feat(dracut): add option to disable automatic guessing of output file

This patch allows forcing the input of the file path for the generated initramfs
image (disabling automatic guessing of the location) using a new command line
option `--force-output-file`, or setting `force_output_file=yes` via
configuration file.

dracut.sh

@@ -79,6 +79,9 @@ Creates initial ramdisk images for preloading modules
 
   --kver [VERSION]      Set kernel version to [VERSION].
   -f, --force           Overwrite existing initramfs file.
+  --force-output-file   Require to specify a file path for the generated
+                         initramfs image, disabling automatic guessing of the
+                         location.
   [OUTPUT_FILE] --rebuild
                         Append the current arguments to those with which the
                          input initramfs image was built. This option helps in
@@ -405,6 +408,7 @@ rearrange_params() {
             --long prefix: \
             --long rebuild: \
             --long force \
+            --long force-output-file \
             --long kernel-only \
             --long no-kernel \
             --long print-cmdline \
@@ -714,6 +718,9 @@ while :; do
             shift
             ;;
         -f | --force) force=yes ;;
+        --force-output-file)
+            force_output_file_l="yes"
+            ;;
         --kernel-only)
             kernel_only="yes"
             no_kernel="no"
@@ -936,6 +943,15 @@ for f in $(dropindirs_sort ".conf" "$confdir" "$dracutbasedir/dracut.conf.d"); d
     [[ -e $f ]] && . "$f"
 done
 
+# check if automatic guessing of the output file is disabled.
+[[ $force_output_file_l ]] && force_output_file=$force_output_file_l
+[[ $force_output_file ]] || force_output_file=no
+if [[ $force_output_file == "yes" && -z $outfile ]]; then
+    printf "%s\n" "dracut[F]: dracut is called with --force-output-file or configured with force_output_file=yes" >&2
+    printf "%s\n" "dracut[F]: so it is required to specify the file path of the generated initramfs image." >&2
+    exit 1
+fi
+
 # regenerate_all shouldn't be set in conf files
 regenerate_all=$regenerate_all_l
 if [[ $parallel_l == "yes" ]]; then

man/dracut.8.asc

@@ -62,6 +62,10 @@ OPTIONS
 **-f, --force**::
     Overwrite existing initramfs file.
 
+**--force-output-file**::
+    Require to specify a file path for the generated initramfs image, disabling
+    automatic guessing of the location.
+
 _<output file>_ **--rebuild**::
     Append the current arguments to those with which the input initramfs image
     was built. This option helps in incrementally building the initramfs for

man/dracut.conf.5.asc

@@ -315,6 +315,10 @@ Logging levels:
    If set to _yes_, try to execute tasks in parallel (currently only supported
    for _--regenerate-all_).
 
+*force_output_file=*"__{yes|no}__"::
+   If set to _yes_, require to specify a file path for the generated initramfs
+   image, disabling automatic guessing of the location (default=no).
+
 Files
 -----
 _/etc/dracut.conf_::

shell-completion/bash/dracut

@@ -36,7 +36,7 @@ _dracut() {
             --enhanced-cpio --rebuild --aggressive-strip --hostonly-cmdline
             --no-hostonly-cmdline --no-hostonly-default-device --nofscks
             --hostonly-i18n --no-hostonly-i18n --lzo --lz4 --no-reproducible
-            --no-uefi --no-machineid --version --parallel
+            --no-uefi --no-machineid --version --parallel --force-output-file
             '
         [ARG]='-a -m -o -d -I -k -c -L -r -i
             --kver --add --force-add --add-drivers --force-drivers