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>

3 files changed, 336 insertions, 24 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}
diff --git a/sys-libs/musl/musl-1.2.2-r8.ebuild b/sys-libs/musl/musl-1.2.2-r8.ebuild
new file mode 100644
index 000000000000..52960e95a004
--- /dev/null
+++ b/sys-libs/musl/musl-1.2.2-r8.ebuild
@@ -0,0 +1,156 @@
+# Copyright 1999-2022 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+inherit eapi8-dosym flag-o-matic toolchain-funcs prefix
+if [[ ${PV} == "9999" ]] ; then
+	EGIT_REPO_URI="git://git.musl-libc.org/musl"
+	inherit git-r3
+else
+	SRC_URI="http://www.musl-libc.org/releases/${P}.tar.gz"
+	KEYWORDS="-* ~amd64 ~arm ~arm64 ~mips ~ppc ~ppc64 ~x86"
+fi
+GETENT_COMMIT="93a08815f8598db442d8b766b463d0150ed8e2ab"
+GETENT_FILE="musl-getent-${GETENT_COMMIT}.c"
+SRC_URI+="
+	https://dev.gentoo.org/~blueness/musl-misc/getconf.c
+	https://gitlab.alpinelinux.org/alpine/aports/-/raw/${GETENT_COMMIT}/main/musl/getent.c -> ${GETENT_FILE}
+	https://dev.gentoo.org/~blueness/musl-misc/iconv.c
+"
+
+export CBUILD=${CBUILD:-${CHOST}}
+export CTARGET=${CTARGET:-${CHOST}}
+if [[ ${CTARGET} == ${CHOST} ]] ; then
+	if [[ ${CATEGORY} == cross-* ]] ; then
+		export CTARGET=${CATEGORY#cross-}
+	fi
+fi
+
+DESCRIPTION="Light, fast and simple C library focused on standards-conformance and safety"
+HOMEPAGE="https://musl.libc.org"
+LICENSE="MIT LGPL-2 GPL-2"
+SLOT="0"
+IUSE="headers-only"
+
+QA_SONAME="/usr/lib/libc.so"
+QA_DT_NEEDED="/usr/lib/libc.so"
+
+is_crosscompile() {
+	[[ ${CHOST} != ${CTARGET} ]]
+}
+
+just_headers() {
+	use headers-only && is_crosscompile
+}
+
+pkg_setup() {
+	if [ ${CTARGET} == ${CHOST} ] ; then
+		case ${CHOST} in
+		*-musl*) ;;
+		*) die "Use sys-devel/crossdev to build a musl toolchain" ;;
+		esac
+	fi
+
+	# fix for #667126, copied from glibc ebuild
+	# make sure host make.conf doesn't pollute us
+	if is_crosscompile || tc-is-cross-compiler ; then
+		CHOST=${CTARGET} strip-unsupported-flags
+	fi
+}
+
+src_unpack() {
+	if [[ ${PV} == 9999 ]]; then
+		git-r3_src_unpack
+	else
+		unpack "${P}.tar.gz"
+	fi
+	mkdir misc || die
+	cp "${DISTDIR}"/getconf.c misc/getconf.c || die
+	cp "${DISTDIR}/${GETENT_FILE}" misc/getent.c || die
+	cp "${DISTDIR}"/iconv.c misc/iconv.c || die
+}
+
+src_configure() {
+	tc-getCC ${CTARGET}
+	just_headers && export CC=true
+
+	local sysroot
+	is_crosscompile && sysroot=/usr/${CTARGET}
+	./configure \
+		--target=${CTARGET} \
+		--prefix=${EPREFIX}${sysroot}/usr \
+		--syslibdir=${EPREFIX}${sysroot}/lib \
+		--disable-gcc-wrapper || die
+}
+
+src_compile() {
+	emake obj/include/bits/alltypes.h
+	just_headers && return 0
+
+	emake
+	if [[ ${CATEGORY} != cross-* ]] ; then
+		emake -C "${T}" getconf getent iconv \
+			CC="$(tc-getCC)" \
+			CFLAGS="${CFLAGS}" \
+			CPPFLAGS="${CPPFLAGS}" \
+			LDFLAGS="${LDFLAGS}" \
+			VPATH="${WORKDIR}/misc"
+	fi
+
+	$(tc-getCC) ${CFLAGS} -c -o libssp_nonshared.o  "${FILESDIR}"/stack_chk_fail_local.c || die
+	$(tc-getAR) -rcs libssp_nonshared.a libssp_nonshared.o || die
+}
+
+src_install() {
+	local target="install"
+	just_headers && target="install-headers"
+	emake DESTDIR="${D}" ${target}
+	just_headers && return 0
+
+	# musl provides ldd via a sym link to its ld.so
+	local sysroot
+	is_crosscompile && sysroot=/usr/${CTARGET}
+	local ldso=$(basename "${ED}"${sysroot}/lib/ld-musl-*)
+	dosym ${EPREFIX}${sysroot}/lib/${ldso} ${sysroot}/usr/bin/ldd
+
+	if [[ ${CATEGORY} != cross-* ]] ; then
+		# Fish out of config:
+		#   ARCH = ...
+		#   SUBARCH = ...
+		# and print $(ARCH)$(SUBARCH).
+		local arch=$(awk '{ k[$1] = $3 } END { printf("%s%s", k["ARCH"], k["SUBARCH"]); }' config.mak)
+
+		# The musl build system seems to create a symlink:
+		# ${D}/lib/ld-musl-${arch}.so.1 -> /usr/lib/libc.so.1 (absolute)
+		# During cross or within prefix, there's no guarantee that the host is
+		# using musl so that file may not exist. Use a relative symlink within
+		# ${D} instead.
+		rm -f "${ED}"/lib/ld-musl-${arch}.so.1 || die
+		dosym8 -r /usr/lib/libc.so /lib/ld-musl-${arch}.so.1
+
+		# If it's still a dead symlnk, OK, we really do need to abort.
+		[[ -e "${ED}"/lib/ld-musl-${arch}.so.1 ]] || die
+
+		cp "${FILESDIR}"/ldconfig.in-r3 "${T}"/ldconfig.in || die
+		sed -e "s|@@ARCH@@|${arch}|" "${T}"/ldconfig.in > "${T}"/ldconfig || die
+		eprefixify "${T}"/ldconfig
+		into /
+		dosbin "${T}"/ldconfig
+		into /usr
+		dobin "${T}"/getconf
+		dobin "${T}"/getent
+		dobin "${T}"/iconv
+		echo 'LDPATH="include ld.so.conf.d/*.conf"' > "${T}"/00musl || die
+		doenvd "${T}"/00musl
+		dolib.a libssp_nonshared.a
+	fi
+}
+
+pkg_postinst() {
+	is_crosscompile && return 0
+
+	[ "${ROOT}" != "/" ] && return 0
+
+	ldconfig || die
+}
diff --git a/sys-libs/musl/musl-9999.ebuild b/sys-libs/musl/musl-9999.ebuild
index 6a5e2688dd5a..52960e95a004 100644
--- a/sys-libs/musl/musl-9999.ebuild
+++ b/sys-libs/musl/musl-9999.ebuild
@@ -1,9 +1,9 @@
-# Copyright 1999-2021 Gentoo Authors
+# Copyright 1999-2022 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=7
 
-inherit eapi8-dosym flag-o-matic toolchain-funcs
+inherit eapi8-dosym flag-o-matic toolchain-funcs prefix
 if [[ ${PV} == "9999" ]] ; then
 	EGIT_REPO_URI="git://git.musl-libc.org/musl"
 	inherit git-r3
@@ -76,11 +76,11 @@ src_configure() {
 	just_headers && export CC=true
 
 	local sysroot
-	is_crosscompile && sysroot="${EPREFIX}"/usr/${CTARGET}
+	is_crosscompile && sysroot=/usr/${CTARGET}
 	./configure \
 		--target=${CTARGET} \
-		--prefix=${sysroot}/usr \
-		--syslibdir=${sysroot}/lib \
+		--prefix=${EPREFIX}${sysroot}/usr \
+		--syslibdir=${EPREFIX}${sysroot}/lib \
 		--disable-gcc-wrapper || die
 }
 
@@ -111,8 +111,8 @@ src_install() {
 	# musl provides ldd via a sym link to its ld.so
 	local sysroot
 	is_crosscompile && sysroot=/usr/${CTARGET}
-	local ldso=$(basename "${D}"${sysroot}/lib/ld-musl-*)
-	dosym ${sysroot}/lib/${ldso} ${sysroot}/usr/bin/ldd
+	local ldso=$(basename "${ED}"${sysroot}/lib/ld-musl-*)
+	dosym ${EPREFIX}${sysroot}/lib/${ldso} ${sysroot}/usr/bin/ldd
 
 	if [[ ${CATEGORY} != cross-* ]] ; then
 		# Fish out of config:
@@ -121,24 +121,20 @@ src_install() {
 		# and print $(ARCH)$(SUBARCH).
 		local arch=$(awk '{ k[$1] = $3 } END { printf("%s%s", k["ARCH"], k["SUBARCH"]); }' config.mak)
 
-		if [[ ! -e "${ED}"/lib/ld-musl-${arch}.so.1 ]] ; then
-			# During cross (using crossdev), when emerging sys-libs/musl,
-			# if /usr/lib/libc.so.1 doesn't exist on the system, installation
-			# would fail.
-			#
-			# The musl build system seems to create a symlink:
-			# ${D}/lib/ld-musl-${arch}.so.1 -> /usr/lib/libc.so.1 (absolute)
-			# During cross, there's no guarantee that the host is using musl
-			# so that file may not exist. Use a relative symlink within ${D}
-			# instead.
-			dosym8 -r /usr/lib/libc.so /lib/ld-musl-${arch}.so.1
-
-			# If it's still a dead symlnk, OK, we really do need to abort.
-			[[ -e "${ED}"/lib/ld-musl-${arch}.so.1 ]] || die
-		fi
-
-		cp "${FILESDIR}"/ldconfig.in-r1 "${T}"/ldconfig.in || die
+		# The musl build system seems to create a symlink:
+		# ${D}/lib/ld-musl-${arch}.so.1 -> /usr/lib/libc.so.1 (absolute)
+		# During cross or within prefix, there's no guarantee that the host is
+		# using musl so that file may not exist. Use a relative symlink within
+		# ${D} instead.
+		rm -f "${ED}"/lib/ld-musl-${arch}.so.1 || die
+		dosym8 -r /usr/lib/libc.so /lib/ld-musl-${arch}.so.1
+
+		# If it's still a dead symlnk, OK, we really do need to abort.
+		[[ -e "${ED}"/lib/ld-musl-${arch}.so.1 ]] || die
+
+		cp "${FILESDIR}"/ldconfig.in-r3 "${T}"/ldconfig.in || die
 		sed -e "s|@@ARCH@@|${arch}|" "${T}"/ldconfig.in > "${T}"/ldconfig || die
+		eprefixify "${T}"/ldconfig
 		into /
 		dosbin "${T}"/ldconfig
 		into /usr