Implement signals
Minimum viable product. TERM closes gracefully, KILL just removes PID, and USR1 rotates immediately and restarts timer. Other changes: - Whitespace - Implemented using lazy, excessive use of global variables. This needs to be improved. - Comment blocks
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E9C5EA2D867501AB
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@ -2,10 +2,14 @@
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use strict;
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use warnings;
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use POSIX;
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use lib "$ENV{HOME}/perl5/lib/perl5";
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our $debug = 1; # For testing, will output configuration and errors if true
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our %settings;
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our @e;
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our $pidfile = "/tmp/$ENV{USER}-wallpaper.pid";
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use AnyEvent::Sway;
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our $s = AnyEvent::Sway->new();
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@ -30,28 +34,31 @@ are currently enabled will be set.\n
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exit(0);
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}
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# SIGUSR reset the timer, force immediate reload, continue looping
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$SIG{USR1} = sub {
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# TODO: Update the timeout method so that the daemon will simply run the job as a function.
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# when SIGUSR1 is received, force the alarm to expire immediately in order to rotate the image without delay.
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print "This should rotate the image, but it doesn't yet";
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alarm 0;
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run(%settings);
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};
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# SIGTERM reset the timer, clean pid, and allow for the main loop to finish run
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$SIG{TERM} = sub {
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alarm 0;
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clean();
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exit(0);
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$settings{daemon} = 0;
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};
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$SIG{INT} = sub {
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# SIGKILL clean pid then exit immediately
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$SIG{KILL} = sub {
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clean();
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exit(0);
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};
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sub clean
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{
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my $pidfile = "/var/run/$ENV{HOME}-wallpaper.pid";
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if (-e $pidfile) {
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open (my $fh, '<', $pidfile);
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my $p = <$fh>;
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close($fh);
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chomp $p;
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kill($p);
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unlink($pidfile);
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@ -60,14 +67,12 @@ sub clean
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sub choose_image
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{
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my $path = shift;
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my @w = glob("$path/*");
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my @w = glob("$settings{path}/*");
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return undef unless (scalar(@w));
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my @i;
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foreach (@w) {
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if (-d "$path/$_") {
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if (-d "$settings{path}/$_") {
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next;
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}
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if ($_ =~ m/\.(png|jpg)$/) {
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@ -159,12 +164,62 @@ sub set_background
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return "Failed to run Sway IPC command '$cmd'";
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}
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my @targets;
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my $daemon = 0;
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my $delay = 300;
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my $crop = 1;
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my $path;
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sub run
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{
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my @err;
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# Local copy of targets so that it will re-check active every time
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my @t = $settings{targets} if (defined($settings{targets}));
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unless (scalar(@t)) {
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@t = get_active();
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push(@err, "No target outputs") unless (scalar(@t));
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}
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foreach my $a (@t) {
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my $image = choose_image($settings{path});
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if (defined($image)) {
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if ( -r "$image" ) {
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print "selected $image\n";
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my $cropped;
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if ($settings{crop}) {
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if ($settings{debug}) {
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print "Cropping image for '$a' using '$image'\n";
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}
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my ($ow, $oh) = get_size($a);
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$cropped = crop($image, $ow, $oh);
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unless ($cropped) {
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push(@err, "Failed to generate cropped image") unless ($cropped);
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next;
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}
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} else {
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$cropped = $image;
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}
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my $e = set_background($a,$cropped);
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push(@err, $e) if (defined($e));
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if ($settings{crop}) {
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print "Deleting $cropped\n";
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#unlink($cropped) || push(@err, "Failed to delete $cropped after setting: $!");
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}
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} else {
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push(@err, "$a: Unable to read image $image");
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}
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} else {
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push(@err, "$a: Unable to select image from $settings{path}");
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}
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}
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if ($settings{debug} && $settings{daemon}) {
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print STDERR join("\n",@err);
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} else {
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@e = @err;
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}
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}
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################################################################################
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# Collect arguments
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################################################################################
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my @targets;
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my $daemon;
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my $delay;
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my $crop;
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my $path;
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while (my $arg = shift(@ARGV)) {
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if ($arg eq '-h' || $arg eq '--help') {
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usage();
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@ -191,13 +246,13 @@ while (my $arg = shift(@ARGV)) {
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}
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}
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die "Invalid rotation delay: $delay" unless ($delay =~ m/^\d+$/);
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################################################################################
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# Validate arguments
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################################################################################
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if ($path) {
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die "Invalid wallpaper path '$path'. Not a directory." unless (-d $path);
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} else {
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$path = "$ENV{HOME}/wallpapers";
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}
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die "Invalid rotation delay: $delay" if (defined($delay) && $delay !~ m/^\d+$/);
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die "Invalid wallpaper path '$path'. Not a directory." if (defined($path) && !-d $path);
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if (scalar(@targets)) {
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my @kept;
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@ -216,72 +271,59 @@ if (scalar(@targets)) {
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@targets = @kept;
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}
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if ($daemon) {
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$settings{targets} = @targets || undef;
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$settings{daemon} = $daemon || 0;
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$settings{path} = $path || "$ENV{HOME}/wallpapers";
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$settings{crop} = $crop || 1;
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$settings{delay} = $delay || 300;
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$settings{debug} = $debug || 0;
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################################################################################
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# For if daemonized
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################################################################################
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if ($settings{daemon}) {
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my $p = fork();
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if ($p) {
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my $pidfile = "/var/run/$ENV{HOME}-wallpaper.pid";
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open(my $fh, ">", $pidfile) || die "Failed to open pidfile: $pidfile";
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print $fh "Daemonized as PID: $p\n" || die "Failed to write pid ($p) to pidfile $pidfile";
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if (open(my $fh, ">", $pidfile)) {
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print $fh "$p" || die "Failed to write pid ($p) to pidfile $pidfile";
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close($fh);
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} else {
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print "Failed to open pidfile: $pidfile: $!\n";
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}
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exit(0);
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}
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#setpgrp;
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#setsid;
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umask 0;
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# TODO: configure systemD logging
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}
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if ($debug) {
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print "Initial configuration:\n";
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print " Targets: ( " . ( join(" ",@targets) || "All active" ) . " )\n";
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print " Daemon: $daemon\n";
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print " Path: $path\n";
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}
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################################################################################
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# Main
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################################################################################
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my @e;
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do {
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my @err;
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# Local copy of targets so that it will re-check active every time
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my @t = @targets;
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unless (scalar(@t)) {
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@t = get_active();
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push(@err, "No target outputs") unless (scalar(@t));
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}
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foreach my $a (@t) {
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my $image = choose_image($path);
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if (defined($image)) {
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if ( -r "$image" ) {
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print "selected $image\n";
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my $cropped;
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if ($crop) {
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if ($debug) {
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print "Cropping image for '$a' using '$image'\n";
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}
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my ($ow, $oh) = get_size($a);
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$cropped = crop($image, $ow, $oh);
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unless ($cropped) {
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push(@err, "Failed to generate cropped image") unless ($cropped);
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next;
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}
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} else {
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$cropped = $image;
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}
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my $e = set_background($a,$cropped);
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push(@err, $e) if (defined($e));
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if ($crop) {
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print "Deleting $cropped\n";
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#unlink($cropped) || push(@err, "Failed to delete $cropped after setting: $!");
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}
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} else {
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push(@err, "$a: Unable to read image $image");
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}
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} else {
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push(@err, "$a: Unable to select image from $path");
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run(%settings);
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if ($settings{daemon}) {
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my $normal = "reload wallpaper";
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eval {
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$SIG{ALRM} = sub { print "$normal\n" };
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alarm $settings{delay};
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POSIX::pause();
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alarm 0;
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};
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if ($@ && $@ !~ quotemeta($normal)) {
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if ($settings{debug}) {
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print $normal;
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}
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}
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if ($debug && $daemon) {
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print STDERR join("\n",@err);
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sleep($delay);
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} else {
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@e = @err;
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}
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} while ($daemon);
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} while ($settings{daemon});
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################################################################################
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# If we made it to here, it was not daemonized. Output errors and exit
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################################################################################
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if (scalar(@e)) {
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die "Failure while not running as daemon:\n" .
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