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symlinkJoin: to extendMkDerivation, naively

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naive translation inlining runCommandWith
This commit is contained in:
Ross Smyth
2026-02-16 07:49:53 -08:00
committed by Philip Taron
parent 687fd7ba4b
commit 89ee800e37
1 changed files with 72 additions and 60 deletions
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pkgs/build-support/trivial-builders/default.nix
+72 -60
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@@ -572,69 +572,81 @@ rec {
other derivations. A derivation created with linkFarm is often used in CI
as a easy way to build multiple derivations at once.
*/
symlinkJoin =
args_@{
name ?
assert lib.assertMsg (
args_ ? pname && args_ ? version
) "symlinkJoin requires either a `name` OR `pname` and `version`";
"${args_.pname}-${args_.version}",
paths,
stripPrefix ? "",
preferLocalBuild ? true,
allowSubstitutes ? false,
postBuild ? "",
failOnMissing ? stripPrefix == "",
...
}:
assert lib.assertMsg (stripPrefix != "" -> (hasPrefix "/" stripPrefix && stripPrefix != "/")) ''
stripPrefix must be either an empty string (disable stripping behavior), or relative path prefixed with /.
symlinkJoin = lib.extendMkDerivation {
constructDrv = stdenvNoCC.mkDerivation;
Ensure that the path starts with / and specifies path to the subdirectory.
'';
extendDrvArgs =
finalAttrs:
args_@{
name ?
assert lib.assertMsg (
args_ ? pname && args_ ? version
) "symlinkJoin requires either a `name` OR `pname` and `version`";
"${args_.pname}-${args_.version}",
paths,
stripPrefix ? "",
preferLocalBuild ? true,
allowSubstitutes ? false,
postBuild ? "",
failOnMissing ? stripPrefix == "",
...
}:
assert lib.assertMsg (stripPrefix != "" -> (hasPrefix "/" stripPrefix && stripPrefix != "/")) ''
stripPrefix must be either an empty string (disable stripping behavior), or relative path prefixed with /.
let
mapPaths =
f: paths:
map (
path:
if path == null then
null
else if isList path then
mapPaths f path
else
f path
) paths;
args =
removeAttrs args_ [
"name"
"postBuild"
"stripPrefix"
"paths"
"failOnMissing"
]
// {
# Allow getting the proper position of the output derivation.
# Since one of these are required, it should be fairly accurate.
pos =
if args_ ? pname then
builtins.unsafeGetAttrPos "pname" args_
Ensure that the path starts with / and specifies path to the subdirectory.
'';
let
mapPaths =
f: paths:
map (
path:
if path == null then
null
else if isList path then
mapPaths f path
else
builtins.unsafeGetAttrPos "name" args_;
inherit preferLocalBuild allowSubstitutes;
paths = mapPaths (path: "${path}${stripPrefix}") paths;
passAsFile = [ "paths" ];
}; # pass the defaults
in
runCommand name args ''
mkdir -p $out
for i in $(cat $pathsPath); do
${optionalString (!failOnMissing) "if test -d $i; then "}${lndir}/bin/lndir -silent $i $out${
optionalString (!failOnMissing) "; fi"
}
done
${postBuild}
'';
f path
) paths;
drvArgs =
removeAttrs args_ [
"name"
"postBuild"
"stripPrefix"
"paths"
"failOnMissing"
]
// {
inherit preferLocalBuild allowSubstitutes;
paths = mapPaths (path: "${path}${stripPrefix}") paths;
}; # pass the defaults
in
{
enableParallelBuilding = true;
inherit name;
passAsFile = [
"buildCommand"
"paths"
];
buildCommand = ''
mkdir -p $out
for i in $(cat $pathsPath); do
${optionalString (!failOnMissing) "if test -d $i; then "}${lndir}/bin/lndir -silent $i $out${
optionalString (!failOnMissing) "; fi"
}
done
${postBuild}
'';
}
// lib.optionalAttrs (!drvArgs ? meta) {
pos =
let
args = builtins.attrNames drvArgs;
in
if builtins.length args > 0 then builtins.unsafeGetAttrPos (builtins.head args) drvArgs else null;
}
// drvArgs;
};
# TODO: move linkFarm docs to the Nixpkgs manual
/*