ACC SHELL
#! /bin/bash
# FIXME: move the entire depmod / mkinitrd logic from the kernel and kmp
# %post scripts here -- how?
##############################################################################
# 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 linked to from this kernel?
kmp_is_present() {
local kmp=$1 krel=$2
local module symlink
while read module; do
symlink=$(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=$3
local weak_updates=$basedir/lib/modules/$krel/weak-updates/
[ -d "$weak_updates" ] || return 0
[ -z "$(comm -1 -2 $tmpdir/basenames-$kmp \
<(find "$weak_updates" -not -type d -printf '%f\n' \
| sort -u))" ]
}
# 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"
}
# test if mkinitrd is needed for $krel. This should be decided by initrd itself
# actually
# 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 [[ "$krel" == *kdump* ]] ; then
return 1
fi
if ! [ -f /etc/fstab -a ! -e /.buildenv -a -x /sbin/mkinitrd ] ; then
echo "Please run mkinitrd as soon as your system is complete." >&2
return 1
fi
if [ "$changed_basenames" = "_kernel_" ]; then
return 0
fi
if [ ! -e /boot/initrd-$krel ]; then
return 0
fi
local initrd_basenames=($( (gzip -cd /boot/initrd-$krel | cpio -t --quiet | 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 $krel; then
local image
for x in vmlinuz image vmlinux linux bzImage; do
if [ -f /boot/$x-$krel ]; then
image=$x
break
fi
done
if [ -n "$image" ]; then
doit /sbin/mkinitrd -k /boot/$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
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 [ $krel = "$(cat $tmpdir/krel-$kmp)" ] || \
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
}
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/}
[ -d $dir -a -f /boot/System.map-$krel ] || continue
if [ $krel = "$(cat $tmpdir/krel-$kmp)" ] || \
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/}
[ -d $dir -a -f /boot/System.map-$krel ] || continue
if [ $krel = "$(cat $tmpdir/krel-$kmp)" ]; then
# rpm -e removed some /lib/modules/$krel/updates/*.ko
run_depmod_and_mkinitrd "$krel" <$tmpdir/basenames-$kmp || status=1
continue
fi
if kmp_is_present $kmp $krel; then
remove_kmp_modules "$kmp" "$krel"
local other_kmp
while read other_kmp; do
[ "$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
ACC SHELL 2018