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
|
#!/bin/bash
#
# usage: snaprsync <setting>... <positionals>
# <setting> is --<name>=<value>
# <positionals> are assigned to unused mandatory values in order
# mandatory:
# rhost device mountpoint localarea
# optional:
localprevious=
snapkind=lvm
rsharedir=/usr/share/chiark-backup
retcdir=/etc/chiark-backup
rvardir=/var/lib/chiark-backup
bwlimit=
subdir=.
rsyncopts=
summer=summer
set -e
badusage () { echo >&2 "snaprsync: bad usage: $1"; exit 12; }
nb_echo () { (echo "$@"); } # See Debian #382798
x () { nb_echo "+ $@"; "$@"; }
xspawned () { eval "${1}pid=$!; nb_echo \"+[$!] ($1) &\";"; }
xwait () { eval "nb_echo \"+[\$${1}pid] ($1)...\"; wait \$${1}pid;"; }
while true; do
case "$1" in
--?*=*)
name=${1#--}; name=${name%%=*}
value=${1#--*=}
case "$name" in
rhost|device|mountpoint|localarea);;
localprevious|snapkind|rsharedir|retcdir|rvardir|bwlimit);;
subdir|rsyncopts|summer);;
*) badusage "unknown setting $name";;
esac
eval "$name=\$value"
;;
--) shift; break ;;
-*) badusage "unknown option $1" ;;
*) break ;;
esac
shift
done
for name in rhost device mountpoint localarea; do
eval "value=\$$name"
if [ "x$value" != x ]; then continue; fi
if [ $# = 0 ]; then badusage "no value for setting $name"; fi
eval "$name=$1"
shift
done
datefmt='%Y-%m-%d %H:%M:%S Z'
rsync="rsync ${bwlimit:+--bwlimit} $bwlimit"
export RSYNC_RSH='ssh -o compression=no'
sshpfx='PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin; export PATH; '
ssh $rhost "$sshpfx date -u '+$rhost $datefmt start'"
ssh $rhost "$sshpfx id"
ssh $rhost "$sshpfx ls -d $rsharedir"
ssh $rhost "$sshpfx ls -d $rvardir"
test -d $localarea || x mkdir $localarea
ournode=`uname -n`
rsumsfile=for-$ournode.sums
summer="$summer -ACDbtqf"
td=/dev/enoent
rc=12
trap 'rm -rf $td; exit $rc' 0
td=`mktemp -td`
mkfifo -m 600 $td/sentinel
exec 4<>$td/sentinel
x ssh $rhost "$sshpfx $rsharedir/snap-drop"
ssh $rhost "
$sshpfx
set -e
cd $rvardir
echo '$retcdir/snap/$snapkind drop $rvardir' >snap-drop.new
mv snap-drop.new snap-drop
"
x ssh $rhost "$sshpfx $retcdir/snap/$snapkind snap $rvardir $device $mountpoint"
ssh $rhost <$td/sentinel 4<&- "
$sshpfx
set -e
date -u '+$rhost $datefmt main'
exec 3<&0 0</dev/null
(set +e; read x <&3; kill 0) &
cd $rvardir
umask 077
exec 3>$rsumsfile
cd snap-mount
$summer . >&3
date -u '+$rhost $datefmt sumsdone'
cd ..
" &
xspawned rsum
x $rsync -aHSxz --numeric-ids --delete $rsyncopts \
${localprevious:+--link-dest} $localprevious \
$rhost:$rvardir/snap-mount/$subdir $localarea/.
date -u "+ $datefmt rsyncdone"
exec 3>$localarea,lsums
(cd $localarea && \
$summer . >&3) &
xspawned lsum
exec 3>&-
xwait rsum
exec 4<&-
date -u "+ $datefmt sumsdone"
x ssh $rhost "$sshpfx $rsharedir/snap-drop"
if [ "x${localprevious}" != x ] && test -f "$localprevious,rsums"; then
cp "$localprevious,rsums" "$localarea,rsums"
fi
x $rsync -p \
$rhost:$rvardir/$rsumsfile \
"$localarea,rsums"
xwait $lsum
date -u "+ $datefmt checking"
set +e
diff -u "$localarea,rsums" "$localarea,lsums" >"$localarea,sumsdiff"
diffrc=$?
set -e
test $diffrc = 0 || test $diffrc = 1
date -u "+ $datefmt checked $diffrc"
rc=$diffrc
|
