Merge branch 'jc/pull-rebase-ff'

diff --git a/builtin/pull.c b/builtin/pull.c
index 58fc176db681298bc6daf14b4cc09752d3b9bccc..3ecb881b0bcacbf1a453bf9a6cb95ae00cdecb1d 100644 (file)
--- a/builtin/pull.c
+++ b/builtin/pull.c
@@ -17,6 +17,7 @@
 #include "revision.h"
 #include "tempfile.h"
 #include "lockfile.h"
+#include "wt-status.h"
 
 enum rebase_type {
        REBASE_INVALID = -1,
@@ -325,82 +326,6 @@ static int git_pull_config(const char *var, const char *value, void *cb)
        return git_default_config(var, value, cb);
 }
 
-/**
- * Returns 1 if there are unstaged changes, 0 otherwise.
- */
-static int has_unstaged_changes(void)
-{
-       struct rev_info rev_info;
-       int result;
-
-       init_revisions(&rev_info, NULL);
-       DIFF_OPT_SET(&rev_info.diffopt, IGNORE_SUBMODULES);
-       DIFF_OPT_SET(&rev_info.diffopt, QUICK);
-       diff_setup_done(&rev_info.diffopt);
-       result = run_diff_files(&rev_info, 0);
-       return diff_result_code(&rev_info.diffopt, result);
-}
-
-/**
- * Returns 1 if there are uncommitted changes, 0 otherwise.
- */
-static int has_uncommitted_changes(void)
-{
-       struct rev_info rev_info;
-       int result;
-
-       if (is_cache_unborn())
-               return 0;
-
-       init_revisions(&rev_info, NULL);
-       DIFF_OPT_SET(&rev_info.diffopt, IGNORE_SUBMODULES);
-       DIFF_OPT_SET(&rev_info.diffopt, QUICK);
-       add_head_to_pending(&rev_info);
-       diff_setup_done(&rev_info.diffopt);
-       result = run_diff_index(&rev_info, 1);
-       return diff_result_code(&rev_info.diffopt, result);
-}
-
-/**
- * If the work tree has unstaged or uncommitted changes, dies with the
- * appropriate message.
- */
-static int require_clean_work_tree(const char *action, const char *hint,
-               int gently)
-{
-       struct lock_file *lock_file = xcalloc(1, sizeof(*lock_file));
-       int err = 0;
-
-       hold_locked_index(lock_file, 0);
-       refresh_cache(REFRESH_QUIET);
-       update_index_if_able(&the_index, lock_file);
-       rollback_lock_file(lock_file);
-
-       if (has_unstaged_changes()) {
-               /* TRANSLATORS: the action is e.g. "pull with rebase" */
-               error(_("Cannot %s: You have unstaged changes."), _(action));
-               err = 1;
-       }
-
-       if (has_uncommitted_changes()) {
-               if (err)
-                       error(_("Additionally, your index contains uncommitted changes."));
-               else
-                       error(_("Cannot %s: Your index contains uncommitted changes."),
-                             _(action));
-               err = 1;
-       }
-
-       if (err) {
-               if (hint)
-                       error("%s", hint);
-               if (!gently)
-                       exit(128);
-       }
-
-       return err;
-}
-
 /**
  * Appends merge candidates from FETCH_HEAD that are not marked not-for-merge
  * into merge_heads.
@@ -885,7 +810,7 @@ int cmd_pull(int argc, const char **argv, const char *prefix)
 
                if (!autostash)
                        require_clean_work_tree(N_("pull with rebase"),
-                               _("please commit or stash them."), 0);
+                               _("please commit or stash them."), 1, 0);
 
                if (get_rebase_fork_point(rebase_fork_point, repo, *refspecs))
                        hashclr(rebase_fork_point);
@@ -932,10 +857,24 @@ int cmd_pull(int argc, const char **argv, const char *prefix)
                if (merge_heads.nr > 1)
                        die(_("Cannot merge multiple branches into empty head."));
                return pull_into_void(*merge_heads.sha1, curr_head);
-       } else if (opt_rebase) {
-               if (merge_heads.nr > 1)
-                       die(_("Cannot rebase onto multiple branches."));
+       }
+       if (opt_rebase && merge_heads.nr > 1)
+               die(_("Cannot rebase onto multiple branches."));
+
+       if (opt_rebase) {
+               struct commit_list *list = NULL;
+               struct commit *merge_head, *head;
+
+               head = lookup_commit_reference(orig_head);
+               commit_list_insert(head, &list);
+               merge_head = lookup_commit_reference(merge_heads.sha1[0]);
+               if (is_descendant_of(merge_head, list)) {
+                       /* we can fast-forward this without invoking rebase */
+                       opt_ff = "--ff-only";
+                       return run_merge();
+               }
                return run_rebase(curr_head, *merge_heads.sha1, rebase_fork_point);
-       } else
+       } else {
                return run_merge();
+       }
 }