.\" SPDX-License-Identifier: AGPL-3.0-or-later
.\" Copyright (c) 2020-2021 Red Hat GmbH
.\" Author: Stefano Brivio <email@example.com>
.TH qrap 1
\- qemu wrapper connecting UNIX domain socket to file descriptor
[\fIFDNUM\fR \fIQEMU_CMD\fR] [\fIQEMU_ARG\fR]...
\fBqrap\fR is a wrapper, designed specifically for usage with \fBqemu\fR(1) and
\fBpasst\fR(1), connecting a UNIX domain socket to a file descriptor, and
running \fBqemu\fR(1) with given arguments.
A running instance of \fBpasst\fR(1) is probed checking for UNIX domain sockets,
answering a dummy ARP request, with names starting from
\fI/tmp/passt_1.socket\fR up to \fI/tmp/passt_64.socket\fR.
If first and second arguments are not a socket number and a command, that is,
respectively, \fIFDNUM\fR and \fIQEMU_CMD\fR, \fBqrap\fR will try to locate a
qemu executable in \fBPATH\fR and patch the command line to specify a network
device and a \fInetdev\fR back-end for usage with \fBpasst\fR(1).
If \fBqrap\fR patches the command line, it will remove any potentially
conflicting network device, that is, any \fI-netdev\fR or \fI-net\fR option, or
any \fI-device\fR option with argument starting with \fIvirtio-net-pci,\fR,
\fIvirtio-net-ccw,\fR, \fIe1000,\fR, \fIe1000e,\fR, or \fIrtl8139,\fR.
.BR "Start qemu explicitly passing its command name and a socket number"
$ ./qrap 5 kvm test.qcow2 -m 1024 -display none -nodefaults -nographic -net socket,fd=5 -net nic,model=virtio
.BR "Start qemu without command name and socket number, patching arguments"
$ ./qrap test.qcow2 -m 1024 -display none -nodefaults -nographic
This wrapper is temporary and needed only as long as \fBqemu\fR(1) does not
directly support a UNIX domain socket as \fInetdev\fR back-end.
Out-of-tree patches for \fBqemu\fR(1) introducing support for a UNIX domain
socket back-end are available at:
Stefano Brivio <firstname.lastname@example.org>
.SH REPORTING BUGS
No public bug tracker is available at this time. For the moment being, report
issues to Stefano Brivio <email@example.com>.
Copyright (c) 2020-2021 Red Hat GmbH.
\fBqrap\fR is free software: you can redistribute is and/or modify it under the
terms of the GNU Affero General Public License as published by the Free Software
Foundation, either version 3 of the License, or (at your option) any later
.SH SEE ALSO
High-level documentation is available at https://passt.top/passt/about/.