Makefile: silence perl/PM.stamp recipe
[gitweb.git] / read-cache.c
index 36a6f73fedc2fdb7c5dc2e1fb73ca5c5c76979c0..9cff715d6b669ecf05f861bc553b61d20d04191d 100644 (file)
@@ -5,6 +5,7 @@
  */
 #define NO_THE_INDEX_COMPATIBILITY_MACROS
 #include "cache.h"
+#include "lockfile.h"
 #include "cache-tree.h"
 #include "refs.h"
 #include "dir.h"
@@ -14,6 +15,8 @@
 #include "resolve-undo.h"
 #include "strbuf.h"
 #include "varint.h"
+#include "split-index.h"
+#include "sigchain.h"
 #include "utf8.h"
 
 static struct cache_entry *refresh_cache_entry(struct cache_entry *ce,
@@ -35,8 +38,15 @@ static struct cache_entry *refresh_cache_entry(struct cache_entry *ce,
 #define CACHE_EXT(s) ( (s[0]<<24)|(s[1]<<16)|(s[2]<<8)|(s[3]) )
 #define CACHE_EXT_TREE 0x54524545      /* "TREE" */
 #define CACHE_EXT_RESOLVE_UNDO 0x52455543 /* "REUC" */
+#define CACHE_EXT_LINK 0x6c696e6b        /* "link" */
+
+/* changes that can be kept in $GIT_DIR/index (basically all extensions) */
+#define EXTMASK (RESOLVE_UNDO_CHANGED | CACHE_TREE_CHANGED | \
+                CE_ENTRY_ADDED | CE_ENTRY_REMOVED | CE_ENTRY_CHANGED | \
+                SPLIT_INDEX_ORDERED)
 
 struct index_state the_index;
+static const char *alternate_index_output;
 
 static void set_index_entry(struct index_state *istate, int nr, struct cache_entry *ce)
 {
@@ -48,10 +58,12 @@ static void replace_index_entry(struct index_state *istate, int nr, struct cache
 {
        struct cache_entry *old = istate->cache[nr];
 
+       replace_index_entry_in_base(istate, old, ce);
        remove_name_hash(istate, old);
        free(old);
        set_index_entry(istate, nr, ce);
-       istate->cache_changed = 1;
+       ce->ce_flags |= CE_UPDATE_IN_BASE;
+       istate->cache_changed |= CE_ENTRY_CHANGED;
 }
 
 void rename_index_entry_at(struct index_state *istate, int nr, const char *new_name)
@@ -63,9 +75,10 @@ void rename_index_entry_at(struct index_state *istate, int nr, const char *new_n
        copy_cache_entry(new, old);
        new->ce_flags &= ~CE_HASHED;
        new->ce_namelen = namelen;
+       new->index = 0;
        memcpy(new->name, new_name, namelen + 1);
 
-       cache_tree_invalidate_path(istate->cache_tree, old->name);
+       cache_tree_invalidate_path(istate, old->name);
        remove_index_entry_at(istate, nr);
        add_index_entry(istate, new, ADD_CACHE_OK_TO_ADD|ADD_CACHE_OK_TO_REPLACE);
 }
@@ -423,18 +436,26 @@ int df_name_compare(const char *name1, int len1, int mode1,
        return c1 - c2;
 }
 
-int cache_name_stage_compare(const char *name1, int len1, int stage1, const char *name2, int len2, int stage2)
+int name_compare(const char *name1, size_t len1, const char *name2, size_t len2)
 {
-       int len = len1 < len2 ? len1 : len2;
-       int cmp;
-
-       cmp = memcmp(name1, name2, len);
+       size_t min_len = (len1 < len2) ? len1 : len2;
+       int cmp = memcmp(name1, name2, min_len);
        if (cmp)
                return cmp;
        if (len1 < len2)
                return -1;
        if (len1 > len2)
                return 1;
+       return 0;
+}
+
+int cache_name_stage_compare(const char *name1, int len1, int stage1, const char *name2, int len2, int stage2)
+{
+       int cmp;
+
+       cmp = name_compare(name1, len1, name2, len2);
+       if (cmp)
+               return cmp;
 
        if (stage1 < stage2)
                return -1;
@@ -443,11 +464,6 @@ int cache_name_stage_compare(const char *name1, int len1, int stage1, const char
        return 0;
 }
 
-int cache_name_compare(const char *name1, int len1, const char *name2, int len2)
-{
-       return cache_name_stage_compare(name1, len1, 0, name2, len2, 0);
-}
-
 static int index_name_stage_pos(const struct index_state *istate, const char *name, int namelen, int stage)
 {
        int first, last;
@@ -481,8 +497,8 @@ int remove_index_entry_at(struct index_state *istate, int pos)
 
        record_resolve_undo(istate, ce);
        remove_name_hash(istate, ce);
-       free(ce);
-       istate->cache_changed = 1;
+       save_or_free_index_entry(istate, ce);
+       istate->cache_changed |= CE_ENTRY_REMOVED;
        istate->cache_nr--;
        if (pos >= istate->cache_nr)
                return 0;
@@ -505,12 +521,14 @@ void remove_marked_cache_entries(struct index_state *istate)
        for (i = j = 0; i < istate->cache_nr; i++) {
                if (ce_array[i]->ce_flags & CE_REMOVE) {
                        remove_name_hash(istate, ce_array[i]);
-                       free(ce_array[i]);
+                       save_or_free_index_entry(istate, ce_array[i]);
                }
                else
                        ce_array[j++] = ce_array[i];
        }
-       istate->cache_changed = 1;
+       if (j == istate->cache_nr)
+               return;
+       istate->cache_changed |= CE_ENTRY_REMOVED;
        istate->cache_nr = j;
 }
 
@@ -519,7 +537,7 @@ int remove_file_from_index(struct index_state *istate, const char *path)
        int pos = index_name_pos(istate, path, strlen(path));
        if (pos < 0)
                pos = -pos-1;
-       cache_tree_invalidate_path(istate->cache_tree, path);
+       cache_tree_invalidate_path(istate, path);
        while (pos < istate->cache_nr && !strcmp(istate->cache[pos]->name, path))
                remove_index_entry_at(istate, pos);
        return 0;
@@ -568,7 +586,9 @@ static int different_name(struct cache_entry *ce, struct cache_entry *alias)
  * 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)
+static struct cache_entry *create_alias_ce(struct index_state *istate,
+                                          struct cache_entry *ce,
+                                          struct cache_entry *alias)
 {
        int len;
        struct cache_entry *new;
@@ -581,7 +601,7 @@ static struct cache_entry *create_alias_ce(struct cache_entry *ce, struct cache_
        new = xcalloc(1, cache_entry_size(len));
        memcpy(new->name, alias->name, len);
        copy_cache_entry(new, ce);
-       free(ce);
+       save_or_free_index_entry(istate, ce);
        return new;
 }
 
@@ -674,7 +694,7 @@ int add_to_index(struct index_state *istate, const char *path, struct stat *st,
                set_object_name_for_intent_to_add_entry(ce);
 
        if (ignore_case && alias && different_name(ce, alias))
-               ce = create_alias_ce(ce, alias);
+               ce = create_alias_ce(istate, ce, alias);
        ce->ce_flags |= CE_ADDED;
 
        /* It was suspected to be racily clean, but it turns out to be Ok */
@@ -942,7 +962,8 @@ static int add_index_entry_with_check(struct index_state *istate, struct cache_e
        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);
+       if (!(option & ADD_CACHE_KEEP_CACHE_TREE))
+               cache_tree_invalidate_path(istate, ce->name);
        pos = index_name_stage_pos(istate, ce->name, ce_namelen(ce), ce_stage(ce));
 
        /* existing match? Just replace it. */
@@ -1005,7 +1026,7 @@ int add_index_entry(struct index_state *istate, struct cache_entry *ce, int opti
                        istate->cache + pos,
                        (istate->cache_nr - pos - 1) * sizeof(ce));
        set_index_entry(istate, pos, ce);
-       istate->cache_changed = 1;
+       istate->cache_changed |= CE_ENTRY_ADDED;
        return 0;
 }
 
@@ -1050,6 +1071,14 @@ static struct cache_entry *refresh_cache_ent(struct index_state *istate,
                return ce;
        }
 
+       if (has_symlink_leading_path(ce->name, ce_namelen(ce))) {
+               if (ignore_missing)
+                       return ce;
+               if (err)
+                       *err = ENOENT;
+               return NULL;
+       }
+
        if (lstat(ce->name, &st) < 0) {
                if (ignore_missing && errno == ENOENT)
                        return ce;
@@ -1104,6 +1133,7 @@ static struct cache_entry *refresh_cache_ent(struct index_state *istate,
            !(ce->ce_flags & CE_VALID))
                updated->ce_flags &= ~CE_VALID;
 
+       /* istate->cache_changed is updated in the caller */
        return updated;
 }
 
@@ -1185,7 +1215,8 @@ int refresh_index(struct index_state *istate, unsigned int flags,
                                 * means the index is not valid anymore.
                                 */
                                ce->ce_flags &= ~CE_VALID;
-                               istate->cache_changed = 1;
+                               ce->ce_flags |= CE_UPDATE_IN_BASE;
+                               istate->cache_changed |= CE_ENTRY_CHANGED;
                        }
                        if (quiet)
                                continue;
@@ -1222,24 +1253,16 @@ static struct cache_entry *refresh_cache_entry(struct cache_entry *ce,
 
 #define INDEX_FORMAT_DEFAULT 3
 
-static int index_format_config(const char *var, const char *value, void *cb)
-{
-       unsigned int *version = cb;
-       if (!strcmp(var, "index.version")) {
-               *version = git_config_int(var, value);
-               return 0;
-       }
-       return 1;
-}
-
 static unsigned int get_index_format_default(void)
 {
        char *envversion = getenv("GIT_INDEX_VERSION");
        char *endp;
+       int value;
        unsigned int version = INDEX_FORMAT_DEFAULT;
 
        if (!envversion) {
-               git_config(index_format_config, &version);
+               if (!git_config_get_int("index.version", &value))
+                       version = value;
                if (version < INDEX_FORMAT_LB || INDEX_FORMAT_UB < version) {
                        warning(_("index.version set, but the value is invalid.\n"
                                  "Using version %i"), INDEX_FORMAT_DEFAULT);
@@ -1337,6 +1360,10 @@ static int read_index_extension(struct index_state *istate,
        case CACHE_EXT_RESOLVE_UNDO:
                istate->resolve_undo = resolve_undo_read(data, sz);
                break;
+       case CACHE_EXT_LINK:
+               if (read_link_extension(istate, data, sz))
+                       return -1;
+               break;
        default:
                if (*ext < 'A' || 'Z' < *ext)
                        return error("index uses %.4s extension, which we do not understand",
@@ -1347,6 +1374,14 @@ static int read_index_extension(struct index_state *istate,
        return 0;
 }
 
+int hold_locked_index(struct lock_file *lk, int die_on_error)
+{
+       return hold_lock_file_for_update(lk, get_index_file(),
+                                        die_on_error
+                                        ? LOCK_DIE_ON_ERROR
+                                        : 0);
+}
+
 int read_index(struct index_state *istate)
 {
        return read_index_from(istate, get_index_file());
@@ -1371,6 +1406,7 @@ static struct cache_entry *cache_entry_from_ondisk(struct ondisk_cache_entry *on
        ce->ce_stat_data.sd_size  = get_be32(&ondisk->size);
        ce->ce_flags = flags & ~CE_NAMEMASK;
        ce->ce_namelen = len;
+       ce->index = 0;
        hashcpy(ce->sha1, ondisk->sha1);
        memcpy(ce->name, name, len);
        ce->name[len] = '\0';
@@ -1444,8 +1480,23 @@ static struct cache_entry *create_from_disk(struct ondisk_cache_entry *ondisk,
        return ce;
 }
 
+static void check_ce_order(struct cache_entry *ce, struct cache_entry *next_ce)
+{
+       int name_compare = strcmp(ce->name, next_ce->name);
+       if (0 < name_compare)
+               die("unordered stage entries in index");
+       if (!name_compare) {
+               if (!ce_stage(ce))
+                       die("multiple stage entries for merged file '%s'",
+                               ce->name);
+               if (ce_stage(ce) > ce_stage(next_ce))
+                       die("unordered stage entries for '%s'",
+                               ce->name);
+       }
+}
+
 /* remember to discard_cache() before reading a different cache! */
-int read_index_from(struct index_state *istate, const char *path)
+int do_read_index(struct index_state *istate, const char *path, int must_exist)
 {
        int fd, i;
        struct stat st;
@@ -1462,9 +1513,9 @@ int read_index_from(struct index_state *istate, const char *path)
        istate->timestamp.nsec = 0;
        fd = open(path, O_RDONLY);
        if (fd < 0) {
-               if (errno == ENOENT)
+               if (!must_exist && errno == ENOENT)
                        return 0;
-               die_errno("index file open failed");
+               die_errno("%s: index file open failed", path);
        }
 
        if (fstat(fd, &st))
@@ -1483,7 +1534,7 @@ int read_index_from(struct index_state *istate, const char *path)
        if (verify_hdr(hdr, mmap_size) < 0)
                goto unmap;
 
-       hashcpy(istate->sha1, (unsigned char *)hdr + mmap_size - 20);
+       hashcpy(istate->sha1, (const unsigned char *)hdr + mmap_size - 20);
        istate->version = ntohl(hdr->hdr_version);
        istate->cache_nr = ntohl(hdr->hdr_entries);
        istate->cache_alloc = alloc_nr(istate->cache_nr);
@@ -1505,6 +1556,9 @@ int read_index_from(struct index_state *istate, const char *path)
                ce = create_from_disk(disk_ce, &consumed, previous_name);
                set_index_entry(istate, i, ce);
 
+               if (i > 0)
+                       check_ce_order(istate->cache[i - 1], ce);
+
                src_offset += consumed;
        }
        strbuf_release(&previous_name_buf);
@@ -1537,6 +1591,40 @@ int read_index_from(struct index_state *istate, const char *path)
        die("index file corrupt");
 }
 
+int read_index_from(struct index_state *istate, const char *path)
+{
+       struct split_index *split_index;
+       int ret;
+
+       /* istate->initialized covers both .git/index and .git/sharedindex.xxx */
+       if (istate->initialized)
+               return istate->cache_nr;
+
+       ret = do_read_index(istate, path, 0);
+       split_index = istate->split_index;
+       if (!split_index)
+               return ret;
+
+       if (is_null_sha1(split_index->base_sha1))
+               return ret;
+
+       if (split_index->base)
+               discard_index(split_index->base);
+       else
+               split_index->base = xcalloc(1, sizeof(*split_index->base));
+       ret = do_read_index(split_index->base,
+                           git_path("sharedindex.%s",
+                                    sha1_to_hex(split_index->base_sha1)), 1);
+       if (hashcmp(split_index->base_sha1, split_index->base->sha1))
+               die("broken index, expect %s in %s, got %s",
+                   sha1_to_hex(split_index->base_sha1),
+                   git_path("sharedindex.%s",
+                                    sha1_to_hex(split_index->base_sha1)),
+                   sha1_to_hex(split_index->base->sha1));
+       merge_base_index(istate);
+       return ret;
+}
+
 int is_index_unborn(struct index_state *istate)
 {
        return (!istate->cache_nr && !istate->timestamp.sec);
@@ -1546,8 +1634,15 @@ int discard_index(struct index_state *istate)
 {
        int i;
 
-       for (i = 0; i < istate->cache_nr; i++)
+       for (i = 0; i < istate->cache_nr; i++) {
+               if (istate->cache[i]->index &&
+                   istate->split_index &&
+                   istate->split_index->base &&
+                   istate->cache[i]->index <= istate->split_index->base->cache_nr &&
+                   istate->cache[i] == istate->split_index->base->cache[istate->cache[i]->index - 1])
+                       continue;
                free(istate->cache[i]);
+       }
        resolve_undo_clear_index(istate);
        istate->cache_nr = 0;
        istate->cache_changed = 0;
@@ -1559,6 +1654,7 @@ int discard_index(struct index_state *istate)
        free(istate->cache);
        istate->cache = NULL;
        istate->cache_alloc = 0;
+       discard_split_index(istate);
        return 0;
 }
 
@@ -1619,7 +1715,7 @@ static int write_index_ext_header(git_SHA_CTX *context, int fd,
                (ce_write(context, fd, &sz, 4) < 0)) ? -1 : 0;
 }
 
-static int ce_flush(git_SHA_CTX *context, int fd)
+static int ce_flush(git_SHA_CTX *context, int fd, unsigned char *sha1)
 {
        unsigned int left = write_buffer_len;
 
@@ -1637,6 +1733,7 @@ static int ce_flush(git_SHA_CTX *context, int fd)
 
        /* Append the SHA1 signature at the end */
        git_SHA1_Final(write_buffer + left, context);
+       hashcpy(sha1, write_buffer + left);
        left += 20;
        return (write_in_full(fd, write_buffer, left) != left) ? -1 : 0;
 }
@@ -1708,7 +1805,7 @@ static char *copy_cache_entry_to_ondisk(struct ondisk_cache_entry *ondisk,
        ondisk->size = htonl(ce->ce_stat_data.sd_size);
        hashcpy(ondisk->sha1, ce->sha1);
 
-       flags = ce->ce_flags;
+       flags = ce->ce_flags & ~CE_NAMEMASK;
        flags |= (ce_namelen(ce) >= CE_NAMEMASK ? CE_NAMEMASK : ce_namelen(ce));
        ondisk->flags = htons(flags);
        if (ce->ce_flags & CE_EXTENDED) {
@@ -1727,9 +1824,15 @@ static int ce_write_entry(git_SHA_CTX *c, int fd, struct cache_entry *ce,
 {
        int size;
        struct ondisk_cache_entry *ondisk;
+       int saved_namelen = saved_namelen; /* compiler workaround */
        char *name;
        int result;
 
+       if (ce->ce_flags & CE_STRIP_NAME) {
+               saved_namelen = ce_namelen(ce);
+               ce->ce_namelen = 0;
+       }
+
        if (!previous_name) {
                size = ondisk_ce_size(ce);
                ondisk = xcalloc(1, size);
@@ -1761,6 +1864,10 @@ static int ce_write_entry(git_SHA_CTX *c, int fd, struct cache_entry *ce,
                strbuf_splice(previous_name, common, to_remove,
                              ce->name + common, ce_namelen(ce) - common);
        }
+       if (ce->ce_flags & CE_STRIP_NAME) {
+               ce->ce_namelen = saved_namelen;
+               ce->ce_flags &= ~CE_STRIP_NAME;
+       }
 
        result = ce_write(c, fd, ondisk, size);
        free(ondisk);
@@ -1830,13 +1937,13 @@ static int has_racy_timestamp(struct index_state *istate)
 void update_index_if_able(struct index_state *istate, struct lock_file *lockfile)
 {
        if ((istate->cache_changed || has_racy_timestamp(istate)) &&
-           verify_index(istate) && !write_index(istate, lockfile->fd))
-               commit_locked_index(lockfile);
-       else
+           verify_index(istate) &&
+           write_locked_index(istate, lockfile, COMMIT_LOCK))
                rollback_lock_file(lockfile);
 }
 
-int write_index(struct index_state *istate, int newfd)
+static int do_write_index(struct index_state *istate, int newfd,
+                         int strip_extensions)
 {
        git_SHA_CTX c;
        struct cache_header hdr;
@@ -1858,8 +1965,11 @@ int write_index(struct index_state *istate, int newfd)
                }
        }
 
-       if (!istate->version)
+       if (!istate->version) {
                istate->version = get_index_format_default();
+               if (getenv("GIT_TEST_SPLIT_INDEX"))
+                       init_split_index(istate);
+       }
 
        /* demote version 3 to version 2 when the latter suffices */
        if (istate->version == 3 || istate->version == 2)
@@ -1899,7 +2009,18 @@ int write_index(struct index_state *istate, int newfd)
        strbuf_release(&previous_name_buf);
 
        /* Write extension data here */
-       if (istate->cache_tree) {
+       if (!strip_extensions && istate->split_index) {
+               struct strbuf sb = STRBUF_INIT;
+
+               err = write_link_extension(&sb, istate) < 0 ||
+                       write_index_ext_header(&c, newfd, CACHE_EXT_LINK,
+                                              sb.len) < 0 ||
+                       ce_write(&c, newfd, sb.buf, sb.len) < 0;
+               strbuf_release(&sb);
+               if (err)
+                       return -1;
+       }
+       if (!strip_extensions && istate->cache_tree) {
                struct strbuf sb = STRBUF_INIT;
 
                cache_tree_write(&sb, istate->cache_tree);
@@ -1909,7 +2030,7 @@ int write_index(struct index_state *istate, int newfd)
                if (err)
                        return -1;
        }
-       if (istate->resolve_undo) {
+       if (!strip_extensions && istate->resolve_undo) {
                struct strbuf sb = STRBUF_INIT;
 
                resolve_undo_write(&sb, istate->resolve_undo);
@@ -1921,13 +2042,132 @@ int write_index(struct index_state *istate, int newfd)
                        return -1;
        }
 
-       if (ce_flush(&c, newfd) || fstat(newfd, &st))
+       if (ce_flush(&c, newfd, istate->sha1) || fstat(newfd, &st))
                return -1;
        istate->timestamp.sec = (unsigned int)st.st_mtime;
        istate->timestamp.nsec = ST_MTIME_NSEC(st);
        return 0;
 }
 
+void set_alternate_index_output(const char *name)
+{
+       alternate_index_output = name;
+}
+
+static int commit_locked_index(struct lock_file *lk)
+{
+       if (alternate_index_output)
+               return commit_lock_file_to(lk, alternate_index_output);
+       else
+               return commit_lock_file(lk);
+}
+
+static int do_write_locked_index(struct index_state *istate, struct lock_file *lock,
+                                unsigned flags)
+{
+       int ret = do_write_index(istate, lock->fd, 0);
+       if (ret)
+               return ret;
+       assert((flags & (COMMIT_LOCK | CLOSE_LOCK)) !=
+              (COMMIT_LOCK | CLOSE_LOCK));
+       if (flags & COMMIT_LOCK)
+               return commit_locked_index(lock);
+       else if (flags & CLOSE_LOCK)
+               return close_lock_file(lock);
+       else
+               return ret;
+}
+
+static int write_split_index(struct index_state *istate,
+                            struct lock_file *lock,
+                            unsigned flags)
+{
+       int ret;
+       prepare_to_write_split_index(istate);
+       ret = do_write_locked_index(istate, lock, flags);
+       finish_writing_split_index(istate);
+       return ret;
+}
+
+static char *temporary_sharedindex;
+
+static void remove_temporary_sharedindex(void)
+{
+       if (temporary_sharedindex) {
+               unlink_or_warn(temporary_sharedindex);
+               free(temporary_sharedindex);
+               temporary_sharedindex = NULL;
+       }
+}
+
+static void remove_temporary_sharedindex_on_signal(int signo)
+{
+       remove_temporary_sharedindex();
+       sigchain_pop(signo);
+       raise(signo);
+}
+
+static int write_shared_index(struct index_state *istate,
+                             struct lock_file *lock, unsigned flags)
+{
+       struct split_index *si = istate->split_index;
+       static int installed_handler;
+       int fd, ret;
+
+       temporary_sharedindex = git_pathdup("sharedindex_XXXXXX");
+       fd = mkstemp(temporary_sharedindex);
+       if (fd < 0) {
+               free(temporary_sharedindex);
+               temporary_sharedindex = NULL;
+               hashclr(si->base_sha1);
+               return do_write_locked_index(istate, lock, flags);
+       }
+       if (!installed_handler) {
+               atexit(remove_temporary_sharedindex);
+               sigchain_push_common(remove_temporary_sharedindex_on_signal);
+       }
+       move_cache_to_base_index(istate);
+       ret = do_write_index(si->base, fd, 1);
+       close(fd);
+       if (ret) {
+               remove_temporary_sharedindex();
+               return ret;
+       }
+       ret = rename(temporary_sharedindex,
+                    git_path("sharedindex.%s", sha1_to_hex(si->base->sha1)));
+       free(temporary_sharedindex);
+       temporary_sharedindex = NULL;
+       if (!ret)
+               hashcpy(si->base_sha1, si->base->sha1);
+       return ret;
+}
+
+int write_locked_index(struct index_state *istate, struct lock_file *lock,
+                      unsigned flags)
+{
+       struct split_index *si = istate->split_index;
+
+       if (!si || alternate_index_output ||
+           (istate->cache_changed & ~EXTMASK)) {
+               if (si)
+                       hashclr(si->base_sha1);
+               return do_write_locked_index(istate, lock, flags);
+       }
+
+       if (getenv("GIT_TEST_SPLIT_INDEX")) {
+               int v = si->base_sha1[0];
+               if ((v & 15) < 6)
+                       istate->cache_changed |= SPLIT_INDEX_ORDERED;
+       }
+       if (istate->cache_changed & SPLIT_INDEX_ORDERED) {
+               int ret = write_shared_index(istate, lock, flags);
+               if (ret)
+                       return ret;
+       }
+
+       return write_split_index(istate, lock, flags);
+}
+
 /*
  * Read the index file that is potentially unmerged into given
  * index_state, dropping any unmerged entries.  Returns true if
@@ -1959,7 +2199,6 @@ int read_index_unmerged(struct index_state *istate)
                if (add_index_entry(istate, new_ce, 0))
                        return error("%s: cannot drop to stage #0",
                                     new_ce->name);
-               i = index_name_pos(istate, new_ce->name, len);
        }
        return unmerged;
 }