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
18 badusage () { echo >&2 "snaprsync: bad usage: $1"; exit 12; }
19 x () { echo "+ $@"; "$@"; }
20 xspawned () { eval "${1}pid=$!; echo \"+[$!] ($1) &\";"; }
21 xwait () { eval "echo \"+[\$${1}pid] ($1)...\"; wait \$${1}pid;"; }
26 name=${1#--}; name=${name%%=*}
29 rhost|device|mountpoint|localarea);;
30 localprevious|rsharedir|retcdir|rvardir|bwlimit);;
31 *) badusage "unknown setting $name";;
36 -*) badusage "unknown option $1" ;;
42 for name in rhost device mountpoint localarea; do
44 if [ "x$value" != x ]; then continue; fi
45 if [ $# = 0 ]; then badusage "no value for setting $name"; fi
50 datefmt='%Y-%m-%d %H:%M:%S Z'
51 rsync="rsync ${bwlimit:+--bwlimit} $bwlimit"
52 export RSYNC_RSH='ssh -o compression=no'
54 ssh $rhost "date -u '+$rhost $datefmt start'"
56 ssh $rhost ls -d $rsharedir
57 ssh $rhost ls -d $rvardir
59 test -d $localarea || x mkdir $localarea
61 rsumsfile=for-$ournode.sums
62 summer='summer -ACDbtqf'
66 trap 'rm -rf $td; exit $rc' 0
69 mkfifo -m 600 $td/sentinel
72 x ssh $rhost "$rsharedir/snap-drop"
73 x ssh $rhost "$retcdir/snap/$snapkind snap $rvardir $device $mountpoint"
74 ssh $rhost <$td/sentinel 4<&- "
76 date -u '+$rhost $datefmt main'
78 (set +e; read x <&3; kill 0) &
83 $summer . | sort -t' ' -k2 >&3
84 test x\"\${PIPESTATUS[*]}\" = 'x0 0'
85 date -u '+$rhost $datefmt sumsdone'
89 x $rsync -aHSxz --numeric-ids --delete \
90 ${localprevious:+--link-dest} $localprevious \
91 $rhost:$rvardir/snap-mount/. $localarea/.
92 date -u "+ $datefmt rsyncdone"
94 exec 3>$localarea,lsums
96 $summer . | sort -t' ' -k2 >&3 && \
97 test x"${PIPESTATUS[*]}" = 'x0 0') &
103 date -u "+ $datefmt sumsdone"
104 x ssh $rhost "$rsharedir/snap-drop"
106 if [ "x${localprevious}" != x ]; then
107 cp "$localprevious,rsums" "$localarea,rsums"
110 $rhost:$rvardir/$rsumsfile \
114 date -u "+ $datefmt checking"
117 x diff -u "$localarea,rsums" "$localarea,lsums" >"$localarea,sumsdiff"
120 test $diffrc = 0 || test $diffrc = 1
122 date -u "+ $datefmt checked $diffrc"