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|
#! /bin/sh
#
# make-snapshot {source-directory} {snapshot-directory}
#
set -euf
source="$1"
snapshot="$2"
echo "source directory is $source"
echo "snapshot directory is $snapshot"
# TODO check whether $snapshot is a snapshot directory
ls "$snapshot/by-date" >/dev/null
# Set $link_dest to the latest snapshot, if there is one.
# pre:
# $snapshot/by-date is a directory that contains only directories
# where names are produced by $(date +%Y-%d-%mT%H:%M:%S) or
# start with a . (and thus are not listed by ls).
# post:
# $link_dest is set iff there is a latest snapshot
# $link_dest is set to the filename of the latest snapshot
# 2012-11-08 tv TODO check pre-condition
latest="$(ls -r "$snapshot/by-date" | grep ^[0-9] | head -n 1)"
if test -n "$latest"; then
link_dest="$snapshot/by-date/$latest"
echo latest snapshot is $link_dest
fi
timestamp="$(date +%Y-%m-%dT%H:%M:%S)"
complete="$snapshot/by-date/$timestamp"
partial="$snapshot/by-date/.$timestamp.part"
# TODO incooperate into ach's version
if present_partials="$(ls -ar "$snapshot/by-date" | grep '^\..*\.part$')"; then
case $(echo "$present_partials" | wc -l) in
(0) : ;; # nothing to do
(1)
echo "found partial snapshot: $present_partials"
printf "do you want to continue [y/N] "
read answer
case "$answer" in
(y|Y) partial="$snapshot/by-date/$present_partials";;
(*)
echo "abort"; exit 23
;;
esac
;;
(*)
echo "found too many partial snapshots:"
echo "$present_partials"
echo "abort"; exit 23
;;
esac
fi
# sync $source to $partial
if test -d "${link_dest-}"; then
cp -al "$link_dest" "$partial"
fi
rsync -v \
-aAXF \
--delete \
"$source/" "$partial"
sync
mv "$partial" "$complete"
sync
# mark this snapshot as current
rm -f "$snapshot/current"
ln -snf "by-date/$timestamp" "$snapshot/current"
echo "current snapshot is $(find "$snapshot/current" -exec readlink -f \{\} \;)"
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