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# -*-eselect-*- vim: ft=eselect
# Copyright 2005-2014 Gentoo Foundation
# Distributed under the terms of the GNU GPL version 2 or later
DESCRIPTION="Manage the /usr/src/linux symlink"
MAINTAINER="eselect@gentoo.org"
# sort function for kernel versions, to be used in a pipe
sort_kernel_versions() {
local vsort="sort --version-sort"
# Test if our sort supports the --version-sort option
# (should be GNU sort, since the kernel module is GNU/Linux specific)
${vsort} </dev/null &>/dev/null || vsort=sort
# We sort kernel versions as follows:
# 1. Run sed to prepend the version string by the numeric version
# and an additional rank indicator that is 0 for release candidates
# or 1 otherwise. After this step we have, for example:
# 2.6.29 1 linux-2.6.29
# 2.6.29 0 linux-2.6.29-rc8
# 2. sort --version-sort
# 3. Run sed again to remove the prepended keys from step 1.
sed -e 's/^\(linux-\)\?\([[:digit:].]\+\)[-_]rc/\2 0 &/' \
-e 't;s/^\(linux-\)\?\([[:digit:].]\+\)/\2 1 &/' \
| LC_ALL=C ${vsort} | sed 's/.* //'
}
# find a list of kernel symlink targets
find_targets() {
local f
for f in "${EROOT}"/usr/src/linux-[[:digit:]]*; do
[[ -f ${f}/Makefile ]] && basename "${f}"
done | sort_kernel_versions
}
# remove the kernel symlink
remove_symlink() {
rm "${EROOT}/usr/src/linux"
}
# set the kernel symlink
set_symlink() {
local target=$1
if is_number "${target}"; then
local targets=( $(find_targets) )
target=${targets[target-1]}
fi
if [[ -z ${target} ]]; then
die -q "Target \"$1\" doesn't appear to be valid!"
elif [[ -f ${EROOT}/usr/src/${target}/Makefile ]]; then
ln -s "${target}" "${EROOT}/usr/src/linux"
elif [[ -f ${EROOT}/usr/src/linux-${target}/Makefile ]]; then
ln -s "linux-${target}" "${EROOT}/usr/src/linux"
else
die -q "Target \"$1\" doesn't appear to be valid!"
fi
}
### show action ###
describe_show() {
echo "Show the current kernel symlink"
}
do_show() {
write_list_start "Current kernel symlink:"
if [[ -L ${EROOT}/usr/src/linux ]]; then
local kernel=$(canonicalise "${EROOT}/usr/src/linux")
write_kv_list_entry "${kernel%/}" ""
[[ -f ${kernel}/Makefile ]] \
|| write_warning_msg "Symlink target doesn't appear to be valid!"
else
write_kv_list_entry "(unset)" ""
fi
}
### list action ###
describe_list() {
echo "List available kernel symlink targets"
}
do_list() {
local i targets=( $(find_targets) )
write_list_start "Available kernel symlink targets:"
for (( i = 0; i < ${#targets[@]}; i++ )); do
[[ ${targets[i]} = \
$(basename "$(canonicalise "${EROOT}/usr/src/linux")") ]] \
&& targets[i]=$(highlight_marker "${targets[i]}")
done
write_numbered_list -m "(none found)" "${targets[@]}"
}
### set action ###
describe_set() {
echo "Set a new kernel symlink target"
}
describe_set_parameters() {
echo "<target>"
}
describe_set_options() {
echo "target : Target name or number (from 'list' action)"
}
do_set() {
[[ -z $1 ]] && die -q "You didn't tell me what to set the symlink to"
[[ $# -gt 1 ]] && die -q "Too many parameters"
if [[ -L ${EROOT}/usr/src/linux ]]; then
# existing symlink
remove_symlink || die -q "Couldn't remove existing symlink"
set_symlink "$1" || die -q "Couldn't set a new symlink"
elif [[ -e ${EROOT}/usr/src/linux ]]; then
# we have something strange
die -q "${EROOT}/usr/src/linux exists but is not a symlink"
else
set_symlink "$1" || die -q "Couldn't set a new symlink"
fi
}
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