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68f87a7fe8
This is for simple cases where you just need to run a command immediately rather than pass a wrapper to a build tool. Signed-off-by: James Le Cuirot <chewi@gentoo.org>
121 lines
4.3 KiB
Bash
121 lines
4.3 KiB
Bash
# Copyright 2025 Gentoo Authors
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# Distributed under the terms of the GNU General Public License v2
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# @ECLASS: sysroot.eclass
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# @MAINTAINER:
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# cross@gentoo.org
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# @AUTHOR:
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# James Le Cuirot <chewi@gentoo.org>
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# @SUPPORTED_EAPIS: 7 8
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# @BLURB: Common functions for using a different (sys)root
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# @DESCRIPTION:
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# This eclass provides common functions to run executables within a different
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# root or sysroot, with or without emulation by QEMU. Despite the name, these
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# functions can be used in src_* or pkg_* phase functions.
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case ${EAPI} in
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7|8) ;;
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*) die "${ECLASS}: EAPI ${EAPI:-0} not supported" ;;
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esac
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# @FUNCTION: qemu_arch
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# @DESCRIPTION:
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# Return the QEMU architecture name for the given target or CHOST. This name is
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# used in qemu-user binary filenames, e.g. qemu-ppc64le.
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qemu_arch() {
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local target=${1:-${CHOST}}
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case ${target} in
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armeb*) echo armeb ;;
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arm*) echo arm ;;
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hppa*) echo hppa ;;
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i?86*) echo i386 ;;
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m68*) echo m68k ;;
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mips64el*-gnuabi64) echo mips64el ;;
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mips64el*-gnuabin32) echo mipsn32el ;;
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mips64*-gnuabi64) echo mips64 ;;
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mips64*-gnuabin32) echo mipsn32 ;;
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powerpc64le*) echo ppc64le ;;
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powerpc64*) echo ppc64 ;;
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powerpc*) echo ppc ;;
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*) echo "${target%%-*}" ;;
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esac
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}
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# @FUNCTION: sysroot_make_run_prefixed
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# @DESCRIPTION:
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# Create a wrapper script for directly running executables within a (sys)root
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# without changing the root directory. The path to that script is returned. If
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# no sysroot has been set, then this function returns unsuccessfully.
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#
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# The script explicitly uses QEMU if this is necessary and it is available in
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# this environment. It may otherwise implicitly use a QEMU outside this
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# environment if binfmt_misc has been used with the F flag. It is not feasible
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# to add a conditional dependency on QEMU.
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sysroot_make_run_prefixed() {
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local QEMU_ARCH=$(qemu_arch) SCRIPT MYROOT MYEROOT LIBGCC
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if [[ ${EBUILD_PHASE_FUNC} == src_* ]]; then
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[[ -z ${SYSROOT} ]] && return 1
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SCRIPT="${T}"/sysroot-run-prefixed
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MYROOT=${SYSROOT}
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MYEROOT=${ESYSROOT}
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# Both methods below might need help to find GCC's libs. GCC might not
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# be installed in the SYSROOT. Note that Clang supports this flag too.
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LIBGCC=$($(tc-getCC) ${CPPFLAGS} ${CFLAGS} ${LDFLAGS} -print-libgcc-file-name)
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LIBGCC=${LIBGCC%/*}
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else
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[[ -z ${ROOT} ]] && return 1
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SCRIPT="${T}"/root-run-prefixed
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MYROOT=${ROOT}
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MYEROOT=${EROOT}
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# Both methods below might need help to find GCC's libs. libc++ systems
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# won't have this file, but it's not needed in that case.
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if [[ -f ${EROOT}/etc/ld.so.conf.d/05gcc-${CHOST}.conf ]]; then
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local LIBGCC_A
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mapfile -t LIBGCC_A < "${EROOT}/etc/ld.so.conf.d/05gcc-${CHOST}.conf"
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LIBGCC=$(printf "%s:" "${LIBGCC_A[@]/#/${ROOT}}")
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LIBGCC=${LIBGCC%:}
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fi
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fi
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if [[ ${QEMU_ARCH} == $(qemu_arch "${CBUILD}") ]]; then
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# glibc: ld.so is a symlink, ldd is a binary.
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# musl: ld.so doesn't exist, ldd is a symlink.
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local DLINKER=$(find "${MYEROOT}"/usr/bin/{ld.so,ldd} -type l -print -quit 2>/dev/null || die "failed to find dynamic linker")
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# musl symlinks ldd to ld-musl.so to libc.so. We want the ld-musl.so
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# path, not the libc.so path, so don't resolve the symlinks entirely.
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DLINKER=$(readlink -ev "${DLINKER}" || die "failed to find dynamic linker")
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# Using LD_LIBRARY_PATH to set the prefix is not perfect, as it doesn't
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# adjust RUNPATHs, but it is probably good enough.
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install -m0755 /dev/stdin "${SCRIPT}" <<-EOF || die
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#!/bin/sh
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LD_LIBRARY_PATH="\${LD_LIBRARY_PATH}\${LD_LIBRARY_PATH+:}${LIBGCC}:${MYEROOT}/$(get_libdir):${MYEROOT}/usr/$(get_libdir)" exec "${DLINKER}" "\${@}"
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EOF
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else
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# Use QEMU's environment variables rather than its command line
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# arguments to cover both explicit and implicit QEMU usage.
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install -m0755 /dev/stdin "${SCRIPT}" <<-EOF || die
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#!/bin/sh
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QEMU_SET_ENV="\${QEMU_SET_ENV}\${QEMU_SET_ENV+,}LD_LIBRARY_PATH=\${LD_LIBRARY_PATH}\${LD_LIBRARY_PATH+:}${LIBGCC}" QEMU_LD_PREFIX="${MYROOT}" exec $(type -P "qemu-${QEMU_ARCH}") "\${@}"
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EOF
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fi
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echo "${SCRIPT}"
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}
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# @FUNCTION: sysroot_run_prefixed
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# @DESCRIPTION:
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# Create a wrapper script with sysroot_make_run_prefixed if necessary, and use
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# it to execute the given command, otherwise just execute the command directly.
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sysroot_run_prefixed() {
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local script
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if script=$(sysroot_make_run_prefixed); then
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"${script}" "${@}"
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else
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"${@}"
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fi
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}
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