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guest: mount cgroup2, set hanzo-vm hostname, resolvable localhost

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Mount /sys/fs/cgroup as cgroup2 rw at boot, set the hostname to
hanzo-vm, and write /etc/hosts when the rootfs ships without one so
localhost and the hostname resolve.

Co-authored-by: Hanzo Dev <[email protected]>
This commit is contained in:
zeekay
2026-09-01 12:13:23 -07:00
co-authored by Hanzo Dev
parent a4fccc537b
commit 60596f9f3c
1 changed files with 11 additions and 3 deletions
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crates/vm-guest/src/main.rs
+11 -3
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@@ -103,6 +103,7 @@ mod guest {
Some("newinstance,ptmxmode=0666"),
);
mount_fs("tmpfs", "/tmp", "tmpfs", None);
mount_fs("cgroup2", "/sys/fs/cgroup", "cgroup2", None);
}
fn process_mount(req: &MountRequest) -> MountResponse {
@@ -1632,10 +1633,17 @@ mod guest {
ensure_stdio();
stage("filesystems mounted");
// Set hostname
let hostname = b"vm\0";
// Set hostname and make localhost + hostname resolvable
let hostname = b"hanzo-vm\0";
unsafe {
libc::sethostname(hostname.as_ptr() as *const libc::c_char, 2);
libc::sethostname(hostname.as_ptr() as *const libc::c_char, hostname.len() - 1);
}
if !std::path::Path::new("/etc/hosts").exists() {
std::fs::write(
"/etc/hosts",
"127.0.0.1\tlocalhost\n127.0.1.1\thanzo-vm\n::1\tlocalhost ip6-localhost ip6-loopback\n",
)
.ok();
}
setup_networking();