mirror of
https://github.com/git/git
synced 2024-08-27 19:49:21 +00:00
230 lines
4.8 KiB
C
230 lines
4.8 KiB
C
#include "cache.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 [--unpack=executable] <git-dir> [heads]";
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static const char *unpacker = "git-unpack-objects";
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static int path_match(const char *path, int nr, char **match)
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{
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int i;
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int pathlen = strlen(path);
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for (i = 0; i < nr; i++) {
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char *s = match[i];
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int len = strlen(s);
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if (!len || len > pathlen)
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continue;
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if (memcmp(path + pathlen - len, s, len))
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continue;
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if (pathlen > len && path[pathlen - len - 1] != '/')
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continue;
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*s = 0;
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return 1;
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}
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return 0;
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}
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static void show_ref(const char *path, 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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}
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static int read_ref(const char *path, unsigned char *sha1)
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{
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int ret = -1;
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int fd = open(path, O_RDONLY);
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if (fd >= 0) {
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char buffer[60];
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if (read(fd, buffer, sizeof(buffer)) >= 40)
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ret = get_sha1_hex(buffer, sha1);
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close(fd);
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}
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return ret;
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}
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static void write_head_info(const char *base, int nr, char **match)
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{
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DIR *dir = opendir(base);
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if (dir) {
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struct dirent *de;
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int baselen = strlen(base);
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char *path = xmalloc(baselen + 257);
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memcpy(path, base, baselen);
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while ((de = readdir(dir)) != NULL) {
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char sha1[20];
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struct stat st;
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int namelen;
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if (de->d_name[0] == '.')
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continue;
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namelen = strlen(de->d_name);
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if (namelen > 255)
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continue;
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memcpy(path + baselen, de->d_name, namelen+1);
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if (lstat(path, &st) < 0)
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continue;
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if (S_ISDIR(st.st_mode)) {
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path[baselen + namelen] = '/';
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path[baselen + namelen + 1] = 0;
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write_head_info(path, nr, match);
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continue;
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}
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if (read_ref(path, sha1) < 0)
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continue;
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if (nr && !path_match(path, nr, match))
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continue;
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show_ref(path, sha1);
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}
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free(path);
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closedir(dir);
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}
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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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struct command *commands = NULL;
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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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char old_hex[60], *new_hex;
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strcpy(old_hex, sha1_to_hex(cmd->old_sha1));
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new_hex = sha1_to_hex(cmd->new_sha1);
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fprintf(stderr, "%s: %s -> %s\n", cmd->ref_name, old_hex, new_hex);
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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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setenv("GIT_DIR", ".", 1);
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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, nr_heads = 0;
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const char *dir = NULL;
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char **heads = 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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if (!strncmp(arg, "--unpack=", 9)) {
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unpacker = arg+9;
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continue;
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}
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/* Do flag handling here */
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usage(receive_pack_usage);
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}
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dir = arg;
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heads = argv;
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nr_heads = argc - i - 1;
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break;
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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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static char path[PATH_MAX];
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snprintf(path, sizeof(path), "%s.git", dir);
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if (chdir(path) < 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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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("refs/", nr_heads, heads);
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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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