Add pacman-syncdb: systemd service and timer for `pacman -Fy`.

`pacman -Fy` is a modern replacement for `pkgfile`[1].

This service/timer makes `pacman -Fy` have feature parity with
`pkgfile`.

The unit files were based on both pkgfile and paccache, for consistency
with the existing ecosystem.

Context: https://bbs.archlinux.org/viewtopic.php?pid=1981076

[1]: https://wiki.archlinux.org/title/Pacman#Search_for_a_package_that_contains_a_specific_file

Signed-off-by: Thiago Perrotta <tbperrotta@gmail.com>
Signed-off-by: Daniel M. Capella <polyzen@archlinux.org>

CHANGES.md

@@ -6,6 +6,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [Unreleased]
 ### Added
+- pacman-syncdb: systemd service and timer for `pacman -Fy` (https://bbs.archlinux.org/viewtopic.php?pid=1981076)
 
 ### Changed
 

src/Makefile.am

@@ -30,7 +30,8 @@ vim_syntax__DATA = \
 systemd_dir = ${libdir}/systemd/system
 
 systemd__DATA = \
-	paccache.service paccache.timer
+	paccache.service paccache.timer \
+	pacman-syncdb.service pacman-syncdb.timer
 
 BASHSCRIPTS = \
 	checkupdates \
@@ -50,7 +51,8 @@ OURSCRIPTS = \
 	$(PERLSCRIPTS)
 
 OURFILES = \
-	paccache.service
+	paccache.service \
+	pacman-syncdb.service
 
 EXTRA_DIST = \
 	checkupdates.sh.in \
@@ -60,6 +62,8 @@ EXTRA_DIST = \
 	pacdiff.sh.in \
 	paclist.sh.in \
 	paclog-pkglist.sh.in \
+	pacman-syncdb.service.in \
+	pacman-syncdb.timer \
 	pacscripts.sh.in \
 	pacsearch.pl.in \
 	pacsort.c \

src/pacman-syncdb.service.in

+[Unit]
+Description=Download pacman fresh files databases from the server
+RequiresMountsFor="/var/lib/pacman/sync"
+After=network-online.target nss-lookup.target
+Wants=network-online.target
+
+[Service]
+Type=oneshot
+ExecStart=@bindir@/pacman -Fy
+Nice=19
+StandardOutput=null
+StandardError=journal

src/pacman-syncdb.timer

+[Unit]
+Description=Download pacman fresh files databases from the server weekly
+
+[Timer]
+OnCalendar=weekly
+AccuracySec=1h
+Persistent=true
+
+[Install]
+WantedBy=timers.target