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buildEnv: better warning and error messages

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This commit is contained in:
Peter Ferenczy 2021-08-15 16:30:49 +02:00
parent 3ddf009748
commit f8be06a311
1 changed files with 35 additions and 3 deletions
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38
pkgs/build-support/buildenv/builder.pl
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@ -10,6 +10,9 @@ use JSON::PP;
STDOUT->autoflush(1);
$SIG{__WARN__} = sub { warn "warning: ", @_ };
$SIG{__DIE__} = sub { die "error: ", @_ };
my $out = $ENV{"out"};
my @pathsToLink = split ' ', $ENV{"pathsToLink"};
@ -88,6 +91,10 @@ sub findFilesInDir {
sub checkCollision {
my ($path1, $path2) = @_;
if (! -e $path1 || ! -e $path2) {
return 0;
}
my $stat1 = (stat($path1))[2];
my $stat2 = (stat($path2))[2];
@ -101,6 +108,11 @@ sub checkCollision {
return compare($path1, $path2) == 0;
}
sub prependDangling {
my $path = shift;
return (-l $path && ! -e $path ? "dangling symlink " : "") . "`$path'";
}
sub findFiles {
my ($relName, $target, $baseName, $ignoreCollisions, $checkCollisionContents, $priority) = @_;
@ -125,12 +137,21 @@ sub findFiles {
# symlink to a file (not a directory) in a lower-priority package,
# overwrite it.
if (!defined $oldTarget || ($priority < $oldPriority && ($oldTarget ne "" && ! -d $oldTarget))) {
# If target is a dangling symlink, emit a warning.
if (-l $target && ! -e $target) {
my $link = readlink $target;
warn "creating dangling symlink `$out$extraPrefix/$relName' -> `$target' -> `$link'\n";
}
$symlinks{$relName} = [$target, $priority];
return;
}
# If target already exists and both targets resolves to the same path, skip
if (defined $oldTarget && $oldTarget ne "" && abs_path($target) eq abs_path($oldTarget)) {
if (
defined $oldTarget && $oldTarget ne "" &&
defined abs_path($target) && defined abs_path($oldTarget) &&
abs_path($target) eq abs_path($oldTarget)
) {
# Prefer the target that is not a symlink, if any
if (-l $oldTarget && ! -l $target) {
$symlinks{$relName} = [$target, $priority];
@ -144,14 +165,25 @@ sub findFiles {
return;
}
# If target is supposed to be a directory but it isn't, die with an error message
# instead of attempting to recurse into it, only to fail then.
# This happens e.g. when pathsToLink contains a non-directory path.
if ($oldTarget eq "" && ! -d $target) {
die "not a directory: `$target'\n";
}
unless (-d $target && ($oldTarget eq "" || -d $oldTarget)) {
# Prepend "dangling symlink" to paths if applicable.
my $targetRef = prependDangling($target);
my $oldTargetRef = prependDangling($oldTarget);
if ($ignoreCollisions) {
warn "collision between `$target' and `$oldTarget'\n" if $ignoreCollisions == 1;
warn "collision between $targetRef and $oldTargetRef\n" if $ignoreCollisions == 1;
return;
} elsif ($checkCollisionContents && checkCollision($oldTarget, $target)) {
return;
} else {
die "collision between `$target' and `$oldTarget'\n";
die "collision between $targetRef and $oldTargetRef\n";
}
}