linux-ext4 - [PATCH 1/9] e2scrub: check to make sure lvm2 is installed

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Message-Id: <20190321202513.1969-2-tytso@mit.edu>
Date:   Thu, 21 Mar 2019 16:25:05 -0400
From:   "Theodore Ts'o" <tytso@....edu>
To:     Ext4 Developers List <linux-ext4@...r.kernel.org>
Cc:     darrick.wong@...cle.com, lczerner@...hat.com,
        "Theodore Ts'o" <tytso@....edu>
Subject: [PATCH 1/9] e2scrub: check to make sure lvm2 is installed

Not all systems will have the lvm2 package installed, so check for
that.  Pretty much all systems should have util-linux installed, but
check for that as well.

Of course, if lvm2 is installed we shouldn't find any LVM devices ---
but eventually the Demon Murphy will find a way to make it happen. :-)

Also, set the PATH so we don't have to worry about the script failing
due to /sbin not being in the path.

Signed-off-by: Theodore Ts'o <tytso@....edu>
---
 scrub/e2scrub.in     | 12 ++++++++++++
 scrub/e2scrub_all.in | 16 ++++++++++++++++
 2 files changed, 28 insertions(+)

diff --git a/scrub/e2scrub.in b/scrub/e2scrub.in
index e1965db4e..51a909373 100644
--- a/scrub/e2scrub.in
+++ b/scrub/e2scrub.in
@@ -23,6 +23,8 @@
 # check filesystems in VGs that have at least 256MB (or so) of
 # free space.
 
+PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
+
 snap_size_mb=256
 fstrim=0
 reap=0
@@ -82,6 +84,16 @@ if [ -z "${arg}" ]; then
 	exitcode 1
 fi
 
+if ! type lsblk >& /dev/null ; then
+    echo "e2scrub: can't find lsblk --- is util-linux installed?"
+    exitcode 1
+fi
+
+if ! type lvcreate >& /dev/null ; then
+    echo "e2scrub: can't find lvcreate --- is lvm2 installed?"
+    exitcode 1
+fi
+
 # Find the device for a given mountpoint
 dev_from_mount() {
 	local mountpt="$(realpath "$1")"
diff --git a/scrub/e2scrub_all.in b/scrub/e2scrub_all.in
index 23d122d25..d725a7f2e 100644
--- a/scrub/e2scrub_all.in
+++ b/scrub/e2scrub_all.in
@@ -18,6 +18,8 @@
 #  along with this program; if not, write the Free Software Foundation,
 #  Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA.
 
+PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
+
 scrub_all=0
 conffile="@root_sysconfdir@...scrub.conf"
 
@@ -68,6 +70,20 @@ while getopts "ArV" opt; do
 done
 shift "$((OPTIND - 1))"
 
+# If some prerequisite packages are not installed, exit with a code
+# indicating success to avoid spamming the sysadmin with fail messages
+# when e2scrub_all is run out of cron or a systemd timer.
+
+if ! type lsblk >& /dev/null ; then
+    echo "e2scrub_all: can't find lsblk --- is util-linux installed?"
+    exitcode 0
+fi
+
+if ! type lvcreate >& /dev/null ; then
+    echo "e2scrub_all: can't find lvcreate --- is lvm2 installed?"
+    exitcode 0
+fi
+
 # Find scrub targets, make sure we only do this once.
 ls_scrub_targets() {
 	lsblk -o NAME,FSTYPE,MOUNTPOINT -p -P -n | while read vars; do
-- 
2.19.1