contrib: adding checkupdates

Signed-off-by: Kyle Keen <keenerd@gmail.com>

[Allan: update contrib/README]
Signed-off-by: Allan McRae <allan@archlinux.org>

3 files changed, 50 insertions, 0 deletions

diff --git a/contrib/Makefile.am b/contrib/Makefile.am
index 64f476c9..99baf951 100644
--- a/contrib/Makefile.am
+++ b/contrib/Makefile.am
@@ -6,6 +6,7 @@ bin_SCRIPTS = \
 
 BASHSCRIPTS = \
 	bacman \
+	checkupdates \
 	paccache \
 	pacdiff \
 	paclist \
@@ -30,6 +31,7 @@ EXTRA_DIST = \
 	PKGBUILD.vim \
 	bacman.sh.in \
 	bash_completion.in \
+	checkupdates.sh.in \
 	paccache.sh.in \
 	paclog-pkglist.sh.in \
 	pacdiff.sh.in \
@@ -93,6 +95,7 @@ uninstall-local:
 
 bacman: $(srcdir)/bacman.sh.in
 bash_completion: $(srcdir)/bash_completion.in
+checkupdates: $(srcdir)/checkupdates.sh.in
 paccache: $(srcdir)/paccache.sh.in $(top_srcdir)/scripts/library/parseopts.sh $(top_srcdir)/scripts/library/size_to_human.sh
 pacdiff: $(srcdir)/pacdiff.sh.in
 paclist: $(srcdir)/paclist.sh.in
diff --git a/contrib/README b/contrib/README
index b9f65248..ae33bb25 100644
--- a/contrib/README
+++ b/contrib/README
@@ -10,6 +10,9 @@ database entries. Useful for reuse, or possible config file extension.
 bash_completion - a bash completion script for pacman, install in
 /etc/bash_completion.d/ for use (but rename to something descriptive!).
 
+checkupdates - print a list of pending updates without touching the system
+sync databases (for safety on rolling release distributions).
+
 paccache - a flexible package cache cleaning utility that allows greater
 control over which packages are removed.
 
diff --git a/contrib/checkupdates.sh.in b/contrib/checkupdates.sh.in
new file mode 100644
index 00000000..15950e13
--- /dev/null
+++ b/contrib/checkupdates.sh.in
@@ -0,0 +1,44 @@
+#!/bin/bash
+#
+#   checkupdates: Safely print a list of pending updates.
+#
+#   Copyright (c) 2013 Kyle Keen <keenerd@gmail.com>
+#
+#   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 2 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/>.
+#
+
+if (( $# > 0 )); then
+	echo "checkupdate: Safely print a list of pending updates."
+	echo "Use: checkupdates"
+	echo "Export the 'CHECKUPDATE_DB' variable to change the path of the temporary database."
+	exit 0
+fi
+
+if [[ -z $CHECKUPDATE_DB ]]; then
+	CHECKUPDATE_DB="${TMPDIR:-/tmp}/checkup-db-${USER}/"
+fi
+
+trap 'rm -f $CHECKUPDATE_DB/db.lck' INT TERM EXIT
+
+DBPath="${DBPath:-@localstatedir@/lib/pacman/}"
+eval $(awk -F' *= *' '$1 ~ /DBPath/ { print $1 "=" $2 }' /etc/pacman.conf)
+
+mkdir -p "$CHECKUPDATE_DB"
+ln -s "${DBPath}/local" "$CHECKUPDATE_DB" &> /dev/null
+fakeroot pacman -Sy --dbpath "$CHECKUPDATE_DB" &> /dev/null
+pacman -Qqu --dbpath "$CHECKUPDATE_DB" 2> /dev/null
+
+exit 0
+
+# vim: set ts=2 sw=2 noet: