Add new modprobe element

This element will replace modprobe-blacklist element. It wil
still have the blacklist functionality, but it also adds
the feature of passing a complete file with settings to the
modprobe.d directory. Adding this functionality, that will
allow elements that depends on this module, to just copy the
specified files to the final directory.

Change-Id: I9a44f7d11520b8b1e604956d3c1db2fc7e2bf457

diskimage_builder/elements/modprobe-blacklist/README.rst

@@ -10,3 +10,7 @@ to a list of string separated by spaces.
 Example:
 
   export DIB_MODPROBE_BLACKLIST="igb"
+
+.. note::
+   This element has been deprecated and replaced by the modprobe element, that
+   covers 100% the modprobe-blacklist functionality.

diskimage_builder/elements/modprobe/README.rst

@@ -0,0 +1,21 @@
+========
+modprobe
+========
+
+Allows to configure specific modprobe options on the image.
+
+It contains the following functionalities:
+
+1. Ability to blacklist specific modules using modprobe.d/blacklist.conf.
+   In order to use set DIB_MODPROBE_BLACKLIST to the name of your
+   module. To disable multiple modules you can set DIB_MODPROBE_BLACKLIST
+   to a list of string separated by spaces.
+
+   Example:
+
+     export DIB_MODPROBE_BLACKLIST="igb"
+
+2. Ability to copy specific files into /etc/modprobe.d directory, so it
+   allows to configure settings with freedom. To achieve that, the files
+   to be copied needs to be placed inside an specific modprobe.d directory
+   of the element.

diskimage_builder/elements/modprobe/extra-data.d/50-modprobe-blacklist

@@ -0,0 +1,20 @@
+#!/bin/bash
+
+if [ ${DIB_DEBUG_TRACE:-1} -gt 0 ]; then
+    set -x
+fi
+set -eu
+set -o pipefail
+
+# copy all modprobe.d snippets to /etc/modprobe.d
+
+eval declare -A image_elements=($(get_image_element_array))
+
+for i in "${!image_elements[@]}"; do
+    element=$i
+    element_dir=${image_elements[$i]}
+
+    if [ -d "${element_dir}/modprobe.d/" ]; then
+        sudo cp ${element_dir}/modprobe.d/*.conf $TMP_MOUNT_PATH/etc/modprobe.d/
+    fi
+done

diskimage_builder/elements/modprobe/install.d/80-modprobe-blacklist

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+if [ ${DIB_DEBUG_TRACE:-1} -gt 0 ]; then
+    set -x
+fi
+set -eu
+set -o pipefail
+
+MODULES_LIST=${DIB_MODPROBE_BLACKLIST:?"Please set DIB_MODPROBE_BLACKLIST."}
+
+for mod_name in $MODULES_LIST; do
+    echo "blacklist $mod_name" >> /etc/modprobe.d/blacklist.conf
+done

releasenotes/notes/add-modprobe-element-8e3b0287ebb11920.yaml

@@ -0,0 +1,10 @@
+---
+features:
+  - Add new modprobe element. This element will replace
+    modprobe-blacklist element. It wil still have the
+    blacklist functionality, but it also adds the feature
+    of passing a complete file with settings to the
+    modprobe.d directory. Adding this functionality, that
+    will allow elements that depends on this module, to
+    just copy the specified files to the final directory.
+