diff options
Diffstat (limited to 'update-index.c')
| -rw-r--r-- | update-index.c | 407 |
1 files changed, 407 insertions, 0 deletions
diff --git a/update-index.c b/update-index.c new file mode 100644 index 0000000000..d10dfd9430 --- /dev/null +++ b/update-index.c @@ -0,0 +1,407 @@ +/* + * GIT - The information manager from hell + * + * Copyright (C) Linus Torvalds, 2005 + */ +#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 "git-update-index *" and suddenly having all the object + * files be revision controlled. + */ +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 (void *) error; +} + +static inline long PTR_ERR(const void *ptr) +{ + return (long) ptr; +} + +static inline long IS_ERR(const void *ptr) +{ + return (unsigned long)ptr > (unsigned long)-1000L; +} + +static int add_file_to_cache(char *path) +{ + int size, namelen, option, status; + struct cache_entry *ce; + struct stat st; + int fd; + 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-index --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); + } + if (0 == status) + return error("%s: is a directory", path); + else + return error("lstat(\"%s\"): %s", path, + strerror(errno)); + } + namelen = strlen(path); + size = cache_entry_size(namelen); + ce = xmalloc(size); + memset(ce, 0, size); + memcpy(ce->name, path, namelen); + fill_stat_cache_info(ce, &st); + ce->ce_mode = create_ce_mode(st.st_mode); + ce->ce_flags = htons(namelen); + 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; + 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; + } + 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, struct stat *st) +{ + int match = -1; + int fd = open(ce->name, O_RDONLY); + + if (fd >= 0) { + 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 + * _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. + */ +static struct cache_entry *refresh_entry(struct cache_entry *ce) +{ + struct stat st; + struct cache_entry *updated; + int changed, size; + + if (lstat(ce->name, &st) < 0) + return ERR_PTR(-errno); + + changed = ce_match_stat(ce, &st); + if (!changed) + return ce; + + /* + * 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 | TYPE_CHANGED)) + return ERR_PTR(-EINVAL); + + 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); + memcpy(updated, ce, size); + fill_stat_cache_info(updated, &st); + return updated; +} + +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++; + i--; + continue; + } + + new = refresh_entry(ce); + if (IS_ERR(new)) { + 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 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; + + goto inside; + for (;;) { + if (!c) + return 1; + if (c == '/') { +inside: + c = *path++; + 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, option; + unsigned int mode; + unsigned char sha1[20]; + struct cache_entry *ce; + + if (sscanf(arg1, "%o", &mode) != 1) + return -1; + if (get_sha1_hex(arg2, sha1)) + return -1; + if (!verify_path(arg3)) + return -1; + + len = strlen(arg3); + size = cache_entry_size(len); + ce = xmalloc(size); + memset(ce, 0, size); + + memcpy(ce->sha1, sha1, 20); + memcpy(ce->name, arg3, len); + ce->ce_flags = htons(len); + ce->ce_mode = create_ce_mode(mode); + 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 struct cache_file cache_file; + +int main(int argc, char **argv) +{ + int i, newfd, entries, has_errors = 0; + int allow_options = 1; + const char *prefix = setup_git_directory(); + + newfd = hold_index_file_for_update(&cache_file, get_index_file()); + if (newfd < 0) + die("unable to create new cachefile"); + + entries = read_cache(); + if (entries < 0) + die("cache corrupted"); + + for (i = 1 ; i < argc; i++) { + char *path = argv[i]; + + if (allow_options && *path == '-') { + if (!strcmp(path, "--")) { + 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")) { + has_errors |= refresh_cache(); + continue; + } + if (!strcmp(path, "--cacheinfo")) { + if (i+3 >= argc) + die("git-update-index: --cacheinfo <mode> <sha1> <path>"); + if (add_cacheinfo(argv[i+1], argv[i+2], argv[i+3])) + die("git-update-index: --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; + } + die("unknown option %s", path); + } + path = prefix_path(prefix, prefix ? strlen(prefix) : 0, path); + if (!verify_path(path)) { + fprintf(stderr, "Ignoring path %s\n", argv[i]); + continue; + } + if (force_remove) { + if (remove_file_from_cache(path)) + die("git-update-index: --force-remove cannot remove %s", path); + continue; + } + if (add_file_to_cache(path)) + die("Unable to add %s to database; maybe you want to use --add option?", path); + } + if (write_cache(newfd, active_cache, active_nr) || + commit_index_file(&cache_file)) + die("Unable to write new cachefile"); + + return has_errors ? 1 : 0; +} |