From d9f5d3bd972f2d8c8f260693c172774ae0db707b Mon Sep 17 00:00:00 2001
From: Jonathan Bauer
Date: Thu, 23 Aug 2018 14:07:54 +0200
Subject: autodetect libkmod version to decide which dracut version to install

---
 builder/build-initramfs.sh | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

(limited to 'builder/build-initramfs.sh')

diff --git a/builder/build-initramfs.sh b/builder/build-initramfs.sh
index 0a0dc493..a646018c 100755
--- a/builder/build-initramfs.sh
+++ b/builder/build-initramfs.sh
@@ -67,7 +67,6 @@ core.import change_root
 # region properties
 # shellcheck disable=SC2034
 build_initramfs__doc_test_setup__='exceptions.activate'
-dracut_resource_url='https://www.kernel.org/pub/linux/utils/boot/dracut/dracut-047.tar.gz'
 file_path='/boot/initramfs.img'
 dracut_parameter=(--force --no-hostonly)
 verbose='no'
@@ -85,6 +84,7 @@ declare -A core_dependencies=(
     [dmsetup]='create a (temporary) writable layer during boot' \
     [grep]='retrieve right boot partition during boot' \
     [mktemp]='create save temporary files and dictionaries' \
+    [pkg-config]='retrieve information of installed development packages' \
     [tee]='read from standard input and write to standard output and files' \
     [readlink]="connect dracut module with dracut's module system" \
     [rm]='remove (temporary) files' \
@@ -429,10 +429,20 @@ initialize_dracut() {
 
     `initialize_dracut`
     '
+    # First check what version to get
+    # Autodetect the kmod version present on the system to decide which dracut version to get
+    #  * v47 requires kmod >= 23 (Available in Ubuntu 18.04)
+    #  * v46 works with kmod == 20 (CentOS 7.5 only provides kmod v20)
+    if [ "$(pkg-config --modversion libkmod)" -ge 23 ]; then
+        dracut_version="047"
+    else
+        dracut_version="046"
+    fi
+    dracut_resource_url="https://www.kernel.org/pub/linux/utils/boot/dracut/dracut-$dracut_version.tar.gz"
     if [[ ! -f "${_root_dir}/dracut/install/dracut-install" ]]
     then
         mkdir --parents "${_root_dir}/dracut"
-        logging.info 'Download and extract dracut.'
+        logging.info "Download and extract dracut version $dracut_version"
         curl --location "$dracut_resource_url" | tar --extract --gzip \
             --directory "${_root_dir}/dracut" \
             --strip-components 1
-- 
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