X-Git-Url: https://git.verplant.org/?a=blobdiff_plain;f=update-cache.c;h=16e1bb9aea6413db35039042289605124d759501;hb=0fc65a4572625405ff6dd9d8c16d835f2b1ebd49;hp=68a0ae0444d700593198c748a00c9f2b0841bda8;hpb=711cf3a026a539f68ab647e012f145a03e12a5e7;p=git.git diff --git a/update-cache.c b/update-cache.c index 68a0ae04..16e1bb9a 100644 --- a/update-cache.c +++ b/update-cache.c @@ -3,6 +3,7 @@ * * Copyright (C) Linus Torvalds, 2005 */ +#include #include "cache.h" /* @@ -12,21 +13,49 @@ * like "update-cache *" and suddenly having all the object * files be revision controlled. */ -static int allow_add = 0, allow_remove = 0; +static int allow_add = 0, allow_remove = 0, not_new = 0; -static int index_fd(const char *path, int namelen, struct cache_entry *ce, int fd, struct stat *st) +/* 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 index_fd(unsigned char *sha1, int fd, struct stat *st) { z_stream stream; - int max_out_bytes = namelen + st->st_size + 200; - void *out = malloc(max_out_bytes); - void *metadata = malloc(namelen + 200); - void *in = mmap(NULL, st->st_size, PROT_READ, MAP_PRIVATE, fd, 0); + 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); @@ -34,7 +63,7 @@ static int index_fd(const char *path, int namelen, struct cache_entry *ce, int f * ASCII size + nul byte */ stream.next_in = metadata; - stream.avail_in = 1+sprintf(metadata, "blob %lu", (unsigned long) st->st_size); + stream.avail_in = metadata_size; stream.next_out = out; stream.avail_out = max_out_bytes; while (deflate(&stream, 0) == Z_OK) @@ -44,17 +73,13 @@ static int index_fd(const char *path, int namelen, struct cache_entry *ce, int f * File content */ stream.next_in = in; - stream.avail_in = st->st_size; + stream.avail_in = size; while (deflate(&stream, Z_FINISH) == Z_OK) /*nothing */; deflateEnd(&stream); - SHA1_Init(&c); - SHA1_Update(&c, out, stream.total_out); - SHA1_Final(ce->sha1, &c); - - return write_sha1_buffer(ce->sha1, out, stream.total_out); + return write_sha1_buffer(sha1, out, stream.total_out); } /* @@ -64,14 +89,17 @@ static int index_fd(const char *path, int namelen, struct cache_entry *ce, int f */ static void fill_stat_cache_info(struct cache_entry *ce, struct stat *st) { - ce->ctime.sec = st->st_ctime; - ce->ctime.nsec = st->st_ctim.tv_nsec; - ce->mtime.sec = st->st_mtime; - ce->mtime.nsec = st->st_mtim.tv_nsec; - ce->st_dev = st->st_dev; - ce->st_ino = st->st_ino; - ce->st_uid = st->st_uid; - ce->st_gid = st->st_gid; + 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) @@ -95,15 +123,14 @@ static int add_file_to_cache(char *path) } namelen = strlen(path); size = cache_entry_size(namelen); - ce = malloc(size); + ce = xmalloc(size); memset(ce, 0, size); memcpy(ce->name, path, namelen); fill_stat_cache_info(ce, &st); - ce->st_mode = st.st_mode; - ce->st_size = st.st_size; - ce->namelen = namelen; + ce->ce_mode = create_ce_mode(st.st_mode); + ce->ce_flags = htons(namelen); - if (index_fd(path, namelen, ce, fd, &st) < 0) + if (index_fd(ce->sha1, fd, &st) < 0) return -1; return add_cache_entry(ce, allow_add); @@ -123,7 +150,7 @@ static int match_data(int fd, void *buffer, unsigned long size) return 0; } -static int compare_data(struct cache_entry *ce) +static int compare_data(struct cache_entry *ce, unsigned long expected_size) { int match = -1; int fd = open(ce->name, O_RDONLY); @@ -135,7 +162,7 @@ static int compare_data(struct cache_entry *ce) buffer = read_sha1_file(ce->sha1, type, &size); if (buffer) { - if (size == ce->st_size && !strcmp(type, "blob")) + if (size == expected_size && !strcmp(type, "blob")) match = match_data(fd, buffer, size); free(buffer); } @@ -162,24 +189,24 @@ static struct cache_entry *refresh_entry(struct cache_entry *ce) int changed, size; if (stat(ce->name, &st) < 0) - return NULL; + return ERR_PTR(-errno); changed = cache_match_stat(ce, &st); if (!changed) return ce; /* - * If the length has changed, there's no point in trying + * If the mode has changed, there's no point in trying * to refresh the entry - it's not going to match */ - if (changed & (DATA_CHANGED | MODE_CHANGED)) - return NULL; + if (changed & MODE_CHANGED) + return ERR_PTR(-EINVAL); - if (compare_data(ce)) - return NULL; + if (compare_data(ce, st.st_size)) + return ERR_PTR(-EINVAL); size = ce_size(ce); - updated = malloc(size); + updated = xmalloc(size); memcpy(updated, ce, size); fill_stat_cache_info(updated, &st); return updated; @@ -190,11 +217,21 @@ static void refresh_cache(void) int i; for (i = 0; i < active_nr; i++) { - struct cache_entry *ce = active_cache[i]; - struct cache_entry *new = refresh_entry(ce); + struct cache_entry *ce, *new; + ce = active_cache[i]; + if (ce_stage(ce)) { + printf("%s: needs merge\n", ce->name); + while ((i < active_nr) && + ! strcmp(active_cache[i]->name, ce->name)) + i++; + i--; + continue; + } - if (!new) { - printf("%s: needs update\n", ce->name); + new = refresh_entry(ce); + if (IS_ERR(new)) { + if (!(not_new && PTR_ERR(new) == -ENOENT)) + printf("%s: needs update\n", ce->name); continue; } active_cache[i] = new; @@ -204,11 +241,11 @@ static void refresh_cache(void) /* * 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 (.dircache or anything else). They + * any other dot-files (.git or anything else). They * are hidden, for chist sake. * * Also, we don't want double slashes or slashes at the - * end that can make pathnames ambiguous. + * end that can make pathnames ambiguous. */ static int verify_path(char *path) { @@ -229,22 +266,66 @@ inside: } } +static int add_cacheinfo(char *arg1, char *arg2, char *arg3) +{ + int size, len; + 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); + return add_cache_entry(ce, allow_add); +} + +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(); +} + int main(int argc, char **argv) { int i, newfd, entries; 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); + 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) { - perror("cache corrupted"); - return -1; - } + if (entries < 0) + die("cache corrupted"); - newfd = open(".dircache/index.lock", O_RDWR | O_CREAT | O_EXCL, 0600); - if (newfd < 0) { - perror("unable to create new cachefile"); - return -1; - } for (i = 1 ; i < argc; i++) { char *path = argv[i]; @@ -265,20 +346,28 @@ int main(int argc, char **argv) refresh_cache(); continue; } - usage("unknown option %s", path); + if (!strcmp(path, "--cacheinfo")) { + if (i+3 >= argc || add_cacheinfo(argv[i+1], argv[i+2], argv[i+3])) + die("update-cache: --cacheinfo "); + i += 3; + continue; + } + if (!strcmp(path, "--ignore-missing")) { + not_new = 1; + continue; + } + die("unknown option %s", path); } if (!verify_path(path)) { fprintf(stderr, "Ignoring path %s\n", argv[i]); continue; } - if (add_file_to_cache(path)) { - fprintf(stderr, "Unable to add %s to database\n", path); - goto out; - } + if (add_file_to_cache(path)) + die("Unable to add %s to database", path); } - if (!write_cache(newfd, active_cache, active_nr) && !rename(".dircache/index.lock", ".dircache/index")) - return 0; -out: - unlink(".dircache/index.lock"); + if (write_cache(newfd, active_cache, active_nr) || rename(lockfile, indexfile)) + die("Unable to write new cachefile"); + + lockfile_name = NULL; return 0; }