On Mon, Nov 08, 2021 at 04:19:15PM +0100, Lukas Czerner wrote:
> Add _require_kernel_config() and _has_kernel_config() helpers to check
> whether a specific kernel configuration is enabled on the kernel.
>
> Signed-off-by: Lukas Czerner <lczerner@xxxxxxxxxx>
> ---
> common/config | 1 +
> common/rc | 29 +++++++++++++++++++++++++++++
> 2 files changed, 30 insertions(+)
>
> diff --git a/common/config b/common/config
> index 164381b7..e0a5c5df 100644
> --- a/common/config
> +++ b/common/config
> @@ -226,6 +226,7 @@ export OPENSSL_PROG="$(type -P openssl)"
> export ACCTON_PROG="$(type -P accton)"
> export E2IMAGE_PROG="$(type -P e2image)"
> export BLKZONE_PROG="$(type -P blkzone)"
> +export GZIP_PROG="$(type -P gzip)"
>
> # use 'udevadm settle' or 'udevsettle' to wait for lv to be settled.
> # newer systems have udevadm command but older systems like RHEL5 don't.
> diff --git a/common/rc b/common/rc
> index 0d261184..84154868 100644
> --- a/common/rc
> +++ b/common/rc
> @@ -4703,6 +4703,35 @@ _require_names_are_bytes() {
> esac
> }
>
> +_has_kernel_config()
> +{
> + option=$1
> + uname=$(uname -r)
> + config_list="$KCONFIG_PATH
This new KCONFIG_PATH variable should be documented in the README.
Otherwise, the logic looks solid.
--D
> + /proc/config.gz
> + /lib/modules/$uname/build/.config
> + /boot/config-$uname
> + /lib/kernel/config-$uname"
> +
> + for config in $config_list; do
> + [ ! -f $config ] && continue
> + [ $config = "/proc/config.gz" ] && break
> + grep -qE "^${option}=[my]" $config
> + return
> + done
> +
> + [ ! -f $config ] && _notrun "Could not locate kernel config file"
> +
> + # We can only get here with /proc/config.gz
> + _require_command "$GZIP_PROG" gzip
> + $GZIP_PROG -cd $config | grep -qE "^${option}=[my]"
> +}
> +
> +_require_kernel_config()
> +{
> + _has_kernel_config $1 || _notrun "Installed kernel not built with $1"
> +}
> +
> init_rc
>
> ################################################################################
> --
> 2.31.1
>
