Here is a change to be used for testing changes to patterns.c.  The idea
is that if you are modifying the patterns you want to know what they
match.  Since I just committed support for listing with -l (although you
could have used dry-run) it would work something like this.

$ cd /usr/src/usr.sbin/fw_update
$ make firmware_patterns
$ ksh ./fw_update.sh -l

However, sometimes your development machine isn't the same as the one
you are adding firmware for.  Or maybe you are testing the dmesg from
the installer, but getting that dmesg is left as an exercise for the
reader.

$ # assuming we've done the steps above
$ scp weird-machine:/var/run/dmesg.boot dmesg
$ ksh ./fw_update.sh -l


Comments, questions, OK?

How should I document this? A comment in patterns.c? Something else?

Should I use flags ("-D /path/to/dmesg" and "-P /path/to/patterns")
instead of just doing it?


--- fw_update.sh.1.61	Fri Nov  8 18:49:56 2024
+++ fw_update.sh	Fri Nov  8 18:57:17 2024
@@ -20,15 +20,26 @@
 export PATH=/usr/bin:/bin:/usr/sbin:/sbin
 
 CFILE=SHA256.sig
+DMESG=/var/run/dmesg.boot
 DESTDIR=${DESTDIR:-}
 FWPATTERNS="${DESTDIR}/usr/share/misc/firmware_patterns"
 
 VNAME=${VNAME:-$(sysctl -n kern.osrelease)}
 VERSION=${VERSION:-"${VNAME%.*}${VNAME#*.}"}
 
+if [ "${0##*/}" = fw_update.sh ] && [ -e firmware_patterns ]; then
+	FWPATTERNS=$PWD/firmware_patterns
+	echo "Using patterns from $FWPATTERNS" >&2
+
+	if [ -e dmesg ]; then
+		DMESG=$PWD/dmesg
+		echo "Using dmesg from $DMESG" >&2
+	fi
+fi
+
 HTTP_FWDIR="$VNAME"
 VTYPE=$( sed -n "/^OpenBSD $VNAME\([^ ]*\).*$/s//\1/p" \
-    /var/run/dmesg.boot | sed '$!d' )
+    "$DMESG" | sed '$!d' )
 [ "$VTYPE" = -current ] && HTTP_FWDIR=snapshots
 
 FWURL=http://firmware.openbsd.org/firmware/${HTTP_FWDIR}
@@ -251,7 +262,7 @@
 '
 
 	# The dmesg can contain multiple boots, only look in the last one
-	_dmesgtail="$( echo ; sed -n 'H;/^OpenBSD/h;${g;p;}' /var/run/dmesg.boot )"
+	_dmesgtail="$( echo ; sed -n 'H;/^OpenBSD/h;${g;p;}' "$DMESG" )"
 
 	grep -v '^[[:space:]]*#' "$FWPATTERNS" |
 	    while read -r _d _m; do