[Toybox] toysh - Bash interoperability, clang+musl build, testing (for corner cases)?

[enh]

On Fri, Dec 25, 2020 at 6:18 PM Thorben Brandt <thorben at brandt.zone> wrote:

> Hi there!
> This is my first post to this list (any list, in fact) so please bear with
> me if I'm doing something wrong. I've been following the Toybox project
> for
> a while now after stumbling into a recording of one of Rob's talks on
> Youtube.
> When digging down into things recently, I was particularly delighted to
> see
> that toysh aims to adhere to the (quote unquote) bash standard, it was
> quite
> fun to follow through the bunch of threads regarding that subject.
>
> Here's some links to (in my eyes) particularly interesting threads on the
> list archive, as I'm not sure if slapping them in here as a bunch of quotes
> would be the right approach.
>
> If anyone has a link to a paper titled something along the lines of "How
> to
> use a Mailing List as a 90s kid", I'll happily study it!
>
>
> [ toysh vs dash ]
>
>
> http://lists.landley.net/pipermail/toybox-landley.net/2020-October/012087.html
>
> I'm aiming to replace bash. I don't have a "remove any feature that's not in
> posix" flag yet.
>
> See above, this is what piqued my interest to the point of eventually
> signing
> up for the list and browsing through it for the better part of an
> afternoon.
>
>
> [ Would someone please explain what bash is doing here? ]
>
> http://lists.landley.net/pipermail/toybox-landley.net/2020-June/011788.html
>
> I looked at containers for self-contained build and test environments about
> three years ago, but the lack of a controlling terminal made it not useful.
> Has that changed since? I haven't really looked.
>
> Docker has supported allocation of pseudo-ttys and stdin streams for a
> while
> now [1] (am I missing something?), and systemd-nspawn [2] is intriguing
> but I
> haven't poked at it yet. Coming from a kind-of-sort-of background in
> working
> with containerization concepts (let's be real though, who doesn't these
> days)
> this is something I'd totally love to look into and help out with.
> Problems
> with interactive TTYs in containerized environments pretty much always
> stem
> from running something that doesn't gracefully handle signals as PID 1.
> But
> that's about all I know when it comes to the nitty-gritty of shells so I'd
> love to help and in return learn in the process!
>
>
> [ mkroot works again, pending release. ]
>
>
> http://lists.landley.net/pipermail/toybox-landley.net/2020-October/012073.html
>
> I note that except for a couple large holes (lack of $((math)) and function()
> support, haven't finished trap/signal/jobs, needs command line editing and
> history) toysh is... sort of working now? Several known bugs (test suite
> failures), but it's actually starting to be actually run real scripts. Needs
> auditing for memory leaks, and the largest script I've thrown at it _is_ the
> mkroot init, but... it's advanced from "don't bother" to "object of curiosity".
>
> I suspect that hasn't changed since, alas the prospect of building a
> statically
> linked toysh and trying to daily it on "my actual computer" to in return
> bombard
> you with bug reports isn't quite viable as of yet, is it?
>

if you just want to try toybox on the same computer you normally use, i
don't see why you need any of the cross-compile stuff... just build
normally with `make defconfig` and then `make`?


>
> On that note, it's been an awful while (about 10 years) since I've had any
> meaningful exposure to C. I tried to work my way through the cross
> compilation
> notes and what makes the Android (clang + Bionic) and musl-cross-make (GCC
> + musl)
> processes work, but couldn't quite apply that to making the (new?) clang +
> musl on
> x86_64 combo spin (it eventually compiled but immediately crashed iirc,
> need to
> look into it again).
> If anyone has played around with that particular setup, let me know!
>
>
> TL;DR: I'd like to help - to the extent of my abilities - with making the
> shell
> (more of) a thing in some way if I may, any starting pointers/feedback on
> my above
> interpretations of what's been going on would be greatly appreciated.
> I hope y'all are having nice holidays.
>
> - Thorben
>
>
> References:
>
> [1]
> https://docs.docker.com/engine/reference/commandline/run/#assign-name-and-allocate-pseudo-tty---name--it
>
> [2] https://www.freedesktop.org/software/systemd/man/systemd-nspawn.html
> _______________________________________________
> Toybox mailing list
> Toybox at lists.landley.net
> http://lists.landley.net/listinfo.cgi/toybox-landley.net
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.landley.net/pipermail/toybox-landley.net/attachments/20210105/760c8d8b/attachment.htm>