mkosi: Make sure bpf-framework works on CentOS Stream 8 as well

diff --git a/mkosi.build b/mkosi.build
index 7a32673bb48c06a3c7f8aa635a276abf0ed17e5e..f02a15ad4d21a7e1f1ca076d739dc9e8687b00b1 100755 (executable)
--- a/mkosi.build
+++ b/mkosi.build
@@ -56,6 +56,22 @@ for bpftool in /usr/lib/linux-tools/*/bpftool; do
         break
 done
 
+# CentOS Stream 8 includes bpftool 4.18.0 which is lower than what we need. However, they've backported the
+# specific feature we need ("gen skeleton") to this version, so we replace bpftool with a script that reports
+# version 5.6.0 to satisfy meson which makes bpf work on CentOS Stream 8 as well.
+if [ "$(grep '^ID=' /etc/os-release)" = "ID=\"centos\"" ] && [ "$(grep '^VERSION=' /etc/os-release)" = "VERSION=\"8\"" ]; then
+        cp /usr/sbin/bpftool /usr/sbin/bpftool.real
+        cat > /usr/sbin/bpftool <<EOF
+#!/bin/sh
+if [ "\$1" = --version ]; then
+        echo 5.6.0
+else
+        exec /usr/sbin/bpftool.real \$@
+fi
+EOF
+        chmod +x /usr/sbin/bpftool
+fi
+
 if [ ! -f "$BUILDDIR"/build.ninja ] ; then
         sysvinit_path=$(realpath /etc/init.d)