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|
#!/usr/bin/env bash
set -e
! read -rd '' AWK_PREFILTER <<'EOF'
/(\/|^)[0-9]{4}-[0-9]{2}-[0-9]{2}-[0-9]{6}$/ {
a[$0]
}
END {
n = asorti(a)
for (i = n; i >= 1; --i)
print a[i]
}
EOF
! read -rd '' AWK_FILTER <<'EOF'
function flr(n, s) {
return int(n / s) * s
}
function mstart(t) {
return mktime(strftime("%Y %m 01 00 00 00", t, 1), 1)
}
BEGIN {
n = split("h d w M", arr)
for (i = 1; i <= n; ++i) {
b = arr[i]
if (!match(opt_retain, "([*0-9]+)(\\^?)" b, md))
continue
ret[b] = md[1]
newest_in[b] = (md[2] == "^")
buckets[++n_buckets] = b
}
split("sun mon tue wed thu fri sat", arr)
for (i in arr)
arr2[arr[i]] = i - 1
wshift = (11 - arr2[opt_week_start])*24*60*60
}
NR == 1 {
++keep[$0]
}
{
t = mktime(gensub(/(.*\/|^)(.+)-(..)-(..)-(..)(..)(..)$/,
"\\2 \\3 \\4 \\5 \\6 \\7", 1), 1)
if (t < 0) {
++keep[$0]
next
}
bt["h"] = flr(t, 60*60)
bt["d"] = flr(t, 24*60*60)
bt["w"] = flr(t + wshift, 7*24*60*60) - wshift
bt["M"] = mstart(t)
for (i = 1; i <= n_buckets; ++i) {
b = buckets[i]
if (b == "M" && "w" in ret) {
if (newest_in["w"]) {
if (mstart(bt["w"] + 6*24*60*60) > bt["M"])
next
} else if (bt["w"] < bt["M"]) {
next
}
}
if (newest_in[b] && bt[b] == last[b, b] && (i == 1 ||
bt[buckets[i-1]] != last[b, buckets[i-1]]))
next
if ((b, bt[b]) in bkeep || ret[b] == "*" || bc[b]++ < ret[b])
bkeep[b, bt[b]] = $0
for (j in buckets)
last[b, buckets[j]] = bt[buckets[j]]
}
}
END {
for (i in bkeep)
++keep[bkeep[i]]
n = asorti(keep)
for (i = 1; i <= n; ++i)
print keep[i]
}
EOF
run() {
echo "* ${@}"
"${@}"
}
current() {
local str="${1}" interval="${2}"
local s=0 val d
while [[ "${interval}" =~ ([0-9]+)(.?) ]]; do
val="${BASH_REMATCH[1]}"
case "${BASH_REMATCH[2]}" in
d) ((s += val * 24*60*60)) ;;
h) ((s += val * 60*60)) ;;
m) ((s += val * 60)) ;;
*) ((s += val)) ;;
esac
interval="${interval#*${BASH_REMATCH[0]}}"
done
((s < 1)) && return 1
d="${str:0:10} ${str:11:2}:${str:13:2}:${str:15:2}"
(($(date -u +%s) / s == $(date -ud "${d}" +%s) / s))
}
backup() {
local dest_dir="${1}" src_path="${2}"
local retain="${3}" interval="${4}" week_start="${5}"
local dest_path snaps keep i ki
mapfile -td $'\0' snaps < <(shopt -s nullglob;
printf '%s\0' "${dest_dir}/"* | awk -v 'RS=\0' -v 'ORS=\0' \
-- "${AWK_PREFILTER}")
[[ -n "${snaps}" ]] && current "${snaps[0]##*/}" "${interval}" && \
return
((dcount++ > 0)) && echo
echo "[${dcount}] [${retain}] ${src_path} => ${dest_dir}"
dest_path="${dest_dir}/$(date -u '+%Y-%m-%d-%H%M%S')"
run rsync -ac --mkpath ${snaps[0]:+"--link-dest=${snaps[0]}"} \
"${src_path}" "${dest_path}"
snaps+=("${dest_path}")
mapfile -td $'\0' snaps < <(
printf '%s\0' "${snaps[@]}" | awk -v 'RS=\0' -v 'ORS=\0' \
-- "${AWK_PREFILTER}")
mapfile -td $'\0' keep < <(
printf '%s\0' "${snaps[@]}" | awk -v 'RS=\0' -v 'ORS=\0' \
-v "opt_retain=${retain}" \
-v "opt_week_start=${week_start}" \
-- "${AWK_FILTER}")
if [[ -z "${keep}" ]]; then
echo "WARNING: dirs to keep shouldn't be empty; skipping" >&2
return
fi
for ((i = ${#snaps[@]} - 1, ki = 0; i >= 0; --i)); do
if [[ "${snaps[i]}" == "${keep[ki]}" ]]; then
((++ki))
else
run rm -r "${snaps[i]}"
fi
done
printf 'kept %s\n' "${keep[@]}"
}
declare -A def_opts=(
['retain']='*h' # e.g. 24h7d4w12M or 24^h10d*M
['interval']='0'
['week_start']='mon'
)
declare -A opts
while IFS='=' read -r f1 f2; do
[[ -z "${f1}" ]] || [[ "${f1}" == '#'* ]] && continue
if [[ "${f1}" =~ ^\[(.*)]$ ]]; then
base_path="${BASH_REMATCH[1]}"
declare -A opts="$(declare -p def_opts | sed '1s/[^=]*=//')"
elif [[ "${f1}" == '$'* ]]; then
opt="${f1:1}"
[[ "${f2}" == '-' ]] && opts["${opt}"]= ||
opts["${opt}"]="${f2:-"${def_opts["${opt}"]}"}"
else
backup "${base_path}/${f1}" "${f2}" \
"${opts['retain']}" \
"${opts['interval']}" \
"${opts['week_start']}"
fi
done < "${1}"
|
