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-rw-r--r--receive-pack.c458
1 files changed, 458 insertions, 0 deletions
diff --git a/receive-pack.c b/receive-pack.c
new file mode 100644
index 0000000000..7311c822dd
--- /dev/null
+++ b/receive-pack.c
@@ -0,0 +1,458 @@
+#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_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)
+{
+ 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;
+ }
+
+ return git_default_config(var, value);
+}
+
+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 char update_hook[] = "hooks/update";
+
+static int run_update_hook(const char *refname,
+ char *old_hex, char *new_hex)
+{
+ int code;
+
+ if (access(update_hook, X_OK) < 0)
+ return 0;
+ code = run_command_opt(RUN_COMMAND_NO_STDIN
+ | RUN_COMMAND_STDOUT_TO_STDERR,
+ update_hook, refname, old_hex, new_hex, NULL);
+ 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_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", update_hook);
+ case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
+ return error("%s died strangely", update_hook);
+ default:
+ error("%s exited with error code %d", update_hook, -code);
+ return -code;
+ }
+}
+
+static int update(struct command *cmd)
+{
+ const char *name = cmd->ref_name;
+ unsigned char *old_sha1 = cmd->old_sha1;
+ unsigned char *new_sha1 = cmd->new_sha1;
+ 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)) {
+ cmd->error_string = "funny refname";
+ return error("refusing to create funny ref '%s' locally",
+ name);
+ }
+
+ strcpy(new_hex, sha1_to_hex(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);
+ }
+ 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)) {
+ cmd->error_string = "hook declined";
+ return error("hook declined to update %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;
+}
+
+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;
+
+ if (access(update_post_hook, X_OK) < 0)
+ return;
+ for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
+ if (cmd_p->error_string)
+ continue;
+ argc++;
+ }
+ argv = xmalloc(sizeof(*argv) * (1 + 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);
+}
+
+/*
+ * This gets called after(if) we've successfully
+ * unpacked the data payload.
+ */
+static void execute_commands(void)
+{
+ struct command *cmd = commands;
+
+ while (cmd) {
+ update(cmd);
+ cmd = cmd->next;
+ }
+ run_update_post_hook(commands);
+}
+
+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 = "n/a (unpacker error)";
+ 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=%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(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";
+ }
+}
+
+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);
+
+ 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);
+
+ 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();
+ if (!unpack_status)
+ execute_commands();
+ if (pack_lockfile)
+ unlink(pack_lockfile);
+ if (report_status)
+ report(unpack_status);
+ }
+ return 0;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-20 14:05:07 +0000