struct cache_tree *active_cache_tree = NULL;
+int cache_errno = 0;
+
+static void *cache_mmap = NULL;
+static size_t cache_mmap_size = 0;
+
/*
* This only updates the "non-critical" parts of the directory
* cache, ie the parts that aren't tracked by GIT, and only used
unsigned char sha1[20];
if (!index_fd(sha1, fd, st, 0, NULL))
match = memcmp(sha1, ce->sha1, 20);
- close(fd);
+ /* index_fd() closed the file descriptor already */
}
return match;
}
return changed;
}
-int ce_match_stat(struct cache_entry *ce, struct stat *st, int ignore_valid)
+int ce_match_stat(struct cache_entry *ce, struct stat *st, int options)
{
unsigned int changed;
+ int ignore_valid = options & 01;
+ int assume_racy_is_modified = options & 02;
/*
* If it's marked as always valid in the index, it's
*/
if (!changed &&
index_file_timestamp &&
- index_file_timestamp <= ntohl(ce->ce_mtime.sec))
- changed |= ce_modified_check_fs(ce, st);
+ index_file_timestamp <= ntohl(ce->ce_mtime.sec)) {
+ if (assume_racy_is_modified)
+ changed |= DATA_CHANGED;
+ else
+ changed |= ce_modified_check_fs(ce, st);
+ }
return changed;
}
return 0;
}
+int add_file_to_index(const char *path, int verbose)
+{
+ int size, namelen;
+ struct stat st;
+ struct cache_entry *ce;
+
+ if (lstat(path, &st))
+ die("%s: unable to stat (%s)", path, strerror(errno));
+
+ if (!S_ISREG(st.st_mode) && !S_ISLNK(st.st_mode))
+ die("%s: can only add regular files or symbolic links", path);
+
+ namelen = strlen(path);
+ size = cache_entry_size(namelen);
+ ce = xcalloc(1, size);
+ memcpy(ce->name, path, namelen);
+ ce->ce_flags = htons(namelen);
+ fill_stat_cache_info(ce, &st);
+
+ ce->ce_mode = create_ce_mode(st.st_mode);
+ if (!trust_executable_bit) {
+ /* If there is an existing entry, pick the mode bits
+ * from it.
+ */
+ int pos = cache_name_pos(path, namelen);
+ if (pos >= 0)
+ ce->ce_mode = active_cache[pos]->ce_mode;
+ }
+
+ if (index_path(ce->sha1, path, &st, 1))
+ die("unable to index file %s", path);
+ if (add_cache_entry(ce, ADD_CACHE_OK_TO_ADD))
+ die("unable to add %s to index",path);
+ if (verbose)
+ printf("add '%s'\n", path);
+ cache_tree_invalidate_path(active_cache_tree, path);
+ return 0;
+}
+
int ce_same_name(struct cache_entry *a, struct cache_entry *b)
{
int len = ce_namelen(a);
return 0;
}
+/*
+ * "refresh" does not calculate a new sha1 file or bring the
+ * cache up-to-date for mode/content changes. But what it
+ * _does_ do is to "re-match" the stat information of a file
+ * with the cache, so that you can refresh the cache for a
+ * file that hasn't been changed but where the stat entry is
+ * out of date.
+ *
+ * For example, you'd want to do this after doing a "git-read-tree",
+ * to link up the stat cache details with the proper files.
+ */
+struct cache_entry *refresh_cache_entry(struct cache_entry *ce, int really)
+{
+ struct stat st;
+ struct cache_entry *updated;
+ int changed, size;
+
+ if (lstat(ce->name, &st) < 0) {
+ cache_errno = errno;
+ return NULL;
+ }
+
+ changed = ce_match_stat(ce, &st, really);
+ if (!changed) {
+ if (really && assume_unchanged &&
+ !(ce->ce_flags & htons(CE_VALID)))
+ ; /* mark this one VALID again */
+ else
+ return ce;
+ }
+
+ if (ce_modified(ce, &st, really)) {
+ cache_errno = EINVAL;
+ return NULL;
+ }
+
+ size = ce_size(ce);
+ updated = xmalloc(size);
+ memcpy(updated, ce, size);
+ fill_stat_cache_info(updated, &st);
+
+ /* In this case, if really is not set, we should leave
+ * CE_VALID bit alone. Otherwise, paths marked with
+ * --no-assume-unchanged (i.e. things to be edited) will
+ * reacquire CE_VALID bit automatically, which is not
+ * really what we want.
+ */
+ if (!really && assume_unchanged && !(ce->ce_flags & htons(CE_VALID)))
+ updated->ce_flags &= ~htons(CE_VALID);
+
+ return updated;
+}
+
+int refresh_cache(unsigned int flags)
+{
+ int i;
+ int has_errors = 0;
+ int really = (flags & REFRESH_REALLY) != 0;
+ int allow_unmerged = (flags & REFRESH_UNMERGED) != 0;
+ int quiet = (flags & REFRESH_QUIET) != 0;
+ int not_new = (flags & REFRESH_IGNORE_MISSING) != 0;
+
+ for (i = 0; i < active_nr; i++) {
+ struct cache_entry *ce, *new;
+ ce = active_cache[i];
+ if (ce_stage(ce)) {
+ while ((i < active_nr) &&
+ ! strcmp(active_cache[i]->name, ce->name))
+ i++;
+ i--;
+ if (allow_unmerged)
+ continue;
+ printf("%s: needs merge\n", ce->name);
+ has_errors = 1;
+ continue;
+ }
+
+ new = refresh_cache_entry(ce, really);
+ if (new == ce)
+ continue;
+ if (!new) {
+ if (not_new && cache_errno == ENOENT)
+ continue;
+ if (really && cache_errno == EINVAL) {
+ /* If we are doing --really-refresh that
+ * means the index is not valid anymore.
+ */
+ ce->ce_flags &= ~htons(CE_VALID);
+ active_cache_changed = 1;
+ }
+ if (quiet)
+ continue;
+ printf("%s: needs update\n", ce->name);
+ has_errors = 1;
+ continue;
+ }
+ active_cache_changed = 1;
+ /* You can NOT just free active_cache[i] here, since it
+ * might not be necessarily malloc()ed but can also come
+ * from mmap(). */
+ active_cache[i] = new;
+ }
+ return has_errors;
+}
+
static int verify_hdr(struct cache_header *hdr, unsigned long size)
{
SHA_CTX c;
SHA1_Init(&c);
SHA1_Update(&c, hdr, size - 20);
SHA1_Final(sha1, &c);
- if (memcmp(sha1, (void *)hdr + size - 20, 20))
+ if (memcmp(sha1, (char *) hdr + size - 20, 20))
return error("bad index file sha1 signature");
return 0;
}
}
int read_cache(void)
+{
+ return read_cache_from(get_index_file());
+}
+
+/* remember to discard_cache() before reading a different cache! */
+int read_cache_from(const char *path)
{
int fd, i;
struct stat st;
- unsigned long size, offset;
- void *map;
+ unsigned long offset;
struct cache_header *hdr;
errno = EBUSY;
- if (active_cache)
+ if (cache_mmap)
return active_nr;
errno = ENOENT;
index_file_timestamp = 0;
- fd = open(get_index_file(), O_RDONLY);
+ fd = open(path, O_RDONLY);
if (fd < 0) {
if (errno == ENOENT)
return 0;
die("index file open failed (%s)", strerror(errno));
}
- size = 0; // avoid gcc warning
- map = MAP_FAILED;
+ cache_mmap = MAP_FAILED;
if (!fstat(fd, &st)) {
- size = st.st_size;
+ cache_mmap_size = st.st_size;
errno = EINVAL;
- if (size >= sizeof(struct cache_header) + 20)
- map = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
+ if (cache_mmap_size >= sizeof(struct cache_header) + 20)
+ cache_mmap = mmap(NULL, cache_mmap_size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
}
close(fd);
- if (map == MAP_FAILED)
+ if (cache_mmap == MAP_FAILED)
die("index file mmap failed (%s)", strerror(errno));
- hdr = map;
- if (verify_hdr(hdr, size) < 0)
+ hdr = cache_mmap;
+ if (verify_hdr(hdr, cache_mmap_size) < 0)
goto unmap;
active_nr = ntohl(hdr->hdr_entries);
offset = sizeof(*hdr);
for (i = 0; i < active_nr; i++) {
- struct cache_entry *ce = map + offset;
+ struct cache_entry *ce = (struct cache_entry *) ((char *) cache_mmap + offset);
offset = offset + ce_size(ce);
active_cache[i] = ce;
}
index_file_timestamp = st.st_mtime;
- while (offset <= size - 20 - 8) {
+ while (offset <= cache_mmap_size - 20 - 8) {
/* After an array of active_nr index entries,
* there can be arbitrary number of extended
* sections, each of which is prefixed with
* in 4-byte network byte order.
*/
unsigned long extsize;
- memcpy(&extsize, map + offset + 4, 4);
+ memcpy(&extsize, (char *) cache_mmap + offset + 4, 4);
extsize = ntohl(extsize);
- if (read_index_extension(map + offset,
- map + offset + 8, extsize) < 0)
+ if (read_index_extension(((const char *) cache_mmap) + offset,
+ (char *) cache_mmap + offset + 8,
+ extsize) < 0)
goto unmap;
offset += 8;
offset += extsize;
return active_nr;
unmap:
- munmap(map, size);
+ munmap(cache_mmap, cache_mmap_size);
errno = EINVAL;
die("index file corrupt");
}
static unsigned char write_buffer[WRITE_BUFFER_SIZE];
static unsigned long write_buffer_len;
+static int ce_write_flush(SHA_CTX *context, int fd)
+{
+ unsigned int buffered = write_buffer_len;
+ if (buffered) {
+ SHA1_Update(context, write_buffer, buffered);
+ if (write(fd, write_buffer, buffered) != buffered)
+ return -1;
+ write_buffer_len = 0;
+ }
+ return 0;
+}
+
static int ce_write(SHA_CTX *context, int fd, void *data, unsigned int len)
{
while (len) {
memcpy(write_buffer + buffered, data, partial);
buffered += partial;
if (buffered == WRITE_BUFFER_SIZE) {
- SHA1_Update(context, write_buffer, WRITE_BUFFER_SIZE);
- if (write(fd, write_buffer, WRITE_BUFFER_SIZE) != WRITE_BUFFER_SIZE)
+ write_buffer_len = buffered;
+ if (ce_write_flush(context, fd))
return -1;
buffered = 0;
}
write_buffer_len = buffered;
len -= partial;
- data += partial;
+ data = (char *) data + partial;
}
return 0;
}
static int write_index_ext_header(SHA_CTX *context, int fd,
- unsigned long ext, unsigned long sz)
+ unsigned int ext, unsigned int sz)
{
ext = htonl(ext);
sz = htonl(sz);
- if ((ce_write(context, fd, &ext, 4) < 0) ||
- (ce_write(context, fd, &sz, 4) < 0))
- return -1;
- return 0;
+ return ((ce_write(context, fd, &ext, 4) < 0) ||
+ (ce_write(context, fd, &sz, 4) < 0)) ? -1 : 0;
}
static int ce_flush(SHA_CTX *context, int fd)
/* Append the SHA1 signature at the end */
SHA1_Final(write_buffer + left, context);
left += 20;
- if (write(fd, write_buffer, left) != left)
- return -1;
- return 0;
+ return (write(fd, write_buffer, left) != left) ? -1 : 0;
}
static void ce_smudge_racily_clean_entry(struct cache_entry *ce)
* $ echo filfre >nitfol
* $ git-update-index --add nitfol
*
- * but it does not. Whe the second update-index runs,
+ * but it does not. When the second update-index runs,
* it notices that the entry "frotz" has the same timestamp
* as index, and if we were to smudge it by resetting its
* size to zero here, then the object name recorded
{
SHA_CTX c;
struct cache_header hdr;
- int i, removed;
+ int i, removed, recent;
+ struct stat st;
+ time_t now;
for (i = removed = 0; i < entries; i++)
if (!cache[i]->ce_mode)
return -1;
}
}
+
+ /*
+ * To prevent later ce_match_stat() from always falling into
+ * check_fs(), if we have too many entries that can trigger
+ * racily clean check, we are better off delaying the return.
+ * We arbitrarily say if more than 20 paths or 25% of total
+ * paths are very new, we delay the return until the index
+ * file gets a new timestamp.
+ *
+ * NOTE! NOTE! NOTE!
+ *
+ * This assumes that nobody is touching the working tree while
+ * we are updating the index.
+ */
+
+ /* Make sure that the new index file has st_mtime
+ * that is current enough -- ce_write() batches the data
+ * so it might not have written anything yet.
+ */
+ ce_write_flush(&c, newfd);
+
+ now = fstat(newfd, &st) ? 0 : st.st_mtime;
+ if (now) {
+ recent = 0;
+ for (i = 0; i < entries; i++) {
+ struct cache_entry *ce = cache[i];
+ time_t entry_time = (time_t) ntohl(ce->ce_mtime.sec);
+ if (!ce->ce_mode)
+ continue;
+ if (now && now <= entry_time)
+ recent++;
+ }
+ if (20 < recent && entries <= recent * 4) {
+#if 0
+ fprintf(stderr, "entries %d\n", entries);
+ fprintf(stderr, "recent %d\n", recent);
+ fprintf(stderr, "now %lu\n", now);
+#endif
+ while (!fstat(newfd, &st) && st.st_mtime <= now) {
+ off_t where = lseek(newfd, 0, SEEK_CUR);
+ sleep(1);
+ if ((where == (off_t) -1) ||
+ (write(newfd, "", 1) != 1) ||
+ (lseek(newfd, -1, SEEK_CUR) != where) ||
+ ftruncate(newfd, where))
+ break;
+ }
+ }
+ }
return ce_flush(&c, newfd);
}