Allow configuration of paths to prune

Without this, it makes it impossible to install/use software that
depends on this path being available, such as any application which
wants to log to its own dir in /var/log.

Change-Id: Ie6d6efa7cf7de1dc9cd63031de05f95b2d050935

dib/ironic-ramdisk-base/cleanup.d/99-ramdisk-create

@@ -19,36 +19,27 @@ IMAGE_PATH=$(readlink -f $IMAGE_NAME)
 cd $TARGET_ROOT
 
 DIB_IPA_COMPRESS_CMD="${DIB_IPA_COMPRESS_CMD:-gzip}"
+DIB_IPA_PATHS_TO_PRUNE="${DIB_IPA_PATHS_TO_PRUNE:-'./sys/*' './tmp/*' \
+    './boot/*' './root/.cache' '*site-packages/babel/locale-data/*' \
+    './usr/include/*' './usr/lib/locale/*' './usr/share/doc/*' \
+    './usr/share/man/*' './usr/share/GeoIP/*' './usr/share/info/*' \
+    './usr/share/licenses/*' './usr/share/locale/*' './usr/share/misc/m*' \
+    './usr/src/kernels/*' './var/cache/*' './var/log/*'}"
 
 echo "#disabled" > ./tmp/fstab.new
 sudo mv ./tmp/fstab.new ./etc/fstab
 sudo ln -s ./sbin/init ./
 
-# Note: The pci.ids, which is used by lshw, locate on Ubuntu
-# in /usr/share/misc. Therefore we are removing only the
-# ./usr/share/misc/m* (will remove the magic and magic.mgc files).
-# on RHEL pci.ids is locate on /usr/share/hwdata/pci.ids.
-sudo find . -xdev \
-    -path './sys/*' -prune -o \
-    -path './tmp/*' -prune -o \
-    -path './boot/*' -prune -o \
-    -path './root/.cache' -prune -o \
-    -path "*site-packages/babel/locale-data/*" -prune -o \
-    -path './usr/include/*' -prune -o \
-    -path './usr/lib/locale/*' -prune -o \
-    -path './usr/share/doc/*' -prune -o \
-    -path './usr/share/man/*' -prune -o \
-    -path './usr/share/GeoIP/*' -prune -o \
-    -path './usr/share/info/*' -prune -o \
-    -path './usr/share/licenses/*' -prune -o \
-    -path './usr/share/locale/*' -prune -o \
-    -path './usr/share/misc/m*' -prune -o \
-    -path './usr/src/kernels/*' -prune -o \
-    -path './var/cache/*' -prune -o \
-    -path './var/log/*' -prune -o \
-    -name '*.pyc' -prune -o \
-    -name '*.pyo' -prune -o \
-    -print | sudo cpio -o -H newc | ${DIB_IPA_COMPRESS_CMD} > ${IMAGE_PATH}.initramfs
+# Build up the command to find files to add to initramfs
+# using configurable list of paths to prune
+FIND_COMMAND="find . -xdev "
+for path in $DIB_IPA_PATHS_TO_PRUNE; do
+    FIND_COMMAND="$FIND_COMMAND -path $path -prune -o "
+done
+FIND_COMMAND="$FIND_COMMAND -name '*.pyc' -prune -o "
+FIND_COMMAND="$FIND_COMMAND -name '*.pyo' -prune -o -print "
+
+sudo $FIND_COMMAND | sudo cpio -o -H newc | ${DIB_IPA_COMPRESS_CMD} > ${IMAGE_PATH}.initramfs
 
 select_boot_kernel_initrd $TARGET_ROOT
 sudo cp $BOOTDIR/$KERNEL ${IMAGE_PATH}.kernel