feat(nix/utils): add onlyDrvPath to get the drvPath w/o the outputs r/4175

I want to use this utility in a deploy script where the .drv is
nix-copy-closure-d to a remote host and realized there. Consequently it
doesn't make sense that the local deploy script depends on the
derivation's outputs which drvPath does by default.

This also came up when working on //nix/buildkite, although we didn't
end up using it there.

Change-Id: I952bbfd4d7e9de212569d5ee12182eb50d360f53
Reviewed-on: https://cl.tvl.fyi/c/depot/+/5767
Tested-by: BuildkiteCI
Autosubmit: sterni <sternenseemann@systemli.org>
Reviewed-by: tazjin <tazjin@tvl.su>

1 files changed, 16 insertions, 0 deletions

diff --git a/nix/utils/default.nix b/nix/utils/default.nix
index 0c6c88fafd5a..a29f346519b8 100644
--- a/nix/utils/default.nix
+++ b/nix/utils/default.nix
@@ -43,6 +43,21 @@ let
     else builtins.throw "Don't know how to get (base)name of "
       + lib.generators.toPretty { } p;
 
+  /* Retrieves the drvPath attribute from a given derivation, but ensures that
+     the resulting string only depends on the `.drv` file in the nix store and
+     not on its realised outputs as well.
+
+     Type: drv -> string
+  */
+  onlyDrvPath = drv:
+    let
+      inherit (drv) drvPath;
+      unsafeDrvPath = builtins.unsafeDiscardStringContext drvPath;
+    in
+    builtins.appendContext unsafeDrvPath {
+      ${unsafeDrvPath} = { path = true; };
+    };
+
   /* Query the type of a path exposing the same information as would be by
      `builtins.readDir`, but for a single, specific target path.
 
@@ -152,6 +167,7 @@ in
 {
   inherit
     storePathName
+    onlyDrvPath
     pathType
     isDirectory
     isRegularFile