From 6529efefc7ca05c626849c9e7f7920785d86ab84 Mon Sep 17 00:00:00 2001
From: REPPL <77722411+REPPL@users.noreply.github.com>
Date: Sun, 12 Jul 2026 11:31:32 +0100
Subject: [PATCH 1/2] fix: report IsGitRepo in worktrees and submodules
 (iss-72)

core.Status used isDir(.git), but .git is a regular gitfile (a gitlink), not a
directory, in a linked git worktree (git worktree add) or a submodule checkout.
A genuine checkout was reported IsGitRepo=false. Test existence instead of
dir-ness for .git via a new exists() helper; HasRecord/WorkTiers stay dir-only.

Assisted-by: Claude:claude-opus-4-8
---
 CHANGELOG.md               |  5 +++++
 internal/core/core.go      | 15 +++++++++++++--
 internal/core/core_test.go | 17 +++++++++++++++++
 3 files changed, 35 insertions(+), 2 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4985c7dd..206cf1b7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -133,6 +133,11 @@ called out in a **Breaking** section.
 - The `created` and `updated` frontmatter fields on issues. Git is the canonical
   source of an issue's timeline; the ledger no longer duplicates it.
 
+### Fixed
+
+- `abcd` status now reports `IsGitRepo` correctly in a linked git worktree or a
+  submodule, where `.git` is a regular gitfile rather than a directory (iss-72).
+
 ### Security
 
 - **Release receipt-gate hardening** (iss-70). The `receipt_gate` record-lint
diff --git a/internal/core/core.go b/internal/core/core.go
index e2023256..6137f28e 100644
--- a/internal/core/core.go
+++ b/internal/core/core.go
@@ -43,8 +43,11 @@ func Status(dir string) (StatusInfo, error) {
 		return StatusInfo{}, err
 	}
 	s := StatusInfo{
-		Dir:       abs,
-		IsGitRepo: isDir(filepath.Join(abs, ".git")),
+		Dir: abs,
+		// .git is a directory in a normal clone but a regular gitfile in a linked
+		// worktree or submodule — both are genuine checkouts, so test existence, not
+		// dir-ness. HasRecord/WorkTiers stay dir-only (those must be directories).
+		IsGitRepo: exists(filepath.Join(abs, ".git")),
 		HasRecord: isDir(filepath.Join(abs, ".abcd", "development")),
 	}
 	for _, tier := range []struct{ path, name string }{
@@ -63,3 +66,11 @@ func isDir(p string) bool {
 	fi, err := os.Stat(p)
 	return err == nil && fi.IsDir()
 }
+
+// exists reports whether p exists (a file or a directory). A .git gitfile in a
+// worktree/submodule is a regular file, so a plain existence check is the correct
+// "is this a git checkout" test.
+func exists(p string) bool {
+	_, err := os.Stat(p)
+	return err == nil
+}
diff --git a/internal/core/core_test.go b/internal/core/core_test.go
index a6e94317..52c600e7 100644
--- a/internal/core/core_test.go
+++ b/internal/core/core_test.go
@@ -30,6 +30,23 @@ func TestStatusBareDir(t *testing.T) {
 	}
 }
 
+// TestStatusGitfileWorktree (iss-72) proves a linked worktree or submodule —
+// where .git is a regular gitfile, not a directory — is still reported as a git
+// repo. isDir would report false for a genuine checkout.
+func TestStatusGitfileWorktree(t *testing.T) {
+	dir := t.TempDir()
+	if err := os.WriteFile(filepath.Join(dir, ".git"), []byte("gitdir: /somewhere/.git/worktrees/wt\n"), 0o644); err != nil {
+		t.Fatal(err)
+	}
+	s, err := Status(dir)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !s.IsGitRepo {
+		t.Fatal("a worktree/submodule .git gitfile must report IsGitRepo=true")
+	}
+}
+
 func TestStatusWithRecordAndGit(t *testing.T) {
 	dir := t.TempDir()
 	mustMkdir(t, filepath.Join(dir, ".git"))

From 33fde347e3dbbe666bc583d47fcb47eac275a3db Mon Sep 17 00:00:00 2001
From: REPPL <77722411+REPPL@users.noreply.github.com>
Date: Sun, 12 Jul 2026 11:32:49 +0100
Subject: [PATCH 2/2] chore: resolve iss-72 in the ledger

Assisted-by: Claude:claude-opus-4-8
---
 .../{open => resolved}/iss-72-core-isgitrepo-misses-worktrees.md | 1 +
 1 file changed, 1 insertion(+)
 rename .abcd/work/issues/{open => resolved}/iss-72-core-isgitrepo-misses-worktrees.md (66%)

diff --git a/.abcd/work/issues/open/iss-72-core-isgitrepo-misses-worktrees.md b/.abcd/work/issues/resolved/iss-72-core-isgitrepo-misses-worktrees.md
similarity index 66%
rename from .abcd/work/issues/open/iss-72-core-isgitrepo-misses-worktrees.md
rename to .abcd/work/issues/resolved/iss-72-core-isgitrepo-misses-worktrees.md
index c9b64a86..64e68339 100644
--- a/.abcd/work/issues/open/iss-72-core-isgitrepo-misses-worktrees.md
+++ b/.abcd/work/issues/resolved/iss-72-core-isgitrepo-misses-worktrees.md
@@ -7,6 +7,7 @@ category: "bug"
 source: "agent-finding"
 found_during: "clean-slate-sweep"
 found_at: "internal/core/core.go"
+resolution: "core.Status now tests .git existence (file or dir) not dir-ness, so a linked worktree/submodule (where .git is a gitfile) reports IsGitRepo=true. os.Stat is correct (rejects dangling symlinks). ruthless SHIP; scoped to IsGitRepo only. PR opened."
 ---
 
 core.Status.IsGitRepo=false in a linked git worktree or submodule: isDir(.git) requires a directory but .git is a regular gitfile (gitlink) in worktrees/submodules, so a genuine checkout reports not-a-git-repo (core.go:47, C1). Detector: an exists-not-isDir check for .git with a worktree fixture. Corpus: C1.
\ No newline at end of file