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
19 badusage () { echo >&2 "snaprsync: bad usage: $1"; exit 12; }
20 x () { echo "+ $@"; "$@"; }
21 xspawned () { eval "${1}pid=$!; echo \"+[$!] ($1) &\";"; }
22 xwait () { eval "echo \"+[\$${1}pid] ($1)...\"; wait \$${1}pid;"; }
27 name=${1#--}; name=${name%%=*}
30 rhost|device|mountpoint|localarea);;
31 localprevious|snapkind|rsharedir|retcdir|rvardir|bwlimit);;
33 *) badusage "unknown setting $name";;
38 -*) badusage "unknown option $1" ;;
44 for name in rhost device mountpoint localarea; do
46 if [ "x$value" != x ]; then continue; fi
47 if [ $# = 0 ]; then badusage "no value for setting $name"; fi
52 datefmt='%Y-%m-%d %H:%M:%S Z'
53 rsync="rsync ${bwlimit:+--bwlimit} $bwlimit"
54 export RSYNC_RSH='ssh -o compression=no'
55 sshpfx='PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin; export PATH; '
57 ssh $rhost "$sshpfx date -u '+$rhost $datefmt start'"
58 ssh $rhost "$sshpfx id"
59 ssh $rhost "$sshpfx ls -d $rsharedir"
60 ssh $rhost "$sshpfx ls -d $rvardir"
62 test -d $localarea || x mkdir $localarea
64 rsumsfile=for-$ournode.sums
65 summer='summer -ACDbtqf'
69 trap 'rm -rf $td; exit $rc' 0
72 mkfifo -m 600 $td/sentinel
75 x ssh $rhost "$sshpfx $rsharedir/snap-drop"
80 echo '$retcdir/snap/$snapkind drop $rvardir' >snap-drop.new
81 mv snap-drop.new snap-drop
83 x ssh $rhost "$sshpfx $retcdir/snap/$snapkind snap $rvardir $device $mountpoint"
84 ssh $rhost <$td/sentinel 4<&- "
87 date -u '+$rhost $datefmt main'
89 (set +e; read x <&3; kill 0) &
95 date -u '+$rhost $datefmt sumsdone'
99 x $rsync -aHSxz --numeric-ids --delete \
100 ${localprevious:+--link-dest} $localprevious \
101 $rhost:$rvardir/snap-mount/$subdir $localarea/.
102 date -u "+ $datefmt rsyncdone"
104 exec 3>$localarea,lsums
112 date -u "+ $datefmt sumsdone"
113 x ssh $rhost "$sshpfx $rsharedir/snap-drop"
115 if [ "x${localprevious}" != x ]; then
116 cp "$localprevious,rsums" "$localarea,rsums"
119 $rhost:$rvardir/$rsumsfile \
123 date -u "+ $datefmt checking"
126 diff -u "$localarea,rsums" "$localarea,lsums" >"$localarea,sumsdiff"
129 test $diffrc = 0 || test $diffrc = 1
131 date -u "+ $datefmt checked $diffrc"