sys-libs/musl: Support Gentoo prefix

Added necessary framework to get this libc to run properly under a prefix.

Closes: https://bugs.gentoo.org/833192
Signed-off-by: Esteve Varela Colominas <esteve.varela@gmail.com>
Closes: https://github.com/gentoo/gentoo/pull/24169
Signed-off-by: Sam James <sam@gentoo.org>

1 files changed, 160 insertions, 0 deletions

diff --git a/sys-libs/musl/files/ldconfig.in-r3 b/sys-libs/musl/files/ldconfig.in-r3
new file mode 100644
index 000000000000..60f6cc9e1130
--- /dev/null
+++ b/sys-libs/musl/files/ldconfig.in-r3
@@ -0,0 +1,160 @@
+#!/bin/bash -e
+# Copyright 1999-2022 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+ROOT="/"
+EPREFIX="@GENTOO_PORTAGE_EPREFIX@"
+LDSO_CONF_FILE="/etc/ld.so.conf"
+
+VERBOSE=0
+
+UPDATE_LINKS=1
+
+get_options() {
+	LDSO_CONF=""
+	while getopts "vnNXf:C:r:p" opt "$@"; do
+		case $opt in
+		v)
+			echo "ldconfig for musl in Gentoo"
+			VERBOSE=1
+			;;
+		r)
+			ROOT=${OPTARG}
+			;;
+		f)
+			LDSO_CONF=${OPTARG}
+			;;
+		X)
+			UPDATE_LINKS=0
+			;;
+		\?)
+			echo "Invalid option: -${opt}" >&2
+			exit 1
+			;;
+		n|N|C|p)
+			echo "Unimplemented option: -${opt}" >&2
+			exit 1
+			;;
+		esac
+	done
+	if [[ -z ${LDSO_CONF} ]]; then
+		LDSO_CONF=${ROOT}${EPREFIX}${LDSO_CONF_FILE}
+	fi
+
+	if [[ ${UPDATE_LINKS} == 1 ]]; then
+		echo "Updating links is not implemented."
+	fi
+}
+
+
+repeated() {
+	local l=${1}
+	local drs="${@:2}"
+	for m in ${drs}; do
+		[[ ${m} == ${l} ]] && return 0
+	done
+	return 1
+}
+
+expand() {
+	# We are assuming the ld.so.conf's 'include' is not recursive
+	local f line l
+	local glob="${LDSO_CONF_DIR}/${1}"
+	local drs="${@:2} "
+
+	for f in ${glob}; do
+		[[ ! -f ${f} ]] && continue
+		while read line; do
+			line=${line%%#*}
+			line=${line//:/ }
+			line=${line//,/ }
+			for l in ${line}; do
+				# We must add this whether or not the directory exists
+				repeated ${l} ${drs} && continue
+				drs+=" ${l} "
+			done
+		done < ${f}
+	done
+
+	echo ${drs}
+}
+
+read_ldso_conf() {
+	local drs=" "
+
+	while read line; do
+		# Sanitize the line - see ldconfig(8) for delimiters
+		# Note: bash read turns tabs into spaces and read already
+		# delimits on newlines with the default $IFS
+		line=${line%%#*}   # Remove comments
+		line=${line//:/ }  # Change colon delimiter to space
+		line=${line//,/ }  # Change comma delimiter to space
+
+		next=0
+		for l in ${line}; do
+			if [[ ${next} == 1 ]]; then
+				next=0
+				drs=$(expand ${l} ${drs})
+			elif [[ ${l} == "include" ]]; then
+				next=1
+			else
+				# glibc's ldconfig silently skips non directories
+				if [[ -d ${l} ]]; then
+					repeated ${l} ${drs} && continue
+					drs+=" ${l} "
+				fi
+			fi
+		done
+	done < ${1}
+
+	echo ${drs}
+}
+
+sanitize() {
+	local drs=$@
+
+	repeated "${EPREFIX}/lib" ${drs} || drs="${EPREFIX}/lib ${drs}"
+	repeated "${EPREFIX}/usr/lib" ${drs} || drs="${EPREFIX}/usr/lib ${drs}"
+
+	echo ${drs}
+}
+
+changed() {
+	[[ -f ${ETC_LDSO_PATH} ]] || return 0
+	local current=$(<${ETC_LDSO_PATH})
+	current=${current//$'\n'/ }
+	[[ ${current} != ${drs} ]] || return 1
+}
+
+get_options "$@"
+
+if [[ ! -e ${LDSO_CONF} ]]; then
+        echo "${LDSO_CONF} not found" >&2
+        exit 1
+fi
+
+LDSO_CONF_DIR=$(dirname ${LDSO_CONF})
+
+drs=$(read_ldso_conf "${LDSO_CONF}")
+drs=$(sanitize ${drs})
+
+ARCH=@@ARCH@@
+LDSO_PATH="${ROOT}${EPREFIX}/lib/ld-musl-${ARCH}.so.1"
+if [[ ! -e ${LDSO_PATH} ]]; then
+	echo "${LDSO_PATH} not found" >&2
+	exit 1
+fi
+
+LDSO_ARCH=$(basename ${LDSO_PATH})
+LDSO_NAME=${LDSO_ARCH%.so.1}
+ETC_LDSO_PATH="${ROOT}${EPREFIX}/etc/${LDSO_NAME}.path"
+
+changed || exit 0
+X=$(mktemp -p /tmp ${LDSO_NAME}.XXXXXX)
+for d in ${drs}; do
+	echo ${d} >> ${X}
+done
+chmod 644 ${X}
+# busybox doesn't support mz -Z
+cp ${X} ${ETC_LDSO_PATH}
+rm ${X}