pkg_cache_config/
config_lib_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
40
41
42
43
44
45
46
47
48
49
50
use fidl::unpersist;
use fidl_cf_sc_internal_pkgcacheconfig::Config as FidlConfig;
use fuchsia_inspect::Node;
use fuchsia_runtime::{take_startup_handle, HandleInfo, HandleType};
#[derive(Debug)]
pub struct Config {
    pub all_packages_executable: bool,
    pub enable_upgradable_packages: bool,
    pub use_fxblob: bool,
    pub use_system_image: bool,
}
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![
            0x50, 0x31, 0x81, 0x4e, 0x47, 0x76, 0xaa, 0xbb, 0x26, 0xf4, 0x07, 0xad, 0xbe, 0xfc,
            0xbb, 0x5d, 0x7f, 0x74, 0x50, 0x37, 0x57, 0x85, 0x99, 0xb8, 0xe9, 0xa8, 0xd7, 0xc8,
            0x77, 0x81, 0x73, 0xa5,
        ];
        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 {
            all_packages_executable: fidl_config.all_packages_executable,
            enable_upgradable_packages: fidl_config.enable_upgradable_packages,
            use_fxblob: fidl_config.use_fxblob,
            use_system_image: fidl_config.use_system_image,
        }
    }
    pub fn record_inspect(&self, inspector_node: &Node) {
        inspector_node.record_bool("all_packages_executable", self.all_packages_executable);
        inspector_node.record_bool("enable_upgradable_packages", self.enable_upgradable_packages);
        inspector_node.record_bool("use_fxblob", self.use_fxblob);
        inspector_node.record_bool("use_system_image", self.use_system_image);
    }
}