From bacac7cf54bdfdb41091a506dd1b158da08a2d78 Mon Sep 17 00:00:00 2001
From: Robert Helgesson <robert@rycee.net>
Date: Mon, 8 Aug 2022 20:00:02 +0200
Subject: [PATCH] sigal: fix crash when building gallery
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When building a gallery using `sigal build` the process would error
out with an message along the lines of

    shutil.Error: [('/nix/store/…/static/css',
                    '/…/_build/static/css',
                    "[Errno 13] Permission denied: '/…/_build/static/css'"),
                   …
                  ]

This is caused by `shutil.copytree` copying the permissions (555) of
the directories in the Nix store and then attempting to make
modifications to the copied directory. The patch makes the copy ignore
the permissions of directories.
---
 .../misc/sigal/copytree-permissions.patch        | 16 ++++++++++++++++
 pkgs/applications/misc/sigal/default.nix         |  2 ++
 2 files changed, 18 insertions(+)
 create mode 100644 pkgs/applications/misc/sigal/copytree-permissions.patch

diff --git a/pkgs/applications/misc/sigal/copytree-permissions.patch b/pkgs/applications/misc/sigal/copytree-permissions.patch
new file mode 100644
index 000000000000..352e1f0d2dcc
--- /dev/null
+++ b/pkgs/applications/misc/sigal/copytree-permissions.patch
@@ -0,0 +1,16 @@
+diff -Nurp sigal-2.3.orig/sigal/writer.py sigal-2.3/sigal/writer.py
+--- sigal-2.3.orig/sigal/writer.py	2022-08-08 19:43:10.934707194 +0200
++++ sigal-2.3/sigal/writer.py	2022-08-08 19:44:57.542382532 +0200
+@@ -103,7 +103,11 @@ class AbstractWriter:
+             os.path.join(THEMES_PATH, 'default', 'static'),
+             os.path.join(self.theme, 'static'),
+         ):
+-            shutil.copytree(static_path, self.theme_path, dirs_exist_ok=True)
++            # https://stackoverflow.com/a/17022146/4935114
++            orig_copystat = shutil.copystat
++            shutil.copystat = lambda x, y: x
++            shutil.copytree(static_path, self.theme_path, dirs_exist_ok=True, copy_function=shutil.copy)
++            shutil.copystat = orig_copystat
+ 
+         if self.settings["user_css"]:
+             if not os.path.exists(self.settings["user_css"]):
diff --git a/pkgs/applications/misc/sigal/default.nix b/pkgs/applications/misc/sigal/default.nix
index 8289cc428db3..fb0a19dbb44a 100644
--- a/pkgs/applications/misc/sigal/default.nix
+++ b/pkgs/applications/misc/sigal/default.nix
@@ -14,6 +14,8 @@ python3.pkgs.buildPythonApplication rec {
     hash = "sha256-4Zsb/OBtU/jV0gThEYe8bcrb+6hW+hnzQS19q1H409Q=";
   };
 
+  patches = [ ./copytree-permissions.patch ];
+
   propagatedBuildInputs = with python3.pkgs; [
     # install_requires
     jinja2