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✏️ Editing: 420_copy_firmware_files.sh

# 420_copy_firmware_files.sh
#
# Copy firmware files to the rescue/recovery system.

# The special value FIRMWARE_FILES=( 'no' ) or any value that
# is recognized as 'no' by the is_false function enforces that
# no files from the /lib*/firmware/ directories get included
# in the rescue/recovery system:
if is_false "$FIRMWARE_FILES" ; then
    LogPrint "Omit copying files in /lib*/firmware/ (FIRMWARE_FILES='$FIRMWARE_FILES')"
    return
fi

# The by default empty FIRMWARE_FILES array means that
# usually all files in the /lib*/firmware/ directories
# get included in the rescue/recovery system but on certain
# architectures like ppc64 or ppc64le FIRMWARE_FILES could be set different
# (cf. the conf/Linux-ppc64.conf and conf/Linux-ppc64le.conf scripts)
# or FIRMWARE_FILES was specified by the user:
test "${FIRMWARE_FILES[*]}" || FIRMWARE_FILES=( 'yes' )

# The special value FIRMWARE_FILES=( 'yes' ) or any value that
# is recognized as 'yes' by the is_true function enforces that
# all files from the /lib*/firmware/ directories get included
# in the rescue/recovery system:
if is_true "$FIRMWARE_FILES" ; then
    LogPrint "Copying all files in /lib*/firmware/"
    # Use a simple 'cp -a' for this case to be safe against possible issues
    # with the more complicated 'find ... | xargs cp' method below.
    # The '--parents' is needed to get the '/lib*/' directory in the copy.
    # It is crucial to append to /dev/$DISPENSABLE_OUTPUT_DEV (cf. 'Print' in lib/_input-output-functions.sh):
    cp $verbose -t $ROOTFS_DIR -a --parents /lib*/firmware 2>>/dev/$DISPENSABLE_OUTPUT_DEV 1>&2
    return
fi

# Finally the more complicated case,
# cf. "Return early, return often" in https://github.com/rear/rear/wiki/Coding-Style
LogPrint "Copying files from /lib*/firmware/ that match ${FIRMWARE_FILES[@]}"
for find_ipath_pattern in "${FIRMWARE_FILES[@]}" ; do
    # No need to test if find_ipath_pattern is empty because 'find' does not find anything with empty '-ipath'.
    # The 'cp --parents' does not copy empty directories which should not matter (a directory without a firmware file is useless) and
    # it may report "cp: omitting directory ..." so that this particular stderr message is filtered out because it is meaningless here
    # and 'cp -L' ensures that when during 'find -ipath' only a symbolic link name matches, the actual firmware file gets copied
    # (note that 'find -L' would not work because it still outputs the symbolic link name).
    # Ignore errors in this complicated case because it is in practice impossible to decide what errors should be fatal.
    # For example when 'find' does not find anything for a find_ipath_pattern 'cp' fails with "cp: missing file operand"
    # and 'grep -v foo' results exit code 1 if 'foo' is in all input lines (i.e. when 'grep -v' results no output):
    find /lib*/firmware -ipath "$find_ipath_pattern" | xargs cp $verbose -t $ROOTFS_DIR -p -L --parents 2>&1 | grep -v 'omitting directory' 1>&2 || true
done

MR SKB