populate: run pipe commands through a shell

A pipe source's command is an absolute path, which a shell runs as a
script if it isn't a program, e.g. lacks #!.  The program ran it
directly, which fails for such a command.

pipe-script runs a pipe command without #!.

1 files changed, 13 insertions, 0 deletions

diff --git a/tests/scenarios.nix b/tests/scenarios.nix
index 15d0a53..362a854 100644
--- a/tests/scenarios.nix
+++ b/tests/scenarios.nix
@@ -1176,6 +1176,19 @@ assert !(krops.isLocalTarget (targets.remote "/"));
         expect.fail = "error: flake /fixtures/top has no input nope";
       }];
     })
+    # A pipe command without #!, which a shell runs as a script.
+    (s "pipe-script" {
+      prepareDeployer = ''
+        printf 'echo piped\n' > /tmp/pipe-script
+        chmod +x /tmp/pipe-script
+      '';
+      phases = [{
+        sources.x.pipe = "/tmp/pipe-script";
+        check = ''
+          expect_eq x "$(cat "$T"/x)" piped
+        '';
+      }];
+    })
     # An input locked to a path the target doesn't have.
     (s "gone" {
       phases = [{