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#!/usr/bin/env bash

# Copyright (c) 2014-2015, Michał Górny
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice,
#    this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.

shopt -s nullglob
set -e -x

# == config ==
# filled with gentoo-specific details, change at will

source /usr/local/bin/mastermirror/rsync-gen.vars

# Final snapshots and deltas get mirrored out here.
mirrordir=${UPLOAD}/squashfs
# We keep reverse deltas around here to allow handling past snapshots
# without having to keep them in full size.
revdeltadir=${BASE}/squashfs-tmp
# This is where the master (unpacked) copy of the repository is located.
repodir=${FINALDIR}

# GPG key ID to sign with
signkeyid="DCD05B71EAB94199527F44ACDB6B8C1F96D8BF6D"

# Deltas to keep before cleanup
cleanupno=180

# == config ends here ==

if [[ ! -d ${revdeltadir} ]]; then
	mkdir -p "${revdeltadir}"
fi

# Squashdelta only supports lzo and lz4
algo_lzo=( -comp lzo -Xcompression-level 4 )
algo_xz=( -comp xz )
algo_LIST=( lzo xz )
mksquashfs_options=(
	-no-xattrs -force-uid portage -force-gid portage
)

[[ -d ${mirrordir} ]]
[[ -d ${revdeltadir} ]]
[[ -d ${repodir} ]]

reponame=$(<"${repodir}"/profiles/repo_name)

[[ ${reponame} ]]

tempdir=$(mktemp -d)

trap 'rm -r "${tempdir}"' EXIT

for algo in "${algo_LIST[@]}" ; do
	ext=".${algo}.sqfs"

	snapshots=( "${mirrordir}"/${reponame}-*${ext} )

	if [[ ${snapshots[@]} ]]; then
		yesterdaysnap=${snapshots[-1]}
	  if [[ ${yesterdaysnap} == *-current${ext} ]]; then
	    yesterdaysnap=$(readlink -m "${yesterdaysnap}")
	  fi
		yesterday=${yesterdaysnap#*/${reponame}-}
		yesterday=${yesterday%${ext}}
	fi

	# get date from the repo, move it few hours back to ensure
	# it is 'previous day', alike .tar snapshots
	today=$(date --date="$(<"${repodir}"/metadata/timestamp.chk ) - 6 hours" +%Y%m%d)
	todaysnap_file=${reponame}-${today}${ext}
	todaysnap=${mirrordir}/${todaysnap_file}

	if [[ ! -f ${todaysnap} ]]; then
		# take today's snapshot
		tmp=algo_$algo[@]
		file="${tempdir}/${reponame}-${today}${ext}"
		mksquashfs "${repodir}" "${file}" "${mksquashfs_options[@]}" "${!tmp}"
		mv "${file}" "${mirrordir}/"
	fi

	# Deltas are not supported for XZ
	if false && [[ "${algo}" != "xz" ]]; then
		if [[ ${yesterday} ]]; then
			# create rev-delta from today to yesterday
			squashdelta "${todaysnap}" "${yesterdaysnap}" \
				"${revdeltadir}/${reponame}-${today}-${yesterday}.${algo}.sqdelta"

			# create deltas from previous days to today
			revdeltas=( "${revdeltadir}"/*.${algo}.sqdelta )
			lastdelta=$(( ${#revdeltas[@]} - cleanupno ))
			for (( i = ${#revdeltas[@]} - 1; i >= 0; i-- )); do
				[[ ${i} != ${lastdelta} ]] || break

				r=${revdeltas[${i}]}
				ldate=${r#*/${reponame}-}
				rdate=${ldate%.${algo}.sqdelta}
				ldate=${ldate%-*}
				rdate=${rdate#*-}

				# ldate = newer, rdate = older

				rsnap=${tempdir}/${reponame}-${rdate}${ext}
				if [[ ${rdate} == "${yesterday}" ]]; then
					# we have yesterday's snapshot already, so use it
					cp "${yesterdaysnap}" "${rsnap}"
				else
					# otherwise, we need to reconstruct the snap
					lsnap=${tempdir}/${reponame}-${ldate}${ext}
					if [[ ${ldate} == "${yesterday}" ]]; then
						cp "${yesterdaysnap}" "${lsnap}"
					fi

					squashmerge "${lsnap}" "${r}" "${rsnap}"
					rm "${lsnap}"
				fi

				squashdelta "${rsnap}" "${todaysnap}" "${tempdir}/${reponame}-${rdate}-${today}.${algo}.sqdelta"
				mv "${tempdir}/${reponame}-${rdate}-${today}.${algo}.sqdelta" "${mirrordir}/"
				# remove the last snapshot used
				rm "${rsnap}"
			done


			# finally, clean up the old deltas
			rm -f "${mirrordir}/${reponame}"-*-"${yesterday}.${algo}.sqdelta"
		fi
	fi

	# == here ${PWD} becomes ${mirrordir} ==
	cd "${mirrordir}"

	# create convenience -current symlink, for direct fetching
	ln -s -f "${reponame}-${today}${ext}" "${reponame}-current${ext}"
done

# create checksums for snapshot and deltas
sha512sum -- *.sqfs *.sqdelta | \
	gpg --yes -u "${signkeyid}" --clearsign \
	--comment "Current: gentoo-${today}" --output sha512sum.txt.tmp -
mv sha512sum.txt.tmp sha512sum.txt