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install-grub.pl: Write state file atomically.

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Other files were already written atomically, but not this one.
This commit is contained in:
Niklas Hambüchen 2020-04-24 00:20:56 +02:00
parent 0dcad215fe
commit 81c15742ce
1 changed files with 8 additions and 1 deletions
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9
nixos/modules/system/boot/loader/grub/install-grub.pl
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@ -682,11 +682,18 @@ if (($requireNewInstall != 0) && ($efiTarget eq "only" || $efiTarget eq "both"))
# update GRUB state file
if ($requireNewInstall != 0) {
open FILE, ">$bootPath/grub/state" or die "cannot create $bootPath/grub/state: $!\n";
# Temp file for atomic rename.
my $stateFile = "$bootPath/grub/state";
my $stateFileTmp = $stateFile . ".tmp";
open FILE, ">$stateFileTmp" or die "cannot create $stateFileTmp: $!\n";
print FILE get("fullName"), "\n" or die;
print FILE get("fullVersion"), "\n" or die;
print FILE $efiTarget, "\n" or die;
print FILE join( ",", @deviceTargets ), "\n" or die;
print FILE $efiSysMountPoint, "\n" or die;
close FILE or die;
# Atomically switch to the new state file
rename $stateFileTmp, $stateFile or die "cannot rename $stateFileTmp to $stateFile\n";
}