fix(dracut.sh): handle '-i' option to include files beginning with '.'

While including a directory using '--include' option, the file and
subdirectory names that begin with '.' are not included. Also, dracut
throws a warning message when a subdirectory is empty or only has
files or subdirectories that begin with '.'.

For example, while trying to include /tmpdata directory with the
below tree:

  # tree -a /tmpdata
  /tmpdata
  ├── .anothertestdir
  ├── testdir
  │   └── .testsubdir
  └── .testfile

dracut throws the below warning message:

  # dracut --include /tmpdata /root
  cp: cannot stat '/tmpdata/testdir/*': No such file or directory
  #

and this is how the included /tmpdata directory tree looks:

  # tree -a root
  root
  └── testdir

No file or directory beginning with '.' is included & also, copying
/tmpdata/testdir reported "No such file or directory" warning. Using
'.' instead of '*' in the below command will fix the warning whether
the directory being copied is empty or only has files or directories
that begin with dot:

  $DRACUT_CP -t "$object_destdir" "$dracutsysrootdir$objectname"/*

Also, enable 'dotglob' temporarily to include files and directories
beginning with a `.' in the results of pathname expansion of source
directory being included.

Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>

dracut.sh

@@ -2067,6 +2067,8 @@ for ((i = 0; i < ${#include_src[@]}; i++)); do
             # check for preexisting symlinks, so we can cope with the
             # symlinks to $prefix
             # Objectname is a file or a directory
+            reset_dotglob="$(shopt -p dotglob)"
+            shopt -q -s dotglob
             for objectname in "$src"/*; do
                 [[ -e $objectname || -L $objectname ]] || continue
                 if [[ -d $objectname ]]; then
@@ -2077,11 +2079,12 @@ for ((i = 0; i < ${#include_src[@]}; i++)); do
                         mkdir -m 0755 -p "$object_destdir"
                         chmod --reference="$objectname" "$object_destdir"
                     fi
-                    $DRACUT_CP -t "$object_destdir" "$dracutsysrootdir$objectname"/*
+                    $DRACUT_CP -t "$object_destdir" "$dracutsysrootdir$objectname"/.
                 else
                     $DRACUT_CP -t "$destdir" "$dracutsysrootdir$objectname"
                 fi
             done
+            eval "$reset_dotglob"
         elif [[ -e $src ]]; then
             derror "$src is neither a directory nor a regular file"
         else