#include "cache.h"
+#include "refs.h"
+#include "pkt-line.h"
#include <sys/wait.h>
-static const char receive_pack_usage[] = "git-receive-pack [--unpack=executable] <git-dir> [heads]";
+static const char receive_pack_usage[] = "git-receive-pack <git-dir>";
static const char *unpacker = "git-unpack-objects";
-static int path_match(const char *path, int nr, char **match)
+static int show_ref(const char *path, const unsigned char *sha1)
{
- int i;
- int pathlen = strlen(path);
-
- for (i = 0; i < nr; i++) {
- char *s = match[i];
- int len = strlen(s);
-
- if (!len || len > pathlen)
- continue;
- if (memcmp(path + pathlen - len, s, len))
- continue;
- if (pathlen > len && path[pathlen - len - 1] != '/')
- continue;
- *s = 0;
- return 1;
- }
+ packet_write(1, "%s %s\n", sha1_to_hex(sha1), path);
return 0;
}
-static void safe_write(int fd, const void *buf, unsigned n)
+static void write_head_info(void)
{
- while (n) {
- int ret = write(fd, buf, n);
- if (ret > 0) {
- buf += ret;
- n -= ret;
- continue;
- }
- if (!ret)
- die("write error (disk full?)");
- if (errno == EAGAIN || errno == EINTR)
- continue;
- die("write error (%s)", strerror(errno));
- }
+ for_each_ref(show_ref);
}
-/*
- * If we buffered things up above (we don't, but we should),
- * we'd flush it here
- */
-static void flush_safe(int fd)
-{
-}
-
-/*
- * Write a packetized stream, where each line is preceded by
- * its length (including the header) as a 4-byte hex number.
- * A length of 'zero' means end of stream (and a length of 1-3
- * would be an error).
- */
-#define hex(a) (hexchar[(a) & 15])
-static void packet_write(const char *fmt, ...)
-{
- static char buffer[1000];
- static char hexchar[] = "0123456789abcdef";
- va_list args;
- unsigned n;
-
- va_start(args, fmt);
- n = vsnprintf(buffer + 4, sizeof(buffer) - 4, fmt, args);
- va_end(args);
- if (n >= sizeof(buffer)-4)
- die("protocol error: impossibly long line");
- n += 4;
- buffer[0] = hex(n >> 12);
- buffer[1] = hex(n >> 8);
- buffer[2] = hex(n >> 4);
- buffer[3] = hex(n);
- safe_write(1, buffer, n);
-}
+struct command {
+ struct command *next;
+ unsigned char old_sha1[20];
+ unsigned char new_sha1[20];
+ char ref_name[0];
+};
-static void show_ref(const char *path, unsigned char *sha1)
-{
- packet_write("%s %s\n", sha1_to_hex(sha1), path);
-}
+static struct command *commands = NULL;
-static int read_ref(const char *path, unsigned char *sha1)
+static int is_all_zeroes(const char *hex)
{
- int ret = -1;
- int fd = open(path, O_RDONLY);
-
- if (fd >= 0) {
- char buffer[60];
- if (read(fd, buffer, sizeof(buffer)) >= 40)
- ret = get_sha1_hex(buffer, sha1);
- close(fd);
- }
- return ret;
+ int i;
+ for (i = 0; i < 40; i++)
+ if (*hex++ != '0')
+ return 0;
+ return 1;
}
-static void write_head_info(const char *base, int nr, char **match)
+static int verify_old_ref(const char *name, char *hex_contents)
{
- DIR *dir = opendir(base);
-
- if (dir) {
- struct dirent *de;
- int baselen = strlen(base);
- char *path = xmalloc(baselen + 257);
- memcpy(path, base, baselen);
-
- while ((de = readdir(dir)) != NULL) {
- char sha1[20];
- struct stat st;
- int namelen;
+ int fd, ret;
+ char buffer[60];
- if (de->d_name[0] == '.')
- continue;
- namelen = strlen(de->d_name);
- if (namelen > 255)
- continue;
- memcpy(path + baselen, de->d_name, namelen+1);
- if (lstat(path, &st) < 0)
- continue;
- if (S_ISDIR(st.st_mode)) {
- path[baselen + namelen] = '/';
- path[baselen + namelen + 1] = 0;
- write_head_info(path, nr, match);
- continue;
- }
- if (read_ref(path, sha1) < 0)
- continue;
- if (nr && !path_match(path, nr, match))
- continue;
- show_ref(path, sha1);
- }
- free(path);
- closedir(dir);
- }
+ 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;
}
-/*
- * This is all pretty stupid, but we use this packetized line
- * format to make a streaming format possible without ever
- * over-running the read buffers. That way we'll never read
- * into what might be the pack data (which should go to another
- * process entirely).
- *
- * The writing side could use stdio, but since the reading
- * side can't, we stay with pure read/write interfaces.
- */
-static void safe_read(int fd, void *buffer, unsigned size)
+static void update(const char *name, unsigned char *old_sha1, unsigned char *new_sha1)
{
- int n = 0;
-
- while (n < size) {
- int ret = read(0, buffer + n, size - n);
- if (ret < 0) {
- if (errno == EINTR || errno == EAGAIN)
- continue;
- die("read error (%s)", strerror(errno));
- }
- if (!ret)
- die("unexpected EOF");
- n += ret;
+ 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))
+ die("unpack should have generated %s, but I can't find it!", new_hex);
+
+ newfd = open(lock_name, O_CREAT | O_EXCL | O_WRONLY, 0666);
+ if (newfd < 0)
+ die("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);
+ die("unable to write %s", lock_name);
}
-}
-
-static int safe_read_line(char *buffer, unsigned size)
-{
- int n, len;
-
- safe_read(0, buffer, 4);
-
- len = 0;
- for (n = 0; n < 4; n++) {
- unsigned char c = buffer[n];
- len <<= 4;
- if (c >= '0' && c <= '9') {
- len += c - '0';
- continue;
- }
- if (c >= 'a' && c <= 'f') {
- len += c - 'a' + 10;
- continue;
- }
- if (c >= 'A' && c <= 'F') {
- len += c - 'A' + 10;
- continue;
- }
- die("protocol error: bad line length character");
+ if (verify_old_ref(name, old_hex) < 0) {
+ unlink(lock_name);
+ die("%s changed during push", name);
}
- if (!len)
- return 0;
- if (len < 4 || len >= size)
- die("protocol error: bad line length %d", len);
- safe_read(0, buffer + 4, len - 4);
- buffer[len] = 0;
- return len;
+ if (rename(lock_name, name) < 0) {
+ unlink(lock_name);
+ die("unable to replace %s", name);
+ }
+ fprintf(stderr, "%s: %s -> %s\n", name, old_hex, new_hex);
}
-struct line {
- struct line *next;
- char data[0];
-};
-
-struct line *commands = NULL;
/*
* This gets called after(if) we've successfully
*/
static void execute_commands(void)
{
- struct line *line = commands;
+ struct command *cmd = commands;
- while (line) {
- printf("%s", line->data);
- line = line->next;
+ while (cmd) {
+ update(cmd->ref_name, cmd->old_sha1, cmd->new_sha1);
+ cmd = cmd->next;
}
}
static void read_head_info(void)
{
- struct line **p = &commands;
+ struct command **p = &commands;
for (;;) {
static char line[1000];
- int len = safe_read_line(line, sizeof(line));
- struct line *n;
+ unsigned char old_sha1[20], new_sha1[20];
+ struct command *cmd;
+ int len;
+
+ len = packet_read_line(0, line, sizeof(line));
if (!len)
break;
- n = xmalloc(sizeof(struct line) + len);
- n->next = NULL;
- memcpy(n->data, line + 4, len - 3);
- *p = n;
- p = &n->next;
+ 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;
}
}
if (pid < 0)
die("unpack fork failed");
if (!pid) {
- char *const envp[] = { "GIT_DIR=.", NULL };
- execle(unpacker, unpacker, NULL, envp);
+ execlp(unpacker, unpacker, NULL);
die("unpack execute failed");
}
int main(int argc, char **argv)
{
- int i, nr_heads = 0;
+ int i;
const char *dir = NULL;
- char **heads = NULL;
argv++;
for (i = 1; i < argc; i++) {
const char *arg = *argv++;
if (*arg == '-') {
- if (!strncmp(arg, "--unpack=", 9)) {
- unpacker = arg+9;
- continue;
- }
/* Do flag handling here */
usage(receive_pack_usage);
}
+ if (dir)
+ usage(receive_pack_usage);
dir = arg;
- heads = argv;
- nr_heads = argc - i - 1;
- break;
}
if (!dir)
usage(receive_pack_usage);
/* chdir to the directory. If that fails, try appending ".git" */
if (chdir(dir) < 0) {
- static char path[PATH_MAX];
- snprintf(path, sizeof(path), "%s.git", dir);
- if (chdir(path) < 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("refs/", nr_heads, heads);
+ write_head_info();
/* EOF */
- safe_write(1, "0000", 4);
- flush_safe(1);
+ packet_flush(1);
read_head_info();
- unpack();
- execute_commands();
+ if (commands) {
+ unpack();
+ execute_commands();
+ }
return 0;
}
projects / git.git / blobdiff