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https://github.com/git/git
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![Junio C Hamano](/assets/img/avatar_default.png)
Using git-check-ref-format, make sure we do not create refs with funny names when cloning from elsewhere (clone-pack), fast forwarding local heads (git-fetch), or somebody pushes into us (receive-pack). Signed-off-by: Junio C Hamano <junkio@cox.net>
292 lines
6.4 KiB
C
292 lines
6.4 KiB
C
#include "cache.h"
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#include "refs.h"
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#include "pkt-line.h"
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#include "run-command.h"
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#include <sys/wait.h>
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static const char receive_pack_usage[] = "git-receive-pack <git-dir>";
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static const char unpacker[] = "git-unpack-objects";
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static int show_ref(const char *path, const unsigned char *sha1)
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{
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packet_write(1, "%s %s\n", sha1_to_hex(sha1), path);
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return 0;
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}
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static void write_head_info(void)
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{
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for_each_ref(show_ref);
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}
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struct command {
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struct command *next;
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unsigned char updated;
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unsigned char old_sha1[20];
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unsigned char new_sha1[20];
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char ref_name[0];
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};
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static struct command *commands = NULL;
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static int is_all_zeroes(const char *hex)
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{
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int i;
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for (i = 0; i < 40; i++)
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if (*hex++ != '0')
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return 0;
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return 1;
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}
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static int verify_old_ref(const char *name, char *hex_contents)
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{
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int fd, ret;
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char buffer[60];
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if (is_all_zeroes(hex_contents))
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return 0;
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fd = open(name, O_RDONLY);
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if (fd < 0)
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return -1;
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ret = read(fd, buffer, 40);
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close(fd);
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if (ret != 40)
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return -1;
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if (memcmp(buffer, hex_contents, 40))
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return -1;
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return 0;
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}
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static char update_hook[] = "hooks/update";
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static int run_update_hook(const char *refname,
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char *old_hex, char *new_hex)
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{
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int code;
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if (access(update_hook, X_OK) < 0)
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return 0;
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code = run_command(update_hook, refname, old_hex, new_hex, NULL);
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switch (code) {
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case 0:
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return 0;
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case -ERR_RUN_COMMAND_FORK:
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die("hook fork failed");
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case -ERR_RUN_COMMAND_EXEC:
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die("hook execute failed");
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case -ERR_RUN_COMMAND_WAITPID:
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die("waitpid failed");
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case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
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die("waitpid is confused");
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case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
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fprintf(stderr, "%s died of signal", update_hook);
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return -1;
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case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
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die("%s died strangely", update_hook);
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default:
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error("%s exited with error code %d", update_hook, -code);
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return -code;
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}
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}
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static int update(const char *name,
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unsigned char *old_sha1, unsigned char *new_sha1)
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{
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char new_hex[60], *old_hex, *lock_name;
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int newfd, namelen, written;
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if (!strncmp(name, "refs/", 5) && check_ref_format(name + 5))
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return error("refusing to create funny ref '%s' locally",
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name);
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namelen = strlen(name);
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lock_name = xmalloc(namelen + 10);
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memcpy(lock_name, name, namelen);
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memcpy(lock_name + namelen, ".lock", 6);
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strcpy(new_hex, sha1_to_hex(new_sha1));
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old_hex = sha1_to_hex(old_sha1);
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if (!has_sha1_file(new_sha1))
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return error("unpack should have generated %s, "
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"but I can't find it!", new_hex);
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safe_create_leading_directories(lock_name);
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newfd = open(lock_name, O_CREAT | O_EXCL | O_WRONLY, 0666);
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if (newfd < 0)
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return error("unable to create %s (%s)",
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lock_name, strerror(errno));
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/* Write the ref with an ending '\n' */
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new_hex[40] = '\n';
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new_hex[41] = 0;
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written = write(newfd, new_hex, 41);
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/* Remove the '\n' again */
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new_hex[40] = 0;
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close(newfd);
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if (written != 41) {
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unlink(lock_name);
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return error("unable to write %s", lock_name);
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}
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if (verify_old_ref(name, old_hex) < 0) {
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unlink(lock_name);
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return error("%s changed during push", name);
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}
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if (run_update_hook(name, old_hex, new_hex)) {
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unlink(lock_name);
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return error("hook declined to update %s\n", name);
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}
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else if (rename(lock_name, name) < 0) {
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unlink(lock_name);
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return error("unable to replace %s", name);
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}
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else {
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fprintf(stderr, "%s: %s -> %s\n", name, old_hex, new_hex);
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return 0;
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}
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}
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static char update_post_hook[] = "hooks/post-update";
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static void run_update_post_hook(struct command *cmd)
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{
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struct command *cmd_p;
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int argc;
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char **argv;
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if (access(update_post_hook, X_OK) < 0)
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return;
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for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
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if (!cmd_p->updated)
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continue;
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argc++;
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}
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argv = xmalloc(sizeof(*argv) * (1 + argc));
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argv[0] = update_post_hook;
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for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
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if (!cmd_p->updated)
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continue;
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argv[argc] = xmalloc(strlen(cmd_p->ref_name) + 1);
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strcpy(argv[argc], cmd_p->ref_name);
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argc++;
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}
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argv[argc] = NULL;
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run_command_v(argc, argv);
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}
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/*
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* This gets called after(if) we've successfully
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* unpacked the data payload.
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*/
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static void execute_commands(void)
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{
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struct command *cmd = commands;
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while (cmd) {
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cmd->updated = !update(cmd->ref_name,
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cmd->old_sha1, cmd->new_sha1);
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cmd = cmd->next;
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}
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run_update_post_hook(commands);
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}
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static void read_head_info(void)
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{
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struct command **p = &commands;
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for (;;) {
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static char line[1000];
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unsigned char old_sha1[20], new_sha1[20];
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struct command *cmd;
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int len;
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len = packet_read_line(0, line, sizeof(line));
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if (!len)
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break;
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if (line[len-1] == '\n')
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line[--len] = 0;
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if (len < 83 ||
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line[40] != ' ' ||
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line[81] != ' ' ||
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get_sha1_hex(line, old_sha1) ||
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get_sha1_hex(line + 41, new_sha1))
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die("protocol error: expected old/new/ref, got '%s'", line);
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cmd = xmalloc(sizeof(struct command) + len - 80);
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memcpy(cmd->old_sha1, old_sha1, 20);
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memcpy(cmd->new_sha1, new_sha1, 20);
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memcpy(cmd->ref_name, line + 82, len - 81);
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cmd->next = NULL;
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*p = cmd;
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p = &cmd->next;
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}
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}
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static void unpack(void)
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{
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int code = run_command(unpacker, NULL);
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switch (code) {
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case 0:
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return;
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case -ERR_RUN_COMMAND_FORK:
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die("unpack fork failed");
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case -ERR_RUN_COMMAND_EXEC:
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die("unpack execute failed");
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case -ERR_RUN_COMMAND_WAITPID:
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die("waitpid failed");
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case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
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die("waitpid is confused");
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case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
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die("%s died of signal", unpacker);
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case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
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die("%s died strangely", unpacker);
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default:
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die("%s exited with error code %d", unpacker, -code);
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}
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}
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int main(int argc, char **argv)
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{
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int i;
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const char *dir = NULL;
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argv++;
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for (i = 1; i < argc; i++) {
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const char *arg = *argv++;
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if (*arg == '-') {
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/* Do flag handling here */
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usage(receive_pack_usage);
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}
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if (dir)
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usage(receive_pack_usage);
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dir = arg;
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}
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if (!dir)
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usage(receive_pack_usage);
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/* chdir to the directory. If that fails, try appending ".git" */
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if (chdir(dir) < 0) {
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if (chdir(mkpath("%s.git", dir)) < 0)
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die("unable to cd to %s", dir);
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}
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/* If we have a ".git" directory, chdir to it */
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chdir(".git");
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putenv("GIT_DIR=.");
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if (access("objects", X_OK) < 0 || access("refs/heads", X_OK) < 0)
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die("%s doesn't appear to be a git directory", dir);
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write_head_info();
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/* EOF */
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packet_flush(1);
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read_head_info();
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if (commands) {
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unpack();
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execute_commands();
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}
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return 0;
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}
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