mirror of
https://github.com/git/git
synced 2024-10-30 04:01:21 +00:00
113b94751d
Do the default "try xyz.git xyz fails" thing for the directory we get passed in.
221 lines
4.6 KiB
C
221 lines
4.6 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 <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 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 void update(const char *name, 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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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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die("unpack should have generated %s, but I can't find it!", new_hex);
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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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die("unable to create %s (%s)", 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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die("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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die("%s changed during push", name);
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}
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if (rename(lock_name, name) < 0) {
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unlink(lock_name);
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die("unable to replace %s", name);
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}
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fprintf(stderr, "%s: %s -> %s\n", name, old_hex, new_hex);
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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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update(cmd->ref_name, cmd->old_sha1, cmd->new_sha1);
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cmd = cmd->next;
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}
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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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pid_t pid = fork();
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if (pid < 0)
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die("unpack fork failed");
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if (!pid) {
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execlp(unpacker, unpacker, NULL);
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die("unpack execute failed");
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}
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for (;;) {
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int status, code;
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int retval = waitpid(pid, &status, 0);
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if (retval < 0) {
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if (errno == EINTR)
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continue;
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die("waitpid failed (%s)", strerror(retval));
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}
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if (retval != pid)
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die("waitpid is confused");
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if (WIFSIGNALED(status))
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die("%s died of signal %d", unpacker, WTERMSIG(status));
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if (!WIFEXITED(status))
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die("%s died out of really strange complications", unpacker);
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code = WEXITSTATUS(status);
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if (code)
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die("%s exited with error code %d", unpacker, code);
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return;
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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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setenv("GIT_DIR", ".", 1);
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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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