Next fw_update feature is a "list" of devices or firmware.  This might
be useful when downloading firmware for a machine without Internet
access.

For example: 

openbsd-host $ fw_update -F $( ssh host-without-outbound fw_update -l )
openbsd-host $ scp SHA256.sig *.tgz host-without-outbond:/tmp/fw

Or perhaps you are on a host without fw_update, but you have wget or
similar:

linux-host $ wget $( ssh host-without-outbound fw_update -lF )
linux-host $ scp SHA256.sig *.tgz host-without-outbond:/tmp/fw

In either case, you could then use:
host-without-outbound $ fw_update -p /tmp/fw

or 
host-without-outbound $ fw_update /tmp/fw/*.tgz


Comments, questions, OK?


Index: fw_update.8
===================================================================
RCS file: /cvs/src/usr.sbin/fw_update/fw_update.8,v
diff -u -p -r1.5 fw_update.8
--- fw_update.8	4 Nov 2024 00:34:47 -0000	1.5
+++ fw_update.8	4 Nov 2024 18:09:28 -0000
@@ -22,7 +22,7 @@
 .Nd install non-free firmware
 .Sh SYNOPSIS
 .Nm
-.Op Fl adFnv
+.Op Fl adFlnv
 .Op Fl p Ar path
 .Op Ar driver | file ...
 .Sh DESCRIPTION
@@ -59,6 +59,11 @@ If used in conjunction with
 delete firmware for all drivers.
 .It Fl F
 Download SHA256.sig and firmware .tgz to the current directory.
+.It Fl l
+List the detected drivers that need firmware.
+With
+.Fl F
+lists the full path to the files that will be downloaded.
 .It Fl n
 Dry run.
 Do not actually install or update any firmware;
Index: fw_update.sh
===================================================================
RCS file: /cvs/src/usr.sbin/fw_update/fw_update.sh,v
diff -u -p -r1.59 fw_update.sh
--- fw_update.sh	4 Nov 2024 01:24:00 -0000	1.59
+++ fw_update.sh	4 Nov 2024 18:09:28 -0000
@@ -496,12 +496,14 @@ usage() {
 
 ALL=false
 DOWNLOAD_ONLY=false
-while getopts :adFnp:v name
+LIST=false
+while getopts :adFlnp:v name
 do
 	case "$name" in
 	a) ALL=true ;;
 	d) DELETE=true ;;
 	F) DOWNLOAD_ONLY=true ;;
+	l) LIST=true ;;
 	n) DRYRUN=true ;;
 	p) FWURL="$OPTARG" ;;
 	v) ((++VERBOSE)) ;;
@@ -517,6 +519,8 @@ do
 done
 shift $((OPTIND - 1))
 
+"$LIST" && VERBOSE=1
+
 # Progress bars, not spinner When VERBOSE > 1
 ((VERBOSE > 1)) && ENABLE_SPINNER=false
 
@@ -537,7 +541,7 @@ elif [ "$LOCALSRC" ]; then
 fi
 
 if [ -x /usr/bin/id ] && [ "$(/usr/bin/id -u)" != 0 ]; then
-	if "$DOWNLOAD_ONLY"; then
+	if "$DOWNLOAD_ONLY" || "$LIST"; then
 		# When we aren't in the installer,
 		# allow downloading as the current user.
 		DROP_PRIVS=false
@@ -565,6 +569,7 @@ status "${0##*/}:"
 
 if "$DELETE"; then
 	"$DOWNLOAD_ONLY" && warn "Cannot use -F and -d" && usage
+	"$LIST" && warn "Cannot use -l and -d" && usage
 	lock_db
 
 	# Show the "Uninstall" message when just deleting not upgrading
@@ -640,11 +645,19 @@ set -A update ''
 kept=''
 unregister=''
 
+"$LIST" && "$DOWNLOAD_ONLY" &&
+    echo "$FWURL/$( basename "$CFILE" )"
+
 if [ "${devices[*]:-}" ]; then
 	lock_db
 	for f in "${devices[@]}"; do
 		d="$( firmware_devicename "$f" )"
 
+		if "$LIST" && ! "$DOWNLOAD_ONLY"; then
+			echo "$d"
+			continue
+		fi
+
 		verify_existing=true
 		if [ "$f" = "$d" ]; then
 			f=$( firmware_filename "$d" ) || {
@@ -675,6 +688,11 @@ if [ "${devices[*]:-}" ]; then
 			verify_existing=false
 		fi
 
+		if "$LIST"; then
+			echo "$FWURL/$f"
+			continue
+		fi
+
 		set -A installed
 		if "$INSTALL"; then
 			set -A installed -- \
@@ -730,6 +748,12 @@ if [ "${devices[*]:-}" ]; then
 		fi
 
 	done
+fi
+
+if "$LIST"; then
+	# We don't want any status when listing
+	rm -f "$FD_DIR/status"
+	exit
 fi
 
 if "$INSTALL"; then