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Feature request: https://labs.parabola.nu/issues/458
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This should fix a number of bugs in those two scripts, and the summarize
script simplifies aur and libremakepkg:hooks-check.sh
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Because of the work-around for systemd-nspawn's buggy I/O, it was
discarding the exit status if stdout wasn't a TTY. My work-around for
*this* is to set -o pipefail.
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Also, warn if stdin isn't a TTY.
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I'm a fan of systemd-nspawn. I really am. It handles a lot of things the
"right" way, so you don't have to.
However, it handles PTYs and signals in an incredibly stupid way. Working
around one is f---ed up by the other being wrong.
Before I implemented the change that this reverts, this is what happens:
systemd-nspawn> I need to create a PTY and proxy between it and stdio.
I can specify a terminal size when doing this--I should
set it to reflect the terminal I am connected to.
systemd-nspawn> /dev/stdout: Are you a TTY?
/dev/stdout> systemd-nspawn: No.
---- The correct thing to do here would be to either not set the size,
---- or set it to 80×24
systemd-nspawn> /dev/stdin: Are you a TTY?
/dev/stdin> systemd-nspawn: Yes.
systemd-nspawn> /dev/stdin: Great, what size are you?
/dev/stdin> systemd-nspawn: I am X×Y.
systemd-nspawn: libc: Please give me a PTY that is X×Y.
---- Why the f--- would you do this? The size only effects *output*.
---- If you don't know the characteristics of the output, set
---- reasonable defaults! Don't base it on the characteristics of the
---- input!
My solution was to make /dev/stdin not be a TTY by closing it. This had
the desired effect, but tripped up the signal handling.
Here is how signals were handled before:
systemd-nspawn> /dev/stdin: Are you a TTY?
/dev/stdin> systemd-nspawn: Yes.
systemd-nspawn> /dev/stdin: Great, please don't send SIGINT on C-c.
I will handle it myself.
*user presses C-c, systemd reads it*
systemd-nspawn> child processes: here's a SIGINT.
Here's what happens when I close, or do other things to make stdin not be a
TTY:
systemd-nspawn> /dev/stdin: Are you a TTY?
/dev/stdin> systemd-nspawn: No.
systemd-nspawn> /dev/stdin: Oh, OK.
*user presses C-c, /dev/stdin interprets it*
/dev/stdin> systemd-nspawn: Here's a SIGINT.
systemd-nspawn> *dies, abandoning child processes*
The clear correct thing to do would have been to *handle* SIGINT, and pass
it along to the children.
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Besides preventing interactive use, this prevents the program from knowing
the size of the terminal.
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There are two downsizes to using sed; it line-buffers, and (the existing
pattern) doesn't handle '\r'.
So, now I've included a Perl helper program to do a better job.
I'd originally written it in C, and while that version was faster (the Perl
version stutters occasionally), it required recompilation for different
architectures. I could have gotten around that with tcc, but I didn't want
to add any dependencies. Which is why I settled on Perl. It's part of
group=(base), and it is required by packages in group=(base-devel), so I
can count on it always being there.
It doesn't handle every movement character, just '\n' and '\r', but that's
enough for curl and pacman.
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Conflicts:
src/abslibre-tools/createworkdir
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We split chrootbuild so that the initialization bit runs before
hook_pre_build.
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User-facing changes:
- libremessages: `lock_open_write` became `lock`
- libremessages: `lock_open_read` became `slock`
- librechroot: learned the `-r` and `-w` flags to do bind mounts.
Internal changes:
The changes to librechroot were pretty straight-forward; the biggest
change is that `archroot` got split into `mkarchroot` and
`arch-nspawn`.
libremakepkg got a major overhaul Honestly, the changes to
libremakepklg probably could have been a lot smaller, but... I wanted
to do it right/be clean. makechrootpkg in devtools got cleaned up a
lot, actually a lot of the same changes I was making. But, the small
differences between the way we did things made it less than simple to
adjust. The biggest changes in terms of conflict for me are how
devtools now uses bind-mounts to put files in the chroot, and that the
/chrootbuild file is more complicated.
I handled a lot of the complexity by moving things out of the main
program, and adding hooks for non-core functionality, including
chcleanup, distcc compatability hacks, and PKGBUILD/pkg checking.
Unfortunately, the files containing the hooks are currently
hard-coded. Perhaps they will be truly pluggable in the future. That
might be neat. Or over-complicated. We'll see where it goes.
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chroot-tools
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