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#!/bin/sh

PROGRAM=setup-apkrepos
PREFIX=

. $PREFIX/lib/libalpine.sh

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MIRRORS_PATH=/usr/share/alpine-mirrors/MIRRORS.txt
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if [ -z "$MIRRORS" ] && [ -r "$MIRRORS_PATH" ]; then
	MIRRORS=`cat $MIRRORS_PATH`
fi
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RELEASES_PATH=/usr/share/alpine-mirrors/RELEASES.txt
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if [ -z "$RELEASES" ] && [ -r "$RELEASES_PATH" ]; then
	RELEASES=`cat $RELEASES_PATH`
fi
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APKREPOS_PATH=/etc/apk/repositories
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if [ -r "$APKREPOS_PATH" ]; then
	APKREPOS=`cat "$APKREPOS_PATH"`
fi
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get_hostname_from_url() {
	local n=${1#*://}
	echo ${n%%/*}
}

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prompt_setup_method() {
	while true; do
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		echo "How would you like to set up internet apk repositories?"
		echo -e "r) Automatically pick a random mirror"
		echo -e "f) Automatically pick the fastest mirror (must be connected)"
		echo -e "l) Manually pick mirror from list"
		echo -e "e) Manually enter local/remote mirror(s)"
		echo -e "n) Do not configure internet apk repositories at all"
		echo -en "\nPlease select how to setup APK repositories (r/f/l/e/n) [n]: "
		default_read setup_method n
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		case "$setup_method" in
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			r|f|l|e|n) break;;
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		esac
	done
}

get_random_mirror() {
	local i=0
	local mirror_count=`echo $MIRRORS | sed 's/ /\n/g' | wc -l`
	local random_mirror_index=`expr $RANDOM % $mirror_count`
	local random_mirror_hostname
	
	echo -n "Picking random mirror... "
	for mirror in $MIRRORS; do
		if [ $i -eq $random_mirror_index ]; then
			break
		fi
		i=`expr $i + 1`
	done

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	echo "using $(get_hostname_from_url $mirror)"
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}

get_fastest_mirror() {
	local mirror_hostname
	local tmp_mirror_nslookup
	local tmp_mirror_time
	local tmp_mirror_time_failed
	local tmp_mirror_rtt
	local mirror_lowest_rtt
	local mirror_lowest_rtt_hostname
	local mirror_lowest_rtt_mirror

	echo -n "Finding fastest mirror... "
	mirror_lowest_rtt=-1
	for mirror in $MIRRORS; do
		mirror_hostname=`echo $mirror | awk -F '://' '{print $2}' | awk -F '/' '{print $1}'`
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		tmp_mirror_time="`(time wget -qO - $mirror) 2>&1 || echo "E_MIRROR_FAILED"`"
		tmp_mirror_time_failed=`echo $tmp_mirror_time | grep "E_MIRROR_FAILED"`
		if [ ${#tmp_mirror_time_failed} -eq 0 ]; then
			tmp_mirror_rtt=`echo "$tmp_mirror_time" | grep -E "^real" | sed -r "s/^real[ 	]+[0-9]+m[ 	]+([0-9]+)\.([0-9]+)s$/\1\2/"`
			if [ $mirror_lowest_rtt -eq -1 ]; then
				mirror_lowest_rtt=$tmp_mirror_rtt
				mirror_lowest_rtt_hostname=$mirror_hostname
				mirror_lowest_rtt_mirror=$mirror
			else
				if [ $tmp_mirror_rtt -lt $mirror_lowest_rtt ]; then
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					mirror_lowest_rtt=$tmp_mirror_rtt
					mirror_lowest_rtt_hostname=$mirror_hostname
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					mirror_lowest_rtt_mirror=$mirror
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				fi
			fi
		fi
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	done
	echo "using $mirror_lowest_rtt_hostname."
	mirror=$mirror_lowest_rtt_mirror
}

prompt_mirror_list() {
	local i
	local mirror_hostname
	local mirror_index
	local mirror_count=`echo $MIRRORS | sed 's/ /\n/g' | wc -l`

	while true; do
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		echo ""
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		i=1
		for mirror in $MIRRORS; do
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			echo "$i) $(get_hostname_from_url $mirror)"
			i=$(($i + 1))
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		done

		echo -en "\nPlease select a mirror from the above list: "
		read mirror_index
		case $mirror_index in
			[1-9]|[1-9][0-9])
				if [ $mirror_index -ge 1 -a $mirror_index -le $mirror_count ]; then
					break
				fi
				;;
		esac
	done

	set $MIRRORS
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	eval "mirror=\$$mirror_index"
	echo "Mirror chosen: $(get_hostname_from_url $mirror)"
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}

add_repo() {
	local new_repo=$1

	if [ ${#new_repos} -eq 0 ]; then
		new_repos="$new_repo"
	else
		new_repos=`echo -e "$new_repos\n$new_repo"`
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	fi
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}

prompt_custom_mirror() {
	local start_fresh=$1
	local called_by_self=${2-0}
	local new_repo
	local add_another

	while true; do
		echo -e "\nPlease enter a local path or URL to the mirror:"
		read new_repo
		case "$new_repo" in
			/*|http://*|ftp://*|https://*)
				# Allow for local paths and http/ftp/https URLs
				break;;
		esac
	done

	add_repo "$new_repo"
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	while true; do
		echo -en "\nDo you want to add another mirror? [y/n]: "
		read add_another
		case "$add_another" in
			[yY]) prompt_custom_mirror 0 1; break;;
			[nN]) break;;
		esac
	done
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	if [ $called_by_self -eq 0 ]; then
		echo -n "Updating ${APKREPOS_PATH}... "
		if [ $start_fresh -eq 1 ]; then
			echo "$new_repos" > "$APKREPOS_PATH" || die "failed."
		elif [ $start_fresh -eq 0 ]; then
			echo "$new_repos" >> "$APKREPOS_PATH" || die "failed."
		fi
		echo "done."
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	fi
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}

prompt_clear_repositories() {
	local start_fresh

	while true; do
		echo -en "\nBefore adding custom mirrors, do you want to clear\n"
		echo -n "${APKREPOS_PATH} and start fresh? [y/n]: "
		read start_fresh
		case "$start_fresh" in
			[yY]) start_fresh=1; break;;
			[nN]) start_fresh=0; break;;
		esac
	done

	prompt_custom_mirror $start_fresh
}

prompt_alpine_release() {
	local i
	local release_index
	local release_count=`echo $RELEASES | sed 's/ /\n/g' | wc -l`

	while true; do
		echo -en "\n"
		i=1
		for _release in $RELEASES; do
			echo "$i) $_release"
			i=`expr $i + 1`
		done
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		echo -n "Please select a release from the above list: "
		read release_index
		case "$release_index" in
			[1-9]|[1-9][0-9])
				if [ $release_index -ge 1 -a $release_index -le $release_count ]; then
					break
				fi
				;;
		esac
	done

	set $RELEASES
	_tmp="\$$release_index"
	release=`eval echo $_tmp`

	echo "Release chosen: $release"
}

get_alpine_release() {
	local change_release

	release=`apk version "alpine-base" 2>/dev/null | sed -r -e '/alpine-base/!d' -e 's/alpine-base-//' -e 's/^([^ 	]+)-r[0-9]+[ 	]*=.*$/\1/'`
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	case "$release" in
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		*_git*) release="edge";;
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		[0-9]*.[0-9]*.[0-9]*)
			# release in x.y.z format, cut last digit
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			release=v${release%.[0-9]*};;
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	esac
	while true; do
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		echo -en "\nSystem release is: $release.  Change? (i.e., to upgrade) [y/N]: "
		default_read change_release "n"
		case "$change_release" in
			[nN]) break;;
			[yY]) prompt_alpine_release; break;;
		esac
	done
}
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update_apk_repositories() {
	new_repos=
	local apkrepo
	local new_repo
	local main_repo_exists=0
	local testing_repo_exists=0
	local enable_testing

	# Prompt user to enable the testing repo.
	while true; do
		echo -en "\nDo you want to enable the testing repository? [y/N]: "
		default_read enable_testing "n"
		case "$enable_testing" in
			[yY]) enable_testing=1; break;;
			[nN]) enable_testing=0; break;;
		esac
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	done

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	# Update existing repositories to the new mirror selection
	echo -n "Updating ${APKREPOS_PATH}... "
	for apkrepo in $APKREPOS; do
		case "$apkrepo" in
			*/alpine/*/main*)
				new_repo="${mirror}${release}/main"
				main_repo_exists=1
				;;
			*/alpine/*/testing*)
				if [ $enable_testing -eq 1 ]; then
					new_repo="${mirror}${release}/testing"
				else
					new_repo="#${mirror}${release}/testing"
				fi
				testing_repo_exists=1
				;;
			*)
				new_repo="$apkrepo"
				;;
		esac
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		add_repo "$new_repo"
	done
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	# Add main repo if not found
	if [ $main_repo_exists -eq 0 ]; then
		add_repo "${mirror}${release}/main"
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	fi

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	# Add testing repo if not found
	if [ $testing_repo_exists -eq 0 ]; then
		if [ $enable_testing -eq 1 ]; then
			add_repo "${mirror}${release}/testing"
		else
			add_repo "#${mirror}${release}/testing"
		fi
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	fi
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	# Update repositories file
	echo "$new_repos" > "$APKREPOS_PATH" || die "failed."
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	echo "done."
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}

prompt_update_apk() {
	while true; do
		echo -e "\nDo you want to update repository indexes?"
		echo -n "(You must be connected when using remote repositories.) [y/N]: "
		default_read update_repo_indexes "n"
		case "$update_repo_indexes" in
			[yY])
				echo -n "Updating repository indexes... "
				local apkupdate_errors=`apk update 2>&1 | grep -E "^(WARNING|ERROR)" | sed -r "s/(WARNING|ERROR)/\n\1/g"`
				if [ ${#apkupdate_errors} -gt 0 ]; then
					echo "$apkupdate_errors"
				else
					echo "done."
				fi
				break
			;;
			[nN]) break;;
		esac
	done
}

# main
prompt_setup_method

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case "$setup_method" in
	r) get_random_mirror;;
	f) get_fastest_mirror;;
	l) prompt_mirror_list;;
	e) prompt_clear_repositories;;
esac
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if [ "$setup_method" != "e" ]; then
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	# It doesn't make sense to run get_alpine_release for custom_mirror
	get_alpine_release

	# prompt_custom_mirror() will update the apk repositories file instead
	update_apk_repositories
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fi
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prompt_update_apk