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Fix nvme-ebs-links (issue #44) (#45) 

* EBS may prepend '/dev/' in front of the EBS alias, adjust the sanity sed to account for this.
* Attempt to get a sane EBS alias up to 50x, sleep 1/10s in between (max duration ~5 secs).
* Log when we add/fail-to-add/remove EBS alias symlinks.
This commit is contained in:
tomalok 2019-03-03 21:57:28 -08:00 committed by GitHub
parent 00aec03281
commit 052cab8914
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1 changed files with 25 additions and 9 deletions
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34
nvme/nvme-ebs-links
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@ -2,26 +2,42 @@
[ -x /usr/sbin/nvme ] || exit
PROC="$(basename $0)[$$]"
log() {
FACILITY="kern.$1"
shift
logger -s -p "$FACILITY" -t "$PROC" "$@"
}
raw_ebs_alias() {
/usr/sbin/nvme id-ctrl "/dev/$BASE" -b 2>/dev/null | dd bs=32 skip=96 count=1 2>/dev/null
}
case $ACTION in
add|"")
BASE=$(echo $MDEV | sed -re 's/^(nvme[0-9]+n[0-9]+).*/\1/')
PART=$(echo $MDEV | sed -re 's/nvme[0-9]+n[0-9]+p?//g')
MAXTRY=50
TRY=0
until [ -n "$EBS" ]; do
EBS=$(
/usr/sbin/nvme id-ctrl "/dev/$BASE" -b 2>/dev/null |
dd bs=32 skip=96 count=1 2>/dev/null |
sed -nre '/^(s|xv)d[a-z]{1,2} +$/p' |
tr -d ' '
)
EBS=$(raw_ebs_alias | sed -nre '/^(\/dev\/)?(s|xv)d[a-z]{1,2} /p' | tr -d ' ')
[ -n "$EBS" ] && break
TRY=$((TRY + 1))
if [ $TRY -eq $MAXTRY ]; then
log err "Failed to get EBS volume alias for $MDEV after $MAXTRY attempts ($(raw_ebs_alias))"
exit 1
fi
sleep 0.1
done
EBS=${EBS#/dev/}$PART
ln -sf "$MDEV" "${EBS/xvd/sd}"
ln -sf "$MDEV" "${EBS/sd/xvd}"
ln -sf "$MDEV" "${EBS/xvd/sd}" && log notice "Added ${EBS/xvd/sd} symlink for $MDEV"
ln -sf "$MDEV" "${EBS/sd/xvd}" && log notice "Added ${EBS/sd/xvd} symlink for $MDEV"
;;
remove)
for TARGET in sd* xvd*
do
[ "$(readlink $TARGET 2>/dev/null)" = "$MDEV" ] && rm -f "$TARGET"
[ "$(readlink $TARGET 2>/dev/null)" = "$MDEV" ] && rm -f "$TARGET" && log notice "Removed $TARGET symlink for $MDEV"
done
;;
esac