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nixos/switch-to-configuration: Get rid of all postfixes and unlesses

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This commit is contained in:
Janne Heß 2022-03-13 19:15:08 +01:00
parent 5c00fe6b1b
commit bdcd558812
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GPG Key ID: 69165158F05265DF
1 changed files with 64 additions and 33 deletions
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97
nixos/modules/system/activation/switch-to-configuration.pl
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@ -60,8 +60,9 @@ $ENV{NIXOS_ACTION} = $action;
# This is a NixOS installation if it has /etc/NIXOS or a proper
# /etc/os-release.
die("This is not a NixOS installation!\n") unless
-f "/etc/NIXOS" || (read_file("/etc/os-release", err_mode => 'quiet') // "") =~ /ID="?nixos"?/s;
if (!-f "/etc/NIXOS" && (read_file("/etc/os-release", err_mode => 'quiet') // "") !~ /ID="?nixos"?/s) {
die("This is not a NixOS installation!\n");
}
openlog("nixos", "", LOG_USER);
@ -74,9 +75,13 @@ EOFBOOTLOADER
}
# Just in case the new configuration hangs the system, do a sync now.
system("@coreutils@/bin/sync", "-f", "/nix/store") unless ($ENV{"NIXOS_NO_SYNC"} // "") eq "1";
if (($ENV{"NIXOS_NO_SYNC"} // "") ne "1") {
system("@coreutils@/bin/sync", "-f", "/nix/store");
}
exit(0) if $action eq "boot";
if ($action eq 'boot') {
exit(0);
}
# Check if we can activate the new configuration.
my $oldVersion = read_file("/run/current-system/init-interface-version", err_mode => 'quiet') // "";
@ -102,8 +107,12 @@ sub getActiveUnits {
for my $item (@$units) {
my ($id, $description, $load_state, $active_state, $sub_state,
$following, $unit_path, $job_id, $job_type, $job_path) = @$item;
next unless $following eq '';
next if $job_id == 0 and $active_state eq 'inactive';
if ($following ne '') {
next;
}
if ($job_id == 0 and $active_state eq 'inactive') {
next;
}
$res->{$id} = { load => $load_state, state => $active_state, substate => $sub_state };
}
return $res;
@ -128,7 +137,9 @@ sub parseFstab {
foreach my $line (read_file($filename, err_mode => 'quiet')) {
chomp($line);
$line =~ s/^\s*#.*//;
next if $line =~ /^\s*$/;
if ($line =~ /^\s*$/) {
next;
}
my @xs = split(/ /, $line);
if ($xs[2] eq "swap") {
$swaps->{$xs[0]} = { options => $xs[3] // "" };
@ -222,13 +233,17 @@ sub parseSystemdBool {
sub recordUnit {
my ($fn, $unit) = @_;
write_file($fn, { append => 1 }, "$unit\n") if $action ne "dry-activate";
if ($action ne 'dry-activate') {
write_file($fn, { append => 1 }, "$unit\n");
}
}
# The opposite of recordUnit, removes a unit name from a file
sub unrecord_unit {
my ($fn, $unit) = @_;
edit_file(sub { s/^$unit\n//msx }, $fn) if $action ne "dry-activate";
if ($action ne 'dry-activate') {
edit_file(sub { s/^$unit\n//msx }, $fn);
}
}
# Compare the contents of two unit files and return whether the unit
@ -454,13 +469,13 @@ my (%unitsToStop, %unitsToSkip, %unitsToStart, %unitsToRestart, %unitsToReload);
my %unitsToFilter; # units not shown
$unitsToStart{$_} = 1 foreach
%unitsToStart = map { $_ => 1 }
split('\n', read_file($startListFile, err_mode => 'quiet') // "");
$unitsToRestart{$_} = 1 foreach
%unitsToRestart = map { $_ => 1 }
split('\n', read_file($restartListFile, err_mode => 'quiet') // "");
$unitsToReload{$_} = 1 foreach
%unitsToReload = map { $_ => 1 }
split('\n', read_file($reloadListFile, err_mode => 'quiet') // "");
my $activePrev = getActiveUnits();
@ -483,7 +498,9 @@ while (my ($unit, $state) = each(%{$activePrev})) {
if (-e $prevUnitFile && ($state->{state} eq "active" || $state->{state} eq "activating")) {
if (! -e $newUnitFile || abs_path($newUnitFile) eq "/dev/null") {
my %unitInfo = parse_unit($prevUnitFile);
$unitsToStop{$unit} = 1 if parseSystemdBool(\%unitInfo, "Unit", "X-StopOnRemoval", 1);
if (parseSystemdBool(\%unitInfo, "Unit", "X-StopOnRemoval", 1)) {
$unitsToStop{$unit} = 1;
}
}
elsif ($unit =~ /\.target$/) {
@ -496,7 +513,7 @@ while (my ($unit, $state) = each(%{$activePrev})) {
# active after the system has resumed, which probably
# should not be the case. Just ignore it.
if ($unit ne "suspend.target" && $unit ne "hibernate.target" && $unit ne "hybrid-sleep.target") {
unless (parseSystemdBool(\%unitInfo, "Unit", "RefuseManualStart", 0) || parseSystemdBool(\%unitInfo, "Unit", "X-OnlyManualStart", 0)) {
if (!(parseSystemdBool(\%unitInfo, 'Unit', 'RefuseManualStart', 0) || parseSystemdBool(\%unitInfo, 'Unit', 'X-OnlyManualStart', 0))) {
$unitsToStart{$unit} = 1;
recordUnit($startListFile, $unit);
# Don't spam the user with target units that always get started.
@ -607,7 +624,9 @@ sub filterUnits {
my ($units) = @_;
my @res;
foreach my $unit (sort(keys(%{$units}))) {
push(@res, $unit) if !defined($unitsToFilter{$unit});
if (!defined($unitsToFilter{$unit})) {
push(@res, $unit);
}
}
return @res;
}
@ -617,10 +636,12 @@ my @unitsToStopFiltered = filterUnits(\%unitsToStop);
# Show dry-run actions.
if ($action eq "dry-activate") {
print STDERR "would stop the following units: ", join(", ", @unitsToStopFiltered), "\n"
if scalar(@unitsToStopFiltered) > 0;
print STDERR "would NOT stop the following changed units: ", join(", ", sort(keys(%unitsToSkip))), "\n"
if scalar(keys(%unitsToSkip)) > 0;
if (scalar(@unitsToStopFiltered) > 0) {
print STDERR "would stop the following units: ", join(", ", @unitsToStopFiltered), "\n";
}
if (scalar(keys(%unitsToSkip)) > 0) {
print STDERR "would NOT stop the following changed units: ", join(", ", sort(keys(%unitsToSkip))), "\n";
}
print STDERR "would activate the configuration...\n";
system("$out/dry-activate", "$out");
@ -660,14 +681,19 @@ if ($action eq "dry-activate") {
}
unlink($dryReloadByActivationFile);
print STDERR "would restart systemd\n" if $restartSystemd;
print STDERR "would reload the following units: ", join(", ", sort(keys(%unitsToReload))), "\n"
if scalar(keys(%unitsToReload)) > 0;
print STDERR "would restart the following units: ", join(", ", sort(keys(%unitsToRestart))), "\n"
if scalar(keys(%unitsToRestart)) > 0;
if ($restartSystemd) {
print STDERR "would restart systemd\n";
}
if (scalar(keys(%unitsToReload)) > 0) {
print STDERR "would reload the following units: ", join(", ", sort(keys(%unitsToReload))), "\n";
}
if (scalar(keys(%unitsToRestart)) > 0) {
print STDERR "would restart the following units: ", join(", ", sort(keys(%unitsToRestart))), "\n";
}
my @unitsToStartFiltered = filterUnits(\%unitsToStart);
print STDERR "would start the following units: ", join(", ", @unitsToStartFiltered), "\n"
if scalar(@unitsToStartFiltered);
if (scalar(@unitsToStartFiltered)) {
print STDERR "would start the following units: ", join(", ", @unitsToStartFiltered), "\n";
}
exit 0;
}
@ -675,14 +701,16 @@ if ($action eq "dry-activate") {
syslog(LOG_NOTICE, "switching to system configuration $out");
if (scalar(keys(%unitsToStop)) > 0) {
print STDERR "stopping the following units: ", join(", ", @unitsToStopFiltered), "\n"
if scalar(@unitsToStopFiltered);
if (scalar(@unitsToStopFiltered)) {
print STDERR "stopping the following units: ", join(", ", @unitsToStopFiltered), "\n";
}
# Use current version of systemctl binary before daemon is reexeced.
system("$curSystemd/systemctl", "stop", "--", sort(keys(%unitsToStop)));
}
print STDERR "NOT restarting the following changed units: ", join(", ", sort(keys(%unitsToSkip))), "\n"
if scalar(keys(%unitsToSkip)) > 0;
if (scalar(keys(%unitsToSkip)) > 0) {
print STDERR "NOT restarting the following changed units: ", join(", ", sort(keys(%unitsToSkip))), "\n";
}
# Activate the new configuration (i.e., update /etc, make accounts,
# and so on).
@ -745,7 +773,9 @@ system("@systemd@/bin/systemctl", "daemon-reload") == 0 or $res = 3;
# Reload user units
open(my $listActiveUsers, '-|', '@systemd@/bin/loginctl', 'list-users', '--no-legend');
while (my $f = <$listActiveUsers>) {
next unless $f =~ /^\s*(?<uid>\d+)\s+(?<user>\S+)/;
if ($f !~ /^\s*(?<uid>\d+)\s+(?<user>\S+)/) {
next;
}
my ($uid, $name) = ($+{uid}, $+{user});
print STDERR "reloading user units for $name...\n";
@ -802,8 +832,9 @@ if (scalar(keys(%unitsToRestart)) > 0) {
# same time because we'll get a "Failed to add path to set" error from
# systemd.
my @unitsToStartFiltered = filterUnits(\%unitsToStart);
print STDERR "starting the following units: ", join(", ", @unitsToStartFiltered), "\n"
if scalar(@unitsToStartFiltered);
if (scalar(@unitsToStartFiltered)) {
print STDERR "starting the following units: ", join(", ", @unitsToStartFiltered), "\n"
}
system("@systemd@/bin/systemctl", "start", "--", sort(keys(%unitsToStart))) == 0 or $res = 4;
unlink($startListFile);