btrfs scrub: script and systemd timers to run weekly and send mails using gmail via curl + netrc

.netrc

machine smtp.gmail.com
login user@gmail.com
password my-app-password

README.md

installing systemd services + timers

systemctl daemon-reload systemctl enable btrfs-scrub.service systemctl enable btrfs-scrub.timer systemctl start btrfs-scrub.timer

chmod 600 /root/.netrc

apt-get install curl (if you are inside a in container)

btrfs-scrub

#! /bin/bash
#######################################################
# This is a helper script to be used in a systemd timer
# or cron job to scrub all mounted btrfs filessytems
#
# $Author: gbrks
# $Revision 0.1
# $Date: 2015.05.15
#
# Update email address below

EMAIL_SUBJECT_PREFIX="$HOSTNAME BTRFS - "
EMAIL_ADDRESS="<email@address>"

LOG_FILE="/var/log/btrfs-scrub.log"

TMP_OUTPUT="/tmp/btrfs-scrub.$$.out"
# redirect all stdout to log gile
exec >> $LOG_FILE
echo "[`date -Iseconds`] btrfs scrub job started."

# mail header to the file
echo "From: "My Name" <$EMAIL_ADDRESS>" > $TMP_OUTPUT
echo "To: "My Name" <$EMAIL_ADDRESS>" >> $TMP_OUTPUT
echo "Subject: $EMAIL_SUBJECT_PREFIX Scrub Job Completed" >> $TMP_OUTPUT
echo "" >> "$TMP_OUTPUT"
# timestamp the job
echo "[`date -Iseconds`] btrfs scrub job started."
echo "btrfs scrub job started on `date -Iseconds`" >> $TMP_OUTPUT
echo "----------------------------------------" >> $TMP_OUTPUT

# for each btrfs type system mounted, scrub and record output
while read d m t x
do
  [[ $t != "btrfs" ]] && continue
  echo "scrubbing $m" >> $TMP_OUTPUT
  echo "[`date -Iseconds`] scrubbing $m"
  btrfs scrub start -Bd $m >> $TMP_OUTPUT
  echo "" >> $TMP_OUTPUT
done </proc/mounts

echo "----------------------------------------" >> $TMP_OUTPUT
echo "btrfs scrub job finished on `date -Iseconds`" >> $TMP_OUTPUT

curl \
  --netrc --ssl-reqd \
  --mail-from "<$EMAIL_ADDRESS>" \
  --mail-rcpt "<$EMAIL_ADDRESS>" \
  --url smtps://smtp.gmail.com:465 \
  -T "$TMP_OUTPUT" \
  && rm "$TMP_OUTPUT" || true


echo "[`date -Iseconds`] Scrub job ended."
exit 0;

btrfs-scrub.service

[Unit]
Description=btrfs scrub

[Service]
User=root
Type=simple
ExecStart=/usr/local/bin/btrfs-scrub

btrfs-scrub.timer

[Unit]
Description=Runs btrfs scrub on all discs monthly

[Timer]
OnCalendar=weekly

[Install]
WantedBy=timers.target

Change to use:

• iso timestamps
• send mails using gmail via curl + netrc
• use root account for that matter.
• weekly checks

My improved version is here: https://github.com/ceremcem/monitor-btrfs-disk

Thanks for letting me know!