From 9221783af54a87298e2d65229258b2af8de8a87e Mon Sep 17 00:00:00 2001
From: jonasc <github@bcdf.eu>
Date: Mon, 1 Jun 2020 19:37:43 +0200
Subject: [PATCH] Assert existence of config file's parent directory

Fixes TheLocehiliosan/yadm#226

When a config file path is passed to yadm whose parent directory does
not exist, git (and hence yadm) fails without writing the file.
Yadm should, however, make sure that the directory exists s.t. git can
just write to the file.
---
 test/test_config.py | 24 ++++++++++++++++++++++++
 yadm                |  2 ++
 2 files changed, 26 insertions(+)

diff --git a/test/test_config.py b/test/test_config.py
index 4e44b1c..17d0248 100644
--- a/test/test_config.py
+++ b/test/test_config.py
@@ -137,3 +137,27 @@ def test_config_local_write(runner, yadm_y, paths, supported_local_configs):
         assert run.success
         assert run.err == ''
         assert run.out.strip() == f'value_of_{config}'
+
+
+def test_config_without_parent_directory(runner, yadm_y, paths):
+    """Write and read attribute to/from config file with non-existent parent directory
+
+    Update configuration file
+    Display value
+    Exit with 0
+    """
+
+    config_file = paths.root + '/folder/does/not/exist/config'
+
+    run = runner(yadm_y('--yadm-config', config_file, 'config', TEST_KEY, TEST_VALUE))
+
+    assert run.success
+    assert run.err == ''
+    assert run.out == ''
+
+    paths.config.write(TEST_FILE)
+    run = runner(yadm_y('--yadm-config', config_file, 'config', TEST_KEY))
+
+    assert run.success
+    assert run.err == ''
+    assert run.out.strip() == TEST_VALUE
diff --git a/yadm b/yadm
index f3a2343..28bfce2 100755
--- a/yadm
+++ b/yadm
@@ -849,6 +849,8 @@ EOF
     CHANGES_POSSIBLE=1
 
   else
+    # make sure parent folder of config file exists
+    assert_parent "$YADM_CONFIG"
     # operate on the yadm configuration file
     "$GIT_PROGRAM" config --file="$(mixed_path "$YADM_CONFIG")" "$@"