Date: Mon, 21 Aug 2023 09:21:15 +0200 From: Felix Palmen <zirias@freebsd.org> To: ports@freebsd.org, emulation@freebsd.org Subject: Re: Building a Linuxulator userland from source Message-ID: <cnbxytnfqoh4dr6clz3qdhygeehjh7e3kqjdiarhiqsjhburhk@eotxvli5ma23> In-Reply-To: <SI2PR01MB50366A01896746D4DAFC18F7FA1EA@SI2PR01MB5036.apcprd01.prod.exchangelabs.com> References: <xcztahm3vu3bjghjqqxuoy2xabyjmyfq22jw6mkaaaqo7wa36s@fdq7dlvpuhlk> <i3kr2kukjwgw2xvjlzgshwe72bjpnln4lvl7prhk77nelzidm6@2g56zi3ku7ec> <SI2PR01MB5036EAB6EE2D224BBDAF86B0FA19A@SI2PR01MB5036.apcprd01.prod.exchangelabs.com> <SI2PR01MB50366A01896746D4DAFC18F7FA1EA@SI2PR01MB5036.apcprd01.prod.exchangelabs.com>
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* Tatsuki Makino <tatsuki_makino@hotmail.com> [20230821 15:38]:
> Linux branded ELF is executed by linuxulator no matter where it is
> placed on /, right?
Yes.
> Binaries running on linuxulator have priority access to files in
> /compat/linux.
Well, when they access some file, a path with /compat/linux prepended is
tried first. Only when there's nothing, the original path is tried.
That's it in a nutshell, the exact rules are a bit more complicated.
> What I don't understand is...
> If a linux binary running on linuxulator can't find a linux library,
> but can find a FreeBSD library, can it link and use that FreeBSD
> library?
No.
> Another problem is that linuxulator does not work for the shell script
> shbang.
> The "bash scripts" installed on /compat/linux, such as ldd, try to use
> freebsd bash outside of /compat/linux.
This works perfectly fine when used from within a Linux shell. Example
=66rom testing my new userland:
| [00:00:20] Entering interactive test mode. Type 'exit' when done.
| root@14a-default:~ # /compat/linux/bin/bash
| bash-5.2# ldd /bin/bash
| linux-vdso.so.1 (0x00007fffffffe000)
| libreadline.so.8 =3D> /usr/lib64/libreadline.so.8 (0x000000080115=
4000)
| libhistory.so.8 =3D> /usr/lib64/libhistory.so.8 (0x00000008011ad0=
00)
| libncursesw.so.6 =3D> /usr/lib64/libncursesw.so.6 (0x00000008011b=
b000)
| libc.so.6 =3D> /usr/lib64/libc.so.6 (0x0000000801400000)
| /lib64/ld-linux-x86-64.so.2 (0x0000000001021000)
| bash-5.2#=20
Cheers, Felix
--=20
Felix Palmen <zirias@FreeBSD.org> {private} felix@palmen-it.de
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