1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
|
#!/usr/bin/env bash
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]] = $0
for (j in buckets)
last[b, buckets[j]] = bt[buckets[j]]
}
}
END {
for (i in bkeep)
++keep[bkeep[i]]
n = asorti(keep)
for (i = 1; i <= n; ++i)
print keep[i]
}
EOF
err() {
echo "${0##*/}: error: $*" >&2
}
run() {
echo "* $*"
if ! "$@"; then
err "command failed: $*"
return 1
fi
}
current() {
local str="${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))
}
filter() {
local -n _f_src="${1}" _f_dest="${2}"
local _f_dest_name="${2}" _f_label="${3}" _f_script="${4}"
shift 4
mapfile -td $'\0' "${_f_dest_name}" < <(
printf '%s\0' "${_f_src[@]}" | awk -v 'RS=\0' -v 'ORS=\0' \
"${@}" -- "${_f_script}")
wait "$!"
if [[ "$?" -ne 0 ]]; then
err "${_f_label} failed"
return 1
fi
if [[ ${#_f_src[@]} -gt 0 && ! -d "${_f_dest[0]}" ]]; then
err "${_f_label} returned empty or invalid list"
return 1
fi
}
backup() {
local src_path="${1}" dest_dir="${2}"
local retain="${3}" interval="${4}" week_start="${5}"
local dest_path snaps keep skip i ki
if [[ ! -e "${src_path}" ]]; then
err "source does not exist: ${src_path}"
return 1
fi
mapfile -td $'\0' snaps < \
<(shopt -s nullglob; printf '%s\0' "${dest_dir}/"*)
filter snaps snaps 'pre-snapshot awk prefilter' "${AWK_PREFILTER}" \
|| return 1
[[ -n "${snaps}" ]] && current "${snaps[0]##*/}" "${interval}" \
&& return
dest_path="${dest_dir}/$(date -u '+%Y-%m-%d-%H%M%S')"
if [[ -e "${dest_path}" || -e "${dest_path}.tmp" ]]; then
err "destination already exists: ${dest_path}"
return 1
fi
run rsync -ac --mkpath ${snaps[0]:+"--link-dest=${snaps[0]}"} \
"${src_path}" "${dest_path}.tmp/" || return 1
run mv -T "${dest_path}.tmp" "${dest_path}" || return 1
if [[ ! "${retain}" =~ ^( *([0-9]+|\*)\^?[hdwM] *)+$ ]]; then
err "invalid \$retain setting: ${retain}"
return 1
fi
snaps+=("${dest_path}")
filter snaps snaps 'post-snapshot awk prefilter' "${AWK_PREFILTER}" \
|| return 1
filter snaps keep 'awk filter' "${AWK_FILTER}" \
-v "opt_retain=${retain}" -v "opt_week_start=${week_start}" \
|| return 1
for ((i = ${#snaps[@]} - 1, ki = 0; i >= 0; --i)); do
if [[ "${snaps[i]}" == "${keep[ki]}" ]]; then
((++ki))
else
run rm -rf "${snaps[i]}"
fi
done
}
declare -A def_opts=(
['retain']='*h' # e.g. 24h7d4w12M or 24^h10d*M
['interval']='0'
['week_start']='mon'
)
declare -A opts
declare -A seen
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["${opt}"]}"}"
else
dest="${base_path}/${f1}"
printf '[%d] [%s] %s => %s%s\n' "$((++dcount))" \
"${opts['retain']}" "${f2}" "${dest}"
dest_rp="$(realpath -m "${dest}")"
if [[ -v "seen["${dest_rp}"]" ]]; then
err "destination already seen: ${dest}"
((++errors))
continue
fi
seen["${dest_rp}"]=
backup "${f2}" "${dest}" \
"${opts['retain']}" \
"${opts['interval']}" \
"${opts['week_start']}" \
|| ((++errors))
fi
done < "${1}"
((!errors))
|
