add socket activation support for saned (#1091566)

sane-backends.spec

@@ -41,6 +41,8 @@ License: GPLv2+ and GPLv2+ with exceptions and Public Domain
 # Alioth Download URLs are amazing.
 Source0: https://alioth.debian.org/frs/download.php/latestfile/176/sane-backends-%{version}.tar.gz
 Source1: sane.png
+Source2: saned.socket
+Source3: saned@.service.in
 
 # Fedora-specific, probably not generally applicable:
 Patch0: sane-backends-1.0.25-udev.patch
@@ -64,6 +66,8 @@ BuildRequires: libtiff-devel
 BuildRequires: libv4l-devel
 BuildRequires: gettext
 BuildRequires: gphoto2-devel
+BuildRequires: systemd-devel
+BuildRequires: systemd
 Requires: systemd >= 196
 Requires: sane-backends-libs%{?_isa} = %{?epoch:%{epoch}:}%{version}-%{release}
 # Don't drag around obsoletes forever
@@ -155,6 +159,8 @@ This package contains backend drivers to access digital cameras through SANE.
 Summary: Scanner network daemon
 Requires: sane-backends = %{?epoch:%{epoch}:}%{version}-%{release}
 Requires: sane-backends-libs%{?_isa} = %{?epoch:%{epoch}:}%{version}-%{release}
+Requires(pre): shadow-utils
+%{?systemd_requires}
 # Split off saned from 1.0.25-3 on, don't drag around obsoletes forever
 %if ! (0%{?fedora} >= 27 || 0%{?rhel} >= 8)
 Obsoletes: sane-backends < 1.0.25-3
@@ -183,6 +189,7 @@ LDFLAGS="-pie"
 %configure \
     --with-gphoto2=%{_prefix} \
     --with-docdir=%{_maindocdir} \
+    --with-systemd \
     --disable-locking --disable-rpath \
 %if %libusb1
     --enable-libusb_1_0 \
@@ -236,6 +243,11 @@ for f in *; do
 done
 popd
 
+install -m 755 -d %{buildroot}%{_unitdir}
+install -m 644 %{SOURCE2} %{buildroot}%{_unitdir}
+sed 's|@CONFIGDIR@|%{_sysconfdir}/sane.d|g' < %{SOURCE3} > saned@.service
+install -m 644 saned@.service %{buildroot}%{_unitdir}
+
 %find_lang %name
 
 %post
@@ -247,6 +259,18 @@ udevadm hwdb --update >/dev/null 2>&1 || :
 %post libs -p /sbin/ldconfig
 %postun libs -p /sbin/ldconfig
 
+%pre daemon
+getent group GROUPNAME >/dev/null || groupadd -r GROUPNAME
+
+%post daemon
+%systemd_post saned.socket
+
+%preun daemon
+%systemd_preun saned.socket
+
+%postun daemon
+%systemd_postun saned.socket
+
 %files -f %{name}.lang
 %docdir %{_maindocdir}
 %doc %{_maindocdir}/AUTHORS
@@ -294,12 +318,15 @@ udevadm hwdb --update >/dev/null 2>&1 || :
 
 %files daemon
 %{_sbindir}/saned
+%{_unitdir}/saned.socket
+%{_unitdir}/saned@.service
 
 %changelog
 * Fri Oct 07 2016 Nils Philippsen <nils@redhat.com>
 - use %%license for license files
 - remove some obsolete cruft from the spec file
 - split off saned into daemon subpackage
+- add socket activation support for saned (#1091566)
 
 * Thu Feb 04 2016 Fedora Release Engineering <releng@fedoraproject.org> - 1.0.25-2
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_24_Mass_Rebuild

saned.socket

@@ -0,0 +1,10 @@
+[Unit]
+Description=saned incoming socket
+
+[Socket]
+ListenStream=6566
+Accept=yes
+MaxConnections=1
+
+[Install]
+WantedBy=sockets.target

saned@.service.in

@@ -0,0 +1,18 @@
+[Unit]
+Description=Scanner Service
+Requires=saned.socket
+
+[Service]
+ExecStart=/usr/sbin/saned
+User=saned
+Group=saned
+StandardInput=null
+StandardOutput=syslog
+StandardError=syslog
+Environment=SANE_CONFIG_DIR=@CONFIGDIR@
+# If you need to debug your configuration uncomment the next line and
+# change it as appropriate to set the desired debug options
+# Environment=SANE_DEBUG_DLL=255 SANE_DEBUG_NET=255
+
+[Install]
+Also=saned.socket