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#! /bin/bash
##############################################################################
# How it works:
# * Kernels install modules below /lib/modules/$krel/kernel/.
# * KMPs install modules below /lib/modules/$krel/updates/ or .../extra/.
# * Symbolic links to modules of compatible KMPs are created under
# /lib/modules/$krel/weak-updates/{updates,extra}/... (the original path
# below /lib/modules/$other_krel is used).
# * Depmod searches the directories in this order: updates/, extra/,
# weak-updates/, kernel/ (see /etd/depmod.conf or
# /etc/depmod.d/00-system.conf for details).
# * Compatibility of a kernel with a KMP is defined as: The KMP is built
# for the same flavor as the kernel and after adding the KMP modules to
# the kernel, depmod -e -E Module.symvers reports no errors about
# missing symbols or different symbol checksums. See the
# has_unresolved_symbols() function for details.
#
# * At KMP install time (function add_kmp()), we create symbolic links
# for all kernels that this KMP is compatible with. We skip kernels that
# already contain symbolic links to a newer KMP of the same name,
# contain the KMP itself or another version in updates/ or extra/ or
# have overlapping module names with other KMPs in the respective
# kernel (this should not happen).
# * At kernel install time (functions add_kernel()), we create symbolic
# links for each compatible KMP, unless the KMP or a different one with
# overlapping module names is present in updates/ or extra/ (KMP build
# against $krel can be installed before a kernel with that version).
# When multiple KMPs of the same name are compatbile, we chose the one
# with the highest version number. This is repeated when subsequent
# subpackages (main or -extra) of that kernel are installed.
# * At KMP removal time (function remove_kmp()), the modules and their
# symlinks are removed and, where possible, replaced by symlinks to the
# newest of the remaining compatible version of that KMP.
# * [NOT IMPLEMENTED] When a kernel subpackage is removed, symlinks to
# KMPs that become incompatible are removed as well. This is not
# implemented, because removing the main subpackage and only keeping
# the -base package AND having KMPs installed is not an expected
# scenario, and implementing this would only slow down kernel updates.
# * When the kernel is removed (function remove_kernel()), it's
# weak-updates directory is also removed.
#
# naming conventions used in this script:
# $kmp: name-version-release of a kmp, e.g kqemu-kmp-default-1.3.0pre11_2.6.25.16_0.1-7.1
# $kmpshort: name of a kmp, e.g kqemu-kmp-default
# $basename: portion of $kmp up to the "-kmp-" part, e.g kqemu
# $flavor: flavor of a kmp or kernel, e.g default
# $krel: kernel version, as in /lib/modules/$krel
# $module: full path to a module below updates/
# $symlink: full path to a module symlink below weak-updates/
#
# files in $tmpdir:
# krel-$kmp: kernel version for which $kmp was built
# modules-$kmp: list of modules in $kmp (full paths)
# basenames-$kmp: list of basenames of modules in $kmp
# kmps: list of kmps, newest first
#
log() {
[ -n "$opt_verbose" ] && echo "$@" >&2
}
doit() {
if [ -n "$doit" ]; then
# override
"$@"
return
fi
log "$@"
if [ -z "$opt_dry_run" ]; then
"$@"
else
:
fi
}
filter_basenames() {
sed -rn 's:.*\<lib/modules/.*/([^/]*\.ko)$:\1:p'
}
# Name of the symlink that makes a module available to a given kernel
symlink_to_module() {
local module=$1 krel=$2
echo /lib/modules/$krel/weak-updates/${module#/lib/modules/*/}
}
# Is a kmp already present in or linked to from this kernel?
kmp_is_present() {
local kmp=$1 krel=$2
if [ $krel = "$(cat $tmpdir/krel-$kmp)" ]; then
return 0
fi
local module symlink
while read module; do
symlink=$(symlink_to_module $module $krel)
[ $module -ef $symlink -o $module = "$(readlink $symlink)" ] || return 1
done < $tmpdir/modules-$kmp
return 0
}
# Add the modules of a kmp to /lib/modules/$krel
add_kmp_modules() {
local kmp=$1 krel=$2 basedir=$3
[ -n "$kmp" ] || return 0
local module symlink
while read module; do
symlink=$(symlink_to_module $module $krel)
doit mkdir -p ${opt_debug:+-v} $basedir${symlink%/*} || exit 1
doit ln -sf ${opt_debug:+-v} $module $basedir$symlink || exit 1
done < $tmpdir/modules-$kmp
}
# Remove the modules of a kmp from /lib/modules/$krel
remove_kmp_modules() {
local kmp=$1 krel=$2 basedir=$3
[ -n "$kmp" ] || return 0
local module symlink
while read module; do
symlink=$(symlink_to_module $module $krel)
doit rm -f ${opt_debug:+-v} $basedir$symlink
done < $tmpdir/modules-$kmp
}
# Create a temporary working copy of /lib/modules/$1
create_temporary_modules_dir() {
local modules_dir=/lib/modules/$1 basedir=$2
local opt_v=${opt_debug:+-v}
mkdir -p $opt_v $basedir$modules_dir/weak-updates
ln -s $opt_v $modules_dir/kernel $basedir$modules_dir/kernel
eval "$(find $modules_dir -path "$modules_dir/modules.*" -prune \
-o -path "$modules_dir/kernel" -prune \
-o -type d -printf "mkdir -p $opt_v $basedir%p\n" \
-o -printf "ln -s $opt_v %p $basedir%p\n"
)"
}
# Check for unresolved symbols
has_unresolved_symbols() {
local krel=$1 basedir=$2 output status args sym_errors
if [ ! -e $tmpdir/symvers-$krel -a -e /boot/symvers-$krel.gz ]; then
zcat /boot/symvers-$krel.gz > $tmpdir/symvers-$krel
fi
if [ -e $tmpdir/symvers-$krel ]; then
args=(-E $tmpdir/symvers-$krel)
else
echo "warning: $tmpdir/symvers-$krel not available" >&2
args=(-F /boot/System.map-$krel)
fi
output="$(/sbin/depmod -b "$basedir" -ae "${args[@]}" $krel 2>&1)"
status=$?
if [ $status -ne 0 ]; then
echo "$output" >&2
echo "depmod exited with error $status" >&2
return 0
fi
sym_errors=$(echo "$output" | \
grep -E ' (needs unknown|disagrees about version of) symbol ')
if [ -n "$sym_errors" ]; then
[ -z "$opt_debug" ] || echo "$sym_errors" >&2
return 0
fi
return 1
}
# KMPs can only be added if none of the module basenames overlap
basenames_are_unique() {
local kmp=$1 krel=$2 basedir=$3 dir
for dir in $basedir/lib/modules/$krel/{weak-updates,updates,extra}/; do
if [ ! -d "$dir" ]; then
continue
fi
if [ -n "$(comm -1 -2 $tmpdir/basenames-$kmp \
<(find "$dir" -not -type d -printf '%f\n' | sort -u))" ]; then
return 1
fi
done
return 0
}
# Can a kmp be replaced by a different version of the same kmp in a kernel?
# Set the old kmp to "" when no kmp is to be removed.
can_replace_kmp() {
local old_kmp=$1 new_kmp=$2 krel=$3
local basedir=$tmpdir/$krel
local weak_updates=/lib/modules/$krel/weak-updates/
[ -d "$basedir" ] || \
create_temporary_modules_dir "$krel" "$basedir"
# force doit() to execute the commands (in $tmpdir)
doit=1 remove_kmp_modules "$old_kmp" "$krel" "$basedir"
if ! basenames_are_unique "$new_kmp" "$krel" "$basedir"; then
doit=1 add_kmp_modules "$old_kmp" "$krel" "$basedir"
return 1
fi
doit=1 add_kmp_modules "$new_kmp" "$krel" "$basedir"
if has_unresolved_symbols "$krel" "$basedir"; then
doit=1 remove_kmp_modules "$new_kmp" "$krel" "$basedir"
doit=1 add_kmp_modules "$old_kmp" "$krel" "$basedir"
return 1
fi
return 0
}
# Figure out which modules a kmp contains
check_kmp() {
local kmp=$1
# Make sure all modules are for the same kernel
set -- $(sed -re 's:^/lib/modules/([^/]+)/.*:\1:' \
$tmpdir/modules-$kmp \
| sort -u)
if [ $# -ne 1 ]; then
echo "Error: package $kmp seems to contain modules for multiple" \
"kernel versions" >&2
return 1
fi
echo $1 > $tmpdir/krel-$kmp
# Make sure none of the modules are in kernel/ or weak-updates/
if grep -qE -e '^/lib/modules/[^/]+/(kernel|weak-updates)/' \
$tmpdir/modules-$kmp; then
echo "Error: package $kmp must not install modules into " \
"kernel/ or weak-updates/" >&2
return 1
fi
sed -e 's:.*/::' $tmpdir/modules-$kmp \
| sort -u > $tmpdir/basenames-$kmp
}
# Figure out which kmps there are, and which modules they contain
# set basename to '*' to find all kmps of a given flavor
find_kmps() {
local basename=$1 flavor=$2
local kmp
for kmp in $(rpm -qa --qf '%{n}-%{v}-%{r}\n' --nodigest --nosignature "$basename-kmp-$flavor"); do
rpm -ql --nodigest --nosignature "$kmp" \
| grep -Ee '^/lib/modules/[^/]+/.+\.ko$' \
> $tmpdir/modules-$kmp
if [ $? != 0 ]; then
echo "WARNING: $kmp does not contain any kernel modules" >&2
rm -f $tmpdir/modules-$kmp
continue
fi
check_kmp $kmp || return 1
done
printf "%s\n" $tmpdir/basenames-* \
| sed -re "s:$tmpdir/basenames-::" \
| /usr/lib/rpm/rpmsort -r \
> $tmpdir/kmps
}
previous_version_of_kmp() {
local new_kmp=$1 krel=$2
local module symlink old_kmp
while read module; do
symlink=$(symlink_to_module $module $krel)
[ -e "$symlink" ] || continue
[ -L "$symlink" ] || return
old_kmp=$(grep -l "$(readlink "$symlink")" $tmpdir/modules-* | sed 's:.*/modules-::' ) || return
# The package %NAME must be the same
[ "${old_kmp%-*-*}" == "${new_kmp%-*-*}" ] || return
# The other kmp must be older
while read kmp; do
[ "$kmp" == "$old_kmp" ] && return
[ "$kmp" == "$new_kmp" ] && break
done <$tmpdir/kmps
done < $tmpdir/modules-$new_kmp
echo "$old_kmp"
}
# write GZIP / XZ uncompressed file to stdout
uncomp() {
local file=$1
if gzip -cd "$file" 2>/dev/null; then
return
fi
xz -cd "$file"
}
# test if mkinitrd is needed for $krel.
# stdin - list of changed modules ("_kernel_" for the whole kernel)
needs_mkinitrd() {
local krel=$1
local changed_basenames=($(sort -u))
# Don't generate an initrd for kdump here. It's done automatically with mkdumprd when
# /etc/init.d/boot.kdump is called to load the kdump kernel. See mkdumprd(8) why
# it is done this way.
if [[ "$krel" == *kdump* ]] ; then
return 1
fi
if ! [ -f /etc/fstab -a ! -e /.buildenv -a -x /sbin/mkinitrd ] ; then
echo "Please run mkinitrd as soon as your system is complete." >&2
return 1
fi
# KMPs can force mkinitrd run with %kernel_module_package -b that sets
# this variable
if test -n "$KMP_NEEDS_MKINITRD" && \
! test "$KMP_NEEDS_MKINITRD" -eq 0 2>/dev/null; then
return 0
fi
if [ "$changed_basenames" = "_kernel_" ]; then
return 0
fi
if [ ! -e /boot/initrd-$krel ]; then
return 0
fi
local initrd_basenames=($( (lsinitrd /boot/initrd-$krel | filter_basenames; INITRD_MODULES=; . /etc/sysconfig/kernel &>/dev/null; printf '%s.ko\n' $INITRD_MODULES) | sort -u))
local i=($(join <(printf '%s\n' "${changed_basenames[@]}") \
<(printf '%s\n' "${initrd_basenames[@]}") ))
log "changed initrd modules for kernel $krel: ${i[@]-none}"
if [ ${#i[@]} -gt 0 ]; then
return 0
fi
return 1
}
# run depmod and mkinitrd for kernel version $krel
# stdin - list of changed modules ("_kernel_" for a whole kernel)
run_depmod_and_mkinitrd() {
local krel=$1
local status=0
if [ -d /lib/modules/$krel -a -f /boot/System.map-$krel ] ; then
doit /sbin/depmod -F /boot/System.map-$krel -ae $krel || return 1
fi
if needs_mkinitrd $krel; then
local image
for x in vmlinuz image vmlinux linux bzImage uImage Image zImage; do
if [ -f /boot/$x-$krel ]; then
image=$x
break
fi
done
if [ -n "$image" ]; then
if test -n "$INITRD_IN_POSTTRANS"; then
mkdir -p /var/run/regenerate-initrd
touch /var/run/regenerate-initrd/$image-$krel
else
doit /sbin/mkinitrd -k /boot/$image-$krel -i /boot/initrd-$krel
status=$?
# mkinitrd fails with status 10 if any required kernel modules
# missing. We expect those modules to be added later (by one of
# the other kernel-$flavor packages).
if [ $status -eq 10 ]; then
log "mkinitrd failed with status 10 (module missing), proceeding"
status=0
fi
fi
else
echo "WARNING: kernel image for $krel not found!" >&2
fi
fi
return $status
}
kernel_changed() {
local krel=$1 flavor=${1##*-}
if [ ! -f /boot/System.map-$krel ]; then
# this kernel does not exist anymore
return 0
fi
if [ ! -d /lib/modules/$krel ]; then
# a kernel without modules - run mkinitrd nevertheless (to mount the
# root fs, etc).
echo "_kernel_" | run_depmod_and_mkinitrd "$krel"
return
fi
find_kmps '*' $flavor || return 1
local kmps=( $(cat $tmpdir/kmps) )
while :; do
[ ${#kmps[@]} -gt 0 ] || break
local added='' skipped='' n kmp
for ((n=0; n<${#kmps[@]}; n++)); do
kmp=${kmps[n]}
[ -n "$kmp" ] || continue
if kmp_is_present $kmp $krel; then
log "Package $kmp does not need to be added to kernel $krel"
kmps[n]=''
continue
fi
local old_kmp=$(previous_version_of_kmp $kmp $krel)
if can_replace_kmp "$old_kmp" $kmp $krel; then
remove_kmp_modules "$old_kmp" "$krel"
add_kmp_modules "$kmp" "$krel"
if [ -z "$old_kmp" ]; then
log "Package $kmp added to kernel $krel"
else
log "Package $old_kmp replaced by package $kmp in kernel $krel"
fi
added=1
kmps[n]=''
continue
fi
skipped=1
done
[ -n "$added" -a -n "$skipped" ] || break
done
echo "_kernel_" | run_depmod_and_mkinitrd "$krel"
}
add_kernel() {
local krel=$1
kernel_changed $krel
}
remove_kernel() {
local krel=$1
local dir=/lib/modules/$krel
if [ -d $dir/weak-updates ]; then
rm -rf $dir/weak-updates
fi
# If there are no KMPs left, remove the empty directory
rmdir $dir 2>/dev/null
}
add_kernel_modules() {
local krel=$1
cat >/dev/null
kernel_changed $krel
}
remove_kernel_modules() {
local krel=$1
cat >/dev/null
# FIXME: remove KMP symlinks that no longer work
kernel_changed $krel
}
add_kmp() {
local kmp=$1 kmpshort=${1%-*-*}
local basename=${kmpshort%-kmp-*} flavor=${kmpshort##*-}
# Find the kmp to be added as well as any previous versions
find_kmps "$basename" "$flavor" || return 1
local dir krel status
for dir in /lib/modules/*; do
krel=${dir#/lib/modules/}
case "$krel" in
*-$flavor)
;;
*)
continue
esac
[ -d $dir -a -f /boot/System.map-$krel ] || continue
if opt_debug=1 has_unresolved_symbols "$krel" "/"; then
echo "Warning: /lib/modules/$krel is inconsistent" >&2
echo "Warning: weak-updates symlinks might not be created" >&2
fi
if kmp_is_present $kmp $krel; then
log "Package $kmp does not need to be added to kernel $krel"
run_depmod_and_mkinitrd "$krel" <$tmpdir/basenames-$kmp || \
status=1
continue
fi
local old_kmp=$(previous_version_of_kmp $kmp $krel)
if can_replace_kmp "$old_kmp" $kmp $krel; then
remove_kmp_modules "$old_kmp" "$krel"
add_kmp_modules "$kmp" "$krel"
if [ -z "$old_kmp" ]; then
log "Package $kmp added to kernel $krel"
run_depmod_and_mkinitrd "$krel" <$tmpdir/basenames-$kmp || \
status=1
else
log "Package $old_kmp replaced by package $kmp in kernel $krel"
cat $tmpdir/basenames-{$old_kmp,$kmp} \
| run_depmod_and_mkinitrd "$krel" || status=1
fi
fi
done
return $status
}
remove_kmp() {
local kmp=$1 kmpshort=${1%-*-*}
local basename=${kmpshort%-kmp-*} flavor=${kmpshort##*-}
# Find any previous versions of the same kmp
find_kmps "$basename" "$flavor" || return 1
# Read the list of module names from standard input
# (This kmp may already have been removed!)
cat > $tmpdir/modules-$kmp
check_kmp "$kmp" || return 1
local dir krel status
for dir in /lib/modules/*; do
krel=${dir#/lib/modules/}
case "$krel" in
*-$flavor)
;;
*)
continue
esac
[ -d $dir -a -f /boot/System.map-$krel ] || continue
if opt_debug=1 has_unresolved_symbols "$krel" "/"; then
echo "Warning: /lib/modules/$krel is inconsistent" >&2
echo "Warning: weak-updates symlinks might not be created" >&2
fi
if kmp_is_present $kmp $krel; then
if [ $krel != "$(cat $tmpdir/krel-$kmp)" ]; then
remove_kmp_modules "$kmp" "$krel"
fi
local other_kmp
while read other_kmp; do
[ "$kmp" != "$other_kmp" ] || continue
if can_replace_kmp "" "$other_kmp" "$krel"; then
add_kmp_modules "$other_kmp" "$krel"
break
fi
done < $tmpdir/kmps
if [ -n "$other_kmp" ]; then
log "Package $kmp replaced by package $other_kmp in kernel $krel"
cat $tmpdir/basenames-{$kmp,$other_kmp} \
| run_depmod_and_mkinitrd "$krel" || status=1
else
log "Package $kmp removed from kernel $krel"
run_depmod_and_mkinitrd "$krel" <$tmpdir/basenames-$kmp || \
status=1
fi
fi
done
return $status
}
help() {
cat <<EOF
${0##*/} --add-kmp kmp-name-version-release
To be called in %post of kernel module packages. Creates
symlinks in compatible kernel's weak-updates/ directory and runs
mkinitrd if needed.
${0##*/} --remove-kmp kmp-name < module-list
To be called in %postun of kernel module packages. Removes
weak-updates/ symlinks for this KMP. As the KMP doesn't exist in
the RPM database at this point, the list of modules has to be
passed on standard input. Runs mkinitrd if needed.
${0##*/} --add-kernel kernel-release
To be called in %post of the kernel base package. Adds
compatibility symlinks for all compatible KMPs and runs mkinitrd
if needed.
${0##*/} --remove-kernel kernel-release
To be called in %postun of the kernel base package. Removes all
compatibility symlinks.
${0##*/} --add-kernel-modules kernel-release < module-list
To be called in %post of kernel subpackages that only contain
modules (i.e. not kernel-*-base). Adds newly available
compatibity symlinks and runs mkinitrd if needed.
${0##*/} --remove-kernel-modules kernel-release < module-list
To be called in %postun of kernel subpackages that only contain
modules (i.e. not kernel-*-base). Removes no longer working
compatibity symlinks and runs mkinitrd if needed.
${0##*/} --verbose ...
Print commands as they are executed and other information.
${0##*/} --dry-run ...
Do not perform any changes to the system. Useful together with
--verbose for debugging.
EOF
}
usage() {
echo "Usage:"
help | sed -n 's/^[^[:blank:]]/ &/p'
}
##############################################################################
save_argv=("$@")
options=`getopt -o vh --long add-kernel,remove-kernel,add-kmp,remove-kmp \
--long add-kernel-modules,remove-kernel-modules \
--long usage,help,verbose,dry-run,debug -- "$@"`
if [ $? -ne 0 ]; then
usage >&2
exit 1
fi
eval set -- "$options"
mode=
while :; do
case "$1" in
--add-kernel | --remove-kernel | --add-kernel-modules | \
--remove-kernel-modules | --add-kmp | --remove-kmp )
mode="$1"
;;
-v | --verbose)
opt_verbose=1
;;
--dry-run)
opt_dry_run=1
;;
--debug)
opt_debug=1
;;
--usage)
usage
exit 0
;;
-h | --help)
help
exit 0
;;
--)
shift
break
;;
esac
shift
done
err=
case "$mode" in
"")
err="Please specify one of the --add-* or --remove-* options"
;;
--add-kernel | --remove-kernel)
if [ $# -gt 1 ]; then
err="Too many arguments to $mode"
fi
[ $# -eq 1 ] || set -- $(uname -r)
;;
*)
if [ $# -ne 1 ]; then
err="Option $mode requires exactly one argument"
fi
;;
esac
if [ -n "$err" ]; then
echo "ERROR: $err" >&2
usage >&2
exit 1
fi
#unset LANG LC_ALL LC_COLLATE
tmpdir=$(mktemp -d /var/tmp/${0##*/}.XXXXXX)
trap "rm -rf $tmpdir" EXIT
shopt -s nullglob
case $mode in
--add-kernel)
add_kernel "$1"
;;
--remove-kernel)
remove_kernel "$1"
;;
--add-kernel-modules)
add_kernel_modules "$1"
;;
--remove-kernel-modules)
remove_kernel_modules "$1"
;;
--add-kmp)
add_kmp "$1"
;;
--remove-kmp)
remove_kmp "$1"
esac
# vim:shiftwidth=4 softtabstop=4
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