merge: clarify "pulling into void" special case
[gitweb.git] / builtin / merge.c
index ce82eb297db3d03394f4e73a9b07574661db7090..878f82a4109b90541c09e2fa2624b4cd918cf6b8 100644 (file)
@@ -9,6 +9,7 @@
 #include "cache.h"
 #include "parse-options.h"
 #include "builtin.h"
+#include "lockfile.h"
 #include "run-command.h"
 #include "diff.h"
 #include "refs.h"
@@ -237,11 +238,10 @@ static void drop_save(void)
 static int save_state(unsigned char *stash)
 {
        int len;
-       struct child_process cp;
+       struct child_process cp = CHILD_PROCESS_INIT;
        struct strbuf buffer = STRBUF_INIT;
        const char *argv[] = {"stash", "create", NULL};
 
-       memset(&cp, 0, sizeof(cp));
        cp.argv = argv;
        cp.out = -1;
        cp.git_cmd = 1;
@@ -557,7 +557,7 @@ static void parse_branch_merge_options(char *bmo)
        if (argc < 0)
                die(_("Bad branch.%s.mergeoptions string: %s"), branch,
                    split_cmdline_strerror(argc));
-       argv = xrealloc(argv, sizeof(*argv) * (argc + 2));
+       REALLOC_ARRAY(argv, argc + 2);
        memmove(argv + 1, argv, sizeof(*argv) * (argc + 1));
        argc++;
        argv[0] = "branch.*.mergeoptions";
@@ -657,19 +657,18 @@ static int try_merge_strategy(const char *strategy, struct commit_list *common,
                              struct commit_list *remoteheads,
                              struct commit *head, const char *head_arg)
 {
-       struct lock_file *lock = xcalloc(1, sizeof(struct lock_file));
+       static struct lock_file lock;
 
-       hold_locked_index(lock, 1);
+       hold_locked_index(&lock, 1);
        refresh_cache(REFRESH_QUIET);
        if (active_cache_changed &&
-           write_locked_index(&the_index, lock, COMMIT_LOCK))
+           write_locked_index(&the_index, &lock, COMMIT_LOCK))
                return error(_("Unable to write index."));
-       rollback_lock_file(lock);
+       rollback_lock_file(&lock);
 
        if (!strcmp(strategy, "recursive") || !strcmp(strategy, "subtree")) {
                int clean, x;
                struct commit *result;
-               struct lock_file *lock = xcalloc(1, sizeof(struct lock_file));
                struct commit_list *reversed = NULL;
                struct merge_options o;
                struct commit_list *j;
@@ -697,13 +696,13 @@ static int try_merge_strategy(const char *strategy, struct commit_list *common,
                for (j = common; j; j = j->next)
                        commit_list_insert(j->item, &reversed);
 
-               hold_locked_index(lock, 1);
+               hold_locked_index(&lock, 1);
                clean = merge_recursive(&o, head,
                                remoteheads->item, reversed, &result);
                if (active_cache_changed &&
-                   write_locked_index(&the_index, lock, COMMIT_LOCK))
+                   write_locked_index(&the_index, &lock, COMMIT_LOCK))
                        die (_("unable to write %s"), get_index_file());
-               rollback_lock_file(lock);
+               rollback_lock_file(&lock);
                return clean ? 0 : 1;
        } else {
                return try_merge_command(strategy, xopts_nr, xopts,
@@ -1102,7 +1101,7 @@ int cmd_merge(int argc, const char **argv, const char *prefix)
         * Check if we are _not_ on a detached HEAD, i.e. if there is a
         * current branch.
         */
-       branch = branch_to_free = resolve_refdup("HEAD", head_sha1, 0, &flag);
+       branch = branch_to_free = resolve_refdup("HEAD", 0, head_sha1, &flag);
        if (branch && starts_with(branch, "refs/heads/"))
                branch += 11;
        if (!branch || is_null_sha1(head_sha1))
@@ -1144,14 +1143,14 @@ int cmd_merge(int argc, const char **argv, const char *prefix)
                 */
                if (advice_resolve_conflict)
                        die(_("You have not concluded your merge (MERGE_HEAD exists).\n"
-                                 "Please, commit your changes before you can merge."));
+                                 "Please, commit your changes before you merge."));
                else
                        die(_("You have not concluded your merge (MERGE_HEAD exists)."));
        }
        if (file_exists(git_path("CHERRY_PICK_HEAD"))) {
                if (advice_resolve_conflict)
                        die(_("You have not concluded your cherry-pick (CHERRY_PICK_HEAD exists).\n"
-                           "Please, commit your changes before you can merge."));
+                           "Please, commit your changes before you merge."));
                else
                        die(_("You have not concluded your cherry-pick (CHERRY_PICK_HEAD exists)."));
        }
@@ -1166,36 +1165,20 @@ int cmd_merge(int argc, const char **argv, const char *prefix)
                option_commit = 0;
        }
 
-       if (!abort_current_merge) {
-               if (!argc) {
-                       if (default_to_upstream)
-                               argc = setup_with_upstream(&argv);
-                       else
-                               die(_("No commit specified and merge.defaultToUpstream not set."));
-               } else if (argc == 1 && !strcmp(argv[0], "-"))
-                       argv[0] = "@{-1}";
+       if (!argc) {
+               if (default_to_upstream)
+                       argc = setup_with_upstream(&argv);
+               else
+                       die(_("No commit specified and merge.defaultToUpstream not set."));
+       } else if (argc == 1 && !strcmp(argv[0], "-")) {
+               argv[0] = "@{-1}";
        }
+
        if (!argc)
                usage_with_options(builtin_merge_usage,
                        builtin_merge_options);
 
-       /*
-        * This could be traditional "merge <msg> HEAD <commit>..."  and
-        * the way we can tell it is to see if the second token is HEAD,
-        * but some people might have misused the interface and used a
-        * commit-ish that is the same as HEAD there instead.
-        * Traditional format never would have "-m" so it is an
-        * additional safety measure to check for it.
-        */
-
-       if (!have_message && head_commit &&
-           is_old_style_invocation(argc, argv, head_commit->object.sha1)) {
-               strbuf_addstr(&merge_msg, argv[0]);
-               head_arg = argv[1];
-               argv += 2;
-               argc -= 2;
-               remoteheads = collect_parents(head_commit, &head_subsumed, argc, argv);
-       } else if (!head_commit) {
+       if (!head_commit) {
                struct commit *remote_head;
                /*
                 * If the merged head is a valid one there is no reason
@@ -1218,6 +1201,23 @@ int cmd_merge(int argc, const char **argv, const char *prefix)
                update_ref("initial pull", "HEAD", remote_head->object.sha1,
                           NULL, 0, UPDATE_REFS_DIE_ON_ERR);
                goto done;
+       }
+
+       /*
+        * This could be traditional "merge <msg> HEAD <commit>..."  and
+        * the way we can tell it is to see if the second token is HEAD,
+        * but some people might have misused the interface and used a
+        * commit-ish that is the same as HEAD there instead.
+        * Traditional format never would have "-m" so it is an
+        * additional safety measure to check for it.
+        */
+       if (!have_message &&
+           is_old_style_invocation(argc, argv, head_commit->object.sha1)) {
+               strbuf_addstr(&merge_msg, argv[0]);
+               head_arg = argv[1];
+               argv += 2;
+               argc -= 2;
+               remoteheads = collect_parents(head_commit, &head_subsumed, argc, argv);
        } else {
                struct strbuf merge_names = STRBUF_INIT;