refs/bisect is unfortunately per-worktree, so we need to look in
per-worktree logs/refs/bisect in addition to per-repo logs/refs. The
current iterator only goes through per-repo logs/refs.

Ideally we should have something like merge_ref_iterator_begin (and
maybe with a predicate), but for dir_iterator. Since there's only one
use case for this pattern, let's not add a bunch more code for
merge_dir_iterator_begin just yet.

PS. Note the unsorted order of for_each_reflog in the test. This is
supposed to be OK, for now. If we enforce order on for_each_reflog()
then some more work will be required.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclo...@gmail.com>
---
 refs/files-backend.c          | 46 ++++++++++++++++++++++++++++++++-----------
 t/t1407-worktree-ref-store.sh | 30 ++++++++++++++++++++++++++++
 2 files changed, 65 insertions(+), 11 deletions(-)

diff --git a/refs/files-backend.c b/refs/files-backend.c
index 4149943a6e..fce380679c 100644
--- a/refs/files-backend.c
+++ b/refs/files-backend.c
@@ -1171,15 +1171,6 @@ static void files_reflog_path(struct files_ref_store 
*refs,
                              struct strbuf *sb,
                              const char *refname)
 {
-       if (!refname) {
-               /*
-                * FIXME: of course this is wrong in multi worktree
-                * setting. To be fixed real soon.
-                */
-               strbuf_addf(sb, "%s/logs", refs->gitcommondir);
-               return;
-       }
-
        switch (ref_type(refname)) {
        case REF_TYPE_PER_WORKTREE:
        case REF_TYPE_PSEUDOREF:
@@ -3368,6 +3359,7 @@ struct files_reflog_iterator {
 
        struct ref_store *ref_store;
        struct dir_iterator *dir_iterator;
+       struct dir_iterator *worktree_dir_iterator;
        struct object_id oid;
 };
 
@@ -3388,6 +3380,21 @@ static int files_reflog_iterator_advance(struct 
ref_iterator *ref_iterator)
                if (ends_with(diter->basename, ".lock"))
                        continue;
 
+               if (iter->worktree_dir_iterator) {
+                       const char *refname = diter->relative_path;
+
+                       switch (ref_type(refname)) {
+                       case REF_TYPE_PER_WORKTREE:
+                       case REF_TYPE_PSEUDOREF:
+                               continue;
+                       case REF_TYPE_NORMAL:
+                               break;
+                       default:
+                               die("BUG: unknown ref type %d of ref %s",
+                                   ref_type(refname), refname);
+                       }
+               }
+
                if (refs_read_ref_full(iter->ref_store,
                                       diter->relative_path, 0,
                                       iter->oid.hash, &flags)) {
@@ -3401,7 +3408,11 @@ static int files_reflog_iterator_advance(struct 
ref_iterator *ref_iterator)
                return ITER_OK;
        }
 
-       iter->dir_iterator = NULL;
+       iter->dir_iterator = iter->worktree_dir_iterator;
+       if (iter->worktree_dir_iterator) {
+               iter->worktree_dir_iterator = NULL;
+               return files_reflog_iterator_advance(ref_iterator);
+       }
        if (ref_iterator_abort(ref_iterator) == ITER_ERROR)
                ok = ITER_ERROR;
        return ok;
@@ -3422,6 +3433,12 @@ static int files_reflog_iterator_abort(struct 
ref_iterator *ref_iterator)
        if (iter->dir_iterator)
                ok = dir_iterator_abort(iter->dir_iterator);
 
+       if (iter->worktree_dir_iterator) {
+               int ok2 = dir_iterator_abort(iter->worktree_dir_iterator);
+               if (ok2 == ITER_ERROR)
+                       ok = ok2;
+       }
+
        base_ref_iterator_free(ref_iterator);
        return ok;
 }
@@ -3442,10 +3459,17 @@ static struct ref_iterator 
*files_reflog_iterator_begin(struct ref_store *ref_st
        struct strbuf sb = STRBUF_INIT;
 
        base_ref_iterator_init(ref_iterator, &files_reflog_iterator_vtable);
-       files_reflog_path(refs, &sb, NULL);
+       strbuf_addf(&sb, "%s/logs", refs->gitcommondir);
        iter->dir_iterator = dir_iterator_begin(sb.buf);
        iter->ref_store = ref_store;
        strbuf_release(&sb);
+
+       if (strcmp(refs->gitdir, refs->gitcommondir)) {
+               strbuf_addf(&sb, "%s/logs", refs->gitdir);
+               iter->worktree_dir_iterator = dir_iterator_begin(sb.buf);
+               strbuf_release(&sb);
+       }
+
        return ref_iterator;
 }
 
diff --git a/t/t1407-worktree-ref-store.sh b/t/t1407-worktree-ref-store.sh
index 5df06f3556..8842d0329f 100755
--- a/t/t1407-worktree-ref-store.sh
+++ b/t/t1407-worktree-ref-store.sh
@@ -49,4 +49,34 @@ test_expect_success 'create_symref(FOO, refs/heads/master)' '
        test_cmp expected actual
 '
 
+test_expect_success 'for_each_reflog()' '
+       echo $_z40 > .git/logs/PSEUDO-MAIN &&
+       mkdir -p     .git/logs/refs/bisect &&
+       echo $_z40 > .git/logs/refs/bisect/random &&
+
+       echo $_z40 > .git/worktrees/wt/logs/PSEUDO-WT &&
+       mkdir -p     .git/worktrees/wt/logs/refs/bisect &&
+       echo $_z40 > .git/worktrees/wt/logs/refs/bisect/wt-random &&
+
+       $RWT for-each-reflog | cut -c 42- | sort >actual &&
+       cat >expected <<-\EOF &&
+       HEAD 0x1
+       PSEUDO-WT 0x0
+       refs/bisect/wt-random 0x0
+       refs/heads/master 0x0
+       refs/heads/wt-master 0x0
+       EOF
+       test_cmp expected actual &&
+
+       $RMAIN for-each-reflog | cut -c 42- | sort >actual &&
+       cat >expected <<-\EOF &&
+       HEAD 0x1
+       PSEUDO-MAIN 0x0
+       refs/bisect/random 0x0
+       refs/heads/master 0x0
+       refs/heads/wt-master 0x0
+       EOF
+       test_cmp expected actual
+'
+
 test_done
-- 
2.11.0.157.gd943d85

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