diff options
Diffstat (limited to 'receive-pack.c')
| -rw-r--r-- | receive-pack.c | 340 |
1 files changed, 340 insertions, 0 deletions
diff --git a/receive-pack.c b/receive-pack.c new file mode 100644 index 0000000000..93929b5371 --- /dev/null +++ b/receive-pack.c @@ -0,0 +1,340 @@ +#include "cache.h" +#include "refs.h" +#include "pkt-line.h" +#include "run-command.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 report_status = 0; + +static char capabilities[] = "report-status"; +static int capabilities_sent = 0; + +static int show_ref(const char *path, const unsigned char *sha1) +{ + 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); + if (!capabilities_sent) + show_ref("capabilities^{}", null_sha1); + +} + +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 = NULL; + +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, + char *old_hex, char *new_hex) +{ + int code; + + if (access(update_hook, X_OK) < 0) + return 0; + code = run_command(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[60], *old_hex, *lock_name; + int newfd, namelen, written; + + 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); + } + + 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)) { + 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 (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); + } + else { + 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(argc, argv, RUN_COMMAND_NO_STDIO); +} + +/* + * 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); + memcpy(cmd->old_sha1, old_sha1, 20); + memcpy(cmd->new_sha1, new_sha1, 20); + 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 *unpack(int *error_code) +{ + int code = run_command_v_opt(1, unpacker, RUN_GIT_CMD); + + *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 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); +} + +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); + + write_head_info(); + + /* EOF */ + packet_flush(1); + + read_head_info(); + if (commands) { + int code; + const char *unpack_status = unpack(&code); + if (!unpack_status) + execute_commands(); + if (report_status) + report(unpack_status); + } + return 0; +} |