feat(linux): integrate real civil time, boot id, next_wakeup timer, and dbus notifications

desktop/daemon/src/main.rs

@@ -38,6 +38,7 @@ mod runner;
 use std::path::PathBuf;
 
 use blocker_platform_linux::kwin::BUS_NAME;
+use blocker_platform_linux::{boot, time};
 use std::process::ExitCode;
 
 /// `~/.local/share/blocker/blocker.db`, honouring `XDG_DATA_HOME`.
@@ -152,7 +153,7 @@ fn main() -> ExitCode {
                 schedules: &schedules,
                 usage: &usage,
                 platform_context: &context,
-                boot_id: blocker_core::engine::BootId(0),
+                boot_id: boot::current_boot_id(),
                 enforcement: blocker_platform_linux::Enforcement::Freeze,
             };
             let clock = blocker_platform_linux::SystemMonotonic;
@@ -161,8 +162,7 @@ fn main() -> ExitCode {
             'events: loop {
                 // The wait IS the next wakeup. An idle system parks here rather
                 // than ticking, which is how the section 5 idle budget is met.
-                let (action, blocked) =
-                    runner::step(&rx, std::time::Duration::from_secs(3600), &ctx, &clock, now());
+                let (action, blocked, _) = runner::step(&rx, &ctx, &clock, time::now());
                 if blocked > 0 {
                     println!("blocked an app ({action:?})");
                 }
@@ -199,14 +199,13 @@ fn run_loop(
         schedules,
         usage,
         platform_context: context,
-        boot_id: blocker_core::engine::BootId(0),
+        boot_id: boot::current_boot_id(),
         enforcement,
     };
     let clock = blocker_platform_linux::SystemMonotonic;
     println!("enforcement: {enforcement:?}; entering the event loop");
     'events: loop {
-        let (action, blocked) =
-            runner::step(rx, std::time::Duration::from_secs(3600), &ctx, &clock, now());
+        let (action, blocked, _) = runner::step(rx, &ctx, &clock, time::now());
         if blocked > 0 {
             println!("blocked an app ({action:?})");
         }
@@ -215,13 +214,3 @@ fn run_loop(
         }
     }
 }
-
-/// Civil time, from the platform layer.
-///
-/// A placeholder reading rather than a clock read: the loop's correctness
-/// depends on `next_wakeup` arithmetic, and wiring a real timezone-aware source
-/// is part of the next PR. Deliberately returns a fixed instant so the loop is
-/// obviously not yet time-driven, instead of appearing to work by accident.
-fn now() -> blocker_core::engine::CivilTime {
-    blocker_core::engine::CivilTime { epoch_minutes: 0, utc_offset_minutes: 0 }
-}

desktop/daemon/src/runner.rs

@@ -73,25 +73,35 @@ impl LoopContext<'_> {
 /// event in, one decision out — instead of racing a thread.
 pub fn step(
     events: &Receiver<FocusEvent>,
-    wait: Duration,
     ctx: &LoopContext<'_>,
     clock: &dyn MonotonicSource,
     wall: CivilTime,
-) -> (Action, usize) {
+) -> (Action, usize, Duration) {
+    let mono = Monotonic(clock.now_ms());
+    let decision = blocker_core::evaluate(&ctx.input(wall, mono));
+    let wait = match decision.next_wakeup {
+        Some(wakeup) if wakeup.epoch_minutes > wall.epoch_minutes => {
+            let diff_mins = (wakeup.epoch_minutes - wall.epoch_minutes) as u64;
+            Duration::from_secs(diff_mins * 60)
+        }
+        Some(_) => Duration::from_secs(60),
+        None => Duration::from_secs(3600),
+    };
+
     let event = match events.recv_timeout(wait) {
         Ok(event) => event,
         // A timeout is the `next_wakeup` firing. Re-evaluate, which is the whole
         // point of having armed it.
         Err(RecvTimeoutError::Timeout) => {
             let _ = evaluate_now(ctx, clock, wall);
-            return (Action::Idle, 0);
+            return (Action::Idle, 0, wait);
         }
         // The watcher thread is gone. Nothing can arrive, so re-evaluating on a
         // timer would be the polling this design exists to avoid. Return a
         // zero duration and let the caller decide; with no channel there is
         // nothing left to wake for.
         Err(RecvTimeoutError::Disconnected) => {
-            return (Action::Idle, 0);
+            return (Action::Idle, 0, Duration::ZERO);
         }
     };
 
@@ -105,7 +115,7 @@ pub fn step(
         FocusEvent::Cleared => 0,
     };
 
-    (action, blocked)
+    (action, blocked, wait)
 }
 
 /// Evaluate, and enforce against whatever just took focus.
@@ -149,7 +159,14 @@ fn enforce_if_blocked(
     };
 
     match enforce::apply(ctx.enforcement, pid) {
-        Ok(()) => 1,
+        Ok(()) => {
+            let target_name = window.desktop_id.as_deref().unwrap_or("Application");
+            let _ = blocker_platform_linux::notify::send_notification(
+                &format!("Blocker: {target_name} blocked"),
+                "Focus blocked by active schedule",
+            );
+            1
+        }
         Err(e) => {
             // Logged, not fatal. A process that exited between the focus event
             // and the signal is the common case and must not stop the loop.

desktop/platform-linux/src/boot.rs

@@ -0,0 +1,29 @@
+//! Read host boot identifier for tracking reboots without root privileges.
+
+use blocker_core::engine::BootId;
+use std::fs;
+
+/// Read current system boot id from `/proc/sys/kernel/random/boot_id`.
+/// If unavailable, falls back to `BootId(0)`.
+pub fn current_boot_id() -> BootId {
+    if let Ok(content) = fs::read_to_string("/proc/sys/kernel/random/boot_id") {
+        let trimmed = content.trim().replace('-', "");
+        if trimmed.len() >= 16 {
+            if let Ok(id) = u64::from_str_radix(&trimmed[..16], 16) {
+                return BootId(id);
+            }
+        }
+    }
+    BootId(0)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn reads_boot_id() {
+        let b = current_boot_id();
+        assert_ne!(b.0, 0);
+    }
+}

desktop/platform-linux/src/lib.rs

@@ -39,8 +39,11 @@
 //! - None of this can be made tamper-proof against a user with root. Section
 //!   6.1 requires this be documented honestly rather than implied otherwise.
 
+pub mod boot;
 pub mod enforce;
 pub mod kwin;
+pub mod notify;
+pub mod time;
 pub mod watcher;
 pub mod x11;
 

desktop/platform-linux/src/notify.rs

@@ -0,0 +1,31 @@
+//! Desktop notifications for Blocker enforcement actions.
+//!
+//! Uses the standard freedesktop Notifications D-Bus specification
+//! (`org.freedesktop.Notifications`).
+
+use zbus::blocking::Connection;
+
+/// Send a non-disruptive desktop notification when enforcement triggers.
+pub fn send_notification(summary: &str, body: &str) -> Result<u32, zbus::Error> {
+    let connection = Connection::session()?;
+    let proxy = zbus::blocking::Proxy::new(
+        &connection,
+        "org.freedesktop.Notifications",
+        "/org/freedesktop/Notifications",
+        "org.freedesktop.Notifications",
+    )?;
+    let id: u32 = proxy.call(
+        "Notify",
+        &(
+            "Blocker",
+            0u32,
+            "dialog-information",
+            summary,
+            body,
+            Vec::<String>::new(),
+            std::collections::HashMap::<String, zbus::zvariant::Value>::new(),
+            5000i32,
+        ),
+    )?;
+    Ok(id)
+}

desktop/platform-linux/src/time.rs

@@ -0,0 +1,134 @@
+//! Wall clock and timezone query implementation for Linux.
+//!
+//! Provides the current [`CivilTime`] with local timezone offset without pulling in
+//! heavy third-party datetime crates, and purely in safe Rust (`forbid(unsafe_code)`).
+
+use blocker_core::engine::CivilTime;
+use std::fs;
+use std::time::{SystemTime, UNIX_EPOCH};
+
+/// Read current civil time and local UTC offset in minutes.
+pub fn now() -> CivilTime {
+    let now = SystemTime::now();
+    let epoch_secs = now.duration_since(UNIX_EPOCH).map(|d| d.as_secs() as i64).unwrap_or(0);
+    let epoch_minutes = epoch_secs / 60;
+    let utc_offset_minutes = read_local_offset_minutes();
+
+    CivilTime { epoch_minutes, utc_offset_minutes }
+}
+
+/// Parse local UTC offset in minutes from `/etc/localtime` TZ string or standard fallback.
+fn read_local_offset_minutes() -> i32 {
+    // Check TZ environment variable first
+    if let Ok(tz) = std::env::var("TZ") {
+        if let Some(offset) = parse_tz_string_offset(&tz) {
+            return offset;
+        }
+    }
+
+    // Try reading TZ footer string from /etc/localtime (POSIX TZ string at end of TZif file)
+    if let Ok(bytes) = fs::read("/etc/localtime") {
+        if let Some(offset) = parse_tzif_footer_offset(&bytes) {
+            return offset;
+        }
+    }
+
+    0
+}
+
+/// Parses the trailing newline-terminated POSIX TZ string in a TZif file (RFC 8536).
+/// E.g. "\nMSK-3\n" -> +3 hours -> +180 minutes.
+/// Note that POSIX TZ string syntax inverts the sign: "MSK-3" means GMT+3!
+fn parse_tzif_footer_offset(bytes: &[u8]) -> Option<i32> {
+    if bytes.len() < 2 {
+        return None;
+    }
+    // Search backward for the last newline
+    let mut end = bytes.len();
+    if bytes[end - 1] == b'\n' {
+        end -= 1;
+    }
+    let start = bytes[..end].iter().rposition(|&b| b == b'\n')? + 1;
+    let tz_str = std::str::from_utf8(&bytes[start..end]).ok()?;
+    parse_tz_string_offset(tz_str)
+}
+
+/// Parses a POSIX TZ string like "MSK-3" or "UTC" or "EST5EDT".
+fn parse_tz_string_offset(tz: &str) -> Option<i32> {
+    let bytes = tz.as_bytes();
+    let mut i = 0;
+    // Skip name (letters or <...>)
+    if i < bytes.len() && bytes[i] == b'<' {
+        i += 1;
+        while i < bytes.len() && bytes[i] != b'>' {
+            i += 1;
+        }
+        if i < bytes.len() {
+            i += 1;
+        }
+    } else {
+        while i < bytes.len() && (bytes[i].is_ascii_alphabetic()) {
+            i += 1;
+        }
+    }
+
+    if i >= bytes.len() {
+        return Some(0); // e.g. "UTC"
+    }
+
+    // Next is optional sign: '+' or '-'
+    let mut sign = 1; // Default no sign is positive in POSIX, which represents behind UTC (e.g. EST5 = UTC-5)
+    if bytes[i] == b'+' {
+        sign = 1;
+        i += 1;
+    } else if bytes[i] == b'-' {
+        sign = -1;
+        i += 1;
+    }
+
+    // Read hours
+    let h_start = i;
+    while i < bytes.len() && bytes[i].is_ascii_digit() {
+        i += 1;
+    }
+    if h_start == i {
+        return None;
+    }
+    let hours: i32 = std::str::from_utf8(&bytes[h_start..i]).ok()?.parse().ok()?;
+    let mut minutes = 0;
+
+    // Optional :mm
+    if i < bytes.len() && bytes[i] == b':' {
+        i += 1;
+        let m_start = i;
+        while i < bytes.len() && bytes[i].is_ascii_digit() {
+            i += 1;
+        }
+        if m_start < i {
+            minutes = std::str::from_utf8(&bytes[m_start..i]).ok()?.parse().ok().unwrap_or(0);
+        }
+    }
+
+    let total_mins = hours * 60 + minutes;
+    Some(-sign * total_mins)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn parse_tz_examples() {
+        assert_eq!(parse_tz_string_offset("UTC"), Some(0));
+        assert_eq!(parse_tz_string_offset("MSK-3"), Some(180));
+        assert_eq!(parse_tz_string_offset("EST5"), Some(-300));
+        assert_eq!(parse_tz_string_offset("CST6CDT"), Some(-360));
+    }
+
+    #[test]
+    fn now_produces_reasonable_civil_time() {
+        let t = now();
+        assert!(t.epoch_minutes > 28_000_000);
+        assert!(t.utc_offset_minutes >= -720 && t.utc_offset_minutes <= 840);
+    }
+}