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