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Date:   Wed, 20 Mar 2019 20:55:30 -0700
From:   "Darrick J. Wong" <darrick.wong@...cle.com>
To:     "Theodore Ts'o" <tytso@....edu>
Cc:     Ext4 Developers List <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH 1/9] e2scrub: check to make sure lvm2 is installed

On Wed, Mar 20, 2019 at 10:02:10PM -0400, Theodore Ts'o wrote:
> 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>

Looks ok,
Reviewed-by: Darrick J. Wong <darrick.wong@...cle.com>

--D

> ---
>  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
> 

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