From bash manpage, FUNCNAME exists only inside functions. When in debug
mode, make sure to use an empty default value as FUNCNAME[0] when
outside of functions.
With bash4 this wasn't an issue, but is with bash5 with hardening option
'set -u' used, as shown in the example below:
Incorrect:
$ bash -u -c 'echo -n ${FUNCNAME[0]}'
bash: line 1: FUNCNAME[0]: unbound variable
$
Correct:
$ bash -u -c 'echo -n ${FUNCNAME[0]-}'
$
This hardening enables sourcing dracut-lib.sh from external utilities
executing in the initramfs such as clevis-luks-askpass, which uses
hardening option 'set -u' internally.
(see Clevis PR https://github.com/latchset/clevis/pull/340)
Signed-off-by: Renaud Métrich <rmetrich@redhat.com>
export DRACUT_LOG_LEVEL=warning
[[ $debug ]] && {
export DRACUT_LOG_LEVEL=debug
- export PS4='${BASH_SOURCE}@${LINENO}(${FUNCNAME[0]}): '
+ export PS4='${BASH_SOURCE}@${LINENO}(${FUNCNAME[0]-}): '
set -x
}
if getargbool 0 rd.debug -d -y rdinitdebug -d -y rdnetdebug; then
RD_DEBUG=yes
[ -n "$BASH" ] \
- && export PS4='${BASH_SOURCE}@${LINENO}(${FUNCNAME[0]}): '
+ && export PS4='${BASH_SOURCE}@${LINENO}(${FUNCNAME[0]-}): '
fi
fi
export RD_DEBUG