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diff --git a/usr.sbin/freebsd-update/freebsd-update.8 b/usr.sbin/freebsd-update/freebsd-update.8
--- a/usr.sbin/freebsd-update/freebsd-update.8
+++ b/usr.sbin/freebsd-update/freebsd-update.8
@@ -25,7 +25,7 @@
.\"
.\" $FreeBSD$
.\"
-.Dd April 22, 2022
+.Dd August 17, 2022
.Dt FREEBSD-UPDATE 8
.Os
.Sh NAME
@@ -51,7 +51,7 @@
tool is used to fetch, install, and rollback binary
updates to the
.Fx
-base system.
+base system. It can also just check for available updates and exit.
.Sh BINARY UPDATES AVAILABILITY
Binary updates are not available for every single
.Fx
@@ -161,9 +161,18 @@
.Cm command
can be any one of the following:
.Bl -tag -width "rollback"
-.It Cm fetch
-Based on the currently installed world and the configuration
-options set, fetch all available binary updates.
+.It Cm check
+Check for available updates without fetching all available
+binary files. Instead, it only fetches and sanitizes the update
+tag and compares it against the current running version of
+.Fx
+at that time. The
+.Cm check
+command can not be called together with the
+.Cm install
+or
+.Cm upgrade
+commands.
.It Cm cron
Sleep a random amount of time between 1 and 3600 seconds,
then download updates as if the
@@ -179,6 +188,9 @@
the random delay serves to minimize the probability that
a large number of machines will simultaneously attempt to
fetch updates.
+.It Cm fetch
+Based on the currently installed world and the configuration
+options set, fetch all available binary updates.
.It Cm upgrade
Fetch files necessary for upgrading to a new release.
Before using this command, make sure that you read the
@@ -259,4 +271,8 @@
.Xr freebsd-update.conf 5 ,
.Xr nextboot 8
.Sh AUTHORS
-.An Colin Percival Aq Mt cperciva@FreeBSD.org
+.An Colin Percival Aq Mt cperciva@FreeBSD.org .
+The
+.Cm check
+command was implemented and documented by
+.An Vinicius Zavam Aq Mt egypcio@FreeBSD.org .
diff --git a/usr.sbin/freebsd-update/freebsd-update.sh b/usr.sbin/freebsd-update/freebsd-update.sh
--- a/usr.sbin/freebsd-update/freebsd-update.sh
+++ b/usr.sbin/freebsd-update/freebsd-update.sh
@@ -59,9 +59,10 @@
--currently-running release
-- Update as if currently running this release
Commands:
- fetch -- Fetch updates from server
+ check -- Check for available updates only
cron -- Sleep rand(3600) seconds, fetch updates, and send an
email if updates were found
+ fetch -- Fetch updates from server
upgrade -- Fetch upgrades to FreeBSD version specified via -r option
updatesready -- Check if there are fetched updates ready to install
install -- Install downloaded updates or upgrades
@@ -474,6 +475,9 @@
# Fetched first in a chain of commands
ISFETCHED=0
+
+ # Check for available updates
+ CHECK_ONLY=0
}
# Parse the command line
@@ -541,7 +545,7 @@
# Commands
cron | fetch | upgrade | updatesready | install | rollback |\
- IDS | showconfig)
+ IDS | showconfig | check)
COMMANDS="${COMMANDS} $1"
;;
@@ -2186,8 +2190,8 @@
echo ${NOWTIME} > lasteolwarn
}
-# Do the actual work involved in "fetch" / "cron".
-fetch_run () {
+# Preparation before the actual work involved in "fetch" / "cron".
+fetch_run_pre () {
workdir_init || return 1
# Prepare the mirror list.
@@ -2205,6 +2209,14 @@
done
fetch_tagsanity || return 1
+ # Check for available updates
+ [ $CHECK_ONLY -eq 1 ] && check_only
+}
+
+# Do the actual work involved in "fetch" / "cron".
+fetch_run () {
+ fetch_run_pre
+
# Fetch the latest INDEX-NEW and INDEX-OLD files.
fetch_metadata INDEX-NEW INDEX-OLD || return 1
@@ -3023,14 +3035,6 @@
install_from_index INDEX-NEW || return 1
install_delete INDEX-OLD INDEX-NEW || return 1
- # Restart sshd if running (PR263489). Note that this does not
- # affect child sshd processes handling existing sessions.
- if service sshd status >/dev/null 2>/dev/null; then
- echo
- echo "Restarting sshd after upgrade"
- service sshd restart
- fi
-
# Rehash certs if we actually have certctl installed.
if which certctl>/dev/null; then
env DESTDIR=${BASEDIR} certctl rehash
@@ -3371,6 +3375,39 @@
IDS_compare INDEX-ALL INDEX-PRESENT
}
+# Check for available updates
+check_only () {
+ RELPATCHNUM=`cut -f 4 -d '|' < tag.new`
+ RELPX=`uname -r | sed -E 's,.*-,,'`
+ case ${RELPX} in
+ ALPHA* | BETA* | RC*)
+ echo "`basename $0` can not check updates for ALPHA/BETA/RC releases."
+ echo "Those can only be upgraded to a newer release, not patched."
+ exit 1
+ ;;
+ RELEASE)
+ if [ $RELPATCHNUM -ge 1 ]; then
+ echo "There is an update available: $RELNUM-p$RELPATCHNUM"
+ exit 0
+ fi
+ ;;
+ p*)
+ PX=`echo $RELPX | sed 's|p||'`
+ if [ $PX -lt $RELPATCHNUM ]; then
+ echo "There is an update available: $RELNUM-p$RELPATCHNUM"
+ exit 0
+ fi
+ ;;
+ *)
+ echo "`basename $0` can not find reliable updates for `uname -r`"
+ echo "Cowardly refusing to proceed any further."
+ exit 1
+ ;;
+ esac
+ echo "No updates are available."
+ exit 0
+}
+
#### Main functions -- call parameter-handling and core functions
# Using the command line, configuration file, and defaults,
@@ -3393,7 +3430,9 @@
exit 1
fi
fetch_check_params
- fetch_run || exit 1
+ if ( ! `echo $COMMANDS | grep -q check` ) ; then
+ fetch_run || exit 1
+ fi
ISFETCHED=1
}
@@ -3479,6 +3518,16 @@
done
}
+# Check for available updates.
+cmd_check () {
+ if ( ! `echo $COMMANDS | grep -q -E 'install|upgrade'` ) ; then
+ CHECK_ONLY=1
+ fi
+ finalize_components_config ${COMPONENTS}
+ fetch_check_params
+ fetch_run_pre
+}
+
#### Entry point
# Make sure we find utilities from the base system

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