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Extract timezone info from tzdata file on Android #978

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merged 2 commits into from May 26, 2023
Merged

Extract timezone info from tzdata file on Android #978

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02ee240
Extract timezone info from tzdata file on Android
RumovZ Mar 4, 2023
53fa3f2
Move up tzdata lookup on Android
RumovZ Apr 6, 2023
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9 changes: 8 additions & 1 deletion .github/workflows/test.yml
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Expand Up @@ -99,7 +99,14 @@ jobs:
strategy:
matrix:
os: [ubuntu-latest]
target: [wasm32-unknown-unknown, wasm32-wasi, wasm32-unknown-emscripten, aarch64-apple-ios, aarch64-linux-android]
target:
[
wasm32-unknown-unknown,
wasm32-wasi,
wasm32-unknown-emscripten,
aarch64-apple-ios,
aarch64-linux-android,
]
runs-on: ${{ matrix.os }}
steps:
- uses: actions/checkout@v2
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3 changes: 3 additions & 0 deletions Cargo.toml
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Expand Up @@ -49,6 +49,9 @@ winapi = { version = "0.3.0", features = ["std", "minwinbase", "minwindef", "tim
[target.'cfg(unix)'.dependencies]
iana-time-zone = { version = "0.1.45", optional = true, features = ["fallback"] }

[target.'cfg(target_os = "android")'.dependencies]
android-tzdata = "0.1.1"

[dev-dependencies]
serde_json = { version = "1" }
serde_derive = { version = "1", default-features = false }
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8 changes: 8 additions & 0 deletions src/offset/local/tz_info/timezone.rs
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Expand Up @@ -43,6 +43,14 @@ impl TimeZone {
return Self::from_tz_data(&fs::read("/etc/localtime")?);
}

// attributes are not allowed on if blocks in Rust 1.38
#[cfg(target_os = "android")]
{
if let Ok(bytes) = android_tzdata::find_tz_data(tz_string) {
return Self::from_tz_data(&bytes);
}
}

let mut chars = tz_string.chars();
if chars.next() == Some(':') {
return Self::from_file(&mut find_tz_file(chars.as_str())?);
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7 changes: 3 additions & 4 deletions src/offset/local/unix.rs
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Expand Up @@ -68,19 +68,18 @@ struct Cache {
last_checked: SystemTime,
}

#[cfg(target_os = "android")]
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const TZDB_LOCATION: &str = " /system/usr/share/zoneinfo";

#[cfg(target_os = "aix")]
const TZDB_LOCATION: &str = "/usr/share/lib/zoneinfo";

#[allow(dead_code)] // keeps the cfg simpler
#[cfg(not(any(target_os = "android", target_os = "aix")))]
const TZDB_LOCATION: &str = "/usr/share/zoneinfo";

fn fallback_timezone() -> Option<TimeZone> {
let tz_name = iana_time_zone::get_timezone().ok()?;
#[cfg(not(target_os = "android"))]
let bytes = fs::read(format!("{}/{}", TZDB_LOCATION, tz_name)).ok()?;
#[cfg(target_os = "android")]
let bytes = android_tzdata::find_tz_data(&tz_name).ok()?;
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In PR code for src/offset/local/tz_info/timezone.rs (above) the fn from_posix_tz code attempts do things the "Android Way" but if that doesn't succeed it falls back to the current implementation. Specifically, if android_tzdata::find_tz_data(tz_string) fails it will fall through and use the current general implementation.

Should fn fallback_timezone code allow a similar fallback? e.g.

fn fallback_timezone() -> Option<TimeZone> {
    let tz_name = iana_time_zone::get_timezone().ok()?;
    #[cfg(target_os = "android")]
    if let Ok(bytes) = android_tzdata::find_tz_data(&tz_name).ok() {
        return TimeZone::from_tz_data(&bytes).ok();
    }
    let bytes = fs::read(format!("{}/{}", TZDB_LOCATION, tz_name)).ok()?;
    TimeZone::from_tz_data(&bytes).ok()
}

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In from_posix_tz(), we try to parse the tz string as a transition rule as a fallback, which should or shouldn't work regardless of the OS. On the other hand, trying to find a tz file on Android won't ever work, as far as I know, so I don't think it makes sense as a fallback.

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Okay. 👍

TimeZone::from_tz_data(&bytes).ok()
}

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