37d7abd694
The expression `with E1; E2' evaluates to E2 with all bindings in
the attribute set E1 substituted. E.g.,
with {x = 123;}; x
evaluates to 123. That is, the attribute set E1 is in scope in E2.
This is particularly useful when importing files containing lots
definitions. E.g., instead of
let {
inherit (import ./foo.nix) a b c d e f;
body = ... a ... f ...;
}
we can now say
with import ./foo.nix;
... a ... f ...
I.e., we don't have to say what variables should be brought into scope.
95 lines
2.2 KiB
Perl
Executable file
95 lines
2.2 KiB
Perl
Executable file
#! @perl@ -w
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use strict;
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use Cwd;
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use IO::Handle;
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STDOUT->autoflush(1);
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my $out = $ENV{"out"};
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mkdir "$out", 0755 || die "error creating $out";
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# For each activated package, create symlinks.
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sub createLinks {
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my $srcDir = shift;
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my $dstDir = shift;
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my @srcFiles = glob("$srcDir/*");
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foreach my $srcFile (@srcFiles) {
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my $baseName = $srcFile;
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$baseName =~ s/^.*\///g; # strip directory
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my $dstFile = "$dstDir/$baseName";
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if ($srcFile =~ /\/propagated-build-inputs$/ ||
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$srcFile =~ /\/nix-support$/ ||
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$srcFile =~ /\/log$/)
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{
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# Do nothing.
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}
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elsif (-d $srcFile) {
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lstat $dstFile;
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if (-d _) {
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createLinks($srcFile, $dstFile);
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}
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elsif (-l _) {
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my $target = readlink $dstFile or die;
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if (!-d $target) {
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die "collission between directory `$srcFile' and non-directory `$target'";
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}
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unlink $dstFile or die "error unlinking `$dstFile': $!";
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mkdir $dstFile, 0755 ||
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die "error creating directory `$dstFile': $!";
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createLinks($target, $dstFile);
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createLinks($srcFile, $dstFile);
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}
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else {
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symlink($srcFile, $dstFile) ||
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die "error creating link `$dstFile': $!";
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}
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}
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elsif (-l $dstFile) {
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my $target = readlink $dstFile;
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die "collission between `$srcFile' and `$target'";
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}
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else {
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# print "linking $dstFile to $srcFile\n";
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symlink($srcFile, $dstFile) ||
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die "error creating link `$dstFile': $!";
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}
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}
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}
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my %done;
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sub addPkg {
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my $pkgDir = shift;
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return if (defined $done{$pkgDir});
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$done{$pkgDir} = 1;
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createLinks("$pkgDir", "$out");
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}
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my @args = split ' ', $ENV{"derivations"};
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while (scalar @args > 0) {
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my $drvPath = shift @args;
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print "adding $drvPath\n";
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addPkg($drvPath);
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}
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symlink($ENV{"manifest"}, "$out/manifest") or die "cannot create manifest";
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