schedule interrupted cache update for the next boot, instead of blocking system reboot/shutdown

- resolves #1678464

man-db-cache-update.service

@@ -1,14 +1,11 @@
 [Unit]
-DefaultDependencies=no
 After=local-fs.target
-Before=reboot.target shutdown.target halt.target
-JobTimeoutSec=15min
 
 [Service]
 Type=oneshot
-TimeoutStartSec=infinity
 Environment=MAN_NO_LOCALE_WARNING=1
 EnvironmentFile=/etc/sysconfig/man-db
 ExecStart=/bin/sh -c '[ "$SERVICE" != "no" ] && /usr/bin/mandb $OPTS || true'
+ExecStopPost=/bin/sh -c '[ "$SERVICE_RESULT" == "signal" ] && /usr/bin/systemctl enable man-db-restart-cache-update.service || true'
 Nice=19
 IOWeight=20

man-db-restart-cache-update.service

@@ -0,0 +1,11 @@
+[Unit]
+Before=multi-user.target
+
+[Service]
+Type=oneshot
+ExecStartPre=/usr/bin/rm -rf /var/cache/man/*
+ExecStart=/usr/bin/systemd-run /usr/bin/systemctl start man-db-cache-update.service
+ExecStartPost=/usr/bin/systemctl disable man-db-restart-cache-update.service
+
+[Install]
+WantedBy=multi-user.target

man-db.spec

@@ -4,7 +4,7 @@
 Summary: Tools for searching and reading man pages
 Name: man-db
 Version: 2.8.7
-Release: 1%{?dist}
+Release: 2%{?dist}
 # GPLv2+ .. man-db
 # GPLv3+ .. gnulib
 License: GPLv2+ and GPLv3+
@@ -14,6 +14,7 @@ Source0: http://download.savannah.gnu.org/releases/%{name}/%{name}-%{version}.ta
 Source1: man-db.crondaily
 Source2: man-db.sysconfig
 Source3: man-db-cache-update.service
+Source4: man-db-restart-cache-update.service
 Patch0: man-db-2.8.3-change-owner-of-man-cache.patch
 
 # http://lists.nongnu.org/archive/html/man-db-devel/2017-01/msg00013.html
@@ -91,8 +92,9 @@ install -D -p -m 0644 %{SOURCE2} $RPM_BUILD_ROOT%{_sysconfdir}/sysconfig/man-db
 # config for tmpfiles.d
 install -D -p -m 0644 init/systemd/man-db.conf $RPM_BUILD_ROOT/usr/lib/tmpfiles.d/.
 
-# man-db-cache-update.service
+# man-db-cache-update.service and man-db-restart-cache-update.service
 install -D -p -m 0644 %{SOURCE3} $RPM_BUILD_ROOT%{_unitdir}/man-db-cache-update.service
+install -D -p -m 0644 %{SOURCE4} $RPM_BUILD_ROOT%{_unitdir}/man-db-restart-cache-update.service
 
 %find_lang %{name}
 %find_lang %{name}-gnulib
@@ -131,6 +133,7 @@ fi
 %config(noreplace) %{_sysconfdir}/sysconfig/man-db
 %config(noreplace) %{_tmpfilesdir}/man-db.conf
 %{_unitdir}/man-db-cache-update.service
+%{_unitdir}/man-db-restart-cache-update.service
 %{_sbindir}/accessdb
 %{_bindir}/man
 %{_bindir}/whatis
@@ -178,6 +181,11 @@ fi
 %config(noreplace) %{_sysconfdir}/cron.daily/man-db.cron
 
 %changelog
+* Fri Sep 27 2019 Nikola Forró <nforro@redhat.com> - 2.8.7-2
+- schedule interrupted cache update for the next boot, instead of blocking
+  system reboot/shutdown
+  resolves #1678464
+
 * Fri Aug 30 2019 Nikola Forró <nforro@redhat.com> - 2.8.7-1
 - update to 2.8.7
   resolves #1747042