File weak-modules2 of Package module-init-tools

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File weak-modules2 of Package module-init-tools

#! /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

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File weak-modules2 of Package module-init-tools

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