1 files changed, 138 insertions, 0 deletions
diff --git a/functions/debian-snapshot.sh b/functions/debian-snapshot.sh
new file mode 100755
index 000000000..7bdf5e2f5
--- /dev/null
+++ b/functions/debian-snapshot.sh
@@ -0,0 +1,138 @@
+#!/bin/sh
+
+## live-build(7) - System Build Scripts
+## Copyright (C) 2006-2012 Daniel Baumann <daniel@debian.org>
+##
+## live-build comes with ABSOLUTELY NO WARRANTY; for details see COPYING.
+## This is free software, and you are welcome to redistribute it
+## under certain conditions; see COPYING for details.
+
+Short_date ()
+{
+	SHORT_DATE="${1}:-${LB_SNAPSHOT}}"
+	# returns the date as YYYYMMDD
+	echo "${SHORT_DATE}" | cut -c 1-8
+}
+
+Last_archive_entry ()
+{
+	# returns the last date link
+	LAST_ENTRY="$(cat /tmp/index.html | grep "$(date +%Y%m)" | sed 's|.*<a href="\([^"]*\)".*$|\1|' | tail -n 1 )"
+	echo "$( echo ${LAST_ENTRY} | sed 's|./||' | sed 's|/||' )"
+}
+
+First_archive_entry ()
+{
+	# returns the 1st date link (1st line is daily-images in daily installer html)
+	FIRST_ENTRY="$(cat /tmp/index.html | grep DIR | sed 's|.*<a href="\([^"]*\)".*$|\1|' | head -n 2 | tail -n 1 )"
+	echo "$( echo ${FIRST_ENTRY} | sed 's|./||' | sed 's|/||' )"
+}
+
+Previous_date ()
+{
+	INITIAL_DATE="${1}"
+
+	# convert date to seconds
+	UNIX_TIME=$(date -d "$INITIAL_DATE" +%s)
+	# one day is 86400 secs
+	#ONE_DAY=$(( 24 * 3600 ))
+	ONE_DAY=86400
+
+	# subtract one day to date
+	PREVIOUS_DATE=$(date -d "$INITIAL_DATE -$ONE_DAY sec" "+%Y%m%d")
+
+	# return previous date
+	echo "${PREVIOUS_DATE}"
+}
+
+Dated_archive_entry ()
+{
+	# returns the link for a specific date
+	WANTED_DATE="${1}:-${LB_SNAPSHOT}}"
+	DATED_ENTRY="$(cat /tmp/index.html | grep "$(Short_date ${WANTED_DATE})" | sed 's|.*<a href="\([^"]*\)".*$|\1|' | tail -n 1 )"
+	echo "$( echo ${DATED_ENTRY} | sed 's|./||' | sed 's|/||' )"
+}
+
+Previous_archive_entry ()
+{
+	# returns the link for the match or the previous entry before specific date
+	FIRST_DATE="$(Short_date $(First_archive_entry))"
+
+	DATE="$(Short_date ${LB_SNAPSHOT})"
+
+	# if there is no daily installer available for
+	# a very old date, then use the oldest daily installer
+	# available, even with kernel mismatch.
+	if [ ${DATE} -le ${FIRST_DATE} ]
+	then
+		DATE=${FIRST_DATE}
+	fi
+
+	while [ "${DATE}" != "${FIRST_DATE}" ]; do
+		LINK=$(cat /tmp/index.html |  grep "${DATE}" | sed 's|.*<a href="\([^"]*\)".*$|\1|' )
+
+		if [ -z "${LINK}" ]
+		then
+			# date was not found
+			# try previous date
+			DATE=$(Previous_date "${DATE}")
+		else
+			# a link was found
+			break
+		fi
+	done
+
+	# return link to matched date or previous daily installer date,
+	# the 1st one if no other younger d-i for that date was found
+	Dated_archive_entry "${DATE}"
+}
+
+Latest_debian_archive_snapshot_available ()
+{
+	# returns the complete date/time for the link of the latest (last) available debian archive snapshot date
+	wget 'http://snapshot.debian.org/archive/debian/?year='"$(date +%Y)"';month='"$(date +%m)" -O /tmp/index.html && true
+	LAST_ARCHIVE_SNAPSHOT="$(Last_archive_entry)"
+	echo "${LAST_ARCHIVE_SNAPSHOT}"
+}
+
+Dated_debian_archive_snapshot ()
+{
+	# returns the complete date/time for the link of the latest for a specific date in snapshot.debian.org
+	DATE_YEAR="$(Short_date ${LB_SNAPSHOT} | cut -c 1-4 )"
+	DATE_MONTH="$(Short_date ${LB_SNAPSHOT} | cut -c 5-6 )"
+	wget 'http://snapshot.debian.org/archive/debian/?year='"${DATE_YEAR}"';month='"${DATE_MONTH}" -O /tmp/index.html && true
+	LAST_ARCHIVE_SNAPSHOT="$(Dated_archive_entry)"
+	echo "${LAST_ARCHIVE_SNAPSHOT}"
+}
+
+Latest_debian_installer_snapshot_available ()
+{
+	# returns the date-hour for the latest date of debian-installer daily build available for an arch
+	# d-i archive uses different date links
+	wget 'http://d-i.debian.org/daily-images/'"${LIVE_IMAGE_ARCHITECTURE}" -O /tmp/index.html && true
+	LAST_INSTALLER_SNAPSHOT="$(Last_archive_entry)"
+	echo "${LAST_INSTALLER_SNAPSHOT}"
+}
+
+Dated_debian_installer_snapshot ()
+{
+	# returns the date-hour for the specific date of debian-installer daily build available for an arch
+	# d-i archive uses different date links
+	wget 'http://d-i.debian.org/daily-images/'"${LIVE_IMAGE_ARCHITECTURE}" -O /tmp/index.html && true
+	DATED_INSTALLER_SNAPSHOT="$(Dated_archive_entry)"
+	echo "${DATED_INSTALLER_SNAPSHOT}"
+}
+
+Available_daily_installer ()
+{
+	# returns the desired daily d-i date link or the previous existing daily d-i
+	DAILY_INSTALLER="$(Dated_debian_installer_snapshot)"
+	if [ -z "${DAILY_INSTALLER}" ]
+	then
+		# no wanted date was found, download available dates and search previous
+		wget 'http://d-i.debian.org/daily-images/'"${LIVE_IMAGE_ARCHITECTURE}" -O /tmp/index.html && true
+		DAILY_INSTALLER=$(Previous_archive_entry)
+	fi
+
+	echo "${DAILY_INSTALLER}"
+}