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.\" Generated by scdoc 1.11.2
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.\" Complete documentation for this program is not available as a GNU info page
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.ie \n(.g .ds Aq \(aq
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.el .ds Aq '
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.nh
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.ad l
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.\" Begin generated content:
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.TH "waypipe" "1" "2022-04-05"
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.P
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.SH NAME
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.P
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waypipe - A transparent proxy for Wayland applications
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.P
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.SH SYNOPSIS
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.P
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\fBwaypipe\fR [options.\&.\&.\&] \fBssh\fR [ssh options] \fIdestination\fR \fIcommand.\&.\&.\&\fR
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.P
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\fBwaypipe\fR [options.\&.\&.\&] \fBclient\fR
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.br
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\fBwaypipe\fR [options.\&.\&.\&] \fBserver\fR -- \fIcommand.\&.\&.\&\fR
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.br
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\fBwaypipe\fR \fBrecon\fR \fIcontrol_pipe\fR \fInew_socket_path\fR
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.br
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\fBwaypipe\fR \fBbench\fR \fIbandwidth\fR
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.br
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\fBwaypipe\fR [\fB--version\fR] [\fB-h\fR, \fB--help\fR]
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.P
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[options.\&.\&.\&] = [\fB-c\fR, \fB--compress\fR C] [\fB-d\fR, \fB--debug\fR] [\fB-n\fR, \fB--no-gpu\fR] [\fB-o\fR, \fB--oneshot\fR] [\fB-s\fR, \fB--socket\fR S] [\fB--allow-tiled\fR] [\fB--control\fR C] [\fB--display\fR D] [\fB--drm-node\fR R] [\fB--remote-node\fR R] [\fB--remote-bin\fR R] [\fB--login-shell\fR] [\fB--threads\fR T] [\fB--unlink-socket\fR] [\fB--video\fR[=V]]
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.P
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.P
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.SH DESCRIPTION
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.P
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Waypipe is a proxy for Wayland clients, with the aim of supporting behavior
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like \fBssh -X\fR.\&
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.P
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Prefixing an \fBssh .\&.\&.\&\fR command to become \fBwaypipe ssh .\&.\&.\&\fR will automatically
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run \fBwaypipe\fR both locally and remotely, and modify the ssh command to set up
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forwarding between the two instances of \fBwaypipe\fR.\& The remote instance
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will act like a Wayland compositor, letting Wayland applications that are
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run remotely be displayed locally.\&
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.P
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When run as \fBwaypipe client\fR, it will open a socket (by default at
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\fI/tmp/waypipe-client.\&sock\fR) and will connect to the local Wayland compositor
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and forward all Wayland applications which were linked to it over the socket
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by a matching \fBwaypipe server\fR instance.\&
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.P
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When run as \fBwaypipe server\fR, it will run the command that follows in its
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command line invocation, set up its own Wayland compositor socket, and
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try to connect to its matching \fBwaypipe client\fR socket (by default
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\fI/tmp/waypipe-server.\&sock\fR) and try to forward all the Wayland clients
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that connect to fake compositor socket to the matching \fBwaypipe client\fR.\&
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.P
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The \fBwaypipe recon\fR mode is used to reconnect a \fBwaypipe server\fR instance
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which has had a control pipe (option \fB--control\fR) set.\& The new socket path
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should indicate a Unix socket whose connections are forwarded to the \fBwaypipe
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client\fR that the \fBwaypipe server\fR was initially connected to.\&
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.P
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The \fBwaypipe bench\fR mode can be used to estimate, given a specific
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connection \fIbandwidth\fR in MB/sec, which compression options produce the
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lowest latency.\& It tests two synthetic images, one made to be roughly as
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compressible as images containing text, and one made to be roughly as
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compressible as images containing pictures.\&
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.P
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.SH OPTIONS
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.P
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\fB-c C, --compress C\fR
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.RS 4
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Select the compression method applied to data transfers.\& Options are
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\fInone\fR (for high-bandwidth networks), \fIlz4\fR (intermediate), \fIzstd\fR
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(slow connection).\& The default compression is \fInone\fR.\&† The compression
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level can be chosen by appending = followed by a number.\& For example,
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if \fBC\fR is \fIzstd=7\fR, waypipe will use level 7 Zstd compression.\&
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.P
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† In a future version, the default will change to \fIlz4\fR.\&
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.P
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.RE
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\fB-d, --debug\fR
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.RS 4
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Print debug log messages.\&
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.P
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.RE
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\fB-h, --help\fR
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.RS 4
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Show help message and quit.\&
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.P
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.RE
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\fB-n, --no-gpu\fR
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.RS 4
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Block protocols like wayland-drm and linux-dmabuf which require access
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to e.\&g.\& render nodes.\&
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.P
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.RE
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\fB-o, --oneshot\fR
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.RS 4
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Only permit a single connection, and exit when it is closed.\&
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.P
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.RE
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\fB-s S, --socket S\fR
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.RS 4
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Use \fBS\fR as the path for the Unix socket.\& The default socket path for
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server mode is \fI/tmp/waypipe-server.\&sock\fR; for client mode, it is
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\fI/tmp/waypipe-client.\&sock\fR; and in ssh mode, \fBS\fR gives the prefix used by
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both the client and the server for their socket paths.\&
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.P
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.RE
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\fB--version\fR
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.RS 4
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Briefly describe Waypipe'\&s version and the features it was built with,
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then quit.\& Possible features: LZ4 compression support, ZSTD compression
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support, ability to transfer DMABUFs, video compression support, VAAPI
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hardware video de/encoding support.\&
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.P
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.RE
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\fB--allow-tiled\fR
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.RS 4
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By default, waypipe filters out all advertised DMABUF formats which have
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format layout modifiers, as CPU access to these formats may be very slow.\&
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Setting this flag disables the filtering.\& Since tiled images often permit
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faster GPU operations, most OpenGL applications will select tiling modifiers
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when they are available.\&
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.P
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.RE
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\fB--control C\fR
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.RS 4
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For server or ssh mode, provide the path to the "control pipe" that will
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be created the the server.\& Writing (with \fBwaypipe recon C T\fR, or
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\&'\&echo -n T > C'\&) a new socket path to this pipe will make the server
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instance replace all running connections with connections to the new
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Unix socket.\& The new socket should ultimately forward data to the same
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waypipe client that the server was connected to before.\&
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.P
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.RE
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\fB--display D\fR
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.RS 4
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For server or ssh mode, provide \fIWAYLAND_DISPLAY\fR and let waypipe configure
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its Wayland display socket to have a matching path.\& (If \fBD\fR is not an
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absolute path, the socket will be created in the folder given by the
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environment variable \fIXDG_RUNTIME_DIR\fR.\&)
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.P
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.RE
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\fB--drm-node R\fR
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.RS 4
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Specify the path \fBR\fR to the drm device that this instance of waypipe should
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use and (in server mode) notify connecting applications about.\&
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.P
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.RE
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\fB--remote-node R\fR
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.RS 4
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In ssh mode, specify the path \fBR\fR to the drm device that the remote instance
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of waypipe (running in server mode) should use.\&
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.P
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.RE
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\fB--remote-bin R\fR
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.RS 4
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In ssh mode, specify the path \fBR\fR to the waypipe binary on the remote
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computer, or its name if it is available in \fIPATH\fR.\& It defaults to
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\fBwaypipe\fR if this option isn’t passed.\&
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.P
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.RE
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\fB--login-shell\fR
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.RS 4
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Only for server mode; if no command is being run, open a login shell.\&
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.P
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.RE
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\fB--threads T\fR
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.RS 4
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Set the number of total threads (including the main thread) which a \fBwaypipe\fR
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instance will create.\& These threads will be used to parallelize compression
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operations.\& This flag is passed on to \fBwaypipe server\fR when given to \fBwaypipe
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ssh\fR.\& The flag also controls the thread count for \fBwaypipe bench\fR.\& The default
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behavior (choosable by setting \fBT\fR to \fI0\fR) is to use half as many threads
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as the computer has hardware threads available.\&
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.P
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.RE
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\fB--unlink-socket\fR
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.RS 4
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Only for server mode; on shutdown, unlink the Unix socket that waypipe connects to.\&
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.P
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.RE
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\fB--video[=V]\fR
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.RS 4
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Compress specific DMABUF formats using a lossy video codec.\& Opaque, 10-bit, and
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multiplanar formats, among others, are not supported.\& \fBV\fR is a comma separated
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list of options to control the video encoding.\& Using the \fB--video\fR flag without
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setting any options is equivalent to using the default setting of:
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\fB--video=sw,bpf=120000,h264\fR.\& Later options supersede earlier ones.\&
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.P
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\fBsw\fR
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.RS 4
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Use software encoding and decoding.\&
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.P
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.RE
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\fBhw\fR
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.RS 4
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Use hardware (VAAPI) encoding and decoding, if available.\& This can be finicky
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and may only work with specific window buffer formats and sizes.\&
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.P
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.RE
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\fBh264\fR
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.RS 4
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Use H.\&264 encoded video.\&
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.P
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.RE
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\fBvp9\fR
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.RS 4
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Use VP9 encoded video.\&
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.P
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.RE
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\fBbpf=B\fR
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.RS 4
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Set the target bit rate of the video encoder, in units of bits per frame.\&
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\fBB\fR can be written as an integer or with exponential notation; thus
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\fB--video=bpf=7.\&5e5\fR is equivalent to \fB--video=bpf=750000\fR.\&
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.P
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.RE
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.RE
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\fB--hwvideo\fR
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.RS 4
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Deprecated option, equivalent to --video=hw .\&
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.P
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.RE
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.SH EXAMPLE
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.P
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The following \fBwaypipe ssh\fR subcommand will attempt to run \fBweston-flower\fR on
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the server \fIexserv\fR, displaying the result on the local system.\&
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.P
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.nf
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.RS 4
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waypipe ssh user@exserv weston-flower
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.fi
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.RE
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.P
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One can obtain similar behavior by explicitly running waypipe and ssh:
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.P
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.nf
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.RS 4
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waypipe --socket /tmp/socket-client client &
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ssh -R /tmp/socket-server:/tmp/socket-client user@exserv \\
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waypipe --socket /tmp/socket-server server -- weston-flower
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kill %1
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.fi
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.RE
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.P
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Waypipe may be run locally without an SSH connection by specifying matching
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socket paths.\& For example:
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.P
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.nf
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.RS 4
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waypipe --socket /tmp/waypipe\&.sock client &
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waypipe --socket /tmp/waypipe\&.sock server weston-simple-dmabuf-egl
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kill %1
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rm /tmp/waypipe\&.sock
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.fi
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.RE
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.P
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Using transports other than SSH is a bit more complicated.\& A recipe with ncat
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to connect to \fIremote\fR from computer \fIlocal\fR:
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.P
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.nf
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.RS 4
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$ waypipe --socket /tmp/waypipe-remote\&.sock client &
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$ ncat --ssl -lk 12345 --sh-exec \&'ncat -U /tmp/waypipe-remote\&.sock\&' &
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$ ssh user@remote
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> ncat -lkU /tmp/waypipe-local\&.sock --sh-exec \&'ncat --ssl local 12345\&' &
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> waypipe --display wayland-local \\
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--socket /tmp/waypipe-local\&.sock server -- sleep inf &
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> WAYLAND_DISPLAY=wayland-local application
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.fi
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.RE
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.P
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Given a certificate file, socat can also provide an encrypted connection
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(remove '\&verify=0'\& to check certificates):
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.P
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.nf
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.RS 4
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$ waypipe --socket /tmp/waypipe-remote\&.sock client &
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$ socat openssl-listen:12345,reuseaddr,cert=certificate\&.pem,verify=0,fork \\
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unix-connect:/tmp/waypipe-remote\&.sock
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$ ssh user@remote
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> socat unix-listen:/tmp/waypipe-local\&.sock,reuseaddr,fork \\
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openssl-connect:local:12345,verify=0 &
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> waypipe --socket /tmp/waypipe-local\&.sock server -- application
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.fi
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.RE
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.P
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Many applications require specific environment variables to use Wayland instead
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of X11.\& If ssh isn'\&t configured to support loading \fI~/.\&ssh/environment\fR,
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one can use \fIenv\fR to set the needed variables each time; or run waypipe without
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a command, to use the login shell environment.\&
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.P
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.nf
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.RS 4
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waypipe ssh user@host env XDG_SESSION_TYPE=wayland dolphin
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.fi
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.RE
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.P
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Waypipe has support for reconnecting a \fBwaypipe client\fR and a \fBwaypipe server\fR
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instance when whatever was used to transfer data between their sockets fails.\&
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For this to work, waypipe must still be running on both sides of the connection.\&
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As the \fBwaypipe ssh\fR wrapper will automatically close both the \fBwaypipe client\fR
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and the \fBwaypipe server\fR when the connection fails, the client and server modes
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must be run seprately.\& For example, to persistently forward applications running
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on server \fIrserv\fR to a local Wayland compositor running on \fIlserv\fR, one would
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first set up a waypipe client instance on \fIlserv\fR,
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.P
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.nf
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.RS 4
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waypipe -s /tmp/waypipe\&.sock client &
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.fi
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.RE
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.P
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and on server \fIrserv\fR, establish socket forwarding and run the server
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.P
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.nf
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.RS 4
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ssh -fN -L /tmp/waypipe-lserv\&.sock:/tmp/waypipe\&.sock user@lserv
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waypipe -s /tmp/waypipe-lserv\&.sock --control /tmp/ctrl-lserv\&.pipe \\
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--display wayland-lserv server -- sleep inf &
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.fi
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.RE
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.P
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then set \fIWAYLAND_DISPLAY=wayland-lserv\fR and run the desired applications.\&
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When the ssh forwarding breaks, on \fIrserv\fR, reconnect with
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.P
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.nf
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.RS 4
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ssh -fN -L /tmp/waypipe-lserv-2\&.sock:/tmp/waypipe\&.sock user@lserv
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waypipe recon /tmp/ctrl-lserv\&.pipe /tmp/waypipe-lserv-2\&.sock
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.fi
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.RE
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.P
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.SH ENVIRONMENT
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.P
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When running as a server, by default \fIWAYLAND_DISPLAY\fR will be set for the
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invoked process.\&
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.P
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If the \fB--oneshot\fR flag is set, waypipe will instead set \fIWAYLAND_SOCKET\fR and
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inherit an already connected socketpair file descriptor to the invoked (child)
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process.\& Some programs open and close a Wayland connection repeatedly as part
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of their initialization, and will not work correctly with this flag.\&
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.P
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.SH EXIT STATUS
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.P
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\fBwaypipe ssh\fR will exit with the exit status code from the remote command, or
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with return code 1 if there has been an error.\&
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.P
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.SH BUGS
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.P
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File bug reports at: https://gitlab.\&freedesktop.\&org/mstoeckl/waypipe/
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.P
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Some programs (gnome-terminal, firefox, kate, among others) have special
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mechanisms to ensure that only one process is running at a time.\& Starting
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those programs under Waypipe while they are running under a different
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Wayland compositor may silently open a window or tab in the original
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instance of the program.\& Such programs may have a command line argument
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to create a new instance.\&
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.P
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.SH SEE ALSO
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.P
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\fBweston\fR(1), \fBssh\fR(1), \fBsocat(1)\fR, \fBncat(1)\fR
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MSVSphere Packaging Team
2 years ago