From 72f3c8b13019b8882f4536411e42734fd3b4a4d7 Mon Sep 17 00:00:00 2001 From: Damian Szuberski Date: Thu, 17 Feb 2022 00:17:16 +0100 Subject: [PATCH] Fix Linux kernel directories detection Most modern Linux distributions have separate locations for bare source and prebuilt ("build") files. Additionally, there are `source` and `build` symlinks in `/lib/modules/$(KERNEL_VERSION)` pointing to them. The order of directory search is now: - `configure` command line values if both `--with-linux` and `--with-linux-obj` were defined - If only `--with-linux` was defined, `--with-linux-obj` is assumed to have the same value as `--with-linux` - If neither `--with-linux` nor `--with-linux-obj` were defined autodetection is used: - `/lib/modules/$(uname -r)/{source,build}` respectively, if exist - The first directory in `/lib/modules` with the highest version number according to `sort -V` which contains `source` and `build` symlinks/directories - The first directory matching `/usr/src/kernels/*` and `/usr/src/linux-*` with the highest version number according to `sort -V`. Here the source and prebuilt directories are assumed to be the same. Reviewed-by: Brian Behlendorf Signed-off-by: szubersk Closes #9935 Closes #13096 --- config/kernel.m4 | 105 +++++++++++++++++++++++++++++++++-------------- 1 file changed, 75 insertions(+), 30 deletions(-) diff --git a/config/kernel.m4 b/config/kernel.m4 index b918f04534..3122e9dbaa 100644 --- a/config/kernel.m4 +++ b/config/kernel.m4 @@ -280,6 +280,35 @@ AC_DEFUN([ZFS_AC_MODULE_SYMVERS], [ dnl # dnl # Detect the kernel to be built against dnl # +dnl # Most modern Linux distributions have separate locations for bare +dnl # source (source) and prebuilt (build) files. Additionally, there are +dnl # `source` and `build` symlinks in `/lib/modules/$(KERNEL_VERSION)` +dnl # pointing to them. The directory search order is now: +dnl # +dnl # - `configure` command line values if both `--with-linux` and +dnl # `--with-linux-obj` were defined +dnl # +dnl # - If only `--with-linux` was defined, `--with-linux-obj` is assumed +dnl # to have the same value as `--with-linux` +dnl # +dnl # - If neither `--with-linux` nor `--with-linux-obj` were defined +dnl # autodetection is used: +dnl # +dnl # - `/lib/modules/$(uname -r)/{source,build}` respectively, if exist. +dnl # +dnl # - If only `/lib/modules/$(uname -r)/build` exists, it is assumed +dnl # to be both source and build directory. +dnl # +dnl # - The first directory in `/lib/modules` with the highest version +dnl # number according to `sort -V` which contains both `source` and +dnl # `build` symlinks/directories. If module directory contains only +dnl # `build` component, it is assumed to be both source and build +dnl # directory. +dnl # +dnl # - Last resort: the first directory matching `/usr/src/kernels/*` +dnl # and `/usr/src/linux-*` with the highest version number according +dnl # to `sort -V` is assumed to be both source and build directory. +dnl # AC_DEFUN([ZFS_AC_KERNEL], [ AC_ARG_WITH([linux], AS_HELP_STRING([--with-linux=PATH], @@ -291,25 +320,52 @@ AC_DEFUN([ZFS_AC_KERNEL], [ [Path to kernel build objects]), [kernelbuild="$withval"]) - AC_MSG_CHECKING([kernel source directory]) - AS_IF([test -z "$kernelsrc"], [ - AS_IF([test -e "/lib/modules/$(uname -r)/source"], [ - headersdir="/lib/modules/$(uname -r)/source" - sourcelink=$(readlink -f "$headersdir") + AC_MSG_CHECKING([kernel source and build directories]) + AS_IF([test -n "$kernelsrc" && test -z "$kernelbuild"], [ + kernelbuild="$kernelsrc" + ], [test -z "$kernelsrc"], [ + AS_IF([test -e "/lib/modules/$(uname -r)/source" && \ + test -e "/lib/modules/$(uname -r)/build"], [ + src="/lib/modules/$(uname -r)/source" + build="/lib/modules/$(uname -r)/build" ], [test -e "/lib/modules/$(uname -r)/build"], [ - headersdir="/lib/modules/$(uname -r)/build" - sourcelink=$(readlink -f "$headersdir") + build="/lib/modules/$(uname -r)/build" + src="$build" ], [ - sourcelink=$(ls -1d /usr/src/kernels/* \ - /usr/src/linux-* \ - 2>/dev/null | grep -v obj | tail -1) + src= + + for d in $(ls -1d /lib/modules/* 2>/dev/null | sort -Vr); do + if test -e "$d/source" && test -e "$d/build"; then + src="$d/source" + build="$d/build" + break + fi + + if test -e "$d/build"; then + src="$d/build" + build="$d/build" + break + fi + done + + # the least reliable method + if test -z "$src"; then + src=$(ls -1d /usr/src/kernels/* /usr/src/linux-* \ + 2>/dev/null | grep -v obj | sort -Vr | head -1) + build="$src" + fi ]) - AS_IF([test -n "$sourcelink" && test -e ${sourcelink}], [ - kernelsrc=`readlink -f ${sourcelink}` + AS_IF([test -n "$src" && test -e "$src"], [ + kernelsrc=$(readlink -e "$src") ], [ kernelsrc="[Not found]" ]) + AS_IF([test -n "$build" && test -e "$build"], [ + kernelbuild=$(readlink -e "$build") + ], [ + kernelbuild="[Not found]" + ]) ], [ AS_IF([test "$kernelsrc" = "NONE"], [ kernsrcver=NONE @@ -317,30 +373,19 @@ AC_DEFUN([ZFS_AC_KERNEL], [ withlinux=yes ]) + AC_MSG_RESULT([done]) + AC_MSG_CHECKING([kernel source directory]) AC_MSG_RESULT([$kernelsrc]) - AS_IF([test ! -d "$kernelsrc"], [ + AC_MSG_CHECKING([kernel build directory]) + AC_MSG_RESULT([$kernelbuild]) + AS_IF([test ! -d "$kernelsrc" || test ! -d "$kernelbuild"], [ AC_MSG_ERROR([ *** Please make sure the kernel devel package for your distribution *** is installed and then try again. If that fails, you can specify the - *** location of the kernel source with the '--with-linux=PATH' option.]) + *** location of the kernel source and build with the '--with-linux=PATH' and + *** '--with-linux-obj=PATH' options respectively.]) ]) - AC_MSG_CHECKING([kernel build directory]) - AS_IF([test -z "$kernelbuild"], [ - AS_IF([test x$withlinux != xyes -a -e "/lib/modules/$(uname -r)/build"], [ - kernelbuild=`readlink -f /lib/modules/$(uname -r)/build` - ], [test -d ${kernelsrc}-obj/${target_cpu}/${target_cpu}], [ - kernelbuild=${kernelsrc}-obj/${target_cpu}/${target_cpu} - ], [test -d ${kernelsrc}-obj/${target_cpu}/default], [ - kernelbuild=${kernelsrc}-obj/${target_cpu}/default - ], [test -d `dirname ${kernelsrc}`/build-${target_cpu}], [ - kernelbuild=`dirname ${kernelsrc}`/build-${target_cpu} - ], [ - kernelbuild=${kernelsrc} - ]) - ]) - AC_MSG_RESULT([$kernelbuild]) - AC_MSG_CHECKING([kernel source version]) utsrelease1=$kernelbuild/include/linux/version.h utsrelease2=$kernelbuild/include/linux/utsrelease.h