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Set up a monotonic clock boot time offset in the VM

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This commit is contained in:
Val Packett 2026-02-20 04:12:54 -03:00
parent 8c3878f117
commit 981393443b
2 changed files with 19 additions and 0 deletions
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14
micro-activate.rs
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@ -8,6 +8,8 @@ const MS_NODEV: c_ulong = 0x04;
const MS_RELATIME: c_ulong = 0x200000;
const MS_STRICTATIME: c_ulong = 0x1000000;
const CLONE_NEWTIME: c_int = 0x80;
unsafe extern "C" {
fn mount(
src: *const c_char,
@ -17,6 +19,7 @@ unsafe extern "C" {
data: *const c_void,
) -> c_int;
fn getrandom(buf: *mut u8, buflen: usize, flags: u32) -> c_int;
fn unshare(flags: c_int) -> c_int;
}
fn gen_machine_id() -> String {
@ -133,6 +136,17 @@ fn main() -> Result<(), std::io::Error> {
);
}
if let Ok(offset) = std::env::var("BOOT_TIME_OFFSET") {
if unsafe { unshare(CLONE_NEWTIME) } != 0 {
eprintln!("[micro-activate] Could not unshare time!");
} else {
std::fs::write(
"/proc/self/timens_offsets",
format!("monotonic {offset}\nboottime {offset}\n"),
)?;
}
}
let mut args = std::env::args_os().skip(1);
let cmd = args.next().unwrap();
Err(std::process::Command::new(cmd).args(args).exec())