@@ -5,10 +5,12 @@
#
# Simple script to generate a deb package for a Linux kernel. All the
# complexity of what to do with a kernel after it is installed or removed
-# is left to other scripts and packages: they can install scripts in the
-# /etc/kernel/{pre,post}{inst,rm}.d/ directories (or an alternative location
-# specified in KDEB_HOOKDIR) that will be called on package install and
-# removal.
+# is left to other scripts and packages. Scripts can be placed into the
+# preinst, postinst, prerm and postrm directories in /etc/kernel or
+# /usr/share/kernel. A different list of search directories can be given
+# via KDEB_HOOKDIR. Scripts in directories earlier in the list will
+# override scripts of the same name in later directories. The script will
+# be called on package installation and removal.
set -eu
@@ -68,11 +70,18 @@ install_linux_image () {
# kernel packages, as well as kernel packages built using make-kpkg.
# make-kpkg sets $INITRD to indicate whether an initramfs is wanted, and
# so do we; recent versions of dracut and initramfs-tools will obey this.
- debhookdir=${KDEB_HOOKDIR:-/etc/kernel}
+ debhookdir=${KDEB_HOOKDIR:-/etc/kernel /usr/share/kernel}
+
+ # Only pre-create the first hook directory. Support for more than one hook
+ # directory requires run-parts 5.21 and it is the responsibility of packages
+ # creating additional hook directories to declare that dependency.
+ firsthookdir=${debhookdir%% *}
for script in postinst postrm preinst prerm; do
- mkdir -p "${pdir}${debhookdir}/${script}.d"
+ mkdir -p "${pdir}${firsthookdir}/${script}.d"
+ done
- mkdir -p "${pdir}/DEBIAN"
+ mkdir -p "${pdir}/DEBIAN"
+ for script in postinst postrm preinst prerm; do
cat <<-EOF > "${pdir}/DEBIAN/${script}"
#!/bin/sh
@@ -84,7 +93,26 @@ install_linux_image () {
# Tell initramfs builder whether it's wanted
export INITRD=$(if_enabled_echo CONFIG_BLK_DEV_INITRD Yes No)
- test -d ${debhookdir}/${script}.d && run-parts --arg="${KERNELRELEASE}" --arg="/${installed_image_path}" ${debhookdir}/${script}.d
+ # run-parts will error out if one of its directory arguments does not
+ # exist, so filter the list of hook directories accordingly.
+ hookdirs=
+ for dir in ${debhookdir}; do
+ test -d "\$dir/${script}.d" || continue
+ hookdirs="\$hookdirs \$dir/${script}.d"
+ done
+ hookdirs="\${hookdirs# }"
+ test -n "\$hookdirs" || exit 0
+
+ # If more than one hook directory remained, check version of run-parts. If
+ # run-parts is too old, fall back to only processing the first.
+ case \$hookdirs in *" "*) if ! run-parts --help 2>&1 \
+ | grep -Fxq "Usage: run-parts [OPTION]... DIRECTORY [DIRECTORY ...]"; then
+ echo "E: run-parts >=5.21 is required for multiple hook directories, falling back to $firsthookdir" >&2
+ test -d "${firsthookdir}/${script}.d" || exit 0
+ hookdirs="${firsthookdir}/${script}.d"
+ fi
+ esac
+ run-parts --arg="${KERNELRELEASE}" --arg="/${installed_image_path}" \$hookdirs
exit 0
EOF
chmod 755 "${pdir}/DEBIAN/${script}"
By passing an additional directory to run-parts, allow Debian and its derivatives an easy way to ship maintainer scripts in /usr while at the same time allowing the local admin to easily override or disable them by placing hooks of the same name in /etc. This adds support for the mechanism described in the UAPI Configuration Files Specification for kernel hooks: https://uapi-group.org/specifications/specs/configuration_files_specification/ This functionality relies on run-parts 5.21 or later. It is the responsibility of packages installing hooks into /usr/share/kernel to also declare a Depends: debianutils (>= 5.21). KDEB_HOOKDIR can be used to change the list of directories that is searched. By default, /etc/kernel and /usr/share/kernel are hook directories. Signed-off-by: Johannes Schauer Marin Rodrigues <josch@mister-muffin.de> --- scripts/package/builddeb | 44 ++++++++++++++++++++++++++++++++-------- 1 file changed, 36 insertions(+), 8 deletions(-)