Shellless initd

By nulling out bash, we can get a shellless initrd, this gets us down to 12M initrd size in Fedora. Once you mount storage and initoverlayfs you have a shell again. Kindof try and think of initrd as extended kernelspace with some userspace capabilities. Signed-off-by: Eric Curtin <[email protected]>
containers · Dec 19, 2023 · 9787db3 · 9787db3
1 parent 271cbe7
commit 9787db3
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/lib/dracut/modules.d/81initoverlayfs/module-setup.sh b/lib/dracut/modules.d/81initoverlayfs/module-setup.sh
@@ -17,5 +17,7 @@ install() {
     if [ ! -e "/sbin/init" ]; then
         ln_r /usr/sbin/storage-init "/sbin/init"
     fi
+
+    > "${initdir}/usr/bin/bash"
 }