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update-script-combinators.copyAttrOutputToFile: init

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Useful for storing generated files into Nixpkgs repo as a part of an update script to avoid a build time dependency.
This commit is contained in:
Jan Tojnar 2022-09-04 12:36:11 +02:00
parent 7d6b5d171a
commit 9137e671a2
1 changed files with 34 additions and 4 deletions
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38
pkgs/common-updater/combinators.nix
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@ -19,7 +19,8 @@
command : (FilePath | [ (FilePath | String) ])
// Features that the script supports
// - commit: (experimental) returns commit message in stdout
supportedFeatures : ?[ "commit" ]
// - silent: (experimental) returns no stdout
supportedFeatures : ?[ ("commit" | "silent") ]
// Override attribute path detected by update.nix
attrPath : ?String
}
@ -118,11 +119,40 @@ rec {
in
let
scripts = scriptsNormalized;
validateFeatures = ({ supportedFeatures, ... }: supportedFeatures == [ ]);
hasCommitSupport = lib.findSingle ({ supportedFeatures, ... }: supportedFeatures == [ "commit" ]) null null scripts != null;
validateFeatures =
if hasCommitSupport then
({ supportedFeatures, ... }: supportedFeatures == [ "commit" ] || supportedFeatures == [ "silent" ])
else
({ supportedFeatures, ... }: supportedFeatures == [ ]);
in
assert lib.assertMsg (lib.all validateFeatures scripts) "Combining update scripts with features enabled is currently unsupported.";
assert lib.assertMsg (lib.all validateFeatures scripts) "Combining update scripts with features enabled (other than a single script with “commit” and all other with “silent”) is currently unsupported.";
assert lib.assertMsg (builtins.length (lib.unique (builtins.map ({ attrPath ? null, ... }: attrPath) scripts)) == 1) "Combining update scripts with different attr paths is currently unsupported.";
commandsToShellInvocation (builtins.map ({ command, ... }: command) scripts);
{
command = commandsToShellInvocation (builtins.map ({ command, ... }: command) scripts);
supportedFeatures = lib.optionals hasCommitSupport [
"commit"
];
};
/*
copyAttrOutputToFile : String → FilePath → UpdateScript
EXPERIMENTAL! Simple update script that copies the output of Nix derivation built by `attr` to `path`.
*/
copyAttrOutputToFile =
attr:
path:
{
command = [
"sh"
"-c"
"cp --no-preserve=all \"$(nix-build -A ${attr})\" \"$0\" > /dev/null"
path
];
supportedFeatures = [ "silent" ];
};
}