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. ${BUILDFILE%/*}/common.sh
pkgver=20181224.2
package() {
preamble
depends+=(duplicity)
add-file -m755 etc/systemd/system/backup <<'EOF'
#!/usr/bin/env bash
{
set -euE
mkdir -p /var/lib/backup/{private,public}
export GNUPGHOME=/var/lib/backup/private/gnupg
gpgconf --kill all
trap 'gpgconf --kill all' EXIT
######################################################################
# Signing key
if ! [[ -d "$GNUPGHOME" ]]; then
install -d -m 700 "$GNUPGHOME"
printf '%s\n' \
'%no-protection' \
'Key-Type: default' \
'Subkey-Type: default' \
'Name-Real: Backup' \
"Name-Email: backup@$HOSTNAME" \
'Expire-Date: 0' \
| gpg --gen-key --batch
fi
key_sign="$(gpg --list-secret-keys --with-colons | awk -F: '/^sec:/{print $5}')"
key_sign_pass=''
# Encryption keys
keys_encrypt=(
'99195DD3BB6FE10A2F36ED8445698744D4FFBFC9' # Luke Shumaker
)
gpg --recv-keys "${keys_encrypt[@]}" || true
keys_encrypt+=("$key_sign")
key_encrypt_pass=''
######################################################################
backup_args=(
"${keys_encrypt[@]/#/--encrypt-key=}"
--sign-key="$key_sign"
--gpg-options='--always-trust' # Trust that keys_encrypt is verified before putting it in this script
--exclude-other-filesystems
#--progress # seems broken?
)
prune_args=(
remove-all-but-n-full 2 --force
)
declare -A backups
backups['srv']='--exclude=/srv/repo/main /srv' # trust mirrors to backup /srv/repo main for us
backups['etc']='/etc'
backups['home']='/home'
backups['home_root']='/root'
backups['pkg']='--no-compression /var/cache/pacman/pkg' # already heavily compressed
backups['log']='/var/log'
######################################################################
export PASSPHRASE="${key_encrypt_pass}"
export SIGN_PASSPHRASE="${key_sign_pass}"
declare -i r=0
for backup in "${!backups[@]}"; do
duplicity=(
duplicity
--archive-dir='/var/lib/backup/private/duplicity'
--name="$backup"
)
printf '======================> %s <======================\n' "$backup"
primary_chain_size=$("$(dirname -- "${BASH_SOURCE[0]}")/duplicity-primary-chain-size" "$backup") || { r=$?; continue; }
IFS=+ read -r full inc <<<"$primary_chain_size"
if (( inc >= full )); then
action=full
else
action=inc
fi
"${duplicity[@]}" "$action" "${backup_args[@]}" ${backups[$backup]} "file:///var/lib/backup/public/$backup" || r=$?
chmod 644 "/var/lib/backup/public/$backup"/*.gpg || r=$?
"${duplicity[@]}" "${prune_args[@]}" "file:///var/lib/backup/public/$backup" || r=$?
done
exit $r
}
EOF
add-file -m755 etc/systemd/system/duplicity-primary-chain-size <<'EOF'
#!/usr/bin/env bash
shopt -s extglob nullglob
glob_date='[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]T[0-9][0-9][0-9][0-9][0-9][0-9]Z'
glob_n='+([0-9])'
die() {
printf '%s: ' "$0" >&2
printf "$@" >&2
exit 1
}
{
name=$1
dir="/var/lib/backup/public/$name"
declare -A snap_parent
declare -A snap_files
for file in "$dir"/*; do
if [[ ! -f $file ]] || [[ -L $file ]]; then
die "unexpected non-file: %q" "$file"
fi
case "${file##*/}" in
duplicity-full-signatures.${glob_date}.sigtar.gpg) type=full;;
duplicity-full.${glob_date}.manifest.gpg) type=full;;
duplicity-full.${glob_date}.vol${glob_n}.difftar.gpg) type=full;;
duplicity-inc.${glob_date}.to.${glob_date}.manifest.gpg) type=inc;;
duplicity-inc.${glob_date}.to.${glob_date}.vol${glob_n}.difftar.gpg) type=inc;;
duplicity-new-signatures.${glob_date}.to.${glob_date}.sigtar.gpg) type=inc;;
*) die "unexpected file name: %q" "$file";;
esac
declare date= parent=
case "$type" in
full)
IFS=. read -r _ date _ <<<"${file##*/}"
parent=full
;;
inc)
IFS=. read -r _ parent _ date _<<<"${file##*/}"
;;
esac
if [[ -n ${snap_parent[$date]} && ${snap_parent[$date]} != "$parent" ]]; then
die "multiple parents for %q: %s %q" "$date" "${snap_parent[$date]}" "$parent"
fi
snap_parent[$date]="$parent"
snap_files[$date]+="${file@Q} "
done
if (( ${#snap_parent[@]} == 0 )); then
echo "0+0"
exit 0
fi
last=$(printf '%s\0' "${!snap_parent[@]}" | LC_COLLATE=C sort -z | tail -z -n1 | xargs -0)
declare -i inc_size=0
declare -i full_size=0
while [[ $last != full ]]; do
declare -i size=0
eval "files=(${snap_files[$last]})"
for file in "${files[@]}"; do
size+=$(stat -c '%s' -- "$file")
done
if [[ ${snap_parent[$last]} != full ]]; then
inc_size+=$size
else
full_size=$size
fi
last=${snap_parent[$last]}
done
printf '%s+%s\n' "$full_size" "$inc_size"
}
EOF
mkdir -p var/lib/backup
add-file -m644 etc/systemd/system/backup.service <<EOF
[Unit]
Description=Create backups
[Service]
Type=oneshot
ExecStart=/etc/systemd/system/backup
ProtectSystem=strict
ReadWritePaths=/var/lib/backup
PrivateTmp=true
Nice=19
IOSchedulingClass=idle
EOF
add-file -m644 etc/systemd/system/backup.timer <<EOF
[Unit]
Description=Daily backup creation
[Timer]
OnCalendar=daily
Persistent=true
[Install]
WantedBy=timers.target
EOF
add-unit etc/systemd/system/timers.target.wants/backup.timer
# Expose encrypted backups
mkdir -p srv/http/myhostname
ln -s /var/lib/backup/public srv/http/myhostname/backup
depends+=(config-parabola-service-myhostname)
postamble
}
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