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nixos/update-users-groups: write files truly atomic

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Having the .tmp suffix is broken w.r.t. to multiple writers,
as they would overwrite existing files. using the atomic flag
will make write_file to create a unique temporary file it gets renamed
to its target.
This commit is contained in:
Jörg Thalheim 2020-09-23 10:47:39 +02:00
parent f072d4dadc
commit 99406adaae
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1 changed files with 1 additions and 2 deletions
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nixos/modules/config/update-users-groups.pl
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@ -16,8 +16,7 @@ my $gidMap = -e $gidMapFile ? decode_json(read_file($gidMapFile)) : {};
sub updateFile {
my ($path, $contents, $perms) = @_;
write_file("$path.tmp", { binmode => ':utf8', perms => $perms // 0644 }, $contents);
rename("$path.tmp", $path) or die;
write_file($path, { atomic => 1, binmode => ':utf8', perms => $perms // 0644 }, $contents) or die;
}