From ac38f5a21500ad0e7fd8dac229a6dbadc9a14bfa Mon Sep 17 00:00:00 2001
From: Scott Worley <scottworley@scottworley.com>
Date: Wed, 24 Jan 2024 19:18:18 -0800
Subject: [PATCH] Allow identically-broken symlinks

---
 Changelog |  2 +-
 pinch.py  | 31 ++++++++++++++++---------------
 2 files changed, 17 insertions(+), 16 deletions(-)

diff --git a/Changelog b/Changelog
index 4507467..e4989b4 100644
--- a/Changelog
+++ b/Changelog
@@ -1,5 +1,5 @@
 ## [Unreleased]
-- Allow nixpkgs' additional new intentionally-invalid symlinks
+- Allow identical broken symlinks
 
 
 ## [3.0.12] - 2023-12-07
diff --git a/pinch.py b/pinch.py
index e20d5d1..9e80c01 100644
--- a/pinch.py
+++ b/pinch.py
@@ -414,14 +414,24 @@ def verify_git_ancestry(
     v.result(process.returncode == 0)
 
 
+def broken_symlinks_are_identical(root1: str, root2: str, path: str) -> bool:
+    a = os.path.join(root1, path)
+    b = os.path.join(root2, path)
+    return (os.path.islink(a)
+            and os.path.islink(b)
+            and not os.path.exists(a)
+            and not os.path.exists(b)
+            and os.readlink(a) == os.readlink(b))
+
+
 def compare_tarball_and_git(
         v: Verification,
         pin: GitPin,
         channel_contents: str,
         git_contents: str) -> None:
     v.status('Comparing channel tarball with git checkout')
-    match, mismatch, errors = compare(os.path.join(
-        channel_contents, pin.release_name), git_contents)
+    tarball_contents = os.path.join(channel_contents, pin.release_name)
+    match, mismatch, errors = compare(tarball_contents, git_contents)
     v.ok()
     v.check(f'{len(match)} files match', len(match) > 0)
     v.check(f'{len(mismatch)} files differ', len(mismatch) == 0)
@@ -431,30 +441,21 @@ def compare_tarball_and_git(
         'nixpkgs',
         'programs.sqlite',
         'svn-revision']
-    permitted_errors = [
-        'pkgs/test/nixpkgs-check-by-name/tests/multiple-failures/pkgs/by-name/A/fo@/foo',
-        'pkgs/test/nixpkgs-check-by-name/tests/symlink-invalid/pkgs/by-name/fo/foo/foo',
-        'pkgs/test/nixpkgs-check-by-name/tests/symlink-invalid/pkgs/by-name/fo/foo/foo.nix',
-    ]
     benign_expected_errors = []
-    benign_permitted_errors = []
     for ee in expected_errors:
         if ee in errors:
             errors.remove(ee)
             benign_expected_errors.append(ee)
-    for pe in permitted_errors:
-        if pe in errors:
-            errors.remove(pe)
-            benign_permitted_errors.append(ee)
+    errors = [
+        e for e in errors
+        if not broken_symlinks_are_identical(tarball_contents, git_contents, e)
+    ]
     v.check(
         f'{len(errors)} unexpected incomparable files: {errors}',
         len(errors) == 0)
     v.check(
         f'({len(benign_expected_errors)} of {len(expected_errors)} expected incomparable files)',
         len(benign_expected_errors) == len(expected_errors))
-    v.check(
-        f'({len(benign_permitted_errors)} of {len(permitted_errors)} permitted incomparable files)',
-        len(benign_permitted_errors) <= len(permitted_errors))
 
 
 def extract_tarball(
-- 
2.44.1