int receive_fsck_objects;
+static int receive_unpack_limit = -1;
+static int transfer_unpack_limit = -1;
+static int unpack_limit = 100;
+static int report_status;
+
+static char capabilities[] = " report-status delete-refs ";
+static int capabilities_sent;
+
+static int receive_pack_config(const char *var, const char *value, void *cb)
+{
+       if (strcmp(var, "receive.denynonfastforwards") == 0) {
+               deny_non_fast_forwards = git_config_bool(var, value);
+               return 0;
+       }
+
+       if (strcmp(var, "receive.unpacklimit") == 0) {
+               receive_unpack_limit = git_config_int(var, value);
+               return 0;
+       }
+
+       if (strcmp(var, "transfer.unpacklimit") == 0) {
+               transfer_unpack_limit = git_config_int(var, value);
+               return 0;
+       }
+
+       if (strcmp(var, "receive.fsckobjects") == 0) {
+               receive_fsck_objects = git_config_bool(var, value);
+               return 0;
+       }
+
+       return git_default_config(var, value, cb);
+}
+
+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);
+       else
+               packet_write(1, "%s %s%c%s\n",
+                            sha1_to_hex(sha1), path, 0, capabilities);
+       capabilities_sent = 1;
+       return 0;
+}
+
+static void write_head_info(void)
+{
+       for_each_ref(show_ref, NULL);
+       if (!capabilities_sent)
+               show_ref("capabilities^{}", null_sha1, 0, NULL);
+
+}
+
+struct command {
+       struct command *next;
+       const char *error_string;
+       unsigned char old_sha1[20];
+       unsigned char new_sha1[20];
+       char ref_name[FLEX_ARRAY]; /* more */
+};
+
+static struct command *commands;
+
+static const char pre_receive_hook[] = "hooks/pre-receive";
+static const char post_receive_hook[] = "hooks/post-receive";
+
+static int hook_status(int code, const char *hook_name)
+{
+       switch (code) {
+       case 0:
+               return 0;
+       case -ERR_RUN_COMMAND_FORK:
+               return error("hook fork failed");
+       case -ERR_RUN_COMMAND_EXEC:
+               return error("hook execute failed");
+       case -ERR_RUN_COMMAND_PIPE:
+               return error("hook pipe failed");
+       case -ERR_RUN_COMMAND_WAITPID:
+               return error("waitpid failed");
+       case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
+               return error("waitpid is confused");
+       case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
+               return error("%s died of signal", hook_name);
+       case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
+               return error("%s died strangely", hook_name);
+       default:
+               error("%s exited with error code %d", hook_name, -code);
+               return -code;
+       }
+}
+
+static int run_hook(const char *hook_name)
+{
+       static char buf[sizeof(commands->old_sha1) * 2 + PATH_MAX + 4];
+       struct command *cmd;
+       struct child_process proc;
+       const char *argv[2];
+       int have_input = 0, code;
+
+       for (cmd = commands; !have_input && cmd; cmd = cmd->next) {
+               if (!cmd->error_string)
+                       have_input = 1;
+       }
+
+       if (!have_input || access(hook_name, X_OK) < 0)
+               return 0;
+
+       argv[0] = hook_name;
+       argv[1] = NULL;
+
+       memset(&proc, 0, sizeof(proc));
+       proc.argv = argv;
+       proc.in = -1;
+       proc.stdout_to_stderr = 1;
+
+       code = start_command(&proc);
+       if (code)
+               return hook_status(code, hook_name);
+       for (cmd = commands; cmd; cmd = cmd->next) {
+               if (!cmd->error_string) {
+                       size_t n = snprintf(buf, sizeof(buf), "%s %s %s\n",
+                               sha1_to_hex(cmd->old_sha1),
+                               sha1_to_hex(cmd->new_sha1),
+                               cmd->ref_name);
+                       if (write_in_full(proc.in, buf, n) != n)
+                               break;
+               }
+       }
+       close(proc.in);
+       return hook_status(finish_command(&proc), hook_name);
+}
+
+static int run_update_hook(struct command *cmd)
+{
+       static const char update_hook[] = "hooks/update";
+       struct child_process proc;
+       const char *argv[5];
+
+       if (access(update_hook, X_OK) < 0)
+               return 0;
+
+       argv[0] = update_hook;
+       argv[1] = cmd->ref_name;
+       argv[2] = sha1_to_hex(cmd->old_sha1);
+       argv[3] = sha1_to_hex(cmd->new_sha1);
+       argv[4] = NULL;
+
+       memset(&proc, 0, sizeof(proc));
+       proc.argv = argv;
+       proc.no_stdin = 1;
+       proc.stdout_to_stderr = 1;
+
+       return hook_status(run_command(&proc), update_hook);
+}
+
+static const char *update(struct command *cmd)
+{
+       const char *name = cmd->ref_name;
+       unsigned char *old_sha1 = cmd->old_sha1;
+       unsigned char *new_sha1 = cmd->new_sha1;
+       struct ref_lock *lock;
+
+       /* only refs/... are allowed */
+       if (prefixcmp(name, "refs/") || check_ref_format(name + 5)) {
+               error("refusing to create funny ref '%s' remotely", name);
+               return "funny refname";
+       }
+
+       if (!is_null_sha1(new_sha1) && !has_sha1_file(new_sha1)) {
+               error("unpack should have generated %s, "
+                     "but I can't find it!", sha1_to_hex(new_sha1));
+               return "bad pack";
+       }
+       if (deny_non_fast_forwards && !is_null_sha1(new_sha1) &&
+           !is_null_sha1(old_sha1) &&
+           !prefixcmp(name, "refs/heads/")) {
+               struct object *old_object, *new_object;
+               struct commit *old_commit, *new_commit;
+               struct commit_list *bases, *ent;
+
+               old_object = parse_object(old_sha1);
+               new_object = parse_object(new_sha1);
+
+               if (!old_object || !new_object ||
+                   old_object->type != OBJ_COMMIT ||
+                   new_object->type != OBJ_COMMIT) {
+                       error("bad sha1 objects for %s", name);
+                       return "bad ref";
+               }
+               old_commit = (struct commit *)old_object;
+               new_commit = (struct commit *)new_object;
+               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) {
+                       error("denying non-fast forward %s"
+                             " (you should pull first)", name);
+                       return "non-fast forward";
+               }
+       }
+       if (run_update_hook(cmd)) {
+               error("hook declined to update %s", name);
+               return "hook declined";
+       }
+
+       if (is_null_sha1(new_sha1)) {
+               if (!parse_object(old_sha1)) {
+                       warning ("Allowing deletion of corrupt ref.");
+                       old_sha1 = NULL;
+               }
+               if (delete_ref(name, old_sha1)) {
+                       error("failed to delete %s", name);
+                       return "failed to delete";
+               }
+               return NULL; /* good */
+       }
+       else {
+               lock = lock_any_ref_for_update(name, old_sha1, 0);
+               if (!lock) {
+                       error("failed to lock %s", name);
+                       return "failed to lock";
+               }
+               if (write_ref_sha1(lock, new_sha1, "push")) {
+                       return "failed to write"; /* error() already called */
+               }
+               return NULL; /* good */
+       }
+}
+
+static char update_post_hook[] = "hooks/post-update";
+
+static void run_update_post_hook(struct command *cmd)
+{
+       struct command *cmd_p;
+       int argc;
+       const char **argv;
+
+       for (argc = 0, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
+               if (cmd_p->error_string)
+                       continue;
+               argc++;
+       }
+       if (!argc || access(update_post_hook, X_OK) < 0)
+               return;
+       argv = xmalloc(sizeof(*argv) * (2 + argc));
+       argv[0] = update_post_hook;
+
+       for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
+               char *p;
+               if (cmd_p->error_string)
+                       continue;
+               p = xmalloc(strlen(cmd_p->ref_name) + 1);
+               strcpy(p, cmd_p->ref_name);
+               argv[argc] = p;
+               argc++;
+       }
+       argv[argc] = NULL;
+       run_command_v_opt(argv, RUN_COMMAND_NO_STDIN
+               | RUN_COMMAND_STDOUT_TO_STDERR);
+}
+
+static void execute_commands(const char *unpacker_error)
+{
+       struct command *cmd = commands;
+
+       if (unpacker_error) {
+               while (cmd) {
+                       cmd->error_string = "n/a (unpacker error)";
+                       cmd = cmd->next;
+               }
+               return;
+       }
+
+       if (run_hook(pre_receive_hook)) {
+               while (cmd) {
+                       cmd->error_string = "pre-receive hook declined";
+                       cmd = cmd->next;
+               }
+               return;
+       }
+
+       while (cmd) {
+               cmd->error_string = update(cmd);
+               cmd = cmd->next;
+       }
+}
+
+static void read_head_info(void)
+{
+       struct command **p = &commands;
+       for (;;) {
+               static char line[1000];
+               unsigned char old_sha1[20], new_sha1[20];
+               struct command *cmd;
+               char *refname;
+               int len, reflen;
+
+               len = packet_read_line(0, line, sizeof(line));
+               if (!len)
+                       break;
+               if (line[len-1] == '\n')
+                       line[--len] = 0;
+               if (len < 83 ||
+                   line[40] != ' ' ||
+                   line[81] != ' ' ||
+                   get_sha1_hex(line, old_sha1) ||
+                   get_sha1_hex(line + 41, new_sha1))
+                       die("protocol error: expected old/new/ref, got '%s'",
+                           line);
+
+               refname = line + 82;
+               reflen = strlen(refname);
+               if (reflen + 82 < len) {
+                       if (strstr(refname + reflen + 1, "report-status"))
+                               report_status = 1;
+               }
+               cmd = xmalloc(sizeof(struct command) + len - 80);
+               hashcpy(cmd->old_sha1, old_sha1);
+               hashcpy(cmd->new_sha1, new_sha1);
+               memcpy(cmd->ref_name, line + 82, len - 81);
+               cmd->error_string = NULL;
+               cmd->next = NULL;
+               *p = cmd;
+               p = &cmd->next;
+       }
+}
+
+static const char *parse_pack_header(struct pack_header *hdr)
+{
+       switch (read_pack_header(0, hdr)) {
+       case PH_ERROR_EOF:
+               return "eof before pack header was fully read";
+
+       case PH_ERROR_PACK_SIGNATURE:
+               return "protocol error (pack signature mismatch detected)";
+
+       case PH_ERROR_PROTOCOL:
+               return "protocol error (pack version unsupported)";
+
+       default:
+               return "unknown error in parse_pack_header";
+
+       case 0:
+               return NULL;
+       }
+}
+
+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=%"PRIu32",%"PRIu32,
+                       ntohl(hdr.hdr_version), ntohl(hdr.hdr_entries));
+
+       if (ntohl(hdr.hdr_entries) < unpack_limit) {
+               int code, i = 0;
+               const char *unpacker[4];
+               unpacker[i++] = "unpack-objects";
+               if (receive_fsck_objects)
+                       unpacker[i++] = "--strict";
+               unpacker[i++] = hdr_arg;
+               unpacker[i++] = NULL;
+               code = run_command_v_opt(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[7];
+               int s, status, i = 0;
+               char keep_arg[256];
+               struct child_process ip;
+
+               s = sprintf(keep_arg, "--keep=receive-pack %"PRIuMAX" on ", (uintmax_t) getpid());
+               if (gethostname(keep_arg + s, sizeof(keep_arg) - s))
+                       strcpy(keep_arg + s, "localhost");
+
+               keeper[i++] = "index-pack";
+               keeper[i++] = "--stdin";
+               if (receive_fsck_objects)
+                       keeper[i++] = "--strict";
+               keeper[i++] = "--fix-thin";
+               keeper[i++] = hdr_arg;
+               keeper[i++] = keep_arg;
+               keeper[i++] = NULL;
+               memset(&ip, 0, sizeof(ip));
+               ip.argv = keeper;
+               ip.out = -1;
+               ip.git_cmd = 1;
+               if (start_command(&ip))
+                       return "index-pack fork failed";
+               pack_lockfile = index_pack_lockfile(ip.out);
+               close(ip.out);
+               status = finish_command(&ip);
+               if (!status) {
+                       reprepare_packed_git();
+                       return NULL;
+               }
+               return "index-pack abnormal exit";
+       }
+}
+
+static void report(const char *unpack_status)
+{
+       struct command *cmd;
+       packet_write(1, "unpack %s\n",
+                    unpack_status ? unpack_status : "ok");
+       for (cmd = commands; cmd; cmd = cmd->next) {
+               if (!cmd->error_string)
+                       packet_write(1, "ok %s\n",
+                                    cmd->ref_name);
+               else
+                       packet_write(1, "ng %s %s\n",
+                                    cmd->ref_name, cmd->error_string);
+       }
+       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 cmd_receive_pack(int argc, const char **argv, const char *prefix)
+{
+       int i;
+       char *dir = NULL;
+
+       argv++;
+       for (i = 1; i < argc; i++) {
+               const char *arg = *argv++;
+
+               if (*arg == '-') {
+                       /* Do flag handling here */
+                       usage(receive_pack_usage);
+               }
+               if (dir)
+                       usage(receive_pack_usage);
+               dir = xstrdup(arg);
+       }
+       if (!dir)
+               usage(receive_pack_usage);
+
+       setup_path();
+
+       if (!enter_repo(dir, 0))
+               die("'%s': unable to chdir or not a git archive", dir);
+
+       if (is_repository_shallow())
+               die("attempt to push into a shallow repository");
+
+       git_config(receive_pack_config, NULL);
+
+       if (0 <= transfer_unpack_limit)
+               unpack_limit = transfer_unpack_limit;
+       else if (0 <= receive_unpack_limit)
+               unpack_limit = receive_unpack_limit;
+
+       write_head_info();
+
+       /* EOF */
+       packet_flush(1);
+
+       read_head_info();
+       if (commands) {
+               const char *unpack_status = NULL;
+
+               if (!delete_only(commands))
+                       unpack_status = unpack();
+               execute_commands(unpack_status);
+               if (pack_lockfile)
+                       unlink(pack_lockfile);
+               if (report_status)
+                       report(unpack_status);
+               run_hook(post_receive_hook);
+               run_update_post_hook(commands);
+       }
+       return 0;
+}

diff --git a/builtin.h b/builtin.h
index e67cb2090e8c111be4b137939953f3e006f31dfd..5d7cdca70c011b817b824ef77c5da71b2b80c64a 100644 (file)
--- a/builtin.h
+++ b/builtin.h
@@ -78,6 +78,7 @@ extern int cmd_prune(int argc, const char **argv, const char *prefix);
 extern int cmd_prune_packed(int argc, const char **argv, const char *prefix);
 extern int cmd_push(int argc, const char **argv, const char *prefix);
 extern int cmd_read_tree(int argc, const char **argv, const char *prefix);
+extern int cmd_receive_pack(int argc, const char **argv, const char *prefix);
 extern int cmd_reflog(int argc, const char **argv, const char *prefix);
 extern int cmd_remote(int argc, const char **argv, const char *prefix);
 extern int cmd_config(int argc, const char **argv, const char *prefix);

diff --git a/git.c b/git.c
index adf73524098bdb308dea17b651536517a1588fef..2f5b4d72ee249821f88617a4d5a8bbf3a0204340 100644 (file)
--- a/git.c
+++ b/git.c
@@ -328,6 +328,7 @@ static void handle_internal_command(int argc, const char **argv)
                { "prune-packed", cmd_prune_packed, RUN_SETUP },
                { "push", cmd_push, RUN_SETUP },
                { "read-tree", cmd_read_tree, RUN_SETUP },
+               { "receive-pack", cmd_receive_pack },
                { "reflog", cmd_reflog, RUN_SETUP },
                { "remote", cmd_remote, RUN_SETUP },
                { "repo-config", cmd_config },

diff --git a/receive-pack.c b/receive-pack.c
deleted file mode 100644 (file)
index b81678a..0000000
--- a/receive-pack.c
+++ /dev/null
@@ -1,520 +0,0 @@
-#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"
-
-static const char receive_pack_usage[] = "git-receive-pack <git-dir>";
-
-static int deny_non_fast_forwards = 0;
-static int receive_fsck_objects;
-static int receive_unpack_limit = -1;
-static int transfer_unpack_limit = -1;
-static int unpack_limit = 100;
-static int report_status;
-
-static char capabilities[] = " report-status delete-refs ";
-static int capabilities_sent;
-
-static int receive_pack_config(const char *var, const char *value, void *cb)
-{
-       if (strcmp(var, "receive.denynonfastforwards") == 0) {
-               deny_non_fast_forwards = git_config_bool(var, value);
-               return 0;
-       }
-
-       if (strcmp(var, "receive.unpacklimit") == 0) {
-               receive_unpack_limit = git_config_int(var, value);
-               return 0;
-       }
-
-       if (strcmp(var, "transfer.unpacklimit") == 0) {
-               transfer_unpack_limit = git_config_int(var, value);
-               return 0;
-       }
-
-       if (strcmp(var, "receive.fsckobjects") == 0) {
-               receive_fsck_objects = git_config_bool(var, value);
-               return 0;
-       }
-
-       return git_default_config(var, value, cb);
-}
-
-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);
-       else
-               packet_write(1, "%s %s%c%s\n",
-                            sha1_to_hex(sha1), path, 0, capabilities);
-       capabilities_sent = 1;
-       return 0;
-}
-
-static void write_head_info(void)
-{
-       for_each_ref(show_ref, NULL);
-       if (!capabilities_sent)
-               show_ref("capabilities^{}", null_sha1, 0, NULL);
-
-}
-
-struct command {
-       struct command *next;
-       const char *error_string;
-       unsigned char old_sha1[20];
-       unsigned char new_sha1[20];
-       char ref_name[FLEX_ARRAY]; /* more */
-};
-
-static struct command *commands;
-
-static const char pre_receive_hook[] = "hooks/pre-receive";
-static const char post_receive_hook[] = "hooks/post-receive";
-
-static int hook_status(int code, const char *hook_name)
-{
-       switch (code) {
-       case 0:
-               return 0;
-       case -ERR_RUN_COMMAND_FORK:
-               return error("hook fork failed");
-       case -ERR_RUN_COMMAND_EXEC:
-               return error("hook execute failed");
-       case -ERR_RUN_COMMAND_PIPE:
-               return error("hook pipe failed");
-       case -ERR_RUN_COMMAND_WAITPID:
-               return error("waitpid failed");
-       case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
-               return error("waitpid is confused");
-       case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
-               return error("%s died of signal", hook_name);
-       case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
-               return error("%s died strangely", hook_name);
-       default:
-               error("%s exited with error code %d", hook_name, -code);
-               return -code;
-       }
-}
-
-static int run_hook(const char *hook_name)
-{
-       static char buf[sizeof(commands->old_sha1) * 2 + PATH_MAX + 4];
-       struct command *cmd;
-       struct child_process proc;
-       const char *argv[2];
-       int have_input = 0, code;
-
-       for (cmd = commands; !have_input && cmd; cmd = cmd->next) {
-               if (!cmd->error_string)
-                       have_input = 1;
-       }
-
-       if (!have_input || access(hook_name, X_OK) < 0)
-               return 0;
-
-       argv[0] = hook_name;
-       argv[1] = NULL;
-
-       memset(&proc, 0, sizeof(proc));
-       proc.argv = argv;
-       proc.in = -1;
-       proc.stdout_to_stderr = 1;
-
-       code = start_command(&proc);
-       if (code)
-               return hook_status(code, hook_name);
-       for (cmd = commands; cmd; cmd = cmd->next) {
-               if (!cmd->error_string) {
-                       size_t n = snprintf(buf, sizeof(buf), "%s %s %s\n",
-                               sha1_to_hex(cmd->old_sha1),
-                               sha1_to_hex(cmd->new_sha1),
-                               cmd->ref_name);
-                       if (write_in_full(proc.in, buf, n) != n)
-                               break;
-               }
-       }
-       close(proc.in);
-       return hook_status(finish_command(&proc), hook_name);
-}
-
-static int run_update_hook(struct command *cmd)
-{
-       static const char update_hook[] = "hooks/update";
-       struct child_process proc;
-       const char *argv[5];
-
-       if (access(update_hook, X_OK) < 0)
-               return 0;
-
-       argv[0] = update_hook;
-       argv[1] = cmd->ref_name;
-       argv[2] = sha1_to_hex(cmd->old_sha1);
-       argv[3] = sha1_to_hex(cmd->new_sha1);
-       argv[4] = NULL;
-
-       memset(&proc, 0, sizeof(proc));
-       proc.argv = argv;
-       proc.no_stdin = 1;
-       proc.stdout_to_stderr = 1;
-
-       return hook_status(run_command(&proc), update_hook);
-}
-
-static const char *update(struct command *cmd)
-{
-       const char *name = cmd->ref_name;
-       unsigned char *old_sha1 = cmd->old_sha1;
-       unsigned char *new_sha1 = cmd->new_sha1;
-       struct ref_lock *lock;
-
-       /* only refs/... are allowed */
-       if (prefixcmp(name, "refs/") || check_ref_format(name + 5)) {
-               error("refusing to create funny ref '%s' remotely", name);
-               return "funny refname";
-       }
-
-       if (!is_null_sha1(new_sha1) && !has_sha1_file(new_sha1)) {
-               error("unpack should have generated %s, "
-                     "but I can't find it!", sha1_to_hex(new_sha1));
-               return "bad pack";
-       }
-       if (deny_non_fast_forwards && !is_null_sha1(new_sha1) &&
-           !is_null_sha1(old_sha1) &&
-           !prefixcmp(name, "refs/heads/")) {
-               struct object *old_object, *new_object;
-               struct commit *old_commit, *new_commit;
-               struct commit_list *bases, *ent;
-
-               old_object = parse_object(old_sha1);
-               new_object = parse_object(new_sha1);
-
-               if (!old_object || !new_object ||
-                   old_object->type != OBJ_COMMIT ||
-                   new_object->type != OBJ_COMMIT) {
-                       error("bad sha1 objects for %s", name);
-                       return "bad ref";
-               }
-               old_commit = (struct commit *)old_object;
-               new_commit = (struct commit *)new_object;
-               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) {
-                       error("denying non-fast forward %s"
-                             " (you should pull first)", name);
-                       return "non-fast forward";
-               }
-       }
-       if (run_update_hook(cmd)) {
-               error("hook declined to update %s", name);
-               return "hook declined";
-       }
-
-       if (is_null_sha1(new_sha1)) {
-               if (!parse_object(old_sha1)) {
-                       warning ("Allowing deletion of corrupt ref.");
-                       old_sha1 = NULL;
-               }
-               if (delete_ref(name, old_sha1)) {
-                       error("failed to delete %s", name);
-                       return "failed to delete";
-               }
-               return NULL; /* good */
-       }
-       else {
-               lock = lock_any_ref_for_update(name, old_sha1, 0);
-               if (!lock) {
-                       error("failed to lock %s", name);
-                       return "failed to lock";
-               }
-               if (write_ref_sha1(lock, new_sha1, "push")) {
-                       return "failed to write"; /* error() already called */
-               }
-               return NULL; /* good */
-       }
-}
-
-static char update_post_hook[] = "hooks/post-update";
-
-static void run_update_post_hook(struct command *cmd)
-{
-       struct command *cmd_p;
-       int argc;
-       const char **argv;
-
-       for (argc = 0, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
-               if (cmd_p->error_string)
-                       continue;
-               argc++;
-       }
-       if (!argc || access(update_post_hook, X_OK) < 0)
-               return;
-       argv = xmalloc(sizeof(*argv) * (2 + argc));
-       argv[0] = update_post_hook;
-
-       for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
-               char *p;
-               if (cmd_p->error_string)
-                       continue;
-               p = xmalloc(strlen(cmd_p->ref_name) + 1);
-               strcpy(p, cmd_p->ref_name);
-               argv[argc] = p;
-               argc++;
-       }
-       argv[argc] = NULL;
-       run_command_v_opt(argv, RUN_COMMAND_NO_STDIN
-               | RUN_COMMAND_STDOUT_TO_STDERR);
-}
-
-static void execute_commands(const char *unpacker_error)
-{
-       struct command *cmd = commands;
-
-       if (unpacker_error) {
-               while (cmd) {
-                       cmd->error_string = "n/a (unpacker error)";
-                       cmd = cmd->next;
-               }
-               return;
-       }
-
-       if (run_hook(pre_receive_hook)) {
-               while (cmd) {
-                       cmd->error_string = "pre-receive hook declined";
-                       cmd = cmd->next;
-               }
-               return;
-       }
-
-       while (cmd) {
-               cmd->error_string = update(cmd);
-               cmd = cmd->next;
-       }
-}
-
-static void read_head_info(void)
-{
-       struct command **p = &commands;
-       for (;;) {
-               static char line[1000];
-               unsigned char old_sha1[20], new_sha1[20];
-               struct command *cmd;
-               char *refname;
-               int len, reflen;
-
-               len = packet_read_line(0, line, sizeof(line));
-               if (!len)
-                       break;
-               if (line[len-1] == '\n')
-                       line[--len] = 0;
-               if (len < 83 ||
-                   line[40] != ' ' ||
-                   line[81] != ' ' ||
-                   get_sha1_hex(line, old_sha1) ||
-                   get_sha1_hex(line + 41, new_sha1))
-                       die("protocol error: expected old/new/ref, got '%s'",
-                           line);
-
-               refname = line + 82;
-               reflen = strlen(refname);
-               if (reflen + 82 < len) {
-                       if (strstr(refname + reflen + 1, "report-status"))
-                               report_status = 1;
-               }
-               cmd = xmalloc(sizeof(struct command) + len - 80);
-               hashcpy(cmd->old_sha1, old_sha1);
-               hashcpy(cmd->new_sha1, new_sha1);
-               memcpy(cmd->ref_name, line + 82, len - 81);
-               cmd->error_string = NULL;
-               cmd->next = NULL;
-               *p = cmd;
-               p = &cmd->next;
-       }
-}
-
-static const char *parse_pack_header(struct pack_header *hdr)
-{
-       switch (read_pack_header(0, hdr)) {
-       case PH_ERROR_EOF:
-               return "eof before pack header was fully read";
-
-       case PH_ERROR_PACK_SIGNATURE:
-               return "protocol error (pack signature mismatch detected)";
-
-       case PH_ERROR_PROTOCOL:
-               return "protocol error (pack version unsupported)";
-
-       default:
-               return "unknown error in parse_pack_header";
-
-       case 0:
-               return NULL;
-       }
-}
-
-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=%"PRIu32",%"PRIu32,
-                       ntohl(hdr.hdr_version), ntohl(hdr.hdr_entries));
-
-       if (ntohl(hdr.hdr_entries) < unpack_limit) {
-               int code, i = 0;
-               const char *unpacker[4];
-               unpacker[i++] = "unpack-objects";
-               if (receive_fsck_objects)
-                       unpacker[i++] = "--strict";
-               unpacker[i++] = hdr_arg;
-               unpacker[i++] = NULL;
-               code = run_command_v_opt(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[7];
-               int s, status, i = 0;
-               char keep_arg[256];
-               struct child_process ip;
-
-               s = sprintf(keep_arg, "--keep=receive-pack %"PRIuMAX" on ", (uintmax_t) getpid());
-               if (gethostname(keep_arg + s, sizeof(keep_arg) - s))
-                       strcpy(keep_arg + s, "localhost");
-
-               keeper[i++] = "index-pack";
-               keeper[i++] = "--stdin";
-               if (receive_fsck_objects)
-                       keeper[i++] = "--strict";
-               keeper[i++] = "--fix-thin";
-               keeper[i++] = hdr_arg;
-               keeper[i++] = keep_arg;
-               keeper[i++] = NULL;
-               memset(&ip, 0, sizeof(ip));
-               ip.argv = keeper;
-               ip.out = -1;
-               ip.git_cmd = 1;
-               if (start_command(&ip))
-                       return "index-pack fork failed";
-               pack_lockfile = index_pack_lockfile(ip.out);
-               close(ip.out);
-               status = finish_command(&ip);
-               if (!status) {
-                       reprepare_packed_git();
-                       return NULL;
-               }
-               return "index-pack abnormal exit";
-       }
-}
-
-static void report(const char *unpack_status)
-{
-       struct command *cmd;
-       packet_write(1, "unpack %s\n",
-                    unpack_status ? unpack_status : "ok");
-       for (cmd = commands; cmd; cmd = cmd->next) {
-               if (!cmd->error_string)
-                       packet_write(1, "ok %s\n",
-                                    cmd->ref_name);
-               else
-                       packet_write(1, "ng %s %s\n",
-                                    cmd->ref_name, cmd->error_string);
-       }
-       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;
-       char *dir = NULL;
-
-       argv++;
-       for (i = 1; i < argc; i++) {
-               char *arg = *argv++;
-
-               if (*arg == '-') {
-                       /* Do flag handling here */
-                       usage(receive_pack_usage);
-               }
-               if (dir)
-                       usage(receive_pack_usage);
-               dir = arg;
-       }
-       if (!dir)
-               usage(receive_pack_usage);
-
-       setup_path();
-
-       if (!enter_repo(dir, 0))
-               die("'%s': unable to chdir or not a git archive", dir);
-
-       if (is_repository_shallow())
-               die("attempt to push into a shallow repository");
-
-       git_config(receive_pack_config, NULL);
-
-       if (0 <= transfer_unpack_limit)
-               unpack_limit = transfer_unpack_limit;
-       else if (0 <= receive_unpack_limit)
-               unpack_limit = receive_unpack_limit;
-
-       write_head_info();
-
-       /* EOF */
-       packet_flush(1);
-
-       read_head_info();
-       if (commands) {
-               const char *unpack_status = NULL;
-
-               if (!delete_only(commands))
-                       unpack_status = unpack();
-               execute_commands(unpack_status);
-               if (pack_lockfile)
-                       unlink(pack_lockfile);
-               if (report_status)
-                       report(unpack_status);
-               run_hook(post_receive_hook);
-               run_update_post_hook(commands);
-       }
-       return 0;
-}