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157 lines
3.8 KiB
157 lines
3.8 KiB
# -*-eselect-*- vim: ft=eselect
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# Copyright 1999-2018 Gentoo Foundation
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# Distributed under the terms of the GNU General Public License v2
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DESCRIPTION="Manage /usr/bin/unison versions"
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MAINTAINER="ml@gentoo.org"
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VERSION="0.4"
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# find a list of unison symlink targets, best first
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find_targets() {
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local f
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for f in "${EROOT}"/usr/bin/unison-[0-9]*; do
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if [[ -f ${f} ]] ; then
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echo "${f##*/unison-}"
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fi
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done | tac
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}
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# find version number of currently symlinked version
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identify_target() {
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local f
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f="$(canonicalise "${EROOT}"/usr/bin/unison)"
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echo "${f##*/unison-}"
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}
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function is_link_or_empty() {
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if [[ ! -e "$1" ]] || [[ -L "$1" ]]; then
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return 0
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else
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return 1
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fi
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}
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# set the unison symlink
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set_symlinks() {
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local target="${1}" targets
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if is_number "${target}" && [[ ${target} -ge 1 ]] ; then
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targets=( $(find_targets) )
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target=${targets[target - 1]}
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fi
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if [[ -f "${EROOT}/usr/bin/unison-${target}" ]] ; then
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ln -sf "unison-${target}" "${EROOT}/usr/bin/unison" || \
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die "Could not set ${target} /usr/bin/unison symlink"
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else
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die -q "Target \"${target}\" doesn't appear to be valid!"
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fi
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# If unison-fsmonitor isn't a symlink, it means that we still have a
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# unison version (<2.48-r1) that doesn't properly slot that binary.
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# Don't mess with it if that's the case.
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if is_link_or_empty "${EROOT}/usr/bin/unison-fsmonitor" ; then
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# not a regular file. safe to symlink.
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ln -sf "unison-fsmonitor-${target}" \
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"${EROOT}/usr/bin/unison-fsmonitor" \
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|| die "Could not set ${target} /usr/bin/unison-fsmonitor symlink"
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fi
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}
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### show action ###
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describe_show() {
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echo "Show the current unison version"
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}
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do_show() {
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[[ -z "${@}" ]] || die -q "Too many parameters"
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write_list_start "Current unison verson:"
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if [[ -L "${EROOT}/usr/bin/unison" ]] ; then
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write_kv_list_entry "$(identify_target)" ""
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elif [[ -e "${EROOT}/usr/bin/unison" ]] ; then
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write_kv_list_entry "(not a symlink)" ""
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else
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write_kv_list_entry "(unset)" ""
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fi
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}
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### list action ###
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describe_list() {
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echo "List available unison versions"
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}
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do_list() {
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[[ $# -eq 0 ]] || die -q "Too many parameters"
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local i targets current
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targets=( $(find_targets ) )
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current=$(identify_target)
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for (( i = 0; i < ${#targets[@]}; i++ )); do
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[[ ${targets[i]} = ${current} ]] \
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&& targets[i]=$(highlight_marker "${targets[i]}")
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done
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write_list_start "Available unison versions:"
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write_numbered_list -m "(none found)" "${targets[@]}"
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}
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### set action ###
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describe_set() {
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echo "Set a new unison version"
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}
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describe_set_options() {
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echo "target : Target version number or index from 'list' action"
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}
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describe_set_parameters() {
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echo "<target>"
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}
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do_set() {
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if [[ -z "${1}" ]] ; then
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die -q "You didn't give me a version number"
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elif [[ -n "${2}" ]] ; then
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die -q "Too many parameters"
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elif [[ -L "${EROOT}/usr/bin/unison" ]] ; then
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if ! set_symlinks "${1}" ; then
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die -q "Can't set new version"
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fi
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elif [[ -e "${EROOT}/usr/bin/unison" ]] ; then
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die -q "${EROOT}/usr/bin/unison seems to be from an old ebuild, please remove manually"
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else
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set_symlinks "${1}" || die -q "Can't set new version"
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fi
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}
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### update action ###
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describe_update() {
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echo "Automatically update the unison version number"
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}
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describe_update_options() {
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echo "--if-unset : Do not override currently selected version"
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}
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do_update() {
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[[ -z "${1}" ]] || ( [[ -z "${2}" ]] && [[ "${1}" == "--if-unset" ]] ) || \
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die -q "Usage error"
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if [[ -L "${EROOT}/usr/bin/unison" ]] && [[ ${1} == "--if-unset" ]]; then
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return
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fi
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if ! is_link_or_empty "${EROOT}/usr/bin/unison" ; then
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die -q "${EROOT}/usr/bin/unison seems to be from an old ebuild, please remove manually"
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elif [[ -z $(find_targets ) ]] ; then
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rm -f "${EROOT}/usr/bin/unison"
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rm -f "${EROOT}/usr/bin/unison-fsmonitor"
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else
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set_symlinks 1 || die -q "Can't set a new version"
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fi
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}
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