2 files changed, 25 insertions, 8 deletions

diff --git a/debian/changelog b/debian/changelog
index 28bf913..3d0147a 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -2,6 +2,9 @@ dh-runit (0.4) UNRELEASED; urgency=medium
 
   * Fix bug, that caused dh-runit to attemt to create directory
     under /.
+  * Fix postrm script. Previously, it halted purge with errors about
+    missing supervise directory. Indeed, if service was never started,
+    it's supervise directory is empty and removed by dpkg.
 
  -- Dmitry Bogatov <KAction@gnu.org>  Thu, 28 Jul 2016 15:36:43 +0300
 
diff --git a/postrm-runit b/postrm-runit
index 3e3d76d..d07049c 100644
--- a/postrm-runit
+++ b/postrm-runit
@@ -1,14 +1,28 @@
 # -*- shell-script -*-
 
 if [ "$1" = 'purge' ] ; then
-    # If runscript was never invoked, these files would not exist,
-    # so we use -f option of rm(1).
-   for file in control lock ok pid stat status ; do
-       rm -f "/var/lib/runit/supervise/#NAME#/$file"
-   done
-   # It should exist and be empty now. If it is not, either user touched it,
-   # or there is a BUG in dh-runit!
-   rmdir "/var/lib/runit/supervise/#NAME#"
+    # 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.
+    supervise_dir="/var/lib/runit/supervise/#NAME#"
+    if [ -d "$supervise_dir" ] ; then
+
+        # Actually only `down' may be absent, but it does not
+        # matter.
+
+        for file in control lock ok pid stat status down ; do
+            rm -f "$supervise_dir/$file"
+        done
+
+        # It should be empty now. If it is not, it means that system administrator put
+        # something there. It is very stupid, but will of user is sacred, and directory
+        # is left as-is in such case.
+        #
+        # NOTE: Non-POSIX option is used. The day coreutils will no longer be essential,
+        # it will require a fix.
+        rmdir --ignore-fail-on-nonempty "$supervise_dir"
+    fi
+    unset supervise_dir
 fi
 
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