clone: don't clone the info/alternates file
[gitweb.git] / update-index.c
index ce1db38d16928d8b5085cb6e177f40fff9a978cf..00cde706459936daf4da371404b8e313a95f9649 100644 (file)
@@ -6,6 +6,7 @@
 #include "cache.h"
 #include "strbuf.h"
 #include "quote.h"
+#include "tree-walk.h"
 
 /*
  * Default to not allowing changes to the list of files. The
@@ -114,8 +115,7 @@ static int add_file_to_cache(const char *path)
 
        namelen = strlen(path);
        size = cache_entry_size(namelen);
-       ce = xmalloc(size);
-       memset(ce, 0, size);
+       ce = xcalloc(1, size);
        memcpy(ce->name, path, namelen);
        ce->ce_flags = htons(namelen);
        fill_stat_cache_info(ce, &st);
@@ -312,8 +312,7 @@ static int add_cacheinfo(unsigned int mode, const unsigned char *sha1,
 
        len = strlen(path);
        size = cache_entry_size(len);
-       ce = xmalloc(size);
-       memset(ce, 0, size);
+       ce = xcalloc(1, size);
 
        memcpy(ce->sha1, sha1, 20);
        memcpy(ce->name, path, len);
@@ -330,7 +329,7 @@ static int add_cacheinfo(unsigned int mode, const unsigned char *sha1,
        return 0;
 }
 
-static int chmod_path(int flip, const char *path)
+static void chmod_path(int flip, const char *path)
 {
        int pos;
        struct cache_entry *ce;
@@ -338,21 +337,24 @@ static int chmod_path(int flip, const char *path)
 
        pos = cache_name_pos(path, strlen(path));
        if (pos < 0)
-               return -1;
+               goto fail;
        ce = active_cache[pos];
        mode = ntohl(ce->ce_mode);
        if (!S_ISREG(mode))
-               return -1;
+               goto fail;
        switch (flip) {
        case '+':
                ce->ce_mode |= htonl(0111); break;
        case '-':
                ce->ce_mode &= htonl(~0111); break;
        default:
-               return -1;
+               goto fail;
        }
        active_cache_changed = 1;
-       return 0;
+       report("chmod %cx '%s'", flip, path);
+       return;
+ fail:
+       die("git-update-index: cannot chmod %cx '%s'", flip, path);
 }
 
 static struct cache_file cache_file;
@@ -362,23 +364,26 @@ static void update_one(const char *path, const char *prefix, int prefix_length)
        const char *p = prefix_path(prefix, prefix_length, path);
        if (!verify_path(p)) {
                fprintf(stderr, "Ignoring path %s\n", path);
-               return;
+               goto free_return;
        }
        if (mark_valid_only) {
                if (mark_valid(p))
                        die("Unable to mark file %s", path);
-               return;
+               goto free_return;
        }
 
        if (force_remove) {
                if (remove_file_from_cache(p))
                        die("git-update-index: unable to remove %s", path);
                report("remove '%s'", path);
-               return;
+               goto free_return;
        }
        if (add_file_to_cache(p))
                die("Unable to process file %s", path);
        report("add '%s'", path);
+ free_return:
+       if (p < path || p > path + strlen(path))
+               free((char*)p);
 }
 
 static void read_index_info(int line_termination)
@@ -471,7 +476,129 @@ static void read_index_info(int line_termination)
 }
 
 static const char update_index_usage[] =
-"git-update-index [-q] [--add] [--replace] [--remove] [--unmerged] [--refresh] [--cacheinfo] [--chmod=(+|-)x] [--info-only] [--force-remove] [--stdin] [--index-info] [--ignore-missing] [-z] [--verbose] [--] <file>...";
+"git-update-index [-q] [--add] [--replace] [--remove] [--unmerged] [--refresh] [--really-refresh] [--cacheinfo] [--chmod=(+|-)x] [--assume-unchanged] [--info-only] [--force-remove] [--stdin] [--index-info] [--unresolve] [--ignore-missing] [-z] [--verbose] [--] <file>...";
+
+static unsigned char head_sha1[20];
+static unsigned char merge_head_sha1[20];
+
+static struct cache_entry *read_one_ent(const char *which,
+                                       unsigned char *ent, const char *path,
+                                       int namelen, int stage)
+{
+       unsigned mode;
+       unsigned char sha1[20];
+       int size;
+       struct cache_entry *ce;
+
+       if (get_tree_entry(ent, path, sha1, &mode)) {
+               error("%s: not in %s branch.", path, which);
+               return NULL;
+       }
+       if (mode == S_IFDIR) {
+               error("%s: not a blob in %s branch.", path, which);
+               return NULL;
+       }
+       size = cache_entry_size(namelen);
+       ce = xcalloc(1, size);
+
+       memcpy(ce->sha1, sha1, 20);
+       memcpy(ce->name, path, namelen);
+       ce->ce_flags = create_ce_flags(namelen, stage);
+       ce->ce_mode = create_ce_mode(mode);
+       return ce;
+}
+
+static int unresolve_one(const char *path)
+{
+       int namelen = strlen(path);
+       int pos;
+       int ret = 0;
+       struct cache_entry *ce_2 = NULL, *ce_3 = NULL;
+
+       /* See if there is such entry in the index. */
+       pos = cache_name_pos(path, namelen);
+       if (pos < 0) {
+               /* If there isn't, either it is unmerged, or
+                * resolved as "removed" by mistake.  We do not
+                * want to do anything in the former case.
+                */
+               pos = -pos-1;
+               if (pos < active_nr) {
+                       struct cache_entry *ce = active_cache[pos];
+                       if (ce_namelen(ce) == namelen &&
+                           !memcmp(ce->name, path, namelen)) {
+                               fprintf(stderr,
+                                       "%s: skipping still unmerged path.\n",
+                                       path);
+                               goto free_return;
+                       }
+               }
+       }
+
+       /* Grab blobs from given path from HEAD and MERGE_HEAD,
+        * stuff HEAD version in stage #2,
+        * stuff MERGE_HEAD version in stage #3.
+        */
+       ce_2 = read_one_ent("our", head_sha1, path, namelen, 2);
+       ce_3 = read_one_ent("their", merge_head_sha1, path, namelen, 3);
+
+       if (!ce_2 || !ce_3) {
+               ret = -1;
+               goto free_return;
+       }
+       if (!memcmp(ce_2->sha1, ce_3->sha1, 20) &&
+           ce_2->ce_mode == ce_3->ce_mode) {
+               fprintf(stderr, "%s: identical in both, skipping.\n",
+                       path);
+               goto free_return;
+       }
+
+       remove_file_from_cache(path);
+       if (add_cache_entry(ce_2, ADD_CACHE_OK_TO_ADD)) {
+               error("%s: cannot add our version to the index.", path);
+               ret = -1;
+               goto free_return;
+       }
+       if (!add_cache_entry(ce_3, ADD_CACHE_OK_TO_ADD))
+               return 0;
+       error("%s: cannot add their version to the index.", path);
+       ret = -1;
+ free_return:
+       free(ce_2);
+       free(ce_3);
+       return ret;
+}
+
+static void read_head_pointers(void)
+{
+       if (read_ref(git_path("HEAD"), head_sha1))
+               die("No HEAD -- no initial commit yet?\n");
+       if (read_ref(git_path("MERGE_HEAD"), merge_head_sha1)) {
+               fprintf(stderr, "Not in the middle of a merge.\n");
+               exit(0);
+       }
+}
+
+static int do_unresolve(int ac, const char **av,
+                       const char *prefix, int prefix_length)
+{
+       int i;
+       int err = 0;
+
+       /* Read HEAD and MERGE_HEAD; if MERGE_HEAD does not exist, we
+        * are not doing a merge, so exit with success status.
+        */
+       read_head_pointers();
+
+       for (i = 1; i < ac; i++) {
+               const char *arg = av[i];
+               const char *p = prefix_path(prefix, prefix_length, arg);
+               err |= unresolve_one(p);
+               if (p < arg || p > arg + strlen(arg))
+                       free((char*)p);
+       }
+       return err;
+}
 
 int main(int argc, const char **argv)
 {
@@ -480,6 +607,7 @@ int main(int argc, const char **argv)
        int read_from_stdin = 0;
        const char *prefix = setup_git_directory();
        int prefix_length = prefix ? strlen(prefix) : 0;
+       char set_executable_bit = 0;
 
        git_config(git_default_config);
 
@@ -546,8 +674,7 @@ int main(int argc, const char **argv)
                            !strcmp(path, "--chmod=+x")) {
                                if (argc <= i+1)
                                        die("git-update-index: %s <path>", path);
-                               if (chmod_path(path[8], argv[++i]))
-                                       die("git-update-index: %s cannot chmod %s", path, argv[i]);
+                               set_executable_bit = path[8];
                                continue;
                        }
                        if (!strcmp(path, "--assume-unchanged")) {
@@ -577,9 +704,18 @@ int main(int argc, const char **argv)
                                break;
                        }
                        if (!strcmp(path, "--index-info")) {
+                               if (i != argc - 1)
+                                       die("--index-info must be at the end");
                                allow_add = allow_replace = allow_remove = 1;
                                read_index_info(line_termination);
-                               continue;
+                               break;
+                       }
+                       if (!strcmp(path, "--unresolve")) {
+                               has_errors = do_unresolve(argc - i, argv + i,
+                                                         prefix, prefix_length);
+                               if (has_errors)
+                                       active_cache_changed = 0;
+                               goto finish;
                        }
                        if (!strcmp(path, "--ignore-missing")) {
                                not_new = 1;
@@ -594,12 +730,15 @@ int main(int argc, const char **argv)
                        die("unknown option %s", path);
                }
                update_one(path, prefix, prefix_length);
+               if (set_executable_bit)
+                       chmod_path(set_executable_bit, path);
        }
        if (read_from_stdin) {
                struct strbuf buf;
                strbuf_init(&buf);
                while (1) {
                        char *path_name;
+                       const char *p;
                        read_line(&buf, stdin, line_termination);
                        if (buf.eof)
                                break;
@@ -607,11 +746,18 @@ int main(int argc, const char **argv)
                                path_name = unquote_c_style(buf.buf, NULL);
                        else
                                path_name = buf.buf;
-                       update_one(path_name, prefix, prefix_length);
+                       p = prefix_path(prefix, prefix_length, path_name);
+                       update_one(p, NULL, 0);
+                       if (set_executable_bit)
+                               chmod_path(set_executable_bit, p);
+                       if (p < path_name || p > path_name + strlen(path_name))
+                               free((char*) p);
                        if (path_name != buf.buf)
                                free(path_name);
                }
        }
+
+ finish:
        if (active_cache_changed) {
                if (write_cache(newfd, active_cache, active_nr) ||
                    commit_index_file(&cache_file))