From: Stuart Henderson <stu@spacehopper.org>
Subject: Re: sysupgrade -c
To: Manuel Giraud <manuel@ledu-giraud.fr>
Cc: tech <tech@openbsd.org>
Date: Fri, 3 Jul 2026 13:01:38 +0100

On 2026/07/03 09:40, Manuel Giraud wrote:
> Hi,
> 
> From a discussion on misc@ some days ago, here's my attempt at
> supporting a "check new version" feature in sysupgrade:
> 
> Index: sysupgrade.8
> ===================================================================
> RCS file: /cvs/src/usr.sbin/sysupgrade/sysupgrade.8,v
> diff -u -p -r1.23 sysupgrade.8
> --- sysupgrade.8	11 Nov 2025 15:18:30 -0000	1.23
> +++ sysupgrade.8	3 Jul 2026 07:33:14 -0000
> @@ -22,7 +22,7 @@
>  .Nd upgrade system to the next release or a new snapshot
>  .Sh SYNOPSIS
>  .Nm
> -.Op Fl fkns
> +.Op Fl cfkns
>  .Op Fl b Ar base-directory
>  .Op Fl R Ar version
>  .Op Ar installurl | path
> @@ -54,6 +54,9 @@ Download files to
>  .Ar base-directory Ns / Ns Pa _sysupgrade
>  instead of
>  .Pa /home/_sysupgrade .
> +.It Fl c
> +Print availability of a new version.
> +The sets are not downloaded.
>  .It Fl f
>  For snapshots, force an already applied upgrade.
>  This option has no effect on releases.
> Index: sysupgrade.sh
> ===================================================================
> RCS file: /cvs/src/usr.sbin/sysupgrade/sysupgrade.sh,v
> diff -u -p -r1.62 sysupgrade.sh
> --- sysupgrade.sh	21 Mar 2026 01:34:25 -0000	1.62
> +++ sysupgrade.sh	3 Jul 2026 07:33:14 -0000
> @@ -74,6 +74,7 @@ rmel() {
>  
>  SNAP=false
>  FILE=false
> +CHECK=false
>  FORCE=false
>  FORCE_VERSION=false
>  KEEP=false
> @@ -83,9 +84,10 @@ WHAT='release'
>  VERSION=$(uname -r)
>  NEXT_VERSION=$(echo ${VERSION} + 0.1 | bc)
>  
> -while getopts b:fknrR:s arg; do
> +while getopts b:cfknrR:s arg; do
>  	case ${arg} in
>  	b)	SETSDIR=${OPTARG}/_sysupgrade;;
> +	c)	CHECK=true;;
>  	f)	FORCE=true;;
>  	k)	KEEP=true;;
>  	n)	REBOOT=false;;
> @@ -186,10 +188,22 @@ unpriv cksum -qC SHA256 BUILDINFO
>  if [[ -e /var/db/installed.BUILDINFO ]]; then
>  	installed_build_ts=$(cut -f3 -d' ' /var/db/installed.BUILDINFO)
>  	build_ts=$(cut -f3 -d' ' BUILDINFO)
> -	if (( $build_ts <= $installed_build_ts )) && ! $FORCE; then
> +	if $CHECK; then
> +	    build_human_ts=$(cut -f5- -d' ' BUILDINFO)
> +	    if (( $build_ts > $installed_build_ts )); then
> +		echo "A new version ($build_human_ts) is available."
> +		exit 0
> +	    else
> +		echo "No new version available."

I'd recommend no new version -> no output (like syspatch -c does),
so it can be used in cron without an extra | grep -v.

> +		exit 0
> +	    fi
> +	elif (( $build_ts <= $installed_build_ts )) && ! $FORCE; then
>  		echo "Downloaded ${WHAT} is older than installed system. Use -f to force downgrade."
>  		exit 1
>  	fi
> +elif $CHECK; then
> +    echo "Cannot find installed version."
> +    exit 1
>  fi
>  
>  # INSTALL.*, bsd*, *.tgz
> 
> -- 
> Manuel Giraud
>