system_update_committer_config/
system_update_committer_config_rust_config_lib_source.rs

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
use fidl::unpersist;
use fidl_cf_sc_internal_systemupdatecommitterconfig::Config as FidlConfig;
use fuchsia_inspect::Node;
use fuchsia_runtime::{take_startup_handle, HandleInfo, HandleType};
#[derive(Debug)]
pub struct Config {
    pub stop_on_idle_timeout_millis: i64,
}
impl Config {
    pub fn take_from_startup_handle() -> Self {
        let config_vmo: zx::Vmo =
            take_startup_handle(HandleInfo::new(HandleType::ComponentConfigVmo, 0))
                .expect("Config VMO handle must be provided and cannot already have been taken.")
                .into();
        let config_size =
            config_vmo.get_content_size().expect("must be able to read config vmo content size");
        assert_ne!(config_size, 0, "config vmo must be non-empty");
        let config_bytes =
            config_vmo.read_to_vec(0, config_size).expect("must be able to read config vmo");
        let checksum_length = u16::from_le_bytes([config_bytes[0], config_bytes[1]]) as usize;
        let fidl_start = 2 + checksum_length;
        let observed_checksum = &config_bytes[2..fidl_start];
        let expected_checksum = vec![
            0x90, 0xc3, 0x40, 0xf6, 0xdc, 0x5c, 0x98, 0x0c, 0xc5, 0xd9, 0xdd, 0x83, 0xab, 0xea,
            0x20, 0x0c, 0x8c, 0xe4, 0x1d, 0x65, 0xc6, 0x6d, 0x35, 0x4f, 0x0c, 0xd0, 0x51, 0xa2,
            0x3a, 0xa8, 0xd4, 0xe4,
        ];
        assert_eq!(
            observed_checksum, expected_checksum,
            "checksum from config VMO does not match expected checksum"
        );
        let fidl_config: FidlConfig = unpersist(&config_bytes[fidl_start..])
            .expect("must be able to parse bytes as config FIDL");
        Self { stop_on_idle_timeout_millis: fidl_config.stop_on_idle_timeout_millis }
    }
    pub fn record_inspect(&self, inspector_node: &Node) {
        inspector_node.record_int("stop_on_idle_timeout_millis", self.stop_on_idle_timeout_millis);
    }
}