reorg: move test fixtures to test/system/services (source + boot volume)

The 11 QEMU-suite fixtures lived mixed into system/services/ with their binaries bundled at /system/tests/<name>. Now the repo path is the boot path, like every real service: test/system/services/<name>. fat-test moves out of the fat server's directory into its own; display-demo stays a boot service. - kernel VFS: setInitialRamdisk derives one read-only initrd mount per top-level tree named by the ramdisk entry paths (/system, /test), registers ancestors generically with self-parented roots, and refuses backend shadowing of any initrd tree - EFI loader: the fallback walk also enumerates \test (optional — a volume without fixtures still boots); manifest and capsule unchanged - path literals: vfs-test self-open + create probe, process-test process_enumerate matches, the args-echo argv[0] expectation; the kvfs case now covers the /test root end to end - docs: DFHS /test rows, tree diagrams, loader prose, and the location convention gain the third home; fixed the input-source link 100/100 QEMU cases pass.
2026-07-23 00:11:07 +01:00
parent b9cec7d1be
commit f023f1cfd6
24 changed files with 150 additions and 108 deletions
@@ -0,0 +1,91 @@
+//! /test/system/services/vfs-test — a ring-3 client that proves the kernel VFS
+//! end to end through the plain `file_system` API: resolve its OWN binary under
+//! the kernel-served /test mount, check its metadata, read its ELF magic, and
+//! list /system/services. On success it heartbeats "vfstest: ok" so the kernel
+//! test can observe it; on failure it reports what went wrong.
+//!
+//! The "park" role (the fat-client-death test): open a file on the FAT volume,
+//! then hold the handle forever without closing — the kill and the fat
+//! server's release-on-death sweep are the point.
+
+const std = @import("std");
+const fs = @import("file-system");
+const process = @import("process");
+const time = @import("time");
+const logging = @import("logging");
+
+pub fn main(init: process.Init) void {
+    if (init.arguments.count > 1) {
+        park();
+        return;
+    }
+
+    // Our own binary, resolved through the kernel mount table.
+    const self_path = "/test/system/services/vfs-test";
+    var file = fs.open(self_path, .{}) orelse {
+        _ = logging.write("vfstest: open of own binary failed\n");
+        return;
+    };
+    defer file.close();
+
+    const attributes = file.attributes() orelse {
+        _ = logging.write("vfstest: attributes failed\n");
+        return;
+    };
+    if (attributes.kind != .regular or attributes.size == 0) {
+        _ = logging.write("vfstest: bad attributes\n");
+        return;
+    }
+
+    var header: [4]u8 = undefined;
+    const n = file.read(&header) orelse 0;
+    if (n != 4 or header[0] != 0x7f or header[1] != 'E' or header[2] != 'L' or header[3] != 'F') {
+        _ = logging.write("vfstest: ELF magic mismatch\n");
+        return;
+    }
+
+    // The write refusal: the initrd trees are read-only by construction.
+    if (file.write("x") != null or fs.open("/test/system/services/new-file", .{ .create = true }) != null) {
+        _ = logging.write("vfstest: the initrd tree accepted a write\n");
+        return;
+    }
+
+    // Listing: /system/services contains init.
+    var saw_init = false;
+    if (fs.openDirectory("/system/services")) |listing| {
+        var directory = listing;
+        defer directory.close();
+        var entry: fs.Entry = .{};
+        while (directory.next(&entry)) {
+            if (std.mem.eql(u8, entry.name(), "init")) saw_init = true;
+        }
+    }
+    if (!saw_init) {
+        _ = logging.write("vfstest: /system/services listing missed init\n");
+        return;
+    }
+
+    while (true) {
+        _ = logging.write("vfstest: ok\n");
+        time.sleepMillis(1000);
+    }
+}
+
+fn park() void {
+    // The storage chain (usb -> block -> fat -> mounts) takes a few seconds;
+    // retry until the volume appears.
+    var parked: ?fs.File = null;
+    var tries: u32 = 0;
+    while (parked == null and tries < 1000) : (tries += 1) {
+        parked = fs.open("/mnt/usb/parked", .{ .create = true });
+        if (parked == null) time.sleepMillis(20);
+    }
+    if (parked == null) {
+        _ = logging.write("vfstest: park open failed\n");
+        return;
+    }
+    while (true) {
+        _ = logging.write("vfstest: parked\n");
+        time.sleepMillis(500);
+    }
+}