mirror of
https://github.com/NixOS/nixpkgs.git
synced 2024-12-29 09:04:17 +00:00
3616cfb8d9
Unlike regular input-addressed or fixed-output derivations, floating and deferred derivations do not have their store path available at evaluation time, so their outPath is a placeholder. The following changes are needed for replaceDependencies to continue working: * Detect the placeholder and retrieve the store path using another IFD hack when collecting the rewrite plan. * Try to obtain the derivation name needed for replaceDirectDependencies from the derivation arguments if a placeholder is detected. * Move the length mismatch detection to build time, since the placeholder has a fixed length which is unrelated to the store path.
73 lines
1.9 KiB
Nix
73 lines
1.9 KiB
Nix
{
|
|
lib,
|
|
runCommandLocal,
|
|
nix,
|
|
}:
|
|
|
|
# Replace some direct dependencies of drv, not recursing into the dependency tree.
|
|
# You likely want to use replaceDependencies instead, unless you plan to implement your own recursion mechanism.
|
|
{
|
|
drv,
|
|
replacements ? [ ],
|
|
}:
|
|
let
|
|
inherit (lib)
|
|
isStorePath
|
|
substring
|
|
stringLength
|
|
optionalString
|
|
escapeShellArgs
|
|
concatMap
|
|
;
|
|
in
|
|
if replacements == [ ] then
|
|
drv
|
|
else
|
|
let
|
|
drvName =
|
|
if isStorePath drv then
|
|
# Reconstruct the name from the actual store path if available.
|
|
substring 33 (stringLength (baseNameOf drv)) (baseNameOf drv)
|
|
else if drv ? drvAttrs.name then
|
|
# Try to get the name from the derivation arguments otherwise (for floating or deferred derivations).
|
|
drv.drvAttrs.name
|
|
+ (
|
|
let
|
|
outputName = drv.outputName or "out";
|
|
in
|
|
optionalString (outputName != "out") "-${outputName}"
|
|
)
|
|
else
|
|
throw "cannot reconstruct the derivation name from ${drv}";
|
|
in
|
|
runCommandLocal drvName { nativeBuildInputs = [ nix.out ]; } ''
|
|
createRewriteScript() {
|
|
while [ $# -ne 0 ]; do
|
|
oldBasename="$(basename "$1")"
|
|
newBasename="$(basename "$2")"
|
|
shift 2
|
|
if [ ''${#oldBasename} -ne ''${#newBasename} ]; then
|
|
echo "cannot rewrite $oldBasename to $newBasename: length does not match" >&2
|
|
exit 1
|
|
fi
|
|
echo "s|$oldBasename|$newBasename|g" >> rewrite.sed
|
|
done
|
|
}
|
|
createRewriteScript ${
|
|
escapeShellArgs (
|
|
[
|
|
drv
|
|
(placeholder "out")
|
|
]
|
|
++ concatMap (
|
|
{ oldDependency, newDependency }:
|
|
[
|
|
oldDependency
|
|
newDependency
|
|
]
|
|
) replacements
|
|
)
|
|
}
|
|
nix-store --dump ${drv} | sed -f rewrite.sed | nix-store --restore $out
|
|
''
|