ostree-grub-generator: allow adding custom scripts to grub.cfg

This changes allow us to customize grub.cfg without manually editing it. Now, whatever files found under /etc/ostree.d are added (in alphabetical order) between the cfg header and its menuentries, allowing to add custom logic to the bootloader in a non intrusive way. Signed-off-by: Eduardo Ferreira <[email protected]>
ostreedev · Feb 8, 2024 · c9260ff · c9260ff
1 parent da89214
commit c9260ff
Showing 1 changed file with 13 additions and 0 deletions.
diff --git a/src/boot/grub2/ostree-grub-generator b/src/boot/grub2/ostree-grub-generator
@@ -25,6 +25,7 @@ script=$(basename ${0})
 # Atomically safe location where to generete grub.cfg when executing system upgrade.
 new_grub2_cfg=${2}
 entries_path=$(dirname $new_grub2_cfg)/entries
+custom_scripts="/etc/ostree.d"
 
 read_config()
 {
@@ -105,10 +106,22 @@ timeout=10
 EOF
 }
 
+populate_custom_section()
+{
+if [ -d "$custom_scripts" ]; then
+    for script in $(ls -v $custom_scripts/*); do
+        echo -e "\n### BEGIN ${script} ###" >> ${new_grub2_cfg} 
+        cat ${script} >> ${new_grub2_cfg}
+        echo -e "\n### END ${script} ###\n" >> ${new_grub2_cfg}
+    done
+fi
+}
+
 generate_grub2_cfg()
 {
     populate_warning
     populate_header
+    populate_custom_section
     populate_menu
 }