New aport ldpath
Utility to add or remove paths from musl dynamic linker config file
This commit is contained in:
Robert Yang
Oliver Smith
parent
2e7437825b
commit
75feba5476
3 changed files with 264 additions and 0 deletions
23
main/ldpath/APKBUILD
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23
main/ldpath/APKBUILD
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pkgname=ldpath
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pkgver=0.1
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pkgrel=0
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pkgdesc="Utility to add or remove paths from musl dynamic linker config file"
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url="https://postmarketos.org/"
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arch="noarch"
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license="MIT"
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source="
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ldpath.sh
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ldpath_test.sh
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"
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check() {
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sh ldpath_test.sh
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}
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package() {
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install -Dm755 "$srcdir/ldpath.sh" \
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"$pkgdir/usr/bin/ldpath"
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}
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sha512sums="0bf8a3bcbb314f54653921d1757b35dc582997a4c058033a390c8b8a520f44541ba1791775ef5a63706da1b8cb86018bb9c7c7effce1c4ea65a2d33896e583ff ldpath.sh
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e9ac37e88bc8fb6def9d550a58da0cc8c62dc14c49d6119e95560ff7d4c36eeb6dbbbce8006de6a170f6833b3ca54c80a2f173f67fefad4bf0927dc0a3d692b7 ldpath_test.sh"
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168
main/ldpath/ldpath.sh
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168
main/ldpath/ldpath.sh
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#!/bin/sh
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#
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# Add or remove paths from musl dynamic linker
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# path file (/etc/ld-musl-$ARCH.path)
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#
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# usage example:
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# $ ldpath.sh add /usr/lib/libdrm-grate
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default_ld_paths() {
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echo "/lib:/usr/local/lib:/usr/lib"
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}
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###############################################
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# Processor arch in the convention used by the
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# musl dynamic linker.
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# See musl source code: ldso/dynlink.c
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# Arguments:
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# kernel machine hardware name (uname -m)
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# Returns:
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# musl ldso processor arch
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###############################################
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kernel_arch_to_ldso_arch() {
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local karch=$1
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local ld_arch=""
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case "$karch" in
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armv7l)
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ld_arch=armhf
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;;
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*)
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ld_arch="$karch"
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;;
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esac
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echo "$ld_arch"
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}
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default_ld_musl_file() {
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local ld_arch
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ld_arch=$(kernel_arch_to_ldso_arch "$(uname -m)")
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echo "/etc/ld-musl-${ld_arch}.path"
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}
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###############################################
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# Prepend a path to dynamic linker path file
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# Arguments:
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# Shared library directory
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# ld musl path file
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###############################################
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add_path() {
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local ld_library_path=$1
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local ld_musl_file=$2
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# Don't allow duplicates
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if [ -f "$ld_musl_file" ]; then
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if grep -q "$ld_library_path" "$ld_musl_file"; then
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return 0
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fi
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fi
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if [ -f "$ld_musl_file" ]; then
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echo "${ld_library_path}:$(cat "$ld_musl_file")" > \
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"$ld_musl_file"
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else
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echo "${ld_library_path}:$(default_ld_paths)" > "$ld_musl_file"
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fi
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}
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###############################################
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# Remove a path from dynamic linker path file
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# Arguments:
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# Shared library directory
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# ld musl path file
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###############################################
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remove_path() {
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local ld_library_path=$1
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local ld_musl_file=$2
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local conf
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if [ ! -f "$ld_musl_file" ]; then
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return 0
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fi
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# Don't remove default paths
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if default_ld_paths | grep -q "$ld_library_path"; then
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return 0
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fi
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conf=$(awk -v ld_path="$ld_library_path" '{n=split($0, array, ":")} END {
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for (i in array) {
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if (array[i]!=ld_path) {
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printf array[i]
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if (i<n)
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printf ":"
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}
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}
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}' < "$ld_musl_file")
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echo "$conf" > "$ld_musl_file"
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}
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print_usage() {
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local ld_arch
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ld_arch=$(kernel_arch_to_ldso_arch "$(uname -m)")
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echo "usage: $(basename "$1") [-h] [-f FILE] {add,remove} LD_LIBRARY_PATH"
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echo ""
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echo "Add or remove LD_LIBRARY_PATH in $(default_ld_musl_file)"
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echo ""
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echo "optional arguments:"
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echo " -h, --help show this help message and exit"
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echo " -f, --file override ld musl path file"
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}
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parse_args() {
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local have_file_arg=""
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while [ "${1:-}" != "" ]; do
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case $1 in
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add|remove)
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ldpath_func="$1"
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ldpath_arg="$2"
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shift
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shift
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;;
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-f|--file)
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have_file_arg="1"
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ld_musl_file="$2"
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shift
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shift
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;;
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-h|--help)
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shift
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return 0
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;;
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*)
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echo "Invalid argument: $1"
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shift
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return 0
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;;
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esac
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done
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if [ -z "$ldpath_func" ] || [ -z "$ldpath_arg" ]; then
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return 0
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fi
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if [ "$have_file_arg" = "1" ] &&
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[ -z "$ld_musl_file" ]; then
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return 0
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fi
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return 1
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}
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main() {
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if [ -z "$ld_musl_file" ]; then
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ld_musl_file=$(default_ld_musl_file)
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fi
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if [ "$ldpath_func" = "add" ]; then
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add_path "$ldpath_arg" "$ld_musl_file"
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elif [ "$ldpath_func" = "remove" ]; then
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remove_path "$ldpath_arg" "$ld_musl_file"
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fi
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}
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if parse_args "$@"; then
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print_usage "$0"
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return 1
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fi
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main "$0"
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73
main/ldpath/ldpath_test.sh
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73
main/ldpath/ldpath_test.sh
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#!/bin/sh
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testdir=$(mktemp -d)
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ld_musl_file="${testdir}/ld-musl-test.path"
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lib_path="/usr/lib/foo"
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lib_path2="/usr/lib/bar"
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# Create ldso config file and add a path to it.
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sh ldpath.sh -f "$ld_musl_file" add "$lib_path"
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if ! grep -q "$lib_path" "$ld_musl_file"; then
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echo "ERROR: Did not find $lib_path in newly created config file."
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exit 1
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fi
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# Add another path to config file.
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sh ldpath.sh -f "$ld_musl_file" add "$lib_path2"
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if ! grep -q "$lib_path2" "$ld_musl_file"; then
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echo "ERROR: Did not find $lib_path2 in config file."
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exit 1
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fi
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# Check that first path is still present
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if ! grep -q "$lib_path" "$ld_musl_file"; then
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echo "ERROR: Did not find $lib_path in config file."
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exit 1
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fi
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# Remove the first path
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sh ldpath.sh -f "$ld_musl_file" remove "$lib_path"
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if grep -q "$lib_path" "$ld_musl_file"; then
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echo "ERROR: $lib_path was not removed from config file."
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exit 1
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fi
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# Check that second path is still present
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if ! grep -q "$lib_path2" "$ld_musl_file"; then
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echo "ERROR: $lib_path2 should not have been removed."
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exit 1
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fi
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# Remove the second path
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sh ldpath.sh -f "$ld_musl_file" remove "$lib_path2"
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if grep -q "$lib_path2" "$ld_musl_file"; then
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echo "ERROR: $lib_path2 was not removed from config file."
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exit 1
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fi
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# Don't allow removal of default paths
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_default_paths="/lib /usr/local/lib /usr/lib"
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for _path in $_default_paths
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do
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sh ldpath.sh -f "$ld_musl_file" remove "$_path"
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if ! grep -q "$_path" "$ld_musl_file"; then
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echo "ERROR: Default path $_path should not have been removed."
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exit 1
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fi
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done
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# Don't allow duplicates
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sh ldpath.sh -f "$ld_musl_file" add "$lib_path"
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sh ldpath.sh -f "$ld_musl_file" add "$lib_path"
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_count=$(grep -o "$lib_path" "$ld_musl_file" | wc -l)
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if [ "$_count" -ne 1 ]; then
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echo "ERROR: Multiple entries of $lib_path."
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exit 1
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fi
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# Cleanup
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rm -r "$testdir"
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exit 0
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