linux-kernel - Re: [PATCH] scripts/gen-btf.sh: fix shebang for NixOS

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Message-ID: <1897b382-41b7-4d63-815d-ac63f38485ee@linux.dev>
Date: Tue, 20 Jan 2026 20:49:59 -0800
From: Ihor Solodrai <ihor.solodrai@...ux.dev>
To: Gary Guo <gary@...yguo.net>, Thomas Weißschuh
 <linux@...ssschuh.net>
Cc: Alexei Starovoitov <ast@...nel.org>,
 Daniel Borkmann <daniel@...earbox.net>, Andrii Nakryiko <andrii@...nel.org>,
 Martin KaFai Lau <martin.lau@...ux.dev>, Eduard Zingerman
 <eddyz87@...il.com>, Song Liu <song@...nel.org>,
 Yonghong Song <yonghong.song@...ux.dev>,
 John Fastabend <john.fastabend@...il.com>, KP Singh <kpsingh@...nel.org>,
 Stanislav Fomichev <sdf@...ichev.me>, Hao Luo <haoluo@...gle.com>,
 Jiri Olsa <jolsa@...nel.org>, bpf@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scripts/gen-btf.sh: fix shebang for NixOS



On 1/20/26 3:54 PM, Gary Guo wrote:
>> [...]
>>
>> So it's trivial to put $(CONFIG_SHELL) in front of it. But then it
>> must be migrated to #!/bin/sh, right?
> 
> Documentation/kbuild/makefiles.rst says:
> 
> Make rules may invoke scripts to build the kernel. The rules shall
> always provide the appropriate interpreter to execute the script. They
> shall not rely on the execute bits being set, and shall not invoke the
> script directly. For the convenience of manual script invocation, such
> as invoking ./scripts/checkpatch.pl, it is recommended to set execute
> bits on the scripts nonetheless.
> 
> Kbuild provides variables $(CONFIG_SHELL), $(AWK), $(PERL),
> and $(PYTHON3) to refer to interpreters for the respective
> scripts.
> 
> So I suppose it would need to migate to POSIX shell...

That's my blunder then.

I'll send a patch tomorrow to make gen-btf.sh runnable with /bin/sh

> 
> Best,
> Gary