[make-initrd] [PATCH v6 08/22] bootchain-waitdev: introduces an optional waitdev_timeout

[Alexey Gladkov]

On Sun, Oct 24, 2021 at 08:21:08PM +0300, Leonid Krivoshein wrote:
> "waitdev_timeout" describes a common timeout for all "waitdev" steps
> in the "bootchain". Defining a timeout allows to use a fallback if
> the specified devices are not ready yet. By default is not set, which
> makes to wait forever.
> 
> Signed-off-by: Leonid Krivoshein <klark.devel at gmail.com>
> ---
>  features/bootchain-waitdev/README.md           |  3 +++
>  .../etc/initrd/cmdline.d/bootchain-waitdev     |  1 +
>  .../data/lib/bootchain/waitdev                 | 18 ++++++++++++++++++
>  .../data/lib/initrd/pre/bootchain/300-waitdev  |  3 +++
>  4 files changed, 25 insertions(+)
> 
> diff --git a/features/bootchain-waitdev/README.md b/features/bootchain-waitdev/README.md
> index 126a904..d6bae63 100644
> --- a/features/bootchain-waitdev/README.md
> +++ b/features/bootchain-waitdev/README.md
> @@ -13,6 +13,9 @@ feature. It allows to wait a specified block or character special devices.
>     the same as `root=`, but with optional `CDROM:` prefix. This parameter can be
>     specified more than once depending on how many times a corresponding element
>     is mentioned in the `bootchain`.
> +- `waitdev_timeout` describes a common timeout for all `waitdev` steps in the
> +  `bootchain`. Defining a timeout allows to use a fallback if the specified
> +  devices are not ready yet. By default is not set, which makes to wait forever.

Почему он общий между всеми waitdev ???

Получается, если первый waitdev прождал весь wait_timeout, то остальные
даже пробовать не будут, но это же неправильно так как они другой девайс
ожидают.

Например, мы ждём сначала cdrom, а потом usb-флешку с ключом.

>  ## Example
>  
> diff --git a/features/bootchain-waitdev/data/etc/initrd/cmdline.d/bootchain-waitdev b/features/bootchain-waitdev/data/etc/initrd/cmdline.d/bootchain-waitdev
> index 3544c25..6929a86 100644
> --- a/features/bootchain-waitdev/data/etc/initrd/cmdline.d/bootchain-waitdev
> +++ b/features/bootchain-waitdev/data/etc/initrd/cmdline.d/bootchain-waitdev
> @@ -1 +1,2 @@
>  register_array string WAITDEV
> +register_parameter number WAITDEV_TIMEOUT
> diff --git a/features/bootchain-waitdev/data/lib/bootchain/waitdev b/features/bootchain-waitdev/data/lib/bootchain/waitdev
> index 60464d9..fa99c45 100755
> --- a/features/bootchain-waitdev/data/lib/bootchain/waitdev
> +++ b/features/bootchain-waitdev/data/lib/bootchain/waitdev
> @@ -3,6 +3,14 @@
>  . bootchain-sh-functions
>  
>  check_parameter WAITDEV
> +
> +timeout=
> +timecnt=/.initrd/bootchain/waitdev/TIMECNT
> +
> +[ ! -s "$timecnt" ] ||
> +	read -r timeout < "$timecnt" ||:
> +[ "$timeout" != 0 ] ||
> +	exit 0
>  devspec="$(get_parameter WAITDEV)"
>  
>  while [ -n "$devspec" ]; do
> @@ -25,4 +33,14 @@ while [ -n "$devspec" ]; do
>  	fi
>  
>  	sleep 1
> +	[ -n "$timeout" ] ||
> +		continue
> +	timeout=$(($timeout - 1))
> +
> +	if [ "$timeout" = 0 ]; then
> +		message "device waiting timeout exceedded"
> +		break
> +	fi
>  done
> +
> +[ -z "$timeout" ] || printf '%s\n' "$timeout" > "$timecnt"
> diff --git a/features/bootchain-waitdev/data/lib/initrd/pre/bootchain/300-waitdev b/features/bootchain-waitdev/data/lib/initrd/pre/bootchain/300-waitdev
> index 3642722..5e0f040 100755
> --- a/features/bootchain-waitdev/data/lib/initrd/pre/bootchain/300-waitdev
> +++ b/features/bootchain-waitdev/data/lib/initrd/pre/bootchain/300-waitdev
> @@ -5,6 +5,9 @@
>  dir=/.initrd/bootchain/waitdev
>  mkdir -p -- "$dir"
>  
> +[ -z "${WAITDEV_TIMEOUT-}" ] ||
> +	printf '%s\n' "$WAITDEV_TIMEOUT" >"$dir"/TIMECNT
> +
>  i=0
>  while [ "$i" -lt "${WAITDEV:-0}" ]; do
>  	touch "$dir/$i"
> -- 
> 2.24.1
> 
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-- 
Rgrds, legion