Merge branch 'ns/send-email-no-chain-reply-to'
[gitweb.git] / builtin-receive-pack.c
index db67c3162c6b8ffaba793fd6082324aeae158f86..78c0e69cdc9fe2d21e83947932cb353c0553452e 100644 (file)
@@ -9,25 +9,29 @@
 #include "remote.h"
 #include "transport.h"
 
-static const char receive_pack_usage[] = "git-receive-pack <git-dir>";
+static const char receive_pack_usage[] = "git receive-pack <git-dir>";
 
 enum deny_action {
+       DENY_UNCONFIGURED,
        DENY_IGNORE,
        DENY_WARN,
        DENY_REFUSE,
 };
 
-static int deny_deletes = 0;
-static int deny_non_fast_forwards = 0;
-static enum deny_action deny_current_branch = DENY_WARN;
+static int deny_deletes;
+static int deny_non_fast_forwards;
+static enum deny_action deny_current_branch = DENY_UNCONFIGURED;
+static enum deny_action deny_delete_current = DENY_UNCONFIGURED;
 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 prefer_ofs_delta = 1;
+static int auto_update_server_info;
+static int auto_gc = 1;
+static const char *head_name;
+static char *capabilities_to_send;
 
 static enum deny_action parse_deny_action(const char *var, const char *value)
 {
@@ -76,24 +80,44 @@ static int receive_pack_config(const char *var, const char *value, void *cb)
                return 0;
        }
 
+       if (strcmp(var, "receive.denydeletecurrent") == 0) {
+               deny_delete_current = parse_deny_action(var, value);
+               return 0;
+       }
+
+       if (strcmp(var, "repack.usedeltabaseoffset") == 0) {
+               prefer_ofs_delta = git_config_bool(var, value);
+               return 0;
+       }
+
+       if (strcmp(var, "receive.updateserverinfo") == 0) {
+               auto_update_server_info = git_config_bool(var, value);
+               return 0;
+       }
+
+       if (strcmp(var, "receive.autogc") == 0) {
+               auto_gc = 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)
+       if (!capabilities_to_send)
                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;
+                            sha1_to_hex(sha1), path, 0, capabilities_to_send);
+       capabilities_to_send = NULL;
        return 0;
 }
 
 static void write_head_info(void)
 {
        for_each_ref(show_ref, NULL);
-       if (!capabilities_sent)
+       if (capabilities_to_send)
                show_ref("capabilities^{}", null_sha1, 0, NULL);
 
 }
@@ -111,32 +135,7 @@ 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 int run_receive_hook(const char *hook_name)
 {
        static char buf[sizeof(commands->old_sha1) * 2 + PATH_MAX + 4];
        struct command *cmd;
@@ -162,7 +161,7 @@ static int run_hook(const char *hook_name)
 
        code = start_command(&proc);
        if (code)
-               return hook_status(code, hook_name);
+               return code;
        for (cmd = commands; cmd; cmd = cmd->next) {
                if (!cmd->error_string) {
                        size_t n = snprintf(buf, sizeof(buf), "%s %s %s\n",
@@ -174,13 +173,12 @@ static int run_hook(const char *hook_name)
                }
        }
        close(proc.in);
-       return hook_status(finish_command(&proc), hook_name);
+       return finish_command(&proc);
 }
 
 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)
@@ -192,26 +190,73 @@ static int run_update_hook(struct command *cmd)
        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);
+       return run_command_v_opt(argv, RUN_COMMAND_NO_STDIN |
+                                       RUN_COMMAND_STDOUT_TO_STDERR);
 }
 
 static int is_ref_checked_out(const char *ref)
 {
-       unsigned char sha1[20];
-       const char *head;
-
        if (is_bare_repository())
                return 0;
 
-       head = resolve_ref("HEAD", sha1, 0, NULL);
-       if (!head)
+       if (!head_name)
                return 0;
-       return !strcmp(head, ref);
+       return !strcmp(head_name, ref);
+}
+
+static char *warn_unconfigured_deny_msg[] = {
+       "Updating the currently checked out branch may cause confusion,",
+       "as the index and work tree do not reflect changes that are in HEAD.",
+       "As a result, you may see the changes you just pushed into it",
+       "reverted when you run 'git diff' over there, and you may want",
+       "to run 'git reset --hard' before starting to work to recover.",
+       "",
+       "You can set 'receive.denyCurrentBranch' configuration variable to",
+       "'refuse' in the remote repository to forbid pushing into its",
+       "current branch."
+       "",
+       "To allow pushing into the current branch, you can set it to 'ignore';",
+       "but this is not recommended unless you arranged to update its work",
+       "tree to match what you pushed in some other way.",
+       "",
+       "To squelch this message, you can set it to 'warn'.",
+       "",
+       "Note that the default will change in a future version of git",
+       "to refuse updating the current branch unless you have the",
+       "configuration variable set to either 'ignore' or 'warn'."
+};
+
+static void warn_unconfigured_deny(void)
+{
+       int i;
+       for (i = 0; i < ARRAY_SIZE(warn_unconfigured_deny_msg); i++)
+               warning("%s", warn_unconfigured_deny_msg[i]);
+}
+
+static char *warn_unconfigured_deny_delete_current_msg[] = {
+       "Deleting the current branch can cause confusion by making the next",
+       "'git clone' not check out any file.",
+       "",
+       "You can set 'receive.denyDeleteCurrent' configuration variable to",
+       "'refuse' in the remote repository to disallow deleting the current",
+       "branch.",
+       "",
+       "You can set it to 'ignore' to allow such a delete without a warning.",
+       "",
+       "To make this warning message less loud, you can set it to 'warn'.",
+       "",
+       "Note that the default will change in a future version of git",
+       "to refuse deleting the current branch unless you have the",
+       "configuration variable set to either 'ignore' or 'warn'."
+};
+
+static void warn_unconfigured_deny_delete_current(void)
+{
+       int i;
+       for (i = 0;
+            i < ARRAY_SIZE(warn_unconfigured_deny_delete_current_msg);
+            i++)
+               warning("%s", warn_unconfigured_deny_delete_current_msg[i]);
 }
 
 static const char *update(struct command *cmd)
@@ -227,22 +272,20 @@ static const char *update(struct command *cmd)
                return "funny refname";
        }
 
-       switch (deny_current_branch) {
-       case DENY_IGNORE:
-               break;
-       case DENY_WARN:
-               if (!is_ref_checked_out(name))
+       if (is_ref_checked_out(name)) {
+               switch (deny_current_branch) {
+               case DENY_IGNORE:
                        break;
-               warning("updating the currently checked out branch; this may"
-                       " cause confusion,\n"
-                       "as the index and working tree do not reflect changes"
-                       " that are now in HEAD.");
-               break;
-       case DENY_REFUSE:
-               if (!is_ref_checked_out(name))
+               case DENY_UNCONFIGURED:
+               case DENY_WARN:
+                       warning("updating the current branch");
+                       if (deny_current_branch == DENY_UNCONFIGURED)
+                               warn_unconfigured_deny();
                        break;
-               error("refusing to update checked out branch: %s", name);
-               return "branch is currently checked out";
+               case DENY_REFUSE:
+                       error("refusing to update checked out branch: %s", name);
+                       return "branch is currently checked out";
+               }
        }
 
        if (!is_null_sha1(new_sha1) && !has_sha1_file(new_sha1)) {
@@ -250,12 +293,30 @@ static const char *update(struct command *cmd)
                      "but I can't find it!", sha1_to_hex(new_sha1));
                return "bad pack";
        }
-       if (deny_deletes && is_null_sha1(new_sha1) &&
-           !is_null_sha1(old_sha1) &&
-           !prefixcmp(name, "refs/heads/")) {
-               error("denying ref deletion for %s", name);
-               return "deletion prohibited";
+
+       if (!is_null_sha1(old_sha1) && is_null_sha1(new_sha1)) {
+               if (deny_deletes && !prefixcmp(name, "refs/heads/")) {
+                       error("denying ref deletion for %s", name);
+                       return "deletion prohibited";
+               }
+
+               if (!strcmp(name, head_name)) {
+                       switch (deny_delete_current) {
+                       case DENY_IGNORE:
+                               break;
+                       case DENY_WARN:
+                       case DENY_UNCONFIGURED:
+                               if (deny_delete_current == DENY_UNCONFIGURED)
+                                       warn_unconfigured_deny_delete_current();
+                               warning("deleting the current branch");
+                               break;
+                       case DENY_REFUSE:
+                               error("refusing to delete the current branch: %s", name);
+                               return "deletion of the current branch prohibited";
+                       }
+               }
        }
+
        if (deny_non_fast_forwards && !is_null_sha1(new_sha1) &&
            !is_null_sha1(old_sha1) &&
            !prefixcmp(name, "refs/heads/")) {
@@ -280,9 +341,9 @@ static const char *update(struct command *cmd)
                                break;
                free_commit_list(bases);
                if (!ent) {
-                       error("denying non-fast forward %s"
+                       error("denying non-fast-forward %s"
                              " (you should pull first)", name);
-                       return "non-fast forward";
+                       return "non-fast-forward";
                }
        }
        if (run_update_hook(cmd)) {
@@ -319,7 +380,7 @@ static char update_post_hook[] = "hooks/post-update";
 static void run_update_post_hook(struct command *cmd)
 {
        struct command *cmd_p;
-       int argc;
+       int argc, status;
        const char **argv;
 
        for (argc = 0, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
@@ -342,13 +403,14 @@ static void run_update_post_hook(struct command *cmd)
                argc++;
        }
        argv[argc] = NULL;
-       run_command_v_opt(argv, RUN_COMMAND_NO_STDIN
-               | RUN_COMMAND_STDOUT_TO_STDERR);
+       status = 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;
+       unsigned char sha1[20];
 
        if (unpacker_error) {
                while (cmd) {
@@ -358,7 +420,7 @@ static void execute_commands(const char *unpacker_error)
                return;
        }
 
-       if (run_hook(pre_receive_hook)) {
+       if (run_receive_hook(pre_receive_hook)) {
                while (cmd) {
                        cmd->error_string = "pre-receive hook declined";
                        cmd = cmd->next;
@@ -366,6 +428,8 @@ static void execute_commands(const char *unpacker_error)
                return;
        }
 
+       head_name = resolve_ref("HEAD", sha1, 0, NULL);
+
        while (cmd) {
                cmd->error_string = update(cmd);
                cmd = cmd->next;
@@ -456,24 +520,9 @@ static const char *unpack(void)
                unpacker[i++] = hdr_arg;
                unpacker[i++] = NULL;
                code = run_command_v_opt(unpacker, RUN_GIT_CMD);
-               switch (code) {
-               case 0:
+               if (!code)
                        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";
-               }
+               return "unpack-objects abnormal exit";
        } else {
                const char *keeper[7];
                int s, status, i = 0;
@@ -496,8 +545,10 @@ static const char *unpack(void)
                ip.argv = keeper;
                ip.out = -1;
                ip.git_cmd = 1;
-               if (start_command(&ip))
+               status = start_command(&ip);
+               if (status) {
                        return "index-pack fork failed";
+               }
                pack_lockfile = index_pack_lockfile(ip.out);
                close(ip.out);
                status = finish_command(&ip);
@@ -576,6 +627,8 @@ static void add_alternate_refs(void)
 
 int cmd_receive_pack(int argc, const char **argv, const char *prefix)
 {
+       int advertise_refs = 0;
+       int stateless_rpc = 0;
        int i;
        char *dir = NULL;
 
@@ -584,7 +637,15 @@ int cmd_receive_pack(int argc, const char **argv, const char *prefix)
                const char *arg = *argv++;
 
                if (*arg == '-') {
-                       /* Do flag handling here */
+                       if (!strcmp(arg, "--advertise-refs")) {
+                               advertise_refs = 1;
+                               continue;
+                       }
+                       if (!strcmp(arg, "--stateless-rpc")) {
+                               stateless_rpc = 1;
+                               continue;
+                       }
+
                        usage(receive_pack_usage);
                }
                if (dir)
@@ -597,7 +658,7 @@ int cmd_receive_pack(int argc, const char **argv, const char *prefix)
        setup_path();
 
        if (!enter_repo(dir, 0))
-               die("'%s': unable to chdir or not a git archive", dir);
+               die("'%s' does not appear to be a git repository", dir);
 
        if (is_repository_shallow())
                die("attempt to push into a shallow repository");
@@ -609,12 +670,20 @@ int cmd_receive_pack(int argc, const char **argv, const char *prefix)
        else if (0 <= receive_unpack_limit)
                unpack_limit = receive_unpack_limit;
 
-       add_alternate_refs();
-       write_head_info();
-       clear_extra_refs();
+       capabilities_to_send = (prefer_ofs_delta) ?
+               " report-status delete-refs ofs-delta " :
+               " report-status delete-refs ";
 
-       /* EOF */
-       packet_flush(1);
+       if (advertise_refs || !stateless_rpc) {
+               add_alternate_refs();
+               write_head_info();
+               clear_extra_refs();
+
+               /* EOF */
+               packet_flush(1);
+       }
+       if (advertise_refs)
+               return 0;
 
        read_head_info();
        if (commands) {
@@ -624,11 +693,19 @@ int cmd_receive_pack(int argc, const char **argv, const char *prefix)
                        unpack_status = unpack();
                execute_commands(unpack_status);
                if (pack_lockfile)
-                       unlink(pack_lockfile);
+                       unlink_or_warn(pack_lockfile);
                if (report_status)
                        report(unpack_status);
-               run_hook(post_receive_hook);
+               run_receive_hook(post_receive_hook);
                run_update_post_hook(commands);
+               if (auto_gc) {
+                       const char *argv_gc_auto[] = {
+                               "gc", "--auto", "--quiet", NULL,
+                       };
+                       run_command_v_opt(argv_gc_auto, RUN_GIT_CMD);
+               }
+               if (auto_update_server_info)
+                       update_server_info(0);
        }
        return 0;
 }