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8fa8d8c0bc
kmod/weak-modules
Eugene Syromiatnikov 8fa8d8c0bc weak-modules: use a proper program for dumping symvers 
Previously it was assumed that symvers is in gzip format, which
is no longer the case, so zcat was used.  Dispatch based on the symvers
file extension.

Resolves: RHEL-39388
Signed-off-by: Eugene Syromiatnikov <esyr@redhat.com>
2024-08-12 16:12:00 +02:00

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#!/bin/bash
#
# weak-modules - determine which modules are kABI compatible with installed
# kernels and set up the symlinks in /lib/*/weak-updates.
#
unset LANG LC_ALL LC_COLLATE
tmpdir=$(mktemp -td ${0##*/}.XXXXXX)
trap "rm -rf $tmpdir" EXIT
unset ${!changed_modules_*} ${!changed_initramfs_*}
unset BASEDIR
unset CHECK_INITRAMFS
weak_updates_dir_override=""
default_initramfs_prefix="/boot" # will be combined with BASEDIR
dracut="/usr/bin/dracut"
depmod="/sbin/depmod"
depmod_orig="$depmod"
declare -a modules
declare -A module_krels
declare -A weak_modules_before
declare -A groups
declare -A grouped_modules
# output of validate_weak_links, one iteration
# short_name -> path
declare -A compatible_modules
# state for update_modules_for_krel (needed for add_kernel case)
# short_name -> path
declare -A installed_modules
# doit:
# A wrapper used whenever we're going to perform a real operation.
doit() {
[ -n "$verbose" ] && echo "$@"
[ -n "$dry_run" ] || "$@"
}
# pr_verbose:
# print verbose -- wrapper used to print extra messages if required
pr_verbose() {
[ -n "$verbose" ] && echo "$@"
}
# pr_warning:
# print warning
pr_warning() {
echo "WARNING: $*"
}
# rpmsort: The sort in coreutils can't sort the RPM list how we want it so we
# instead transform the list into a form it will sort correctly, then sort.
rpmsort() {
local IFS=$' '
REVERSE=""
rpmlist=($(cat))
if [ "-r" == "$1" ];
then
REVERSE="-r"
fi
echo ${rpmlist[@]} | \
sed -e 's/-/../g' | \
sort ${REVERSE} -n -t"." -k1,1 -k2,2 -k3,3 -k4,4 -k5,5 -k6,6 -k7,7 \
-k8,8 -k9,9 -k10,10 | \
sed -e 's/\.\./-/g'
}
# krel_of_module:
# Compute the kernel release of a module.
krel_of_module() {
local module="$1"
if [ x"${module_krels[$module]+set}" = x"set" ]; then
# version cached in the array already
echo "${module_krels[$module]}"
elif [ -f "$module" ]; then
krel_of_module_modinfo "$module"
else
# Try to extract the kernel release from the path
# delete case, the .ko already deleted
set -- "${module#*/lib/modules/}"
echo "${1%%/*}"
fi
}
# krel_of_module_modinfo:
# Fetches module version from internal module info
krel_of_module_modinfo() {
local module="$1"
/sbin/modinfo -F vermagic "$module" | awk '{print $1}'
}
# weak_updates_dir:
# gives the root directory for the weak-updates
# We need some flexibility here because of dry-run.
weak_updates_dir() {
local krel="$1"
if [[ -z "$weak_updates_dir_override" ]]; then
echo "$BASEDIR/lib/modules/$krel/weak-updates"
else
echo "$weak_updates_dir_override"
fi
}
# read_modules_list:
# Read in a list of modules from standard input. Convert the filenames into
# absolute paths and compute the kernel release for each module (either using
# the modinfo section or through the absolute path.
# If used with input redirect, should be used as read_module_list < input,
# not input | read_modules_list, the latter spawns a subshell
# and the arrays are not seen in the caller
read_modules_list() {
local IFS=$'\n'
modules=($(cat))
for ((n = 0; n < ${#modules[@]}; n++)); do
if [ ${modules[n]:0:1} != '/' ]; then
modules[n]="$PWD/${modules[n]}"
fi
module_krels["${modules[n]}"]=$(krel_of_module ${modules[n]})
done
}
decompress_initramfs() {
local input=$1
local output=$2
# First, check if this is compressed at all
if cpio -i -t < "$input" > /dev/null 2>/dev/null; then
# If this archive contains a file early_cpio, it's a trick. Strip off
# the early cpio archive and try again.
if cpio -i -t < "$input" 2>/dev/null | grep -q '^early_cpio$' ; then
/usr/lib/dracut/skipcpio "$input" > "${tmpdir}/post_early_cpio.img"
decompress_initramfs "${tmpdir}/post_early_cpio.img" "$output"
retval="$?"
rm -f "${tmpdir}/post_early_cpio.img"
return $retval
fi
cp "$input" "$output"
return 0
fi
# Try gzip
if gzip -cd < "$input" > "$output" 2>/dev/null ; then
return 0
fi
# Next try xz
if xz -cd < "$input" > "$output" 2>/dev/null ; then
return 0
fi
echo "Unable to decompress $input: Unknown format" >&2
return 1
}
# List all module files and modprobe configuration that could require a new
# initramfs. The current directory must be the root of the uncompressed
# initramfs. The unsorted list of files is output to stdout.
list_module_files() {
find . -iname \*.ko -o -iname '*.ko.xz' -o -iname '*.ko.gz' 2>/dev/null
find etc/modprobe.d usr/lib/modprobe.d -name \*.conf 2>/dev/null
}
# read_old_initramfs:
compare_initramfs_modules() {
local old_initramfs=$1
local new_initramfs=$2
rm -rf "$tmpdir/old_initramfs"
rm -rf "$tmpdir/new_initramfs"
mkdir "$tmpdir/old_initramfs"
mkdir "$tmpdir/new_initramfs"
decompress_initramfs "$old_initramfs" "$tmpdir/old_initramfs.img"
pushd "$tmpdir/old_initramfs" >/dev/null || exit
cpio -i < "$tmpdir/old_initramfs.img" 2>/dev/null
rm "$tmpdir/old_initramfs.img"
n=0; for i in `list_module_files|sort`; do
old_initramfs_modules[n]="$i"
n=$((n+1))
done
popd >/dev/null || exit
decompress_initramfs "$new_initramfs" "$tmpdir/new_initramfs.img"
pushd "$tmpdir/new_initramfs" >/dev/null || exit
cpio -i < "$tmpdir/new_initramfs.img" 2>/dev/null
rm "$tmpdir/new_initramfs.img"
n=0; for i in `list_module_files|sort`; do
new_initramfs_modules[n]="$i"
n=$((n+1))
done
popd >/dev/null || exit
# Compare the length and contents of the arrays
if [ "${#old_initramfs_modules[@]}" == "${#new_initramfs_modules[@]}" -a \
"${old_initramfs_modules[*]}" == "${new_initramfs_modules[*]}" ];
then
# If the file lists are the same, compare each file to find any that changed
for ((n = 0; n < ${#old_initramfs_modules[@]}; n++)); do
if ! cmp "$tmpdir/old_initramfs/${old_initramfs_modules[n]}" \
"$tmpdir/new_initramfs/${new_initramfs_modules[n]}" \
>/dev/null 2>&1
then
return 1
fi
done
else
return 1
fi
return 0
}
# check_initramfs:
# check and possibly also update the initramfs for changed kernels
check_initramfs() {
local kernel=$1
# If there is no initramfs already we will not make one here.
if [ -e "$initramfs_prefix/initramfs-$kernel.img" ];
then
old_initramfs="$initramfs_prefix/initramfs-$kernel.img"
tmp_initramfs="$initramfs_prefix/initramfs-$kernel.tmp"
new_initramfs="$initramfs_prefix/initramfs-$kernel.img"
$dracut -f "$tmp_initramfs" "$kernel"
if ! compare_initramfs_modules "$old_initramfs" "$tmp_initramfs";
then
doit mv "$tmp_initramfs" "$new_initramfs"
else
rm -f "$tmp_initramfs"
fi
fi
}
usage() {
echo "Usage: ${0##*/} [options] {--add-modules|--remove-modules}"
echo "${0##*/} [options] {--add-kernel|--remove-kernel} {kernel-release}"
cat <<'EOF'
--add-modules
Add a list of modules read from standard input. Create
symlinks in compatible kernel's weak-updates/ directory.
The list of modules is read from standard input.
--remove-modules
Remove compatibility symlinks from weak-updates/ directories
for a list of modules. The list of modules is read from
standard input. Note: it doesn't attempt to locate any
compatible modules to replace those being removed.
--add-kernel
Add compatibility symlinks for all compatible modules to the
specified or running kernel.
--remove-kernel
Remove all compatibility symlinks for the specified or current
kernel.
--no-initramfs
Do not generate an initramfs.
--verbose
Print the commands executed.
--dry-run
Do not create/remove any files.
EOF
exit $1
}
# module_has_changed:
# Mark if an actual change occured that we need to deal with later by calling
# depmod or mkinitramfs against the affected kernel.
module_has_changed() {
declare module=$1 krel=$2
declare orig_module=$module
module=${module%.ko}
[[ $module == $orig_module ]] && module=${module%.ko.xz}
[[ $module == $orig_module ]] && module=${module%.ko.gz}
module=${module##*/}
eval "changed_modules_${krel//[^a-zA-Z0-9]/_}=$krel"
eval "changed_initramfs_${krel//[^a-zA-Z0-9]/_}=$krel"
}
# module_weak_link:
# Generate a weak link path for the module.
# Takes module file name and the target kernel release as arguments
# The way of generation intentionally left from the initial version
module_weak_link() {
local module="$1"
local krel="$2"
local module_krel
local subpath
local module_krel_escaped
module_krel="$(krel_of_module "$module")"
module_krel_escaped=$(echo "$module_krel" | \
sed 's/\([.+?^$\/\\|()\[]\|\]\)/\\\0/g')
subpath=$(echo $module | sed -nre "s:$BASEDIR(/usr)?/lib/modules/$module_krel_escaped/([^/]*)/(.*):\3:p")
if [[ -z $subpath ]]; then
# module is not in /lib/modules/$krel?
# It's possible for example for Oracle ACFS compatibility check
# Install it with its full path as a /lib/modules subpath
subpath="$module"
fi
echo "$(weak_updates_dir $krel)/${subpath#/}"
}
# module_short_name:
# 'basename' version purely in bash, cuts off path from the filename
module_short_name() {
echo "${1##*/}"
}
#### Helper predicates
# is_weak_for_module_valid:
# Takes real module filename and target kernel as arguments.
# Calculates weak symlink filename for the corresponding module
# for the target kernel,
# returns 'true' if the symlink filename is a symlink
# and the symlink points to a readable file
# EVEN if it points to a different filename
is_weak_for_module_valid() {
local module="$1"
local krel="$2"
local weak_link
weak_link="$(module_weak_link $module $krel)"
[[ -L "$weak_link" ]] && [[ -r "$weak_link" ]]
}
# is_weak_link:
# Takes a filename and a kernel release.
# 'true' if the filename is symlink under weak-updates/ for the kernel.
# It doesn't matter, if it's a valid symlink (points to a real file) or not.
is_weak_link() {
local link="$1"
local krel="$2"
echo $link | grep -q "$(weak_updates_dir $krel)" || return 1
[[ -L $link ]]
}
# is_extra_exists:
# Takes a module filename, the module's kernel release and target kernel release.
# The module filename should be a real, not a symlink, filename (i.e. in extra/).
# Returns 'true' if the same module exists for the target kernel.
is_extra_exists() {
local module="$1"
local module_krel="$2"
local krel="$3"
local subpath="${module#*/lib/modules/$module_krel/extra/}"
[[ -f $BASEDIR/lib/modules/$krel/extra/$subpath ]]
}
is_kernel_installed() {
local krel="$1"
find_symvers_file "$krel" > /dev/null &&
find_systemmap_file "$krel" > /dev/null
}
is_empty_file() {
local file="$1"
[[ "$(wc -l "$file" | cut -f 1 -d ' ')" == 0 ]]
}
#### Helpers
# find_modules:
# Takes kernel release and a list of subdirectories.
# Produces list of module files in the subdirectories for the kernel
find_modules() {
local krel="$1"
shift
local dirs="$*"
for dir in $dirs; do
find $BASEDIR/lib/modules/$krel/$dir \
-name '*.ko' -o -name '*.ko.xz' -o -name '*.ko.gz' \
2>/dev/null
done
}
# find_modules_dirs:
# Takes a list of directories.
# Produces list of module files in the subdirectories
find_modules_dirs() {
local dirs="$*"
for dir in $dirs; do
find $dir -name '*.ko' -o -name '*.ko.xz' -o -name '*.ko.gz' \
2>/dev/null
done
}
# find_installed_kernels:
# Produces list of kernels, which modules are still installed
find_installed_kernels() {
ls $BASEDIR/lib/modules/
}
# find_kernels_with_extra:
# Produces list of kernels, where exists extra/ directory
find_kernels_with_extra() {
local krel
local extra_dir
for krel in $(find_installed_kernels); do
extra_dir="$BASEDIR/lib/modules/$krel/extra"
[[ -d "$extra_dir" ]] || continue
echo "$krel"
done
}
# remove_weak_link_quiet:
# Takes symlink filename and target kernel release.
# Removes the symlink and the directory tree
# if it was the last file in the tree
remove_weak_link_quiet() {
local link="$1"
local krel="$2"
local subpath="${link#*$(weak_updates_dir $krel)}"
rm -f $link
( cd "$(weak_updates_dir $krel)" && \
rmdir --parents --ignore-fail-on-non-empty "$(dirname "${subpath#/}")" 2>/dev/null )
}
# prepare_sandbox:
# Takes kernel release, creates temporary weak-modules directory for it
# and depmod config to operate on it.
# Sets the global state accordingly
prepare_sandbox() {
local krel="$1"
local orig_dir
local dir
local conf="$tmpdir/depmod.conf"
#directory
orig_dir=$(weak_updates_dir $krel)
dir="$tmpdir/$krel/weak-updates"
mkdir -p "$dir"
# the orig_dir can be empty
cp -R "$orig_dir"/* "$dir" 2>/dev/null
weak_updates_dir_override="$dir"
#config
echo "search external extra built-in weak-updates" >"$conf"
echo "external * $dir" >>"$conf"
depmod="$depmod_orig -C $conf"
}
# discard_installed:
# remove installed_modules[] from modules[]
discard_installed()
{
local short_name
for m in "${!modules[@]}"; do
short_name="$(module_short_name "${modules[$m]}")"
[[ -z "${installed_modules[$short_name]}" ]] && continue
unset "modules[$m]"
done
}
# update_installed:
# add compatible_modules[] to installed_modules[]
update_installed()
{
for m in "${!compatible_modules[@]}"; do
installed_modules[$m]="${compatible_modules[$m]}"
done
}
# finish_sandbox:
# restore global state after sandboxing
# copy configuration to the kernel directory if not dry run
finish_sandbox() {
local krel="$1"
local override="$weak_updates_dir_override"
local wa_dir
weak_updates_dir_override=""
depmod="$depmod_orig"
[[ -n "$dry_run" ]] && return
wa_dir="$(weak_updates_dir $krel)"
rm -rf "$wa_dir"
mkdir -p "$wa_dir"
cp -R "${override}"/* "$wa_dir" 2>/dev/null
}
# Auxiliary functions to find symvers file
make_kernel_file_names() {
local krel="$1"
shift
local file="$1"
shift
for suffix in "$@"; do
echo "${BASEDIR}/boot/${file}-${krel}${suffix}"
echo "${BASEDIR}/lib/modules/${krel}/${file}${suffix}"
done
}
find_kernel_file() {
local krel="$1"
shift
local file="$1"
shift
local print="$1"
shift
local i
if [[ "$print" != "" ]]; then
make_kernel_file_names "$krel" "$file" "$@"
return 0
fi
for i in $(make_kernel_file_names "$krel" "$file" "$@"); do
if [[ -r "$i" ]]; then
echo "$i"
return 0
fi
done
return 1
}
# find_symvers_file:
# Since /boot/ files population process is now controlled by systemd's
# kernel-install bash script and its plug-ins, it might be the case
# that, while present, symvers file is not populated in /boot.
# Let's also check for /lib/modules/$kver/symvers.gz, since that's where
# it is populated from.
#
# $1 - krel
# return - 0 if symvers file is found, 1 otherwise.
# Prints symvers path if found, empty string otherwise.
find_symvers_file() {
local krel="$1"
local print="$2"
find_kernel_file "$krel" symvers "$print" .xz .gz
}
# find_systemmap_file:
# Same as above but for System.map
find_systemmap_file() {
local krel="$1"
local print="$2"
local no_suffix=""
find_kernel_file "$krel" System.map "$print" "$no_suffix"
}
#### Main logic
# update_modules_for_krel:
# Takes kernel release and "action" function name.
# Skips kernel without symvers,
# otherwise triggers the main logic of modules installing/removing
# for the given kernel, which is:
# - save current state of weak modules symlinks
# - install/remove the symlinks for the given (via stdin) list of modules
# - validate the state and remove invalid symlinks
# (for the modules, which are not compatible (became incompatible) for
# the given kernel)
# - check the state after validation to produce needed messages
# and trigger initrd regeneration if the list changed.
#
update_modules_for_krel() {
local krel="$1"
local func="$2"
local force_update="$3"
is_kernel_installed "$krel" || return
prepare_sandbox $krel
global_link_state_save $krel
# remove already installed from modules[]
discard_installed
# do not run heavy validation procedure if no modules to install
if [[ "${#modules[@]}" -eq 0 ]]; then
finish_sandbox $krel
return
fi
$func $krel
if ! validate_weak_links $krel && [[ -z "$force_update" ]]; then
global_link_state_restore $krel
fi
# add compatible to installed
update_installed
global_link_state_announce_changes $krel
finish_sandbox $krel
}
# update_modules:
# Common entry point for add/remove modules command
# Takes the "action" function, the module list is supplied via stdin.
# Reads the module list and triggers modules update for all installed
# kernels.
# Triggers initrd rebuild for the kernels, which modules are installed.
update_modules() {
local func="$1"
local force_update="$2"
local module_krel
declare -a saved_modules
read_modules_list || exit 1
[[ ${#modules[@]} -gt 0 ]] || return
saved_modules=("${modules[@]}")
for krel in $(find_installed_kernels); do
update_modules_for_krel $krel $func $force_update
modules=("${saved_modules[@]}")
installed_modules=()
done
for module in "${modules[@]}"; do
# Module was built against this kernel, update initramfs.
module_krel="${module_krels[$module]}"
module_has_changed $module $module_krel
done
}
# add_weak_links:
# Action function for the "add-modules" command
# Takes the kernel release, where the modules are added
# and the modules[] and module_krels[] global arrays.
# Install symlinks for the kernel with minimal checks
# (just filename checks, no symbol checks)
add_weak_links() {
local krel="$1"
local module_krel
local weak_link
for module in "${modules[@]}"; do
module_krel="$(krel_of_module $module)"
case "$module" in
$BASEDIR/lib/modules/$krel/*)
# Module already installed to the current kernel
continue ;;
esac
if is_extra_exists $module $module_krel $krel; then
pr_verbose "found $(module_short_name $module) for $krel while installing for $module_krel, update case?"
fi
if is_weak_for_module_valid $module $krel; then
pr_verbose "weak module for $(module_short_name $module) already exists for kernel $krel, update case?"
# we should update initrd in update case,
# the change is not seen by the symlink detector
# (global_link_state_announce_changes())
module_has_changed $module $krel
fi
weak_link="$(module_weak_link $module $krel)"
mkdir -p "$(dirname $weak_link)"
ln -sf $module $weak_link
done
}
# remove_weak_links:
# Action function for the "remove-modules" command
# Takes the kernel release, where the modules are removed
# and the modules[] and module_krels[] global arrays.
# Removes symlinks from the given kernel if they are installed
# for the modules in the list.
remove_weak_links() {
local krel="$1"
local weak_link
local target
local module_krel
for module in "${modules[@]}"; do
module_krel="$(krel_of_module $module)"
weak_link="$(module_weak_link $module $krel)"
target="$(readlink $weak_link)"
if [[ "$module" != "$target" ]]; then
pr_verbose "Skipping symlink $weak_link"
continue
fi
# In update case the --remove-modules call is performed
# after --add-modules (from postuninstall).
# So, we shouldn't really remove the symlink in this case.
# But in the remove case the actual target already removed.
if ! is_weak_for_module_valid "$module" "$krel"; then
remove_weak_link_quiet "$weak_link" "$krel"
fi
done
}
# validate_weak_links:
# Takes kernel release.
# Checks if all the weak symlinks are suitable for the given kernel.
# Uses depmod to perform the actual symbol checks and parses the output.
# Since depmod internally creates the module list in the beginning of its work
# accroding to the priority list in its configuration, but without symbol
# check and doesn't amend the list during the check, the function runs it
# in a loop in which it removes discovered incompatible symlinks
#
# Returns 0 (success) if proposal is fine or
# 1 (false) if some incompatible symlinks were removed
# initializes global hashmap compatible_modules with all the valid ones
validate_weak_links() {
local krel="$1"
local basedir=${BASEDIR:+-b $BASEDIR}
local tmp
declare -A symbols
local is_updates_changed=1
local module
local module_krel
local target
local modpath
local symbol
local weak_link
# to return to caller that original proposal is not valid
# here 0 is true, 1 is false, since it will be the return code
local is_configuration_valid=0
local cat_prog
tmp=$(mktemp -p $tmpdir)
compatible_modules=()
if ! [[ -e $tmpdir/symvers-$krel ]]; then
local symvers_path=$(find_symvers_file "$krel")
[[ -n "$symvers_path" ]] || return
cat_prog="cat"
case "$symvers" in
*.gz) cat_prog="zcat" ;;
*.xz) cat_prog="xzcat" ;;
esac
"$cat_prog" "$symvers_path" > $tmpdir/symvers-$krel
fi
while ((is_updates_changed)); do
is_updates_changed=0
# again $tmp because of subshell, see read_modules_list() comment
# create incompatibility report by depmod
# Shorcut if depmod finds a lot of incompatible modules elsewhere,
# we care only about weak-updates
$depmod $basedir -naeE $tmpdir/symvers-$krel $krel 2>&1 1>/dev/null | \
grep "$(weak_updates_dir $krel)" 2>/dev/null >$tmp
# parse it into symbols[] associative array in form a-la
# symbols["/path/to/the/module"]="list of bad symbols"
while read line; do
set -- $(echo $line | awk '/needs unknown symbol/{print $3 " " $NF}')
modpath=$1
symbol=$2
if [[ -n "$modpath" ]]; then
symbols[$modpath]="${symbols[$modpath]} $symbol"
continue
fi
set -- $(echo $line | awk '/disagrees about version of symbol/{print $3 " " $NF}')
modpath=$1
symbol=$2
if [[ -n "$modpath" ]]; then
symbols[$modpath]="${symbols[$modpath]} $symbol"
continue
fi
done < $tmp
# loop through all the weak links from the list of incompatible
# modules and remove them. Skips non-weak incompatibilities
for modpath in "${!symbols[@]}"; do
is_weak_link $modpath $krel || continue
target=$(readlink $modpath)
module_krel=$(krel_of_module $target)
remove_weak_link_quiet "$modpath" "$krel"
pr_verbose "Module $(module_short_name $modpath) from kernel $module_krel is not compatible with kernel $krel in symbols: ${symbols[$modpath]}"
is_updates_changed=1
is_configuration_valid=1 # inversed value
done
done
rm -f $tmp
# this loop is just to produce verbose compatibility messages
# for the compatible modules
for module in "${modules[@]}"; do
is_weak_for_module_valid $module $krel || continue
weak_link="$(module_weak_link $module $krel)"
target="$(readlink $weak_link)"
module_krel=$(krel_of_module $target)
if [[ "$module" == "$target" ]]; then
short_name="$(module_short_name "$module")"
compatible_modules+=([$short_name]="$module")
pr_verbose "Module ${module##*/} from kernel $module_krel is compatible with kernel $krel"
fi
done
return $is_configuration_valid
}
# global_link_state_save:
# Takes kernel release
# Saves the given kernel's weak symlinks state into the global array
# weak_modules_before[] for later processing
global_link_state_save() {
local krel="$1"
local link
local target
weak_modules_before=()
for link in $(find_modules_dirs $(weak_updates_dir $krel) | xargs); do
target=$(readlink $link)
weak_modules_before[$link]=$target
done
}
# global_link_state_restore:
# Takes kernel release
# Restores the previous weak links state
# (for example, if incompatible modules were installed)
global_link_state_restore() {
local krel="$1"
local link
local target
pr_verbose "Falling back weak-modules state for kernel $krel"
( cd "$(weak_updates_dir $krel)" 2>/dev/null && rm -rf * )
for link in "${!weak_modules_before[@]}"; do
target=${weak_modules_before[$link]}
mkdir -p "$(dirname $link)"
ln -sf $target $link
done
}
# global_link_state_announce_changes:
# Takes kernel release
# Reads the given kernel's weak symlinks state, compares to the saved,
# triggers initrd rebuild if there were changes
# and produces message on symlink removal
global_link_state_announce_changes() {
local krel="$1"
local link
local target
local new_target
declare -A weak_modules_after
for link in $(find_modules_dirs $(weak_updates_dir $krel) | xargs); do
target=${weak_modules_before[$link]}
new_target=$(readlink $link)
weak_modules_after[$link]=$new_target
# report change of existing link and appearing of a new link
[[ "$target" == "$new_target" ]] || module_has_changed $new_target $krel
done
for link in "${!weak_modules_before[@]}"; do
target=${weak_modules_before[$link]}
new_target=${weak_modules_after[$link]}
# report change of existing link and disappearing of an old link
[[ "$target" == "$new_target" ]] && continue
module_has_changed $target $krel
[[ -n "$new_target" ]] ||
pr_verbose "Removing compatible module $(module_short_name $target) from kernel $krel"
done
}
# remove_modules:
# Read in a list of modules from stdinput and process them for removal.
# Parameter (noreplace) is deprecated, acts always as "noreplace".
# There is no sense in the "replace" functionality since according
# to the current requirements RPM will track existing of only one version
# of extra/ module (no same extra/ modules for different kernels).
remove_modules() {
update_modules remove_weak_links force_update
}
# add_modules:
# Read in a list of modules from stdinput and process them for compatibility
# with installed kernels under /lib/modules.
add_modules() {
no_force_update=""
update_modules add_weak_links $no_force_update
}
# do_make_groups:
# Takes tmp file which contains preprocessed modules.dep
# output (or modules.dep)
#
# reads modules.dep format information from stdin
# produces groups associative array
# the group is a maximum subset of modules having at least a link
#
# more fine tuned extra filtering.
do_make_groups()
{
local tmp="$1"
local group_name
local mod
declare -a mods
while read i; do
read -a mods <<< "$i"
echo "${mods[0]}" |grep -q "extra/" || continue
# if the module already met, then its dependencies already counted
module_group="${grouped_modules[${mods[0]}]}"
[[ -n $module_group ]] && continue
# new group
group_name="${mods[0]}"
for mod in "${mods[@]}"; do
echo "$mod" |grep -q "extra/" || continue
# if there is already such group,
# it is a subset of the one being created
# due to depmod output
unset groups[$mod]
# extra space doesn't matter, since later (in add_kernel())
# it is expanded without quotes
groups[$group_name]+=" $mod"
grouped_modules[$mod]=$group_name
done
done < $tmp # avoid subshell
}
# filter_depmod_deps:
# preprocess output for make_groups
# depmod -n produces also aliases, so it cuts them off
# also it removes colon after the first module
cut_depmod_deps()
{
awk 'BEGIN { pr = 1 } /^#/{ pr = 0 } pr == 1 {sub(":",""); print $0}'
}
# filter_extra_absoluted:
# Takes kernel version
# makes full path from the relative module path
# (produced by depmod for in-kernel-dir modules)
# filter only extra/ modules
filter_extra_absoluted()
{
local kver="$1"
local mod
declare -a mods
while read i; do
# skip non-extra. The check is not perfect, but ok
# to speed up handling in general cases
echo "$i" |grep -q "extra/" || continue
read -a mods <<< "$i"
for j in "${!mods[@]}"; do
mod="${mods[$j]}"
[[ ${mod:0:1} == "/" ]] || mod="$BASEDIR/lib/modules/$kver/$mod"
mods[$j]="$mod"
done
echo "${mods[@]}"
done
}
# make_groups:
# takes k -- kernel version, we are installing extras from
# prepares and feeds to do_make_groups
# to create the module groups (global)
make_groups()
{
local k="$1"
local tmp2=$(mktemp -p $tmpdir)
local basedir=${BASEDIR:+-b $BASEDIR}
groups=()
grouped_modules=()
$depmod -n $basedir $k 2>/dev/null |
cut_depmod_deps | filter_extra_absoluted $k > $tmp2
do_make_groups $tmp2
rm -f $tmp2
}
add_kernel() {
local krel=${1:-$(uname -r)}
local tmp
local no_force_update=""
local num
tmp=$(mktemp -p $tmpdir)
if ! find_symvers_file "$krel" > /dev/null; then
echo "Symvers dump file is not found in" \
$(find_symvers_file "$krel" print) >&2
exit 1
fi
for k in $(find_kernels_with_extra | rpmsort -r); do
[[ "$krel" == "$k" ]] && continue
find_modules $k extra > $tmp
is_empty_file "$tmp" || make_groups $k
# reuse tmp
# optimization, check independent modules in one run.
# first try groups with one element in each.
# it means independent modules, so we can safely remove
# incompatible links
# some cut and paste here
echo > $tmp
for g in "${groups[@]}"; do
num="$(echo "$g" | wc -w)"
[ "$num" -gt 1 ] && continue
printf '%s\n' $g >> $tmp
done
# to avoid subshell, see the read_modules_list comment
read_modules_list < $tmp
update_modules_for_krel $krel add_weak_links force_update
for g in "${groups[@]}"; do
num="$(echo "$g" | wc -w)"
[ "$num" -eq 1 ] && continue
printf '%s\n' $g > $tmp
read_modules_list < $tmp
update_modules_for_krel $krel add_weak_links $no_force_update
done
done
rm -f $tmp
}
remove_kernel() {
remove_krel=${1:-$(uname -r)}
weak_modules="$(weak_updates_dir $remove_krel)"
module_has_changed $weak_modules $remove_krel
# Remove everything beneath the weak-updates directory
( cd "$weak_modules" && doit rm -rf * )
}
################################################################################
################################## MAIN GUTS ###################################
################################################################################
options=`getopt -o h --long help,add-modules,remove-modules \
--long add-kernel,remove-kernel \
--long dry-run,no-initramfs,verbose,delete-modules \
--long basedir:,dracut:,check-initramfs-prog: -- "$@"`
[ $? -eq 0 ] || usage 1
eval set -- "$options"
while :; do
case "$1" in
--add-modules)
do_add_modules=1
;;
--remove-modules)
do_remove_modules=1
;;
--add-kernel)
do_add_kernel=1
;;
--remove-kernel)
do_remove_kernel=1
;;
--dry-run)
dry_run=1
# --dry-run option is not pure dry run anymore,
# because of depmod used internally.
# For add/remove modules we have to add/remove the symlinks
# and just restore the original configuration afterwards.
;;
--no-initramfs)
no_initramfs=1
;;
--verbose)
verbose=1
;;
--delete-modules)
pr_warning "--delete-modules is deprecated, no effect"
;;
--basedir)
BASEDIR="$2"
shift
;;
--dracut)
dracut="$2"
shift
;;
--check-initramfs-prog)
CHECK_INITRAMFS="$2"
shift
;;
-h|--help)
usage 0
;;
--)
shift
break
;;
esac
shift
done
if [ ! -x "$dracut" ]
then
echo "weak-modules: could not find dracut at $dracut"
exit 1
fi
initramfs_prefix="$BASEDIR/${default_initramfs_prefix#/}"
if [ -n "$do_add_modules" ]; then
add_modules
elif [ -n "$do_remove_modules" ]; then
remove_modules
elif [ -n "$do_add_kernel" ]; then
kernel=${1:-$(uname -r)}
add_kernel $kernel
elif [ -n "$do_remove_kernel" ]; then
kernel=${1:-$(uname -r)}
remove_kernel $kernel
exit 0
else
usage 1
fi
################################################################################
###################### CLEANUP POST ADD/REMOVE MODULE/KERNEL ###################
################################################################################
# run depmod and dracut as needed
for krel in ${!changed_modules_*}; do
krel=${!krel}
basedir=${BASEDIR:+-b $BASEDIR}
if is_kernel_installed $krel; then
doit $depmod $basedir -ae -F $(find_systemmap_file $krel) $krel
else
pr_verbose "Skipping depmod for non-installed kernel $krel"
fi
done
for krel in ${!changed_initramfs_*}; do
krel=${!krel}
if [ ! -n "$no_initramfs" ]; then
${CHECK_INITRAMFS:-check_initramfs} $krel
fi
done
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