3 # usage: snaprsync <setting>... <positionals>
4 # <setting> is --<name>=<value>
5 # <positionals> are assigned to unused mandatory values in order
7 # rhost device mountpoint localarea
11 rsharedir=/usr/share/chiark-backup
12 retcdir=/etc/chiark-backup
13 rvardir=/var/lib/chiark-backup
21 badusage () { echo >&2 "snaprsync: bad usage: $1"; exit 12; }
22 x () { echo "+ $@"; "$@"; }
23 xspawned () { eval "${1}pid=$!; echo \"+[$!] ($1) &\";"; }
24 xwait () { eval "echo \"+[\$${1}pid] ($1)...\"; wait \$${1}pid;"; }
29 name=${1#--}; name=${name%%=*}
32 rhost|device|mountpoint|localarea);;
33 localprevious|snapkind|rsharedir|retcdir|rvardir|bwlimit);;
34 subdir|rsyncopts|summer);;
35 *) badusage "unknown setting $name";;
40 -*) badusage "unknown option $1" ;;
46 for name in rhost device mountpoint localarea; do
48 if [ "x$value" != x ]; then continue; fi
49 if [ $# = 0 ]; then badusage "no value for setting $name"; fi
54 datefmt='%Y-%m-%d %H:%M:%S Z'
55 rsync="rsync ${bwlimit:+--bwlimit} $bwlimit"
56 export RSYNC_RSH='ssh -o compression=no'
57 sshpfx='PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin; export PATH; '
59 ssh $rhost "$sshpfx date -u '+$rhost $datefmt start'"
60 ssh $rhost "$sshpfx id"
61 ssh $rhost "$sshpfx ls -d $rsharedir"
62 ssh $rhost "$sshpfx ls -d $rvardir"
64 test -d $localarea || x mkdir $localarea
66 rsumsfile=for-$ournode.sums
67 summer="$summer -ACDbtqf"
71 trap 'rm -rf $td; exit $rc' 0
74 mkfifo -m 600 $td/sentinel
77 x ssh $rhost "$sshpfx $rsharedir/snap-drop"
82 echo '$retcdir/snap/$snapkind drop $rvardir' >snap-drop.new
83 mv snap-drop.new snap-drop
85 x ssh $rhost "$sshpfx $retcdir/snap/$snapkind snap $rvardir $device $mountpoint"
86 ssh $rhost <$td/sentinel 4<&- "
89 date -u '+$rhost $datefmt main'
91 (set +e; read x <&3; kill 0) &
97 date -u '+$rhost $datefmt sumsdone'
101 x $rsync -aHSxz --numeric-ids --delete $rsyncopts \
102 ${localprevious:+--link-dest} $localprevious \
103 $rhost:$rvardir/snap-mount/$subdir $localarea/.
104 date -u "+ $datefmt rsyncdone"
106 exec 3>$localarea,lsums
114 date -u "+ $datefmt sumsdone"
115 x ssh $rhost "$sshpfx $rsharedir/snap-drop"
117 if [ "x${localprevious}" != x ] && test -f "$localprevious,rsums"; then
118 cp "$localprevious,rsums" "$localarea,rsums"
121 $rhost:$rvardir/$rsumsfile \
125 date -u "+ $datefmt checking"
128 diff -u "$localarea,rsums" "$localarea,lsums" >"$localarea,sumsdiff"
131 test $diffrc = 0 || test $diffrc = 1
133 date -u "+ $datefmt checked $diffrc"