checkMeta works in strange ways? #37350
Description
I would like to better understand the semantics of checkMeta. When applying the following patch on top of commit 4e1ab9d
diff --git a/pkgs/applications/misc/gmtp/default.nix b/pkgs/applications/misc/gmtp/default.nix
index 423eea914b9..8b2c006ffe6 100644
--- a/pkgs/applications/misc/gmtp/default.nix
+++ b/pkgs/applications/misc/gmtp/default.nix
@@ -21,7 +21,7 @@ stdenv.mkDerivation {
description = "A simple MP3 and Media player client for UNIX and UNIX like systems.";
homepage = https://gmtp.sourceforge.io;
platforms = stdenv.lib.platforms.linux;
- maintainers = [ stdenv.lib.maintainers.pbogdan ];
+ maintainer = stdenv.lib.maintainers.doesnotexist;
license = stdenv.lib.licenses.bsd3;
};
}performing the following
~/Code/nixpkgs master@4e1ab9d44c0 ✗ nix-env -qaP --arg config '{ checkMeta = true; }' --show-trace -f . --meta --json --out-path -A gmtp -I nixpkgs=.
{}% ~/Code/nixpkgs master@4e1ab9d44c0 ✗ echo $?
0
~/Code/nixpkgs master@4e1ab9d44c0 ✗ nix-env -qaP --show-trace -f . --meta --json --out-path -A gmtp -I nixpkgs=.
{
"gmtp": {
"name": "gmtp-1.3.11",
"system": "x86_64-linux",
"meta": {
"available": true,
"description": "A simple MP3 and Media player client for UNIX and UNIX like systems.",
"homepage": "https://gmtp.sourceforge.io",
"license": {
"fullName": "BSD 3-clause \"New\" or \"Revised\" License",
"shortName": "bsd3",
"spdxId": "BSD-3-Clause",
"url": "http://spdx.org/licenses/BSD-3-Clause.html"
},
"maintainer":
}
}
error: while evaluating the attribute 'lib.maintainers.doesnotexist' at /shared/Code/nixpkgs/lib/default.nix:24:5:
attribute 'doesnotexist' missing, at /shared/Code/nixpkgs/pkgs/applications/misc/gmtp/default.nix:24:18
}%
~/Code/nixpkgs master@4e1ab9d44c0 ✗ echo $?
1
yields results that are unexpected to me. I would expect adding checkMeta to result in more stringent evaluation of the result, instead it appears to return with no result at all with exit code indicating a success. Without checkMeta the evaluation fails with an error and exit code indicating so.
I'm probably misunderstanding what checkMeta is supposed to do - I would appreciate any help in trying to understand it better.