add option --ignore-kernel-modules

Instead of adding modprobe and rmmod, create symlinks to /bin/true to don't produce unnecessary errors. Anyway it's a workaround for following desired behaviour: modprobe tries to insert module only if it's not built into kernel

---
  dracut                   |   10 +++++++++-
  dracut.8                 |    4 ++++
  modules.d/99base/install |   13 ++++++++++---
  3 files changed, 23 insertions(+), 4 deletions(-)

dracut +9 -1

index c22051c..e0c2186 100755
@@ -46,6 +46,10 @@ Creates initial ramdisk images for preloading modules
                          firmwares, separated by :
    --kernel-only         Only install kernel drivers and firmware files
    --no-kernel           Do not install kernel drivers and firmware files
+  --ignore-kernel-modules
+                        Don't try to load modules. It automatically implies
+                        '--no-kernel'. It's assumed that everything needed
+                        is built into kernel.
    --strip               Strip binaries in the initramfs
    --nostrip             Do not strip binaries in the initramfs (default)
    --mdadmconf           Include local /etc/mdadm.conf

@@ -86,6 +90,10 @@ while (($#>  0)); do
  	--fwdir) fw_dir_l="$2"; shift;;
  	--kernel-only) kernel_only="yes"; no_kernel="no";;
  	--no-kernel) kernel_only="no"; no_kernel="yes";;
+    --ignore-kernel-modules) kernel_only="no"; no_kernel="yes"
+        ignore_kmodules="yes"
+        omit_dracutmodules_l+=\ kernel-modules
+        ;;
  	--strip) do_strip_l="yes";;
  	--nostrip) do_strip_l="no";;
          --mdadmconf) mdadmconf_l="yes";;

@@ -228,7 +236,7 @@ chmod 755 "$initdir"
 
  export initdir hookdirs dracutbasedir dracutmodules drivers \
      fw_dir drivers_dir debug beverbose no_kernel kernel_only \
-    add_drivers mdadmconf lvmconf filesystems
+    add_drivers mdadmconf lvmconf filesystems ignore_kmodules
 
  if [[ $kernel_only != yes ]]; then
      # Create some directory structure first

dracut.8 +4 -0

index 3a85cb5..4890357 100644
@@ -52,6 +52,10 @@ only install kernel drivers and firmware files
  .BR \-\-no-kernel
  do not install kernel drivers and firmware files
  .TP
+.BR \-\-ignore-kernel-modules
+don't try to load modules; it automatically implies \fB--no-kernel\fR; it's
+assumed that everything needed is built into kernel
+.TP
  .BR \-\-mdadmconf
  include local /etc/mdadm.conf
  .TP

modules.d/99base/install +10 -3

index 6ba9e7e..9cdb086 100755
@@ -1,6 +1,13 @@
  #!/bin/bash
-dracut_install mount mknod mkdir modprobe pidof sleep chroot \
-    sed ls flock cp mv dmesg rm ln rmmod mkfifo less
+dracut_install mount mknod mkdir pidof sleep chroot sed ls flock cp mv dmesg \
+        rm ln mkfifo less
+if [[ ${ignore_kmodules} = yes ]]; then
+    inst /bin/true
+    ln -s /bin/true "${initdir}"/sbin/modprobe
+    ln -s /bin/true "${initdir}"/sbin/rmmod
+else
+    dracut_install modprobe rmmod
+fi
  if [ ! -e "${initdir}/bin/sh" ]; then
      dracut_install bash
      (ln -s bash "${initdir}/bin/sh" || :)

@@ -18,7 +25,7 @@ if which switch_root>/dev/null 2>&1; then
      dracut_install switch_root
  else
      inst "$moddir/switch_root" "/sbin/switch_root" \
-	|| derror "Failed to install switch_root"
+            || derror "Failed to install switch_root"
  fi
  inst "$moddir/dracut-lib.sh" "/lib/dracut-lib.sh"
  inst_hook cmdline 10 "$moddir/parse-root-opts.sh"