*
* Copyright (C) Linus Torvalds, 2005
*/
-#include <signal.h>
#include "cache.h"
/*
* Default to not allowing changes to the list of files. The
* tool doesn't actually care, but this makes it harder to add
* files to the revision control by mistake by doing something
- * like "update-cache *" and suddenly having all the object
+ * like "git-update-cache *" and suddenly having all the object
* files be revision controlled.
*/
-static int allow_add = 0, allow_remove = 0, not_new = 0;
+static int allow_add = 0, allow_remove = 0, allow_replace = 0, not_new = 0, quiet = 0, info_only = 0;
+static int force_remove;
/* Three functions to allow overloaded pointer return; see linux/err.h */
static inline void *ERR_PTR(long error)
return (unsigned long)ptr > (unsigned long)-1000L;
}
-static int index_fd(unsigned char *sha1, int fd, struct stat *st)
-{
- z_stream stream;
- unsigned long size = st->st_size;
- int max_out_bytes = size + 200;
- void *out = xmalloc(max_out_bytes);
- void *metadata = xmalloc(200);
- int metadata_size;
- void *in;
- SHA_CTX c;
-
- in = "";
- if (size)
- in = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
- close(fd);
- if (!out || (int)(long)in == -1)
- return -1;
-
- metadata_size = 1+sprintf(metadata, "blob %lu", size);
-
- SHA1_Init(&c);
- SHA1_Update(&c, metadata, metadata_size);
- SHA1_Update(&c, in, size);
- SHA1_Final(sha1, &c);
-
- memset(&stream, 0, sizeof(stream));
- deflateInit(&stream, Z_BEST_COMPRESSION);
-
- /*
- * ASCII size + nul byte
- */
- stream.next_in = metadata;
- stream.avail_in = metadata_size;
- stream.next_out = out;
- stream.avail_out = max_out_bytes;
- while (deflate(&stream, 0) == Z_OK)
- /* nothing */;
-
- /*
- * File content
- */
- stream.next_in = in;
- stream.avail_in = size;
- while (deflate(&stream, Z_FINISH) == Z_OK)
- /*nothing */;
-
- deflateEnd(&stream);
-
- return write_sha1_buffer(sha1, out, stream.total_out);
-}
-
-/*
- * This only updates the "non-critical" parts of the directory
- * cache, ie the parts that aren't tracked by GIT, and only used
- * to validate the cache.
- */
-static void fill_stat_cache_info(struct cache_entry *ce, struct stat *st)
-{
- ce->ce_ctime.sec = htonl(st->st_ctime);
- ce->ce_mtime.sec = htonl(st->st_mtime);
-#ifdef NSEC
- ce->ce_ctime.nsec = htonl(st->st_ctim.tv_nsec);
- ce->ce_mtime.nsec = htonl(st->st_mtim.tv_nsec);
-#endif
- ce->ce_dev = htonl(st->st_dev);
- ce->ce_ino = htonl(st->st_ino);
- ce->ce_uid = htonl(st->st_uid);
- ce->ce_gid = htonl(st->st_gid);
- ce->ce_size = htonl(st->st_size);
-}
-
static int add_file_to_cache(char *path)
{
- int size, namelen;
+ int size, namelen, option, status;
struct cache_entry *ce;
struct stat st;
int fd;
-
- fd = open(path, O_RDONLY);
- if (fd < 0) {
- if (errno == ENOENT || errno == ENOTDIR) {
+ char *target;
+
+ status = lstat(path, &st);
+ if (status < 0 || S_ISDIR(st.st_mode)) {
+ /* When we used to have "path" and now we want to add
+ * "path/file", we need a way to remove "path" before
+ * being able to add "path/file". However,
+ * "git-update-cache --remove path" would not work.
+ * --force-remove can be used but this is more user
+ * friendly, especially since we can do the opposite
+ * case just fine without --force-remove.
+ */
+ if (status == 0 || (errno == ENOENT || errno == ENOTDIR)) {
if (allow_remove)
return remove_file_from_cache(path);
}
- return -1;
- }
- if (fstat(fd, &st) < 0) {
- close(fd);
- return -1;
+ return error("open(\"%s\"): %s", path, strerror(errno));
}
namelen = strlen(path);
size = cache_entry_size(namelen);
fill_stat_cache_info(ce, &st);
ce->ce_mode = create_ce_mode(st.st_mode);
ce->ce_flags = htons(namelen);
-
- if (index_fd(ce->sha1, fd, &st) < 0)
- return -1;
-
- return add_cache_entry(ce, allow_add);
-}
-
-static int match_data(int fd, void *buffer, unsigned long size)
-{
- while (size) {
- char compare[1024];
- int ret = read(fd, compare, sizeof(compare));
-
- if (ret <= 0 || ret > size || memcmp(buffer, compare, ret))
+ switch (st.st_mode & S_IFMT) {
+ case S_IFREG:
+ fd = open(path, O_RDONLY);
+ if (fd < 0)
+ return -1;
+ if (index_fd(ce->sha1, fd, &st, !info_only, NULL) < 0)
return -1;
- size -= ret;
- buffer += ret;
+ break;
+ case S_IFLNK:
+ target = xmalloc(st.st_size+1);
+ if (readlink(path, target, st.st_size+1) != st.st_size) {
+ free(target);
+ return -1;
+ }
+ if (info_only) {
+ unsigned char hdr[50];
+ int hdrlen;
+ write_sha1_file_prepare(target, st.st_size, "blob",
+ ce->sha1, hdr, &hdrlen);
+ } else if (write_sha1_file(target, st.st_size, "blob", ce->sha1))
+ return -1;
+ free(target);
+ break;
+ default:
+ return -1;
}
- return 0;
+ option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
+ option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
+ return add_cache_entry(ce, option);
}
-static int compare_data(struct cache_entry *ce, unsigned long expected_size)
+static int compare_data(struct cache_entry *ce, struct stat *st)
{
int match = -1;
int fd = open(ce->name, O_RDONLY);
if (fd >= 0) {
- void *buffer;
- unsigned long size;
- char type[10];
-
- buffer = read_sha1_file(ce->sha1, type, &size);
- if (buffer) {
- if (size == expected_size && !strcmp(type, "blob"))
- match = match_data(fd, buffer, size);
- free(buffer);
- }
+ unsigned char sha1[20];
+ if (!index_fd(sha1, fd, st, 0, NULL))
+ match = memcmp(sha1, ce->sha1, 20);
close(fd);
}
return match;
}
+static int compare_link(struct cache_entry *ce, unsigned long expected_size)
+{
+ int match = -1;
+ char *target;
+ void *buffer;
+ unsigned long size;
+ char type[10];
+ int len;
+
+ target = xmalloc(expected_size);
+ len = readlink(ce->name, target, expected_size);
+ if (len != expected_size) {
+ free(target);
+ return -1;
+ }
+ buffer = read_sha1_file(ce->sha1, type, &size);
+ if (!buffer) {
+ free(target);
+ return -1;
+ }
+ if (size == expected_size)
+ match = memcmp(buffer, target, size);
+ free(buffer);
+ free(target);
+ return match;
+}
+
/*
* "refresh" does not calculate a new sha1 file or bring the
* cache up-to-date for mode/content changes. But what it
* 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 "read-tree",
+ * 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.
*/
static struct cache_entry *refresh_entry(struct cache_entry *ce)
struct cache_entry *updated;
int changed, size;
- if (stat(ce->name, &st) < 0)
+ if (lstat(ce->name, &st) < 0)
return ERR_PTR(-errno);
- changed = cache_match_stat(ce, &st);
+ changed = ce_match_stat(ce, &st);
if (!changed)
return ce;
/*
- * If the mode has changed, there's no point in trying
+ * If the mode or type has changed, there's no point in trying
* to refresh the entry - it's not going to match
*/
- if (changed & MODE_CHANGED)
+ if (changed & (MODE_CHANGED | TYPE_CHANGED))
return ERR_PTR(-EINVAL);
- if (compare_data(ce, st.st_size))
+ switch (st.st_mode & S_IFMT) {
+ case S_IFREG:
+ if (compare_data(ce, &st))
+ return ERR_PTR(-EINVAL);
+ break;
+ case S_IFLNK:
+ if (compare_link(ce, st.st_size))
+ return ERR_PTR(-EINVAL);
+ break;
+ default:
return ERR_PTR(-EINVAL);
+ }
size = ce_size(ce);
updated = xmalloc(size);
return updated;
}
-static void refresh_cache(void)
+static int refresh_cache(void)
{
int i;
+ int has_errors = 0;
for (i = 0; i < active_nr; i++) {
struct cache_entry *ce, *new;
ce = active_cache[i];
if (ce_stage(ce)) {
printf("%s: needs merge\n", ce->name);
+ has_errors = 1;
while ((i < active_nr) &&
! strcmp(active_cache[i]->name, ce->name))
i++;
new = refresh_entry(ce);
if (IS_ERR(new)) {
- if (!(not_new && PTR_ERR(new) == -ENOENT))
- printf("%s: needs update\n", ce->name);
+ if (not_new && PTR_ERR(new) == -ENOENT)
+ continue;
+ 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;
}
/*
* We fundamentally don't like some paths: we don't want
- * dot or dot-dot anywhere, and in fact, we don't even want
- * any other dot-files (.git or anything else). They
- * are hidden, for chist sake.
+ * dot or dot-dot anywhere, and for obvious reasons don't
+ * want to recurse into ".git" either.
*
* Also, we don't want double slashes or slashes at the
* end that can make pathnames ambiguous.
*/
+static int verify_dotfile(const char *rest)
+{
+ /*
+ * The first character was '.', but that
+ * has already been discarded, we now test
+ * the rest.
+ */
+ switch (*rest) {
+ /* "." is not allowed */
+ case '\0': case '/':
+ return 0;
+
+ /*
+ * ".git" followed by NUL or slash is bad. This
+ * shares the path end test with the ".." case.
+ */
+ case 'g':
+ if (rest[1] != 'i')
+ break;
+ if (rest[2] != 't')
+ break;
+ rest += 2;
+ /* fallthrough */
+ case '.':
+ if (rest[1] == '\0' || rest[1] == '/')
+ return 0;
+ }
+ return 1;
+}
+
static int verify_path(char *path)
{
char c;
if (c == '/') {
inside:
c = *path++;
- if (c != '/' && c != '.' && c != '\0')
+ switch (c) {
+ default:
continue;
+ case '/': case '\0':
+ break;
+ case '.':
+ if (verify_dotfile(path))
+ continue;
+ }
return 0;
}
c = *path++;
static int add_cacheinfo(char *arg1, char *arg2, char *arg3)
{
- int size, len;
+ int size, len, option;
unsigned int mode;
unsigned char sha1[20];
struct cache_entry *ce;
memcpy(ce->name, arg3, len);
ce->ce_flags = htons(len);
ce->ce_mode = create_ce_mode(mode);
- return add_cache_entry(ce, allow_add);
+ option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
+ option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
+ return add_cache_entry(ce, option);
}
-static const char *lockfile_name = NULL;
-
-static void remove_lock_file(void)
-{
- if (lockfile_name)
- unlink(lockfile_name);
-}
-
-static void remove_lock_file_on_signal(int signo)
-{
- remove_lock_file();
-}
+static struct cache_file cache_file;
int main(int argc, char **argv)
{
- int i, newfd, entries;
+ int i, newfd, entries, has_errors = 0;
int allow_options = 1;
- static char lockfile[MAXPATHLEN+1];
- const char *indexfile = get_index_file();
-
- snprintf(lockfile, sizeof(lockfile), "%s.lock", indexfile);
- newfd = open(lockfile, O_RDWR | O_CREAT | O_EXCL, 0600);
+ newfd = hold_index_file_for_update(&cache_file, get_index_file());
if (newfd < 0)
die("unable to create new cachefile");
- signal(SIGINT, remove_lock_file_on_signal);
- atexit(remove_lock_file);
- lockfile_name = lockfile;
-
entries = read_cache();
if (entries < 0)
die("cache corrupted");
allow_options = 0;
continue;
}
+ if (!strcmp(path, "-q")) {
+ quiet = 1;
+ continue;
+ }
if (!strcmp(path, "--add")) {
allow_add = 1;
continue;
}
+ if (!strcmp(path, "--replace")) {
+ allow_replace = 1;
+ continue;
+ }
if (!strcmp(path, "--remove")) {
allow_remove = 1;
continue;
}
if (!strcmp(path, "--refresh")) {
- refresh_cache();
+ has_errors |= refresh_cache();
continue;
}
if (!strcmp(path, "--cacheinfo")) {
- if (i+3 >= argc || add_cacheinfo(argv[i+1], argv[i+2], argv[i+3]))
- die("update-cache: --cacheinfo <mode> <sha1> <path>");
+ if (i+3 >= argc)
+ die("git-update-cache: --cacheinfo <mode> <sha1> <path>");
+ if (add_cacheinfo(argv[i+1], argv[i+2], argv[i+3]))
+ die("git-update-cache: --cacheinfo cannot add %s", argv[i+3]);
i += 3;
continue;
}
+ if (!strcmp(path, "--info-only")) {
+ info_only = 1;
+ continue;
+ }
+ if (!strcmp(path, "--force-remove")) {
+ force_remove = 1;
+ continue;
+ }
+
if (!strcmp(path, "--ignore-missing")) {
not_new = 1;
continue;
fprintf(stderr, "Ignoring path %s\n", argv[i]);
continue;
}
+ if (force_remove) {
+ if (remove_file_from_cache(path))
+ die("git-update-cache: --force-remove cannot remove %s", path);
+ continue;
+ }
if (add_file_to_cache(path))
die("Unable to add %s to database", path);
}
- if (write_cache(newfd, active_cache, active_nr) || rename(lockfile, indexfile))
+ if (write_cache(newfd, active_cache, active_nr) ||
+ commit_index_file(&cache_file))
die("Unable to write new cachefile");
- lockfile_name = NULL;
- return 0;
+ return has_errors ? 1 : 0;
}