add test case for deb-systemd-helper

1 files changed, 137 insertions, 0 deletions

diff --git a/t/001-deb-systemd-helper.t b/t/001-deb-systemd-helper.t
new file mode 100644
index 0000000..ed661c8
--- /dev/null
+++ b/t/001-deb-systemd-helper.t
@@ -0,0 +1,137 @@
+#!perl
+# vim:ts=4:sw=4:et
+
+use strict;
+use warnings;
+use Test::More;
+use File::Temp qw(tempfile tempdir); # in core since perl 5.6.1
+use File::Path qw(make_path); # in core since Perl 5.001
+use File::Basename; # in core since Perl 5
+use FindBin; # in core since Perl 5.00307
+use Linux::Clone; # neither in core nor in Debian :-/
+
+# ┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
+# ┃ SETUP: in a new mount namespace, bindmount tmpdirs on /etc/systemd and    ┃
+# ┃ /var/lib/systemd to start with clean directories yet use the actual       ┃
+# ┃ locations and code paths.                                                 ┃
+# ┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛
+
+my $dsh = "$FindBin::Bin/../script/deb-systemd-helper";
+
+sub _unit_enabled {
+    my ($unit_file, $cb, $verb) = @_;
+
+    my $retval = system("DPKG_MAINTSCRIPT_PACKAGE=test $dsh is-enabled $unit_file");
+    isnt($retval, -1, 'deb-systemd-helper could be executed');
+    ok(!($retval & 127), 'deb-systemd-helper did not exit due to a signal');
+    $cb->($retval >> 8, 0, "random unit file $verb enabled");
+}
+
+sub is_enabled { _unit_enabled($_[0], \&is, 'is') }
+sub isnt_enabled { _unit_enabled($_[0], \&isnt, 'isnt') }
+
+my $retval = Linux::Clone::unshare Linux::Clone::NEWNS;
+BAIL_OUT("Cannot unshare(NEWNS): $!") if $retval != 0;
+
+sub bind_mount_tmp {
+    my ($dir) = @_;
+    my $tmp = tempdir(CLEANUP => 1);
+    system("mount -n --bind $tmp $dir") == 0
+        or BAIL_OUT("bind-mounting $tmp to $dir failed: $!");
+    return $tmp;
+}
+
+my $etc_systemd = bind_mount_tmp('/etc/systemd');
+my $lib_systemd = bind_mount_tmp('/lib/systemd');
+my $var_lib_systemd = bind_mount_tmp('/var/lib/systemd');
+
+# ┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
+# ┃ Verify “is-enabled” is not true for a random, non-existing unit file.     ┃
+# ┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛
+
+my ($fh, $random_unit) = tempfile('unitXXXXX',
+    SUFFIX => '.service',
+    TMPDIR => 1,
+    UNLINK => 1);
+close($fh);
+$random_unit = basename($random_unit);
+
+isnt_enabled($random_unit);
+
+# ┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
+# ┃ Verify “is-enabled” is not true for a random, existing unit file.         ┃
+# ┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛
+
+my $servicefile_path = "/lib/systemd/system/$random_unit";
+make_path('/lib/systemd/system');
+open($fh, '>', $servicefile_path);
+print $fh <<'EOT';
+[Unit]
+Description=test unit
+
+[Service]
+ExecStart=/bin/sleep 1
+
+[Install]
+WantedBy=multi-user.target
+EOT
+close($fh);
+
+isnt_enabled($random_unit);
+
+# ┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
+# ┃ Verify “enable” creates the requested symlinks.                           ┃
+# ┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛
+
+ok(! -d '/etc/systemd/system/multi-user.target.wants',
+    'multi-user.target.wants does not exist yet');
+
+$retval = system("DPKG_MAINTSCRIPT_PACKAGE=test $dsh enable $random_unit");
+my $symlink_path = "/etc/systemd/system/multi-user.target.wants/$random_unit";
+ok(-l $symlink_path, "$random_unit was enabled");
+is(readlink($symlink_path), $servicefile_path,
+    "symlink points to $servicefile_path");
+
+# ┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
+# ┃ Verify “is-enabled” now returns true.                                     ┃
+# ┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛
+
+is_enabled($random_unit);
+
+# ┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
+# ┃ Verify deleting the symlinks and running “enable” again does not          ┃
+# ┃ re-create the symlinks.                                                   ┃
+# ┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛
+
+unlink($symlink_path);
+ok(! -l $symlink_path, 'symlink deleted');
+isnt_enabled($random_unit);
+
+$retval = system("DPKG_MAINTSCRIPT_PACKAGE=test $dsh enable $random_unit");
+
+isnt_enabled($random_unit);
+
+# ┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
+# ┃ Verify “disable” when purging deletes the statefile.                      ┃
+# ┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛
+
+my $statefile = "/var/lib/systemd/deb-systemd-helper-enabled/$random_unit.dsh-also";
+
+ok(-f $statefile, 'state file exists');
+
+$retval = system("DPKG_MAINTSCRIPT_PACKAGE=test _DEB_SYSTEMD_HELPER_PURGE=1 $dsh disable $random_unit");
+
+ok(! -f $statefile, 'state file does not exist anymore after purging');
+
+# ┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
+# ┃ Verify “enable” after purging does re-create the symlinks.                ┃
+# ┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛
+
+ok(! -l $symlink_path, 'symlink does not exist yet');
+isnt_enabled($random_unit);
+
+$retval = system("DPKG_MAINTSCRIPT_PACKAGE=test $dsh enable $random_unit");
+
+is_enabled($random_unit);
+
+done_testing;