test: add scenario for live data file being unreadable

3 files changed, 42 insertions, 0 deletions

diff --git a/obnam.md b/obnam.md
index 204d6d9..cb08f13 100644
--- a/obnam.md
+++ b/obnam.md
@@ -1269,6 +1269,28 @@ given a manifest of the directory live restored in rest in rest.yaml
 then files live.yaml and rest.yaml match
 ~~~
 
+## Unreadable file
+
+This scenario verifies that Obnam will back up all files of live data,
+even if one of them is unreadable. By inference, we assume this means
+other errors on individual files also won't end the backup
+prematurely.
+
+
+~~~scenario
+given an installed obnam
+and a running chunk server
+and a client config based on smoke.yaml
+and a file live/data.dat containing some random data
+and a file live/bad.dat containing some random data
+and file live/bad.dat has mode 000
+when I run obnam --config smoke.yaml backup
+then backup generation is GEN
+when I invoke obnam --config smoke.yaml restore <GEN> rest
+then file live/data.dat is restored to rest
+then file live/bad.dat is not restored to rest
+~~~
+
 ## Restore latest generation
 
 This scenario verifies that the latest backup generation can be
diff --git a/subplot/data.py b/subplot/data.py
index f3faf2b..f7fb903 100644
--- a/subplot/data.py
+++ b/subplot/data.py
@@ -54,6 +54,20 @@ def _create_manifest_of_directory(ctx, dirname=None, manifest=None):
     open(manifest, "w").write(stdout)
 
 
+def file_is_restored(ctx, filename=None, restored=None):
+    filename = os.path.join(restored, "./" + filename)
+    exists = os.path.exists(filename)
+    logging.debug(f"restored? {filename} {exists}")
+    assert exists
+
+
+def file_is_not_restored(ctx, filename=None, restored=None):
+    filename = os.path.join(restored, "./" + filename)
+    exists = os.path.exists(filename)
+    logging.debug(f"restored? {filename} {exists}")
+    assert not exists
+
+
 def files_match(ctx, first=None, second=None):
     assert_eq = globals()["assert_eq"]
 
diff --git a/subplot/data.yaml b/subplot/data.yaml
index 9538daa..1636e77 100644
--- a/subplot/data.yaml
+++ b/subplot/data.yaml
@@ -24,3 +24,9 @@
 
 - then: "stdout, as JSON, matches file {filename}"
   function: match_stdout_to_json_file
+
+- then: "file {filename} is restored to {restored}"
+  function: file_is_restored
+
+- then: "file {filename} is not restored to {restored}"
+  function: file_is_not_restored