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logger: per-process log files under /var/log/<boot-stamp>/

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The logger service drains the tagged ring every 250 ms and demultiplexes
it into one file per process on the flash volume:

    /mnt/usb/var/log/2026-07-21T150434Z/system/services/fat.log
    [     0.214] mounted FAT (fat32, 128992 clusters, partition lba 0)

The boot stamp is the wall-clock anchor from klog_status (FAT-safe, no
colons); the kernel's records go to kernel.log; each line carries the
record's monotonic timestamp and level. Storage is best-effort and
late — the ring buffers a whole boot until the mount appears, then the
first drain writes the backlog, storage-stack records included. Lost
records surface as '-- N records lost --' from sequence gaps. Files
close (= fat's device cache flush) after a 2 s quiet period, bounding
data-at-risk without per-record flush thrash. The logger announces
itself once — a periodic status line would feed the stream it drains.

init spawns the logger last, so the reverse-order shutdown stops it
first and its final drain runs over a live storage chain; log-flush and
init's own DANOS.LOG shutdown flush retire (superseded). runtime.fs
makePath treats components at or above a mount point as router names —
create is best-effort per prefix, the final verdict is exists(path).
This commit is contained in:
Daniel Samson
2026-07-21 16:05:46 +01:00
parent 30d6ea622a
commit 127ea2dad9
7 changed files with 325 additions and 118 deletions
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build.zig
+2 -2
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@@ -581,7 +581,7 @@ pub fn build(b: *std.Build) void {
const input_test_exe = addUserBinary(b, kernel_target, runtime_module, mmio_module, xkeyboard_config_module, acpi_ids_module, "input-test", "system/services/input-test/input-test.zig");
const args_echo_exe = addUserBinary(b, kernel_target, runtime_module, mmio_module, xkeyboard_config_module, acpi_ids_module, "args-echo", "system/services/args-echo/args-echo.zig");
const process_test_exe = addUserBinary(b, kernel_target, runtime_module, mmio_module, xkeyboard_config_module, acpi_ids_module, "process-test", "system/services/process-test/process-test.zig");
const log_flush_exe = addUserBinary(b, kernel_target, runtime_module, mmio_module, xkeyboard_config_module, acpi_ids_module, "log-flush", "system/services/log-flush/log-flush.zig");
const logger_exe = addUserBinary(b, kernel_target, runtime_module, mmio_module, xkeyboard_config_module, acpi_ids_module, "logger", "system/services/logger/logger.zig");
// The first multi-threaded binary: exercises runtime.Thread over the thread ABI
// (docs/threading.md). Built threaded so its shared-memory poll is real.
const thread_test_exe = addThreadedUserBinary(b, kernel_target, runtime_module, mmio_module, xkeyboard_config_module, acpi_ids_module, "thread-test", "system/services/thread-test/thread-test.zig");
@@ -601,7 +601,7 @@ pub fn build(b: *std.Build) void {
.{ .path = "system/services/device-manager", .binary = device_manager_exe.getEmittedBin() },
.{ .path = "system/services/input", .binary = input_exe.getEmittedBin() },
.{ .path = "system/services/discovery", .binary = discovery_exe.getEmittedBin() },
.{ .path = "system/services/log-flush", .binary = log_flush_exe.getEmittedBin() },
.{ .path = "system/services/logger", .binary = logger_exe.getEmittedBin() },
.{ .path = "system/drivers/ps2-bus", .binary = ps2_bus_exe.getEmittedBin() },
.{ .path = "system/drivers/ps2-keyboard", .binary = ps2_keyboard_exe.getEmittedBin() },
.{ .path = "system/drivers/ps2-mouse", .binary = ps2_mouse_exe.getEmittedBin() },