diff options
Diffstat (limited to 'receive-pack.c')
| -rw-r--r-- | receive-pack.c | 287 |
1 files changed, 287 insertions, 0 deletions
diff --git a/receive-pack.c b/receive-pack.c new file mode 100644 index 0000000000..9026f1bf82 --- /dev/null +++ b/receive-pack.c @@ -0,0 +1,287 @@ +#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[] = "git-unpack-objects"; + +static int show_ref(const char *path, const unsigned char *sha1) +{ + packet_write(1, "%s %s\n", sha1_to_hex(sha1), path); + return 0; +} + +static void write_head_info(void) +{ + for_each_ref(show_ref); +} + +struct command { + struct command *next; + unsigned char updated; + unsigned char old_sha1[20]; + unsigned char new_sha1[20]; + char ref_name[0]; +}; + +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: + die("hook fork failed"); + case -ERR_RUN_COMMAND_EXEC: + die("hook execute failed"); + case -ERR_RUN_COMMAND_WAITPID: + die("waitpid failed"); + case -ERR_RUN_COMMAND_WAITPID_WRONG_PID: + die("waitpid is confused"); + case -ERR_RUN_COMMAND_WAITPID_SIGNAL: + fprintf(stderr, "%s died of signal", update_hook); + return -1; + case -ERR_RUN_COMMAND_WAITPID_NOEXIT: + die("%s died strangely", update_hook); + default: + error("%s exited with error code %d", update_hook, -code); + return -code; + } +} + +static int update(const char *name, + unsigned char *old_sha1, unsigned char *new_sha1) +{ + char new_hex[60], *old_hex, *lock_name; + int newfd, namelen, written; + + 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)) + 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) + 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); + return error("unable to write %s", lock_name); + } + if (verify_old_ref(name, old_hex) < 0) { + unlink(lock_name); + return error("%s changed during push", name); + } + if (run_update_hook(name, old_hex, new_hex)) { + unlink(lock_name); + return error("hook declined to update %s\n", name); + } + else if (rename(lock_name, name) < 0) { + unlink(lock_name); + 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; + 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->updated) + 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) { + if (!cmd_p->updated) + continue; + argv[argc] = xmalloc(strlen(cmd_p->ref_name) + 1); + strcpy(argv[argc], cmd_p->ref_name); + argc++; + } + argv[argc] = NULL; + run_command_v(argc, argv); +} + +/* + * This gets called after(if) we've successfully + * unpacked the data payload. + */ +static void execute_commands(void) +{ + struct command *cmd = commands; + + while (cmd) { + cmd->updated = !update(cmd->ref_name, + cmd->old_sha1, cmd->new_sha1); + 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; + int len; + + 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); + 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->next = NULL; + *p = cmd; + p = &cmd->next; + } +} + +static void unpack(void) +{ + int code = run_command(unpacker, NULL); + switch (code) { + case 0: + return; + case -ERR_RUN_COMMAND_FORK: + die("unpack fork failed"); + case -ERR_RUN_COMMAND_EXEC: + die("unpack execute failed"); + case -ERR_RUN_COMMAND_WAITPID: + die("waitpid failed"); + case -ERR_RUN_COMMAND_WAITPID_WRONG_PID: + die("waitpid is confused"); + case -ERR_RUN_COMMAND_WAITPID_SIGNAL: + die("%s died of signal", unpacker); + case -ERR_RUN_COMMAND_WAITPID_NOEXIT: + die("%s died strangely", unpacker); + default: + die("%s exited with error code %d", unpacker, -code); + } +} + +int main(int argc, char **argv) +{ + int i; + const 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 = arg; + } + if (!dir) + usage(receive_pack_usage); + + /* chdir to the directory. If that fails, try appending ".git" */ + if (chdir(dir) < 0) { + if (chdir(mkpath("%s.git", dir)) < 0) + die("unable to cd to %s", dir); + } + + /* If we have a ".git" directory, chdir to it */ + chdir(".git"); + setenv("GIT_DIR", ".", 1); + + if (access("objects", X_OK) < 0 || access("refs/heads", X_OK) < 0) + die("%s doesn't appear to be a git directory", dir); + write_head_info(); + + /* EOF */ + packet_flush(1); + + read_head_info(); + if (commands) { + unpack(); + execute_commands(); + } + return 0; +} |