diff options
Diffstat (limited to 'read-cache.c')
| -rw-r--r-- | read-cache.c | 636 |
1 files changed, 483 insertions, 153 deletions
diff --git a/read-cache.c b/read-cache.c index c3692f41ad..9033dd3ab9 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. * @@ -23,78 +29,35 @@ struct index_state the_index; -static unsigned int hash_name(const char *name, int namelen) -{ - unsigned int hash = 0x123; - - do { - unsigned char c = *name++; - hash = hash*101 + c; - } while (--namelen); - return hash; -} - -static void hash_index_entry(struct index_state *istate, struct cache_entry *ce) -{ - void **pos; - unsigned int hash; - - if (ce->ce_flags & CE_HASHED) - return; - ce->ce_flags |= CE_HASHED; - ce->next = NULL; - hash = hash_name(ce->name, ce_namelen(ce)); - pos = insert_hash(hash, ce, &istate->name_hash); - if (pos) { - ce->next = *pos; - *pos = ce; - } -} - -static void lazy_init_name_hash(struct index_state *istate) -{ - int nr; - - if (istate->name_hash_initialized) - return; - for (nr = 0; nr < istate->cache_nr; nr++) - hash_index_entry(istate, istate->cache[nr]); - istate->name_hash_initialized = 1; -} - static void set_index_entry(struct index_state *istate, int nr, struct cache_entry *ce) { - ce->ce_flags &= ~CE_UNHASHED; istate->cache[nr] = ce; - if (istate->name_hash_initialized) - hash_index_entry(istate, ce); + add_name_hash(istate, ce); } static void replace_index_entry(struct index_state *istate, int nr, struct cache_entry *ce) { struct cache_entry *old = istate->cache[nr]; - remove_index_entry(old); + remove_name_hash(old); set_index_entry(istate, nr, ce); istate->cache_changed = 1; } -int index_name_exists(struct index_state *istate, const char *name, int namelen) +void rename_index_entry_at(struct index_state *istate, int nr, const char *new_name) { - unsigned int hash = hash_name(name, namelen); - struct cache_entry *ce; - - lazy_init_name_hash(istate); - ce = lookup_hash(hash, &istate->name_hash); - - while (ce) { - if (!(ce->ce_flags & CE_UNHASHED)) { - if (!cache_name_compare(name, namelen, ce->name, ce->ce_flags)) - return 1; - } - ce = ce->next; - } - return 0; + 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); } /* @@ -104,8 +67,10 @@ int index_name_exists(struct index_state *istate, const char *name, int namelen) */ void fill_stat_cache_info(struct cache_entry *ce, struct stat *st) { - ce->ce_ctime = st->st_ctime; - ce->ce_mtime = st->st_mtime; + ce->ce_ctime.sec = (unsigned int)st->st_ctime; + ce->ce_mtime.sec = (unsigned int)st->st_mtime; + ce->ce_ctime.nsec = ST_CTIME_NSEC(*st); + ce->ce_mtime.nsec = ST_MTIME_NSEC(*st); ce->ce_dev = st->st_dev; ce->ce_ino = st->st_ino; ce->ce_uid = st->st_uid; @@ -136,27 +101,21 @@ 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; } @@ -190,13 +149,23 @@ 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; } +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, + 0x29,0xae,0x77,0x5a,0xd8,0xc2,0xe4,0x8c,0x53,0x91 + }; + + return !hashcmp(sha1, empty_blob_sha1); +} + static int ce_match_stat_basic(struct cache_entry *ce, struct stat *st) { unsigned int changed = 0; @@ -220,6 +189,7 @@ 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)) @@ -228,11 +198,18 @@ static int ce_match_stat_basic(struct cache_entry *ce, struct stat *st) default: die("internal error: ce_mode is %o", ce->ce_mode); } - if (ce->ce_mtime != (unsigned int) st->st_mtime) + if (ce->ce_mtime.sec != (unsigned int)st->st_mtime) changed |= MTIME_CHANGED; - if (ce->ce_ctime != (unsigned int) st->st_ctime) + if (trust_ctime && ce->ce_ctime.sec != (unsigned int)st->st_ctime) changed |= CTIME_CHANGED; +#ifdef USE_NSEC + if (ce->ce_mtime.nsec != ST_MTIME_NSEC(*st)) + changed |= MTIME_CHANGED; + if (trust_ctime && ce->ce_ctime.nsec != ST_CTIME_NSEC(*st)) + changed |= CTIME_CHANGED; +#endif + if (ce->ce_uid != (unsigned int) st->st_uid || ce->ce_gid != (unsigned int) st->st_gid) changed |= OWNER_CHANGED; @@ -252,13 +229,28 @@ static int ce_match_stat_basic(struct cache_entry *ce, struct stat *st) if (ce->ce_size != (unsigned int) st->st_size) changed |= DATA_CHANGED; + /* Racily smudged entry? */ + if (!ce->ce_size) { + if (!is_empty_blob_sha1(ce->sha1)) + changed |= DATA_CHANGED; + } + return changed; } static int is_racy_timestamp(const struct index_state *istate, struct cache_entry *ce) { - return (istate->timestamp && - ((unsigned int)istate->timestamp) <= ce->ce_mtime); + return (!S_ISGITLINK(ce->ce_mode) && + istate->timestamp.sec && +#ifdef USE_NSEC + /* nanosecond timestamped files can also be racy! */ + (istate->timestamp.sec < ce->ce_mtime.sec || + (istate->timestamp.sec == ce->ce_mtime.sec && + istate->timestamp.nsec <= ce->ce_mtime.nsec)) +#else + istate->timestamp.sec <= ce->ce_mtime.sec +#endif + ); } int ie_match_stat(const struct index_state *istate, @@ -276,6 +268,14 @@ 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); /* @@ -319,11 +319,22 @@ 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); @@ -438,7 +449,7 @@ int remove_index_entry_at(struct index_state *istate, int pos) { struct cache_entry *ce = istate->cache[pos]; - remove_index_entry(ce); + remove_name_hash(ce); istate->cache_changed = 1; istate->cache_nr--; if (pos >= istate->cache_nr) @@ -449,6 +460,26 @@ int remove_index_entry_at(struct index_state *istate, int pos) return 1; } +/* + * Remove all cache ententries marked for removal, that is where + * CE_REMOVE is set in ce_flags. This is much more effective than + * calling remove_index_entry_at() for each entry to be removed. + */ +void remove_marked_cache_entries(struct index_state *istate) +{ + struct cache_entry **ce_array = istate->cache; + unsigned int i, j; + + for (i = j = 0; i < istate->cache_nr; i++) { + if (ce_array[i]->ce_flags & CE_REMOVE) + remove_name_hash(ce_array[i]); + else + ce_array[j++] = ce_array[i]; + } + istate->cache_changed = 1; + istate->cache_nr = j; +} + int remove_file_from_index(struct index_state *istate, const char *path) { int pos = index_name_pos(istate, path, strlen(path)); @@ -488,21 +519,63 @@ static int index_name_pos_also_unmerged(struct index_state *istate, return pos; } -int add_file_to_index(struct index_state *istate, const char *path, int verbose) +static int different_name(struct cache_entry *ce, struct cache_entry *alias) { - int size, namelen, pos; - struct stat st; - struct cache_entry *ce; - unsigned ce_option = CE_MATCH_IGNORE_VALID|CE_MATCH_RACY_IS_DIRTY; + int len = ce_namelen(ce); + return ce_namelen(alias) != len || memcmp(ce->name, alias->name, len); +} - if (lstat(path, &st)) - die("%s: unable to stat (%s)", path, strerror(errno)); +/* + * If we add a filename that aliases in the cache, we will use the + * name that we already have - but we don't want to update the same + * alias twice, because that implies that there were actually two + * different files with aliasing names! + * + * So we use the CE_ADDED flag to verify that the alias was an old + * one before we accept it as + */ +static struct cache_entry *create_alias_ce(struct cache_entry *ce, struct cache_entry *alias) +{ + int len; + struct cache_entry *new; + + if (alias->ce_flags & CE_ADDED) + die("Will not add file alias '%s' ('%s' already exists in index)", ce->name, alias->name); + + /* Ok, create the new entry using the name of the existing alias */ + len = ce_namelen(alias); + new = xcalloc(1, cache_entry_size(len)); + memcpy(new->name, alias->name, len); + copy_cache_entry(new, ce); + free(ce); + 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); +} - if (!S_ISREG(st.st_mode) && !S_ISLNK(st.st_mode) && !S_ISDIR(st.st_mode)) - die("%s: can only add regular files, symbolic links or git-directories", path); +int add_to_index(struct index_state *istate, const char *path, struct stat *st, int flags) +{ + int size, namelen, was_same; + mode_t st_mode = st->st_mode; + struct cache_entry *ce, *alias; + 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); namelen = strlen(path); - if (S_ISDIR(st.st_mode)) { + if (S_ISDIR(st_mode)) { while (namelen && path[namelen-1] == '/') namelen--; } @@ -510,10 +583,13 @@ int add_file_to_index(struct index_state *istate, const char *path, int verbose) 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.st_mode); + ce->ce_mode = create_ce_mode(st_mode); else { /* If there is an existing entry, pick the mode bits and type * from it, otherwise assume unexecutable regular file. @@ -522,28 +598,50 @@ int add_file_to_index(struct index_state *istate, const char *path, int verbose) int pos = index_name_pos_also_unmerged(istate, path, namelen); ent = (0 <= pos) ? istate->cache[pos] : NULL; - ce->ce_mode = ce_mode_from_stat(ent, st.st_mode); + ce->ce_mode = ce_mode_from_stat(ent, st_mode); } - pos = index_name_pos(istate, ce->name, namelen); - if (0 <= pos && - !ce_stage(istate->cache[pos]) && - !ie_match_stat(istate, istate->cache[pos], &st, ce_option)) { + alias = index_name_exists(istate, ce->name, ce_namelen(ce), ignore_case); + if (alias && !ce_stage(alias) && !ie_match_stat(istate, alias, st, ce_option)) { /* Nothing changed, really */ free(ce); - ce_mark_uptodate(istate->cache[pos]); + ce_mark_uptodate(alias); + alias->ce_flags |= CE_ADDED; return 0; } - - if (index_path(ce->sha1, path, &st, 1)) - die("unable to index file %s", path); - if (add_index_entry(istate, ce, ADD_CACHE_OK_TO_ADD|ADD_CACHE_OK_TO_REPLACE)) - die("unable to add %s to index",path); - if (verbose) + 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 racily clean, but it turns out to be Ok */ + was_same = (alias && + !ce_stage(alias) && + !hashcmp(alias->sha1, ce->sha1) && + ce->ce_mode == alias->ce_mode); + + if (pretend) + ; + 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); return 0; } +int add_file_to_index(struct index_state *istate, const char *path, int flags) +{ + struct stat st; + if (lstat(path, &st)) + die_errno("unable to stat '%s'", path); + return add_to_index(istate, path, &st, flags); +} + struct cache_entry *make_cache_entry(unsigned int mode, const unsigned char *sha1, const char *path, int stage, int refresh) @@ -551,8 +649,10 @@ 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); @@ -808,13 +908,15 @@ 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; @@ -834,7 +936,7 @@ 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)) { @@ -902,6 +1004,15 @@ static struct cache_entry *refresh_cache_ent(struct index_state *istate, if (ce_uptodate(ce)) return ce; + /* + * CE_VALID means the user promised us that the change to + * the work tree does not matter and told us not to worry. + */ + if (!ignore_valid && (ce->ce_flags & CE_VALID)) { + ce_mark_uptodate(ce); + return ce; + } + if (lstat(ce->name, &st) < 0) { if (err) *err = errno; @@ -954,7 +1065,18 @@ static struct cache_entry *refresh_cache_ent(struct index_state *istate, return updated; } -int refresh_index(struct index_state *istate, unsigned int flags, const char **pathspec, char *seen) +static void show_file(const char * fmt, const char * name, int in_porcelain, + int * first, char *header_msg) +{ + if (in_porcelain && *first && header_msg) { + printf("%s\n", header_msg); + *first=0; + } + printf(fmt, name); +} + +int refresh_index(struct index_state *istate, unsigned int flags, const char **pathspec, + char *seen, char *header_msg) { int i; int has_errors = 0; @@ -962,13 +1084,23 @@ int refresh_index(struct index_state *istate, unsigned int flags, const char **p int allow_unmerged = (flags & REFRESH_UNMERGED) != 0; int quiet = (flags & REFRESH_QUIET) != 0; int not_new = (flags & REFRESH_IGNORE_MISSING) != 0; + int ignore_submodules = (flags & REFRESH_IGNORE_SUBMODULES) != 0; + int first = 1; + int in_porcelain = (flags & REFRESH_IN_PORCELAIN); unsigned int options = really ? CE_MATCH_IGNORE_VALID : 0; + const char *needs_update_fmt; + const char *needs_merge_fmt; + needs_update_fmt = (in_porcelain ? "M\t%s\n" : "%s: needs update\n"); + needs_merge_fmt = (in_porcelain ? "U\t%s\n" : "%s: needs merge\n"); for (i = 0; i < istate->cache_nr; i++) { struct cache_entry *ce, *new; int cache_errno = 0; ce = istate->cache[i]; + if (ignore_submodules && S_ISGITLINK(ce->ce_mode)) + continue; + if (ce_stage(ce)) { while ((i < istate->cache_nr) && ! strcmp(istate->cache[i]->name, ce->name)) @@ -976,7 +1108,7 @@ int refresh_index(struct index_state *istate, unsigned int flags, const char **p i--; if (allow_unmerged) continue; - printf("%s: needs merge\n", ce->name); + show_file(needs_merge_fmt, ce->name, in_porcelain, &first, header_msg); has_errors = 1; continue; } @@ -999,7 +1131,7 @@ int refresh_index(struct index_state *istate, unsigned int flags, const char **p } if (quiet) continue; - printf("%s: needs update\n", ce->name); + show_file(needs_update_fmt, ce->name, in_porcelain, &first, header_msg); has_errors = 1; continue; } @@ -1016,16 +1148,16 @@ 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; @@ -1056,9 +1188,12 @@ 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); + ce->ce_ctime.sec = ntohl(ondisk->ctime.sec); + ce->ce_mtime.sec = ntohl(ondisk->mtime.sec); + ce->ce_ctime.nsec = ntohl(ondisk->ctime.nsec); + ce->ce_mtime.nsec = ntohl(ondisk->mtime.nsec); ce->ce_dev = ntohl(ondisk->dev); ce->ce_ino = ntohl(ondisk->ino); ce->ce_mode = ntohl(ondisk->mode); @@ -1067,16 +1202,32 @@ 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) @@ -1104,20 +1255,21 @@ 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; - istate->timestamp = 0; + istate->timestamp.sec = 0; + istate->timestamp.nsec = 0; fd = open(path, O_RDONLY); if (fd < 0) { if (errno == ENOENT) return 0; - die("index file open failed (%s)", strerror(errno)); + die_errno("index file open failed"); } if (fstat(fd, &st)) - die("cannot stat the open index (%s)", strerror(errno)); + die_errno("cannot stat the open index"); errno = EINVAL; mmap_size = xsize_t(st.st_size); @@ -1127,7 +1279,7 @@ int read_index_from(struct index_state *istate, const char *path) mmap = xmmap(NULL, mmap_size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0); close(fd); if (mmap == MAP_FAILED) - die("unable to map index file"); + die_errno("unable to map index file"); hdr = mmap; if (verify_hdr(hdr, mmap_size) < 0) @@ -1144,6 +1296,7 @@ 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; @@ -1159,7 +1312,9 @@ int read_index_from(struct index_state *istate, const char *path) src_offset += ondisk_ce_size(ce); dst_offset += ce_size(ce); } - istate->timestamp = st.st_mtime; + istate->timestamp.sec = st.st_mtime; + istate->timestamp.nsec = ST_MTIME_NSEC(st); + while (src_offset <= mmap_size - 20 - 8) { /* After an array of active_nr index entries, * there can be arbitrary number of extended @@ -1167,7 +1322,7 @@ int read_index_from(struct index_state *istate, const char *path) * extension name (4-byte) and section length * in 4-byte network byte order. */ - unsigned long extsize; + uint32_t extsize; memcpy(&extsize, (char *)mmap + src_offset + 4, 4); extsize = ntohl(extsize); if (read_index_extension(istate, @@ -1187,15 +1342,23 @@ unmap: die("index file corrupt"); } +int is_index_unborn(struct index_state *istate) +{ + return (!istate->cache_nr && !istate->alloc && !istate->timestamp.sec); +} + int discard_index(struct index_state *istate) { istate->cache_nr = 0; istate->cache_changed = 0; - istate->timestamp = 0; + istate->timestamp.sec = 0; + istate->timestamp.nsec = 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; @@ -1215,11 +1378,11 @@ 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; @@ -1227,7 +1390,7 @@ 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; @@ -1249,7 +1412,7 @@ 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); @@ -1258,13 +1421,13 @@ 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 */ @@ -1275,7 +1438,7 @@ 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; } @@ -1287,6 +1450,11 @@ 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; @@ -1324,15 +1492,16 @@ 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; - ondisk->mtime.sec = htonl(ce->ce_mtime); - ondisk->mtime.nsec = 0; + ondisk->ctime.sec = htonl(ce->ce_ctime.sec); + ondisk->mtime.sec = htonl(ce->ce_mtime.sec); + ondisk->ctime.nsec = htonl(ce->ce_ctime.nsec); + ondisk->mtime.nsec = htonl(ce->ce_mtime.nsec); ondisk->dev = htonl(ce->ce_dev); ondisk->ino = htonl(ce->ce_ino); ondisk->mode = htonl(ce->ce_mode); @@ -1341,28 +1510,46 @@ 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) +int write_index(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; + struct stat st; - 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; @@ -1378,9 +1565,8 @@ 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; @@ -1388,5 +1574,149 @@ int write_index(const struct index_state *istate, int newfd) if (err) return -1; } - return ce_flush(&c, newfd); + + if (ce_flush(&c, newfd) || fstat(newfd, &st)) + return -1; + istate->timestamp.sec = (unsigned int)st.st_mtime; + istate->timestamp.nsec = ST_MTIME_NSEC(st); + return 0; +} + +/* + * 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: + /* + * ADD_CACHE_IGNORE_REMOVAL is unset if "git + * add -u" is calling us, In such a case, a + * missing work tree file needs to be removed + * if there is an unmerged entry at stage #2, + * but such a diff record is followed by + * another with DIFF_STATUS_DELETED (and if + * there is no stage #2, we won't see DELETED + * nor MODIFIED). We can simply continue + * either way. + */ + if (!(data->flags & ADD_CACHE_IGNORE_REMOVAL)) + continue; + /* + * Otherwise, it is "git add path" is asking + * to explicitly add it; we fall through. A + * missing work tree file is an error and is + * caught by add_file_to_index() in such a + * case. + */ + 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; } |