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Diffstat (limited to 'dh_installsystemduser')
| -rwxr-xr-x | dh_installsystemduser | 288 |
1 files changed, 288 insertions, 0 deletions
diff --git a/dh_installsystemduser b/dh_installsystemduser new file mode 100755 index 0000000..27e96e5 --- /dev/null +++ b/dh_installsystemduser @@ -0,0 +1,288 @@ +#!/usr/bin/perl -w + +=head1 NAME + +dh_installsystemduser - install systemd unit files + +=cut + +use strict; +use warnings; +use Debian::Debhelper::Dh_Lib; + +our $VERSION = DH_BUILTIN_VERSION; + +=head1 SYNOPSIS + +B<dh_installsystemduser> [S<I<debhelper options>>] [B<--no-enable>] [B<--name=>I<name>] [S<I<unit file> ...>] + +=head1 DESCRIPTION + +B<dh_installsystemduser> finds the systemd user instance service files +installed by a package and generates F<preinst>, F<postinst>, and F<prerm> +code blocks for enabling, disabling, starting, stopping, and restarting the +corresponding systemd user instance services, when the package is installed, +updated, or removed. These snippets are added to the maintainer scripts by +L<dh_installdeb(1)>. + +L<deb-systemd-helper(1)> is used to enable and disable the systemd +units, thus it is not necessary that the machine actually runs systemd +during package installation time, enabling happens on all machines. + +B<dh_installsystemduser> operates on all user instance unit files +installed by a package. For only generating blocks for specific unit +files, pass them as arguments. Specific unit files can be excluded +from processing using the B<-X> common L<debhelper(1)> option. + +=head1 FILES + +=over 4 + +=item debian/I<package>.user.path, + debian/I<package>@.user.path, + debian/I<package>.user.service, + debian/I<package>@.user.service, + debian/I<package>.user.socket, + debian/I<package>@.user.socket, + debian/I<package>.user.target, + debian/I<package>@.user.target, + debian/I<package>.user.timer, + debian/I<package>@.user.timer + +If any of those files exists, they are installed into +F<usr/lib/systemd/user/> in the package build directory removing the +F<.user> file name part. + +=back + +=head1 OPTIONS + +=over 4 + +=item B<--name=>I<name> + +Install the service file as I<name.service> instead of the default +filename I<package.service>. When this parameter is used, +B<dh_installsystemd> looks for and installs files named +F<debian/package.name.user.service> instead of the usual +F<debian/package.user.service>. Moreover, maintainer scripts are only +generated for units that match the given I<name>. + +=item B<--no-enable> + +Disable the service(s) on purge, but do not enable them on install. + +=back + +=head1 NOTES + +This command is not idempotent. L<dh_prep(1)> should be called between +invocations of this command (with the same arguments). Otherwise, it +may cause multiple instances of the same text to be added to +maintainer scripts. + +=cut + +# PROMISE: DH NOOP WITHOUT internal(bug#950723) tmp(usr/lib/systemd/user) user.service user.target user.socket user.path user.timer + +init(options => { + "no-enable" => \$dh{NO_ENABLE}, +}); + +sub quote { + # Add single quotes around the argument. + return '\'' . $_[0] . '\''; +} + +sub uniq { + my %seen; + return grep { !$seen{$_}++ } @_; +} + +sub contains_install_section { + my ($unit_path) = @_; + + open(my $fh, '<', $unit_path) or error("Cannot open($unit_path) to check for [Install]: $!"); + + while (my $line = <$fh>) { + chomp($line); + return 1 if $line =~ /^\s*\[Install\]$/i; + } + close($fh); + return 0; +} + +sub install_user_unit { + my ($package, $name, $suffix, $path) = @_; + my $unit = pkgfile($package, "user.$suffix"); + return if $unit eq ''; + + install_dir($path); + install_file($unit, "$path/$name.$suffix"); +} + +# Extracts the directive values from a unit file. Handles repeated +# directives in the same unit file. Assumes values can only be +# composed of lists of unit names. This is good enough for the 'Also=' +# and 'Alias=' directives handled here. +sub extract_key { + my ($unit_path, $key) = @_; + my @values; + + open(my $fh, '<', $unit_path) or error("Cannot open($unit_path): $!"); + + while (my $line = <$fh>) { + chomp($line); + + # Since unit names can't have whitespace in systemd, simply + # use split and strip any leading/trailing quotes. See + # systemd-escape(1) for examples of valid unit names. + if ($line =~ /^\s*$key=(.+)$/i) { + for my $value (split(/\s+/, $1)) { + $value =~ s/^(["'])(.*)\g1$/$2/; + push @values, $value; + } + } + } + + close($fh); + return @values; +} + +sub list_installed_user_units { + my ($tmpdir, $aliases) = @_; + + my $lib_systemd_user = "$tmpdir/usr/lib/systemd/user"; + my @installed; + + return unless -d $lib_systemd_user; + opendir(my $dh, $lib_systemd_user) or error("Cannot opendir($lib_systemd_user): $!"); + + foreach my $name (readdir($dh)) { + my $path = "$lib_systemd_user/$name"; + next unless -f $path; + if (-l $path) { + my $dest = basename(readlink($path)); + $aliases->{$dest} //= [ ]; + push @{$aliases->{$dest}}, $name; + } else { + push @installed, $name; + } + } + + closedir($dh); + return @installed; +} + +# Install package maintainer provided unit files. +foreach my $package (@{$dh{DOPACKAGES}}) { + my $tmpdir = tmpdir($package); + + # unit file name + my $name = $dh{NAME} // $package; + + my $path = "$tmpdir/usr/lib/systemd/user"; + for my $type (qw(service target socket path timer)) { + install_user_unit($package, $name, $type, $path); + install_user_unit("${package}@", "${name}@", $type, $path); + } +} + +# Generate postinst and prerm code blocks to enable and disable units +foreach my $package (@{$dh{DOPACKAGES}}) { + my (@args, @start_units, @enable_units, %aliases); + + my $tmpdir = tmpdir($package); + my @units = list_installed_user_units($tmpdir, \%aliases); + + # Handle either only the unit files which were passed as arguments + # or all unit files that are installed in this package. + if (@ARGV) { + @args = @ARGV; + } + elsif ($dh{NAME}) { + # Treat --name flag as if the corresponding units were passed + # in the command line. + @args = grep /(^|\/)$dh{NAME}\.(service|target|socket|path|timer)$/, @units; + } + else { + @args = @units; + } + + # Support excluding units via the -X debhelper common option. + foreach my $x (@{$dh{EXCLUDE}}) { + @args = grep !/(^|\/)$x$/, @args; + } + + # This hash prevents us from looping forever in the following + # while loop. An actual real-world example of such a loop is + # systemd's systemd-readahead-drop.service, which contains + # Also=systemd-readahead-collect.service, and that file in turn + # contains Also=systemd-readahead-drop.service, thus forming an + # endless loop. + my %seen; + + # Must use while and shift because the loop alters the list. + while (@args) { + my $name = shift @args; + my $path = "${tmpdir}/usr/lib/systemd/user/${name}"; + + error("User unit file \"$name\" not found in package \"$package\".") if ! -f $path; + + # Skip template service files. Enabling or disabling those + # services without specifying the instance is not useful. + next if ($name =~ /\@/); + + # Handle all unit files specified via Also= explicitly. This + # is not necessary for enabling, but for disabling, as we + # cannot read the unit file when disabling as it has already + # been deleted. + push @args, $_ for grep { !$seen{$_}++ } extract_key($path, 'Also'); + + push @enable_units, $name if contains_install_section($path); + push @start_units, $name; + } + + @enable_units = map { quote($_) } sort(uniq(@enable_units)); + @start_units = map { quote($_) } sort(uniq(@start_units)); + + if (@enable_units) { + # The generated maintainer script code blocks use the --user + # option that was added to deb-systemd-helper in version 1.52. + addsubstvar($package, 'misc:Depends', 'init-system-helpers', ">= 1.52"); + + my $postinst = $dh{NO_ENABLE} ? 'postinst-systemd-user-dont-enable' : 'postinst-systemd-user-enable'; + foreach my $unit (@enable_units) { + autoscript($package, 'postinst', $postinst, { 'UNITFILE' => $unit }); + } + autoscript($package, 'postrm', 'postrm-systemd-user', { 'UNITFILES' => join(' ', @enable_units) }); + } + + if (@start_units and not compat(13)) { + # The generated maintainer script code blocks use the --user + # option that was added to deb-systemd-invoke in version 1.61 and fixed in 1.66 to really daemon-reload. + addsubstvar($package, 'misc:Depends', 'init-system-helpers', ">= 1.66~"); + + my %options = ('snippet-order' => 'service'); + + # restart service after install/upgrade + autoscript($package, 'postinst', 'postinst-systemd-user-restart', { 'UNITFILES' => join(' ', @start_units) }, \%options); + + # stop service after removal + autoscript($package, 'prerm', 'prerm-systemd-user-stop', { 'UNITFILES' => join(' ', @start_units) }, \%options); + + # Run this with "default" order so it is always after other + # service related autosnippets. + autoscript($package, 'postrm', 'postrm-systemd-user-reload-only', { 'UNITFILES' => join(' ', @start_units) }); + } +} + +=head1 SEE ALSO + +L<debhelper(7)>, L<dh_installsystemd(1)>, L<deb-systemd-helper(1)> + +=head1 AUTHORS + +pkg-systemd-maintainers@lists.alioth.debian.org + +=cut |