else/clan-munix
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

micro-activate: generate machine-id randomly

Browse source 
D-Bus is supposed to (?) use it to decide whether it can use FD passing,
shared memory, etc. and while we do a lot of cross-domain magic it's not
quite seamless :) so let's not reuse the host one.
This commit is contained in:
Val Packett 2025-12-09 06:46:51 -03:00
parent 1d864e0ded
commit f336a0d5ff
2 changed files with 15 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

17
micro-activate.rs
View file

@ -16,6 +16,20 @@ unsafe extern "C" {
flags: c_ulong,
data: *const c_void,
) -> c_int;
fn getrandom(buf: *mut u8, buflen: usize, flags: u32) -> c_int;
}
fn gen_machine_id() -> String {
use std::fmt::Write as _;
let mut bytes: [u8; 16] = [0; 16];
if unsafe { getrandom(bytes.as_mut_ptr(), 16, 0) } == -1 {
eprintln!("[micro-activate] getrandom failed!");
}
let mut result = String::with_capacity(32);
for b in bytes {
let _ = write!(result, "{:02x}", b);
}
result
}
fn parse_tmpfiles_line(line: &str) -> Option<(&str, &str)> {
@ -57,7 +71,6 @@ fn main() -> Result<(), std::io::Error> {
//
// Let's preserve the fixed passed-in files and set up the NixOS symlinks in the new mount.
let resolv_conf = std::fs::read("/run/resolv.conf")?;
let machine_id = std::fs::read("/run/machine-id")?;
assert_eq!(
unsafe {
mount(
@ -71,7 +84,7 @@ fn main() -> Result<(), std::io::Error> {
0
);
std::fs::write("/run/resolv.conf", &resolv_conf)?;
std::fs::write("/run/machine-id", &machine_id)?;
std::fs::write("/run/machine-id", &gen_machine_id())?;
std::os::unix::fs::symlink(&closure, "/run/current-system")?;
if let Ok(tmp_graphics) =
std::fs::read(format!("{closure}/etc/tmpfiles.d/graphics-driver.conf"))