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nixos/switch-to-configuration: Lock the switch

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This prevents any concurrent switches from happening which is not an
issue I have seen people complaining about but it seems like a good
measure.
This commit is contained in:
Janne Heß 2023-09-29 19:46:10 +02:00
parent 3397af26c4
commit 5d7723dd5b
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1 changed files with 4 additions and 0 deletions
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4
nixos/modules/system/activation/switch-to-configuration.pl
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@ -22,6 +22,7 @@ use JSON::PP;
use IPC::Cmd; use IPC::Cmd;
use Sys::Syslog qw(:standard :macros); use Sys::Syslog qw(:standard :macros);
use Cwd qw(abs_path); use Cwd qw(abs_path);
use Fcntl ':flock';
## no critic(ControlStructures::ProhibitDeepNests) ## no critic(ControlStructures::ProhibitDeepNests)
## no critic(ErrorHandling::RequireCarping) ## no critic(ErrorHandling::RequireCarping)
@ -91,6 +92,8 @@ if (!-f "/etc/NIXOS" && (read_file("/etc/os-release", err_mode => "quiet") // ""
} }
make_path("/run/nixos", { mode => oct(755) }); make_path("/run/nixos", { mode => oct(755) });
open(my $stc_lock, '>>', '/run/nixos/switch-to-configuration.lock') or die "Could not open lock - $!";
flock($stc_lock, LOCK_EX) or die "Could not acquire lock - $!";
openlog("nixos", "", LOG_USER); openlog("nixos", "", LOG_USER);
# Install or update the bootloader. # Install or update the bootloader.
@ -983,4 +986,5 @@ if ($res == 0) {
syslog(LOG_ERR, "switching to system configuration $toplevel failed (status $res)"); syslog(LOG_ERR, "switching to system configuration $toplevel failed (status $res)");
} }
close($stc_lock) or die "Could not close lock - $!";
exit($res); exit($res);