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feat(users/Profpatsch/execline): add setsid

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Small wrapper around `setsid(2)` that does not exist in the
execline-style tooling.

Is probably gonna fail iff our process is a session leader already,
but I haven’t tried that out yet.

Change-Id: I1a820f1c6d65ddc29c30995bfd56a760a9d6b341
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11167
Tested-by: BuildkiteCI
Autosubmit: Profpatsch <mail@profpatsch.de>
Reviewed-by: Profpatsch <mail@profpatsch.de>
This commit is contained in:
Profpatsch 2024-03-16 22:29:48 +01:00 committed by clbot
parent 981c7fef0e
commit 16461c4100
1 changed files with 22 additions and 0 deletions
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22
users/Profpatsch/execline/default.nix
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@ -39,10 +39,32 @@ let
}
'';
setsid = depot.nix.writers.rustSimple
{
name = "setsid";
dependencies = [
depot.users.Profpatsch.execline.exec-helpers
depot.third_party.rust-crates.libc
];
} ''
use std::os::unix::ffi::OsStrExt;
use std::ffi::OsStr;
fn main() {
let (args, prog) = exec_helpers::args_for_exec("setsid", 1);
let envvar = OsStr::from_bytes(&args.get(0).expect("first argument must be envvar name to set"));
let sid: i32 = unsafe { libc::setsid() };
std::env::set_var(envvar, format!("{}", sid));
let env: Vec<(&[u8], &[u8])> = vec![];
exec_helpers::exec_into_args("getid", prog, env);
}
'';
in
depot.nix.readTree.drvTargets {
inherit
exec-helpers-hs
print-one-env
setsid
;
}