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buildEnv: improve file check to avoid false-positives

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The original change in #55372 was supposed to fix the case where a store
path which is a file should be placed into `buildEnv` which broke with a
fairly misleading Perl error.

Unfortunately this introduced a regression, `findFiles` can have targets
that are files if the file isn't a store path. Rather than adding more
obscure checks with probably further regressions, I figured that it's
better to replicate the behavior of `lib.isStorePath` and explicitly
check if the store path is a file and break in this case only.

This should also fix recent staging issues.
This commit is contained in:
Maximilian Bosch 2019-02-20 10:41:20 +01:00 committed by Frederik Rietdijk
parent e2cd07b997
commit 9fcd3bffc2
2 changed files with 19 additions and 4 deletions
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12
pkgs/build-support/buildenv/builder.pl
View file

@ -26,6 +26,13 @@ sub isInPathsToLink {
return 0;
}
# Similar to `lib.isStorePath`
sub isStorePath {
my $path = shift;
my $storePath = "@storeDir@";
return substr($path, 0, 1) eq "/" && dirname($path) eq $storePath;
}
# For each activated package, determine what symlinks to create.
@ -84,8 +91,9 @@ sub checkCollision {
sub findFiles {
my ($relName, $target, $baseName, $ignoreCollisions, $checkCollisionContents, $priority) = @_;
if (-f $target) {
die "Path $target is a file and can't be merged into an environment using pkgs.buildEnv!";
# The store path must not be a file
if (-f $target && isStorePath $target) {
die "The store path $target is a file and can't be merged into an environment using pkgs.buildEnv!";
}
# Urgh, hacky...

11
pkgs/build-support/buildenv/default.nix
View file

@ -2,7 +2,7 @@
# a fork of the buildEnv in the Nix distribution. Most changes should
# eventually be merged back into the Nix distribution.
{ buildPackages, runCommand, lib }:
{ buildPackages, runCommand, lib, substituteAll }:
lib.makeOverridable
({ name
@ -43,6 +43,13 @@ lib.makeOverridable
, meta ? {}
}:
let
builder = substituteAll {
src = ./builder.pl;
inherit (builtins) storeDir;
};
in
runCommand name
rec {
inherit manifest ignoreCollisions checkCollisionContents passthru
@ -67,6 +74,6 @@ runCommand name
passAsFile = if builtins.stringLength pkgs >= 128*1024 then [ "pkgs" ] else null;
}
''
${buildPackages.perl}/bin/perl -w ${./builder.pl}
${buildPackages.perl}/bin/perl -w ${builder}
eval "$postBuild"
'')