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#!/bin/sh
libdir=/usr/lib/calibre
bindir=/usr/lib/calibre/bin
die() {
echo "${1}" >&2
exit 1
}
usage() {
cat <<- __EOF__
usage: calibre-alternatives [help|get]
usage: calibre-alternatives set [2|3]
Set the default python interpreter for calibre, either python2 or python3.
__EOF__
}
get_current() {
currentdir=$(readlink "${libdir}/bin")
echo "${currentdir##*-py}"
}
find_alternative() {
for i in 2 3; do
if [ -d "${libdir}/bin-py${i}" ]; then
echo "${i}"
return 0
fi
done
return 1
}
set_current() {
alt=${1}
if [ -z "${alt}" ]; then
[ -z "$(get_current)" ] || exit 0 # nothing to do
alt=$(find_alternative) || die "error: no alternatives exist"
fi
if ! [ $(id -u) = 0 ]; then
die "error: cannot set without being root"
fi
if [ -d "${libdir}/bin-py${alt}" ]; then
ln -snvf bin-py${alt} "${libdir}/bin"
else
die "alternative '${alt}' does not exist"
fi
}
case ${1} in
help)
usage;;
''|get)
get_current;;
set)
shift; set_current "${1}";;
*)
die "invalid option: '${1}'"
esac
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