diff options
Diffstat (limited to 'read-cache.c')
| -rw-r--r-- | read-cache.c | 335 |
1 files changed, 281 insertions, 54 deletions
diff --git a/read-cache.c b/read-cache.c index f83de8c415..b1475ffa09 100644 --- a/read-cache.c +++ b/read-cache.c @@ -8,6 +8,12 @@ #include "cache-tree.h" #include "refs.h" #include "dir.h" +#include "tree.h" +#include "commit.h" +#include "diff.h" +#include "diffcore.h" +#include "revision.h" +#include "blob.h" /* Index extensions. * @@ -38,6 +44,22 @@ static void replace_index_entry(struct index_state *istate, int nr, struct cache istate->cache_changed = 1; } +void rename_index_entry_at(struct index_state *istate, int nr, const char *new_name) +{ + struct cache_entry *old = istate->cache[nr], *new; + int namelen = strlen(new_name); + + new = xmalloc(cache_entry_size(namelen)); + copy_cache_entry(new, old); + new->ce_flags &= ~(CE_STATE_MASK | CE_NAMEMASK); + new->ce_flags |= (namelen >= CE_NAMEMASK ? CE_NAMEMASK : namelen); + memcpy(new->name, new_name, namelen + 1); + + cache_tree_invalidate_path(istate->cache_tree, old->name); + remove_index_entry_at(istate, nr); + add_index_entry(istate, new, ADD_CACHE_OK_TO_ADD|ADD_CACHE_OK_TO_REPLACE); +} + /* * This only updates the "non-critical" parts of the directory * cache, ie the parts that aren't tracked by GIT, and only used @@ -77,27 +99,21 @@ static int ce_compare_data(struct cache_entry *ce, struct stat *st) static int ce_compare_link(struct cache_entry *ce, size_t expected_size) { int match = -1; - char *target; void *buffer; unsigned long size; enum object_type type; - int len; + struct strbuf sb = STRBUF_INIT; - target = xmalloc(expected_size); - len = readlink(ce->name, target, expected_size); - if (len != expected_size) { - free(target); + if (strbuf_readlink(&sb, ce->name, expected_size)) return -1; - } + buffer = read_sha1_file(ce->sha1, &type, &size); - if (!buffer) { - free(target); - return -1; + if (buffer) { + if (size == sb.len) + match = memcmp(buffer, sb.buf, size); + free(buffer); } - if (size == expected_size) - match = memcmp(buffer, target, size); - free(buffer); - free(target); + strbuf_release(&sb); return match; } @@ -131,14 +147,14 @@ static int ce_modified_check_fs(struct cache_entry *ce, struct stat *st) break; case S_IFDIR: if (S_ISGITLINK(ce->ce_mode)) - return 0; + return ce_compare_gitlink(ce) ? DATA_CHANGED : 0; default: return TYPE_CHANGED; } return 0; } -static int is_empty_blob_sha1(const unsigned char *sha1) +int is_empty_blob_sha1(const unsigned char *sha1) { static const unsigned char empty_blob_sha1[20] = { 0xe6,0x9d,0xe2,0x9b,0xb2,0xd1,0xd6,0x43,0x4b,0x8b, @@ -171,6 +187,7 @@ static int ce_match_stat_basic(struct cache_entry *ce, struct stat *st) changed |= TYPE_CHANGED; break; case S_IFGITLINK: + /* We ignore most of the st_xxx fields for gitlinks */ if (!S_ISDIR(st->st_mode)) changed |= TYPE_CHANGED; else if (ce_compare_gitlink(ce)) @@ -181,7 +198,7 @@ static int ce_match_stat_basic(struct cache_entry *ce, struct stat *st) } if (ce->ce_mtime != (unsigned int) st->st_mtime) changed |= MTIME_CHANGED; - if (ce->ce_ctime != (unsigned int) st->st_ctime) + if (trust_ctime && ce->ce_ctime != (unsigned int) st->st_ctime) changed |= CTIME_CHANGED; if (ce->ce_uid != (unsigned int) st->st_uid || @@ -234,6 +251,14 @@ int ie_match_stat(const struct index_state *istate, if (!ignore_valid && (ce->ce_flags & CE_VALID)) return 0; + /* + * Intent-to-add entries have not been added, so the index entry + * by definition never matches what is in the work tree until it + * actually gets added. + */ + if (ce->ce_flags & CE_INTENT_TO_ADD) + return DATA_CHANGED | TYPE_CHANGED | MODE_CHANGED; + changed = ce_match_stat_basic(ce, st); /* @@ -277,11 +302,22 @@ int ie_modified(const struct index_state *istate, if (changed & (MODE_CHANGED | TYPE_CHANGED)) return changed; - /* Immediately after read-tree or update-index --cacheinfo, - * the length field is zero. For other cases the ce_size - * should match the SHA1 recorded in the index entry. + /* + * Immediately after read-tree or update-index --cacheinfo, + * the length field is zero, as we have never even read the + * lstat(2) information once, and we cannot trust DATA_CHANGED + * returned by ie_match_stat() which in turn was returned by + * ce_match_stat_basic() to signal that the filesize of the + * blob changed. We have to actually go to the filesystem to + * see if the contents match, and if so, should answer "unchanged". + * + * The logic does not apply to gitlinks, as ce_match_stat_basic() + * already has checked the actual HEAD from the filesystem in the + * subproject. If ie_match_stat() already said it is different, + * then we know it is. */ - if ((changed & DATA_CHANGED) && ce->ce_size != 0) + if ((changed & DATA_CHANGED) && + (S_ISGITLINK(ce->ce_mode) || ce->ce_size != 0)) return changed; changed_fs = ce_modified_check_fs(ce, st); @@ -478,6 +514,14 @@ static struct cache_entry *create_alias_ce(struct cache_entry *ce, struct cache_ return new; } +static void record_intent_to_add(struct cache_entry *ce) +{ + unsigned char sha1[20]; + if (write_sha1_file("", 0, blob_type, sha1)) + die("cannot create an empty blob in the object database"); + hashcpy(ce->sha1, sha1); +} + int add_to_index(struct index_state *istate, const char *path, struct stat *st, int flags) { int size, namelen, was_same; @@ -486,6 +530,9 @@ int add_to_index(struct index_state *istate, const char *path, struct stat *st, unsigned ce_option = CE_MATCH_IGNORE_VALID|CE_MATCH_RACY_IS_DIRTY; int verbose = flags & (ADD_CACHE_VERBOSE | ADD_CACHE_PRETEND); int pretend = flags & ADD_CACHE_PRETEND; + int intent_only = flags & ADD_CACHE_INTENT; + int add_option = (ADD_CACHE_OK_TO_ADD|ADD_CACHE_OK_TO_REPLACE| + (intent_only ? ADD_CACHE_NEW_ONLY : 0)); if (!S_ISREG(st_mode) && !S_ISLNK(st_mode) && !S_ISDIR(st_mode)) return error("%s: can only add regular files, symbolic links or git-directories", path); @@ -499,7 +546,10 @@ int add_to_index(struct index_state *istate, const char *path, struct stat *st, ce = xcalloc(1, size); memcpy(ce->name, path, namelen); ce->ce_flags = namelen; - fill_stat_cache_info(ce, st); + if (!intent_only) + fill_stat_cache_info(ce, st); + else + ce->ce_flags |= CE_INTENT_TO_ADD; if (trust_executable_bit && has_symlinks) ce->ce_mode = create_ce_mode(st_mode); @@ -522,13 +572,17 @@ int add_to_index(struct index_state *istate, const char *path, struct stat *st, alias->ce_flags |= CE_ADDED; return 0; } - if (index_path(ce->sha1, path, st, 1)) - return error("unable to index file %s", path); + if (!intent_only) { + if (index_path(ce->sha1, path, st, 1)) + return error("unable to index file %s", path); + } else + record_intent_to_add(ce); + if (ignore_case && alias && different_name(ce, alias)) ce = create_alias_ce(ce, alias); ce->ce_flags |= CE_ADDED; - /* It was suspected to be recily clean, but it turns out to be Ok */ + /* It was suspected to be racily clean, but it turns out to be Ok */ was_same = (alias && !ce_stage(alias) && !hashcmp(alias->sha1, ce->sha1) && @@ -536,7 +590,7 @@ int add_to_index(struct index_state *istate, const char *path, struct stat *st, if (pretend) ; - else if (add_index_entry(istate, ce, ADD_CACHE_OK_TO_ADD|ADD_CACHE_OK_TO_REPLACE)) + else if (add_index_entry(istate, ce, add_option)) return error("unable to add %s to index",path); if (verbose && !was_same) printf("add '%s'\n", path); @@ -558,8 +612,10 @@ struct cache_entry *make_cache_entry(unsigned int mode, int size, len; struct cache_entry *ce; - if (!verify_path(path)) + if (!verify_path(path)) { + error("Invalid path '%s'", path); return NULL; + } len = strlen(path); size = cache_entry_size(len); @@ -815,13 +871,15 @@ static int add_index_entry_with_check(struct index_state *istate, struct cache_e int ok_to_add = option & ADD_CACHE_OK_TO_ADD; int ok_to_replace = option & ADD_CACHE_OK_TO_REPLACE; int skip_df_check = option & ADD_CACHE_SKIP_DFCHECK; + int new_only = option & ADD_CACHE_NEW_ONLY; cache_tree_invalidate_path(istate->cache_tree, ce->name); pos = index_name_pos(istate, ce->name, ce->ce_flags); /* existing match? Just replace it. */ if (pos >= 0) { - replace_index_entry(istate, pos, ce); + if (!new_only) + replace_index_entry(istate, pos, ce); return 0; } pos = -pos-1; @@ -841,7 +899,7 @@ static int add_index_entry_with_check(struct index_state *istate, struct cache_e if (!ok_to_add) return -1; if (!verify_path(ce->name)) - return -1; + return error("Invalid path '%s'", ce->name); if (!skip_df_check && check_file_directory_conflict(istate, ce, pos, ok_to_replace)) { @@ -980,7 +1038,10 @@ int refresh_index(struct index_state *istate, unsigned int flags, const char **p int not_new = (flags & REFRESH_IGNORE_MISSING) != 0; int ignore_submodules = (flags & REFRESH_IGNORE_SUBMODULES) != 0; unsigned int options = really ? CE_MATCH_IGNORE_VALID : 0; + const char *needs_update_message; + needs_update_message = ((flags & REFRESH_SAY_CHANGED) + ? "locally modified" : "needs update"); for (i = 0; i < istate->cache_nr; i++) { struct cache_entry *ce, *new; int cache_errno = 0; @@ -1019,7 +1080,7 @@ int refresh_index(struct index_state *istate, unsigned int flags, const char **p } if (quiet) continue; - printf("%s: needs update\n", ce->name); + printf("%s: %s\n", ce->name, needs_update_message); has_errors = 1; continue; } @@ -1036,16 +1097,16 @@ struct cache_entry *refresh_cache_entry(struct cache_entry *ce, int really) static int verify_hdr(struct cache_header *hdr, unsigned long size) { - SHA_CTX c; + git_SHA_CTX c; unsigned char sha1[20]; if (hdr->hdr_signature != htonl(CACHE_SIGNATURE)) return error("bad signature"); - if (hdr->hdr_version != htonl(2)) + if (hdr->hdr_version != htonl(2) && hdr->hdr_version != htonl(3)) return error("bad index version"); - SHA1_Init(&c); - SHA1_Update(&c, hdr, size - 20); - SHA1_Final(sha1, &c); + git_SHA1_Init(&c); + git_SHA1_Update(&c, hdr, size - 20); + git_SHA1_Final(sha1, &c); if (hashcmp(sha1, (unsigned char *)hdr + size - 20)) return error("bad index file sha1 signature"); return 0; @@ -1076,6 +1137,7 @@ int read_index(struct index_state *istate) static void convert_from_disk(struct ondisk_cache_entry *ondisk, struct cache_entry *ce) { size_t len; + const char *name; ce->ce_ctime = ntohl(ondisk->ctime.sec); ce->ce_mtime = ntohl(ondisk->mtime.sec); @@ -1087,16 +1149,32 @@ static void convert_from_disk(struct ondisk_cache_entry *ondisk, struct cache_en ce->ce_size = ntohl(ondisk->size); /* On-disk flags are just 16 bits */ ce->ce_flags = ntohs(ondisk->flags); + hashcpy(ce->sha1, ondisk->sha1); len = ce->ce_flags & CE_NAMEMASK; + + if (ce->ce_flags & CE_EXTENDED) { + struct ondisk_cache_entry_extended *ondisk2; + int extended_flags; + ondisk2 = (struct ondisk_cache_entry_extended *)ondisk; + extended_flags = ntohs(ondisk2->flags2) << 16; + /* We do not yet understand any bit out of CE_EXTENDED_FLAGS */ + if (extended_flags & ~CE_EXTENDED_FLAGS) + die("Unknown index entry format %08x", extended_flags); + ce->ce_flags |= extended_flags; + name = ondisk2->name; + } + else + name = ondisk->name; + if (len == CE_NAMEMASK) - len = strlen(ondisk->name); + len = strlen(name); /* * NEEDSWORK: If the original index is crafted, this copy could * go unchecked. */ - memcpy(ce->name, ondisk->name, len + 1); + memcpy(ce->name, name, len + 1); } static inline size_t estimate_cache_size(size_t ondisk_size, unsigned int entries) @@ -1124,7 +1202,7 @@ int read_index_from(struct index_state *istate, const char *path) size_t mmap_size; errno = EBUSY; - if (istate->alloc) + if (istate->initialized) return istate->cache_nr; errno = ENOENT; @@ -1164,6 +1242,7 @@ int read_index_from(struct index_state *istate, const char *path) * index size */ istate->alloc = xmalloc(estimate_cache_size(mmap_size, istate->cache_nr)); + istate->initialized = 1; src_offset = sizeof(*hdr); dst_offset = 0; @@ -1207,15 +1286,22 @@ unmap: die("index file corrupt"); } +int is_index_unborn(struct index_state *istate) +{ + return (!istate->cache_nr && !istate->alloc && !istate->timestamp); +} + int discard_index(struct index_state *istate) { istate->cache_nr = 0; istate->cache_changed = 0; istate->timestamp = 0; + istate->name_hash_initialized = 0; free_hash(&istate->name_hash); cache_tree_free(&(istate->cache_tree)); free(istate->alloc); istate->alloc = NULL; + istate->initialized = 0; /* no need to throw away allocated active_cache */ return 0; @@ -1235,11 +1321,11 @@ int unmerged_index(const struct index_state *istate) static unsigned char write_buffer[WRITE_BUFFER_SIZE]; static unsigned long write_buffer_len; -static int ce_write_flush(SHA_CTX *context, int fd) +static int ce_write_flush(git_SHA_CTX *context, int fd) { unsigned int buffered = write_buffer_len; if (buffered) { - SHA1_Update(context, write_buffer, buffered); + git_SHA1_Update(context, write_buffer, buffered); if (write_in_full(fd, write_buffer, buffered) != buffered) return -1; write_buffer_len = 0; @@ -1247,7 +1333,7 @@ static int ce_write_flush(SHA_CTX *context, int fd) return 0; } -static int ce_write(SHA_CTX *context, int fd, void *data, unsigned int len) +static int ce_write(git_SHA_CTX *context, int fd, void *data, unsigned int len) { while (len) { unsigned int buffered = write_buffer_len; @@ -1269,7 +1355,7 @@ static int ce_write(SHA_CTX *context, int fd, void *data, unsigned int len) return 0; } -static int write_index_ext_header(SHA_CTX *context, int fd, +static int write_index_ext_header(git_SHA_CTX *context, int fd, unsigned int ext, unsigned int sz) { ext = htonl(ext); @@ -1278,13 +1364,13 @@ static int write_index_ext_header(SHA_CTX *context, int fd, (ce_write(context, fd, &sz, 4) < 0)) ? -1 : 0; } -static int ce_flush(SHA_CTX *context, int fd) +static int ce_flush(git_SHA_CTX *context, int fd) { unsigned int left = write_buffer_len; if (left) { write_buffer_len = 0; - SHA1_Update(context, write_buffer, left); + git_SHA1_Update(context, write_buffer, left); } /* Flush first if not enough space for SHA1 signature */ @@ -1295,7 +1381,7 @@ static int ce_flush(SHA_CTX *context, int fd) } /* Append the SHA1 signature at the end */ - SHA1_Final(write_buffer + left, context); + git_SHA1_Final(write_buffer + left, context); left += 20; return (write_in_full(fd, write_buffer, left) != left) ? -1 : 0; } @@ -1307,6 +1393,11 @@ static void ce_smudge_racily_clean_entry(struct cache_entry *ce) * falsely clean entry due to touch-update-touch race, so we leave * everything else as they are. We are called for entries whose * ce_mtime match the index file mtime. + * + * Note that this actually does not do much for gitlinks, for + * which ce_match_stat_basic() always goes to the actual + * contents. The caller checks with is_racy_timestamp() which + * always says "no" for gitlinks, so we are not called for them ;-) */ struct stat st; @@ -1344,10 +1435,11 @@ static void ce_smudge_racily_clean_entry(struct cache_entry *ce) } } -static int ce_write_entry(SHA_CTX *c, int fd, struct cache_entry *ce) +static int ce_write_entry(git_SHA_CTX *c, int fd, struct cache_entry *ce) { int size = ondisk_ce_size(ce); struct ondisk_cache_entry *ondisk = xcalloc(1, size); + char *name; ondisk->ctime.sec = htonl(ce->ce_ctime); ondisk->ctime.nsec = 0; @@ -1361,28 +1453,45 @@ static int ce_write_entry(SHA_CTX *c, int fd, struct cache_entry *ce) ondisk->size = htonl(ce->ce_size); hashcpy(ondisk->sha1, ce->sha1); ondisk->flags = htons(ce->ce_flags); - memcpy(ondisk->name, ce->name, ce_namelen(ce)); + if (ce->ce_flags & CE_EXTENDED) { + struct ondisk_cache_entry_extended *ondisk2; + ondisk2 = (struct ondisk_cache_entry_extended *)ondisk; + ondisk2->flags2 = htons((ce->ce_flags & CE_EXTENDED_FLAGS) >> 16); + name = ondisk2->name; + } + else + name = ondisk->name; + memcpy(name, ce->name, ce_namelen(ce)); return ce_write(c, fd, ondisk, size); } int write_index(const struct index_state *istate, int newfd) { - SHA_CTX c; + git_SHA_CTX c; struct cache_header hdr; - int i, err, removed; + int i, err, removed, extended; struct cache_entry **cache = istate->cache; int entries = istate->cache_nr; - for (i = removed = 0; i < entries; i++) + for (i = removed = extended = 0; i < entries; i++) { if (cache[i]->ce_flags & CE_REMOVE) removed++; + /* reduce extended entries if possible */ + cache[i]->ce_flags &= ~CE_EXTENDED; + if (cache[i]->ce_flags & CE_EXTENDED_FLAGS) { + extended++; + cache[i]->ce_flags |= CE_EXTENDED; + } + } + hdr.hdr_signature = htonl(CACHE_SIGNATURE); - hdr.hdr_version = htonl(2); + /* for extended format, increase version so older git won't try to read it */ + hdr.hdr_version = htonl(extended ? 3 : 2); hdr.hdr_entries = htonl(entries - removed); - SHA1_Init(&c); + git_SHA1_Init(&c); if (ce_write(&c, newfd, &hdr, sizeof(hdr)) < 0) return -1; @@ -1398,9 +1507,8 @@ int write_index(const struct index_state *istate, int newfd) /* Write extension data here */ if (istate->cache_tree) { - struct strbuf sb; + struct strbuf sb = STRBUF_INIT; - strbuf_init(&sb, 0); cache_tree_write(&sb, istate->cache_tree); err = write_index_ext_header(&c, newfd, CACHE_EXT_TREE, sb.len) < 0 || ce_write(&c, newfd, sb.buf, sb.len) < 0; @@ -1410,3 +1518,122 @@ int write_index(const struct index_state *istate, int newfd) } return ce_flush(&c, newfd); } + +/* + * Read the index file that is potentially unmerged into given + * index_state, dropping any unmerged entries. Returns true if + * the index is unmerged. Callers who want to refuse to work + * from an unmerged state can call this and check its return value, + * instead of calling read_cache(). + */ +int read_index_unmerged(struct index_state *istate) +{ + int i; + int unmerged = 0; + + read_index(istate); + for (i = 0; i < istate->cache_nr; i++) { + struct cache_entry *ce = istate->cache[i]; + struct cache_entry *new_ce; + int size, len; + + if (!ce_stage(ce)) + continue; + unmerged = 1; + len = strlen(ce->name); + size = cache_entry_size(len); + new_ce = xcalloc(1, size); + hashcpy(new_ce->sha1, ce->sha1); + memcpy(new_ce->name, ce->name, len); + new_ce->ce_flags = create_ce_flags(len, 0); + new_ce->ce_mode = ce->ce_mode; + if (add_index_entry(istate, new_ce, 0)) + return error("%s: cannot drop to stage #0", + ce->name); + i = index_name_pos(istate, new_ce->name, len); + } + return unmerged; +} + +struct update_callback_data +{ + int flags; + int add_errors; +}; + +static void update_callback(struct diff_queue_struct *q, + struct diff_options *opt, void *cbdata) +{ + int i; + struct update_callback_data *data = cbdata; + + for (i = 0; i < q->nr; i++) { + struct diff_filepair *p = q->queue[i]; + const char *path = p->one->path; + switch (p->status) { + default: + die("unexpected diff status %c", p->status); + case DIFF_STATUS_UNMERGED: + case DIFF_STATUS_MODIFIED: + case DIFF_STATUS_TYPE_CHANGED: + if (add_file_to_index(&the_index, path, data->flags)) { + if (!(data->flags & ADD_CACHE_IGNORE_ERRORS)) + die("updating files failed"); + data->add_errors++; + } + break; + case DIFF_STATUS_DELETED: + if (data->flags & ADD_CACHE_IGNORE_REMOVAL) + break; + if (!(data->flags & ADD_CACHE_PRETEND)) + remove_file_from_index(&the_index, path); + if (data->flags & (ADD_CACHE_PRETEND|ADD_CACHE_VERBOSE)) + printf("remove '%s'\n", path); + break; + } + } +} + +int add_files_to_cache(const char *prefix, const char **pathspec, int flags) +{ + struct update_callback_data data; + struct rev_info rev; + init_revisions(&rev, prefix); + setup_revisions(0, NULL, &rev, NULL); + rev.prune_data = pathspec; + rev.diffopt.output_format = DIFF_FORMAT_CALLBACK; + rev.diffopt.format_callback = update_callback; + data.flags = flags; + data.add_errors = 0; + rev.diffopt.format_callback_data = &data; + run_diff_files(&rev, DIFF_RACY_IS_MODIFIED); + return !!data.add_errors; +} + +/* + * Returns 1 if the path is an "other" path with respect to + * the index; that is, the path is not mentioned in the index at all, + * either as a file, a directory with some files in the index, + * or as an unmerged entry. + * + * We helpfully remove a trailing "/" from directories so that + * the output of read_directory can be used as-is. + */ +int index_name_is_other(const struct index_state *istate, const char *name, + int namelen) +{ + int pos; + if (namelen && name[namelen - 1] == '/') + namelen--; + pos = index_name_pos(istate, name, namelen); + if (0 <= pos) + return 0; /* exact match */ + pos = -pos - 1; + if (pos < istate->cache_nr) { + struct cache_entry *ce = istate->cache[pos]; + if (ce_namelen(ce) == namelen && + !memcmp(ce->name, name, namelen)) + return 0; /* Yup, this one exists unmerged */ + } + return 1; +} |