1 files changed, 117 insertions, 0 deletions
diff --git a/nix/runExecline/tests.nix b/nix/runExecline/tests.nix
new file mode 100644
index 000000000000..f82b544224ee
--- /dev/null
+++ b/nix/runExecline/tests.nix
@@ -0,0 +1,117 @@
+{ stdenv
+, pkgs
+, runExecline
+, runExeclineLocal
+, getBins
+, writeScript
+  # https://www.mail-archive.com/skaware@list.skarnet.org/msg01256.html
+, coreutils
+}:
+
+let
+
+  bins = getBins coreutils [ "mv" ]
+    // getBins pkgs.execline [
+    "execlineb"
+    { use = "if"; as = "execlineIf"; }
+    "redirfd"
+    "importas"
+  ]
+    // getBins pkgs.s6-portable-utils [
+    "s6-chmod"
+    "s6-grep"
+    "s6-touch"
+    "s6-cat"
+    "s6-test"
+  ];
+
+  # execline block of depth 1
+  block = args: builtins.map (arg: " ${arg}") args ++ [ "" ];
+
+  # derivation that tests whether a given line exists
+  # in the given file. Does not use runExecline, because
+  # that should be tested after all.
+  fileHasLine = line: file: derivation {
+    name = "run-execline-test-file-${file.name}-has-line";
+    inherit (stdenv) system;
+    builder = bins.execlineIf;
+    args =
+      (block [
+        bins.redirfd
+        "-r"
+        "0"
+        file # read file to stdin
+        bins.s6-grep
+        "-F"
+        "-q"
+        line # and grep for the line
+      ])
+      ++ [
+        # if the block succeeded, touch $out
+        bins.importas
+        "-ui"
+        "out"
+        "out"
+        bins.s6-touch
+        "$out"
+      ];
+    preferLocalBuild = true;
+    allowSubstitutes = false;
+  };
+
+  # basic test that touches out
+  basic = runExeclineLocal "run-execline-test-basic"
+    { } [
+    "importas"
+    "-ui"
+    "out"
+    "out"
+    "${bins.s6-touch}"
+    "$out"
+  ];
+
+  # whether the stdin argument works as intended
+  stdin = fileHasLine "foo" (runExeclineLocal "run-execline-test-stdin"
+    {
+      stdin = "foo\nbar\nfoo";
+    } [
+    "importas"
+    "-ui"
+    "out"
+    "out"
+    # this pipes stdout of s6-cat to $out
+    # and s6-cat redirects from stdin to stdout
+    "redirfd"
+    "-w"
+    "1"
+    "$out"
+    bins.s6-cat
+  ]);
+
+
+  wrapWithVar = runExeclineLocal "run-execline-test-wrap-with-var"
+    {
+      builderWrapper = writeScript "var-wrapper" ''
+        #!${bins.execlineb} -S0
+        export myvar myvalue $@
+      '';
+    } [
+    "importas"
+    "-ui"
+    "v"
+    "myvar"
+    "if"
+    [ bins.s6-test "myvalue" "=" "$v" ]
+    "importas"
+    "out"
+    "out"
+    bins.s6-touch
+    "$out"
+  ];
+
+in
+[
+  basic
+  stdin
+  wrapWithVar
+]