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pane_parse() attempts to grab the output from the last command issued
into a tmux pane. It strips out control characters using tr, which in
particular includes the final \r\n. However, this won't fully strip
out terminal escape sequences. In particular this breaks if the shell
in the pane is bash, with enable-bracketed-paste enabled in readline.
That issues terminal sequences to enable and disable bracketed paste
mode around every shell prompt.
We can work around this because these escapes are followed by a \r
(CR). More generally, it seems reasonable to assume that any terminal
shenanigans followed by a CR, but not an LF is supposed to be hidden.
So, use sed to strip everything before the second last CR. We still
need the tr to remove the final \r\n from the string (sed processes a
line at a time, and doesn't consider the CRLF part of the buffer it's
processing).
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
[sbrivio: modify regexp to keep foo\r\r\n unchanged, by matching on at
least one CR and a non-CR afterwards: that's the usual output pattern
for bash on Debian 8 and Debian 9]
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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run_term() uses tmux set-option -g to globally set the default shell.
Unfortunately this hits a chicken-and-egg problem that's common with many
of tmux's session options. If there isn't already a tmux server running,
we can't connect to set the option. If we attempt this after starting our
session (and therefore the server), then the session will already be
started with the previous default shell.
In any case it's not a good idea to set tmux global options, since that
might interfere with whatever else the user is doing in tmux. So, instead
set the default-shell option locally to the session after starting it. To
make sure we get the right shell for our initial script, explicitly invoke
/bin/sh to interpret it.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
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The semantics of tmux's update-environment option are a bit confusing.
It says it means the given variables are copied into the session
environment from the source environment, but it's not entirely clear
what the "source" environment means.
From my experimentation it appeast to be the environment from which
the tmux *server* is launched, not the one issuing the 'new-session'
command. That makes it pretty much useles, certainly in our case where
we have no way of knowing if the user has pre-existing tmux sessions.
Instead use the new-session -e option to explicitly pass in the variables
we want to propagate.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
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Don't fetch the log too early, we might get output from previous
commands.
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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I changed this in a previous commit by mistake, restore the original
command.
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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For demos, cool-retro-term(1) looked fancier, but several threads of
that and ffmpeg(1) are just messing up with performance testing.
The CI videos started getting really big as well, and they were
difficult to read.
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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...showing setup steps, some peculiarities as --net option, and a
general side-to-side comparison with slirp4netns(1), including
"quick" TCP and UDP throughput and latency benchmarks.
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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We might have highlighting and slightly different prompts across
different distributions, allow a more reasonable set of prompt
strings to be accepted as prompts.
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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Otherwise, this would depend on the local tmux configuration.
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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Not really quick, definitely dirty.
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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