test: add verification test for non-UTF8 filenames

3 files changed, 28 insertions, 0 deletions

diff --git a/obnam.md b/obnam.md
index fbbf994..6706fb7 100644
--- a/obnam.md
+++ b/obnam.md
@@ -876,6 +876,25 @@ given a manifest of the directory live restored in rest in rest.yaml
 then files live.yaml and rest.yaml match
 ~~~
 
+## Tricky filenames
+
+Obnam needs to handle all filenames the underlying operating and file
+system can handle. This scenario verifies it can handle a filename
+that consists on a single byte with its top bit set. This is not
+ASCII, and it's not UTF-8.
+
+~~~scenario
+given an installed obnam
+and a running chunk server
+and a client config based on metadata.yaml
+and a file in live with a non-UTF8 filename
+and a manifest of the directory live in live.yaml
+when I run obnam --config metadata.yaml backup
+then backup generation is GEN
+when I invoke obnam --config metadata.yaml restore <GEN> rest
+given a manifest of the directory live restored in rest in rest.yaml
+then files live.yaml and rest.yaml match
+~~~
 
 
 
diff --git a/subplot/data.py b/subplot/data.py
index ba3636c..a24cd0c 100644
--- a/subplot/data.py
+++ b/subplot/data.py
@@ -13,6 +13,12 @@ def create_file_with_random_data(ctx, filename=None):
         f.write(data)
 
 
+def create_nonutf8_filename(ctx, dirname=None):
+    filename = "\x88"
+    os.mkdir(dirname)
+    open(filename, "wb").close()
+
+
 def chmod_file(ctx, filename=None, mode=None):
     os.chmod(filename, int(mode, 8))
 
diff --git a/subplot/data.yaml b/subplot/data.yaml
index 32c9cd5..7659319 100644
--- a/subplot/data.yaml
+++ b/subplot/data.yaml
@@ -6,6 +6,9 @@
 - given: "a file {filename} containing some random data"
   function: create_file_with_random_data
 
+- given: "a file in {dirname} with a non-UTF8 filename"
+  function: create_nonutf8_filename
+
 - given: file {filename} has mode {mode}
   function: chmod_file