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Date:      Sun, 10 Jan 2021 19:11:59 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 252554] dumpon doesn't work with -z or -Z options?
Message-ID:  <bug-252554-227-TrcUdtVynZ@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-252554-227@https.bugs.freebsd.org/bugzilla/>
References:  <bug-252554-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D252554

--- Comment #4 from Ed Maste <emaste@freebsd.org> ---
Something like (completely untested):

+       if (error =3D=3D EINVAL && netdump && (gzip || zstd)) {
+               /* Retry w/o compression in case kernel lacks support. */
+               kdap->kda_compression =3D KERNELDUMP_COMP_NONE;
+               error =3D ioctl(fd, DIOCSKERNELDUMP, kdap);
+               if (error =3D=3D 0) {
+                       warnx("Compression disabled; kernel may lack gzip o=
r "
+                           "zstd support.");
+               } else {
+                       error =3D errno;
+               }
+       }

--=20
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