#!/bin/sh

# Account on spmt-backup
SPMT_USER=hpcjgrac

# Which directories should be backed up
# INCLUDE_BACKUP_DIRS=($HOME/delme $HOME/bin)    # note: these are bsh arrays, keep the braces and escape spaces if necessary  
INCLUDE_BACKUP_DIRS=($HOME)
# and which should not 
# EXCLUDE_BACKUP_DIRS=($HOME/delme)
EXCLUDE_BACKUP_DIRS=($HOME/Library/Thunderbird/Profiles/ $HOME/delme $HOME/Downloads/ $HOME/Sync $HOME/work/ChEESE_audits $HOME/work/spack)

# Retention policies, how many daily, weekly, monthly backups to keep.
KEEP_DAILY=7
KEEP_WEEKLY=4
KEEP_MONTHLY=12
KEEP_YEARLY=-1       # never delete yearly backups

# Create file with borg repo passphrase: `echo "MY SUPER PASSPHRASE" | base64 > $HOME/.borg_passphrase`
export BORG_PASSCOMMAND="base64 -d $HOME/.borg_passphrase"
# or use BORG_PASSPHRASE below.

# See the section "Passphrase notes" for more infos.
# export BORG_PASSPHRASE='XYZl0ngandsecurepa_55_phrasea&&123'


#################################################################
#### Nothing else to be done below! Change at your onw risk. ####

export BORG_REPO=ssh://spmt-backup/storage/backup/repos/${SPMT_USER}

# some helpers and error handling:
info() { printf "\n%s %s\n\n" "$( date )" "$*" >&2; }
trap 'echo $( date ) Backup interrupted >&2; exit 2' INT TERM

info "Starting backup"

EXCLUDE_FROM=$(mktemp tmp.borg_dayly.XXXXX)
#EXCLUDE_FROM=tmp.borg_dayly
trap 'echo "Removing temporary files"; rm ${EXCLUDE_FROM}' EXIT
for d in "${EXCLUDE_BACKUP_DIRS[@]}"; do
  echo ${d} >> ${EXCLUDE_FROM}
done


# Backup the most important directories into an archive named after
# the machine this script is currently running on

borg create                         \
    --verbose                       \
    --filter AME                    \
    --list                          \
    --stats                         \
    --show-rc                       \
    --compression lz4               \
    --exclude-caches                \
    --exclude-from ${EXCLUDE_FROM}  \
    ::'{hostname}-{now}'            \
    ${INCLUDE_BACKUP_DIRS}


# Prune old backups and compact repo

borg prune                         \
    --stats --verbose --list       \
    --keep-daily=${KEEP_DAILY}     \
    --keep-weekly=${KEEP_WEEKLY}   \
    --keep-monthly=${KEEP_MONTHLY} \
    --keep-yearly=${KEEP_YEARLY}   

borg compact                       \
    --verbose