Introduce new binary package 'runit-helper', allowing packages to access fixes and improvements in 'dh-runit' without rebuild.

1 files changed, 66 insertions, 0 deletions

diff --git a/runit-helper b/runit-helper
new file mode 100755
index 0000000..e48020b
--- /dev/null
+++ b/runit-helper
@@ -0,0 +1,66 @@
+#!/bin/sh
+# Copyright (C) 2017 Dmitry Bogatov <KAction@gnu.org>
+
+# Author: Dmitry Bogatov <KAction@gnu.org>
+
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 3
+# of the License, or (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+set -e
+
+postrm () {
+
+        # Following code makes sure, that after removal of package, in default
+        # setup, the only files belonged to log user, belong to root.
+        #
+        # This way user can be safely removed, solving part of #848239 (need
+        # interoperation from dh-sysuser).
+        #
+        # Sure, system administrator can make stupid thing and chown some file
+        # to log user, but consequences do not seem to be so severe. After
+        # all, with great power comes great responsibility.
+        if [ -d "/var/log/runit/$NAME" ] ; then
+                chown --recursive root:root "/var/log/runit/$NAME"
+        fi
+
+        if [ "$1" != 'purge' ] ; then
+                return
+        fi
+
+        # If runscript was never invoked, there will be no files
+        # in this directory, and `dpkg' will remove it. In this case,
+        # we have nothing to do.
+        for supervise in "/var/lib/runit/supervise/$NAME" \
+                             "/var/lib/runit/log/supervise/$NAME" ; do
+                if [ -d "$supervise" ] ; then
+
+                        # Actually only `down' may be absent, but it does not
+                        # matter.
+
+                        for file in control lock ok pid stat status down ; do
+                                rm -f "$supervise/$file"
+                        done
+
+                        # It should be empty now. If it is not, it means that
+                        # system administrator put something there. It is very
+                        # stupid, but will of user is sacred, and directory is
+                        # left as-is in such case.
+                        #
+                        # NOTE: Non-POSIX option is used. The day coreutils will
+                        # no longer be essential, it will require a fix.
+                        rmdir --ignore-fail-on-non-empty "$supervise"
+                fi
+        done
+}
+
+"$@"