tests: check output, test rsync versions, close gaps in what's asserted

Several checks would pass with the feature they cover broken, or cover
it only by chance:

- Phases can state what a succeeding populate prints.  That covers the
  warnings of insecureLinks, the lines pruning prints, the one about a
  replaced symlink, and what rsync logs about each item.
- The insecureLinks scenarios take their expectations from the version of
  rsync, so with an rsync older than 3.5.0 they pass without the check
  ever running.  New tests, rsync-3-4-1 and rsync-3-5-0, run them with
  these versions, which tests/rsync.nix builds from their release
  tarballs, with ACLs and extended attributes, which backups use.
- Pruning has a leftover upload to remove, and a source that stops
  having inputs to root leaves no empty directory of roots.
- A full clone has every commit from the start, so the fetch for a commit
  it lacks never runs.  A git scenario deploys a commit that appears on
  the server after cloning.
- The jq test also runs the Nix function that finds a flake's
  subdirectory on the target, over both shapes of nix flake metadata's
  output.

1 files changed, 28 insertions, 1 deletions

diff --git a/tests/jq.sh b/tests/jq.sh
index a62d6cb..3794ce2 100755
--- a/tests/jq.sh
+++ b/tests/jq.sh
@@ -5,7 +5,7 @@
 # usage: jq.sh DIR
 #
 # DIR contains the programs as selected.jq, selfIsRemote.jq, and
-# selfLocked.jq.
+# selfLocked.jq, and the Nix function for the target as metadataSubdir.nix.
 set -efu
 
 programs=$1
@@ -119,4 +119,31 @@ expect "locked reference of the flake itself" "$(
       --from-file "$programs"/selfLocked.jq
 )" "$mono"
 
+# The Nix function finding the subdirectory on the target, which may lack
+# jq.
+# usage: metadata_subdir METADATA
+metadata_subdir() {
+  METADATA=$1 nix-instantiate --eval --strict --json --store dummy:// --expr "
+    (import $programs/metadataSubdir.nix)
+      (builtins.fromJSON (builtins.getEnv \"METADATA\"))
+  " 2>&1 || :
+}
+export HOME=${TMPDIR:-/tmp}
+export NIX_STATE_DIR=$HOME/nix-state
+expect "subdirectory as attribute, on the target" "$(metadata_subdir '{
+  "locked": { "type": "tarball", "url": "http://x/mono.tar.gz", "dir": "sub" },
+  "original": { "type": "tarball", "url": "http://x/mono.tar.gz", "dir": "sub" }
+}')" '"sub"'
+expect "subdirectory in the URL, on the target" "$(metadata_subdir '{
+  "locked": { "type": "tarball", "url": "http://x/mono.tar.gz?dir=sub&narHash=sha256-mono" },
+  "original": { "type": "tarball", "url": "http://x/mono.tar.gz?dir=sub" }
+}')" '"sub"'
+expect "subdirectory in the original reference only, on the target" "$(metadata_subdir '{
+  "locked": { "type": "tarball", "url": "http://x/mono.tar.gz" },
+  "original": { "type": "tarball", "url": "http://x/mono.tar.gz?rev=1&dir=sub" }
+}')" '"sub"'
+expect "no subdirectory, on the target" "$(metadata_subdir '{
+  "locked": { "type": "path", "path": "/src/top" }
+}')" '""'
+
 exit "$failed"