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gts-annobin-plugin-select.sh
#!/usr/bin/sh # This is a script to switch the symlinks in a GTS gcc's plugin # directory so that they select either the GTS-annobin provided # plugin or the GTS-gcc provided plugin. # Author: Nick Clifton <nickc@redhat.com> # Copyright (c) 2021-2022 Red Hat. # # This is free software; you can redistribute it and/or modify it # under the terms of the GNU General Public License as published # by the Free Software Foundation; either version 2, or (at your # option) any later version. # It is distributed in the hope that it will be useful, but # WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # Usage: # gts-annobin-plugin-select scl_root # # Set this variable to non-zero to enable the generation of debugging # messages. debug=0 if test "x$1" = "x" ; then if [ $debug -eq 1 ] then echo " gts-annobin-plugin-select: Must provide a root directory" fi exit 1 else scl_root=$1 fi # This script is similar to the redhat-annobin-plugin-select.sh script which # is part of the redhat-rpm-config package. That scripts decides between two # versions of the annobin plugin for the system compiler and stores it choice # in a symlink in the /usr/lib/rpm/redhat directory. The choice eventually # resolves into the system gcc attempting to load either a plugin called # annobin.so or a plugin called gcc-annobin.so. # In a GTS environment the choice made by redhat-annobin-plugin-select.sh # might not be appropriate (or even possible). The choice cannot be changed # because the system compilation environment must remain instact. So instead # the GTS versions of gcc and annobin install plugins called gts-annobin.so # and gts-gcc-annobin.so (into the GTS gcc's plugin directory) and this script # creates a pair of symlinks called annobin.so and gcc-annobin.so. In this # way the decision made by redhat-annobin-plugin-select.sh is overridden # without affecting any system files. # We cannot be sure that this script will run inside a GTS enabled shell, # so we have to use absolute paths. gts_gcc=$scl_root/usr/bin/gcc if [ ! -x $gts_gcc ] then if [ $debug -eq 1 ] then echo " gts-annobin-plugin-select: Could not find gcc. Expected: $gts_gcc" fi exit 0 fi # This is where the annobin package stores the information on the version # of gcc that built the annobin plugin. aver=`$gts_gcc --print-file-name=plugin`/annobin-plugin-version-info # This is where the gcc package stores its version information. gver=`$gts_gcc --print-file-name=rpmver` aplugin=`$gts_gcc --print-file-name=plugin`/gts-annobin.so.0.0.0 gplugin=`$gts_gcc --print-file-name=plugin`/gts-gcc-annobin.so.0.0.0 install_annobin_version=0 install_gcc_version=0 if [ -f $aplugin ] then if [ -f $gplugin ] then if [ $debug -eq 1 ] then echo " gts-annobin-plugin-select: Both plugins exist, checking version information" fi if [ -f $gver ] then if [ -f $aver ] then if [ $debug -eq 1 ] then echo " gts-annobin-plugin-select: Both plugin version files exist - comparing..." fi # Get the first line from the version info files. This is just in # case there are extra lines in the files. avers=`head --lines=1 $aver` gvers=`head --lines=1 $gver` if [ $debug -eq 1 ] then echo " gts-annobin-plugin-select: Annobin plugin built by gcc $avers" echo " gts-annobin-plugin-select: GCC plugin built by gcc $gvers" fi # If both plugins were built by the same version of gcc then select # the one from the annobin package (in case it is built from newer # sources). If the plugin builder versions differ, select the gcc # built version instead. This assumes that the gcc built version # always matches the installed gcc, which should be true. if [ $avers = $gvers ] then if [ $debug -eq 1 ] then echo " gts-annobin-plugin-select: Both plugins built by the same compiler - using annobin-built plugin" fi install_annobin_version=1 else if [ $debug -eq 1 ] then echo " gts-annobin-plugin-select: Versions differ - using gcc-built plugin" fi install_gcc_version=1 fi else if [ $debug -eq 1 ] then echo " gts-annobin-plugin-select: Annobin version file does not exist, using gcc-built plugin" fi install_gcc_version=1 fi else if [ -f $aver ] then # FIXME: This is suspicious. If the installed GCC does not supports plugins # then enabling the annobin plugin will not work. if [ $debug -eq 1 ] then echo " gts-annobin-plugin-select: GCC plugin version file does not exist, using annobin-built plugin" fi install_annobin_version=1 else if [ $debug -eq 1 ] then echo " gts-annobin-plugin-select: Neither version file exists - playing safe and using gcc-built plugin" echo " gts-annobin-plugin-select: Note: expected to find $aver and/or $gver" fi install_gcc_version=1 fi fi else if [ $debug -eq 1 ] then echo " gts-annobin-plugin-select: Only the annobin plugin exists - using that" fi install_annobin_version=1 fi else if [ -f $gplugin ] then if [ $debug -eq 1 ] then echo " gts-annobin-plugin-select: Only the gcc plugin exists - using that" fi install_gcc_version=1 else aplugin=`$gts_gcc --print-file-name=plugin`/annobin.so.0.0.0 if [ -f $aplugin ] then if [ $debug -eq 1 ] then echo " gts-annobin-plugin-select: Original annobin plugin exists - renaming" echo " gts-annobin-plugin-select: Using renamed original annobin plugin" fi pushd `$gts_gcc --print-file-name=plugin` > /dev/null mv annobin.so.0.0.0 gts-annobin.so.0.0.0 popd > /dev/null install_annobin_version=1 else if [ $debug -eq 1 ] then echo " gts-annobin-plugin-select: Neither plugin exists - playing safe and not changing anything" echo " gts-annobin-plugin-select: Note: expected to find $aplugin and/or $gplugin" fi fi fi fi if [ $install_annobin_version -eq 1 ] then if [ $debug -eq 1 ] then echo " gts-annobin-plugin-select: Setting symlinks for the annobin version of the plugin" fi pushd `$gts_gcc --print-file-name=plugin` > /dev/null rm -f gcc-annobin.so.0.0.0 annobin.so.0.0.0 gcc-annobin.so annobin.so ln -s gts-annobin.so.0.0.0 annobin.so ln -s gts-annobin.so.0.0.0 gcc-annobin.so ln -s gts-annobin.so.0.0.0 annobin.so.0.0.0 ln -s gts-annobin.so.0.0.0 gcc-annobin.so.0.0.0 popd > /dev/null else if [ $install_gcc_version -eq 1 ] then if [ $debug -eq 1 ] then echo " gts-annobin-plugin-select: Setting symlinks for the gcc version of the plugin" fi pushd `$gts_gcc --print-file-name=plugin` > /dev/null rm -f gcc-annobin.so.0.0.0 annobin.so.0.0.0 gcc-annobin.so annobin.so ln -s gts-gcc-annobin.so.0.0.0 annobin.so ln -s gts-gcc-annobin.so.0.0.0 gcc-annobin.so ln -s gts-gcc-annobin.so.0.0.0 annobin.so.0.0.0 ln -s gts-gcc-annobin.so.0.0.0 gcc-annobin.so.0.0.0 popd > /dev/null else if [ $debug -eq 1 ] then echo " gts-annobin-plugin-select: NOT CHANGING SYMLINKS" fi fi fi