Merging scripts from https://reguchi.wordpress.com/2020/02/11/oci-file-storage-snapshot-management/ into one. Using with Rundeck to create snapshots.

oci_fss_snapshots.sh

#!/usr/bin/env bash
# shellcheck disable=2059,2154,2034,2155,2046,2086
#===============================================================================
# vim: softtabstop=2 shiftwidth=2 expandtab fenc=utf-8 spelllang=en ft=sh
#===============================================================================
#
#          FILE: oci_fss_snapshots.sh
#
#         USAGE: ./oci_fss_snapshots.sh
#
#   DESCRIPTION: Create OCI FSS snapshot and cleanup older snapshots.
#
#===============================================================================

set -e          # Exit immediately on error
set -u          # Treat unset variables as an error
set -o pipefail # Prevent errors in a pipeline from being masked
IFS=$'\n\t'     # Set the internal field separator to a tab and newline

###############
#  Variables  #
###############

export DEBUG=true
declare -A timings
export FSSOCID=<OCID> # Comment
export TSTAMP=`date +%Y%m%d`
export ENV=ps
export KEEP=42

###############
#  Functions  #
###############

function echoinfo() {
  local GC="\033[1;32m"
  local EC="\033[0m"
  printf "${GC} ☆  INFO${EC}: %s${GC}\n" "$@";
}

function echodebug() {
  local BC="\033[1;34m"
  local EC="\033[0m"
  local GC="\033[1;32m"
  if [[ -n ${DEBUG+x} ]]; then
    printf "${BC} ★  DEBUG${EC}: %s${GC}\n" "$@";
  fi
}

function echoerror() {
  local RC="\033[1;31m"
  local EC="\033[0m"
  printf "${RC} ✖  ERROR${EC}: %s\n" "$@" 1>&2;
}

function display_timings_summary() {
  local divider='=============================='
  divider=$divider$divider
  local header="\n %-28s %s\n"
  local format=" %-28s %s\n"
  local width=40
  local total_duration=0

  for duration in "${timings[@]}"; do
    total_duration=$((duration + total_duration))
  done

  printf "$header" "TASK" "DURATION"
  printf "%$width.${width}s\n" "$divider"
  for key in "${!timings[@]}"; do
    local converted_timing=$(date -u -d @${timings[$key]} +"%T")
    printf "$format" "$key" "${converted_timing}"
  done
  printf "%$width.${width}s\n" "$divider"
  printf "$format" "TOTAL TIME:" $(date -u -d @${total_duration} +"%T")
  printf "\n"
}

function create_snapshot(){
  local begin=$(date +%s)
  echoinfo "Creating Snapshot"

  echodebug ""
  if [[ -n ${DEBUG+x} ]]; then
    oci fs snapshot create --file-system-id=$FSSOCID --name=$ENV.$TSTAMP
  else 
    oci fs snapshot create --file-system-id=$FSSOCID --name=$ENV.$TSTAMP > /dev/null 2>&1
  fi
  
  local end=$(date +%s)
  local tottime="$((end - begin))"
  timings[create_snapshot]=$tottime
}

function cleanup_snapshots(){
  local begin=$(date +%s)
  echoinfo "Cleaning up Snapshots"

    oci fs snapshot list --file-system-id=$FSSOCID | grep '"id"' | awk '{print $2}' | sed 's/"//g' | sed 's/,//g' > /tmp/fss.bkp
    CT=`cat /tmp/fss.bkp | wc -l`
    if [ "$CT" -gt $KEEP ]; then
        DIFF=$(expr $CT - $KEEP)
        for id in `tail -$DIFF /tmp/fss.bkp`
        do
           oci fs snapshot delete --force --snapshot-id $id
        done
    else
        echoinfo "Current snapshot count ${CT} is then ${KEEP}"
    fi
  
  local end=$(date +%s)
  local tottime="$((end - begin))"
  timings[cleanup_snapshots]=$tottime
}


########
# Main #
########

create_snapshot
cleanup_snapshots

display_timings_summary