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#!/bin/sh
PREFIX=
. "$PREFIX/lib/libalpine.sh"
usage() {
cat <<__EOF__
usage: setup-apkcache [-h] [DIR]
Setup apk caching.
If DIR is not specified user will be asked for location.
options:
-h Show this help
__EOF__
exit 1
}
is_mounted() {
awk '{print $2}' /proc/mounts | grep -q "^$1$"
}
find_fstab_mount_point() {
local dir="$1"
local res=
while [ -n "$dir" ]; do
res=$(awk "\$2 == \"$dir\" {print \$2}" /etc/fstab)
if [ -n "$res" ]; then
echo $res
return
fi
dir=${dir%/*}
done
}
# figure out mount point
find_mount_point() {
local dir=$(find_fstab_mount_point $1)
if [ -d "$dir" ] && [ "$dir" != "/" ]; then
echo $dir
return
fi
local dir="$1"
while ! [ -d "$dir" ]; do
dir=${dir%/*}
done
local fs_id=$(stat -f -c %i "$dir")
local parent="${dir%/*}"
while [ -n "$dir" ] && [ "$(stat -f -c %i $parent/)" = "$fs_id" ]; do
dir=$parent
parent=${parent%/*}
done
[ -z "$dir" ] && dir=/
echo $dir
}
get_mount_opts() {
local mnt="$1"
awk "\$2 == \"$mnt\" {gsub(/,/, \" \", \$4); print \$4}" /proc/mounts
}
is_mounted_ro() {
local mnt="$1"
local opts=$(get_mount_opts $mnt)
local opt=
for opt in $opts; do
if [ "$opt" = "ro" ]; then
return 0
fi
done
return 1
}
# get the fstype of the given mount point
mount_fstype() {
# we only want the last mount in case there are several
awk -v mnt="$1" '$2 == "/" {fstype = mnt} END {print fstype}' \
/proc/mounts
}
apk_cache_help() {
cat <<__EOF__
Packages installed from network can be cached locally to be available during
boot, before the network is started. Specifying a directory here will make apk
cache the packages locally in this directory.
Enter 'none' if you do not want to cache packages from network.
__EOF__
}
while getopts "h" opt; do
case $opt in
h) usage;;
esac
done
shift $(( $OPTIND - 1 ))
# try auto detetect what we suggest
suggestion=
if [ -L /etc/apk/cache ]; then
suggestion=$(readlink /etc/apk/cache)
fi
if [ -z "$suggestion" ] && [ -f /etc/lbu/lbu.conf ]; then
. /etc/lbu/lbu.conf
if [ -n "$LBU_MEDIA" ]; then
suggestion=/media/$LBU_MEDIA/cache
fi
fi
if [ -z "$suggestion" ] && [ -L /dev/usbdisk ]; then
suggestion=/media/usb/cache
fi
if [ -z "$suggestion" ] && [ "$(mount_fstype /)" != "tmpfs" ]; then
suggestion=/var/cache/apk
fi
if [ -z "$suggestion" ]; then
suggestion=none
fi
cachedir=$1
while [ -z "$cachedir" ]; do
echo -n "Enter apk cache directory (or '?' or 'none') [$suggestion]: "
default_read cachedir $suggestion
if [ "$cachedir" = "?" ]; then
apk_cache_help
cachedir=
fi
done
if [ "$cachedir" = "none" ]; then
exit 0
fi
mount=$(find_mount_point $cachedir)
cleanup=
if ! is_mounted $mount; then
mount $mount || exit 1
cleanup="umount"
elif is_mounted_ro $mount; then
mount -o remount,rw $mount || exit 1
cleanup="remount"
fi
mkdir -p $cachedir
if [ -L /etc/apk/cache ]; then
rm -f /etc/apk/cache
fi
ln -s $cachedir /etc/apk/cache
case "$cleanup" in
umount) umount $mount;;
remount) mount -o remount,ro $mount;;
esac
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