H-21: the manifest invokes revision (none-yet) and withheld, and config view-waits-minutes

The long-form invokes entry is read by mesh-sdk's second reader release (09d6070e): packaging's manifest
tests pass with it placed and fail before it is joined.

Builds: design 47 G §558, §617, §633, §635

cmd/mesh-host/ownname_test.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"context"
+	"os"
 	"path/filepath"
 	"strings"
 	"testing"
@@ -54,3 +55,23 @@ func TestTheEnginesOwnNameIsReadFromItsAppliedRecordOrItsFirstComposing(t *testi
 		t.Fatal("the writer was never made after the name was known")
 	}
 }
+
+// §633: the engine's bound for the first seat list is the file the manifest's `view-waits-minutes` feeds, five minutes
+// when it holds nothing usable.
+func TestTheViewWaitsBoundIsTheManifestsSetting(t *testing.T) {
+	was := viewWaitsFile
+	defer func() { viewWaitsFile = was }()
+	for content, want := range map[string]time.Duration{"2\n": 2 * time.Minute, "": 5 * time.Minute, "0": 5 * time.Minute, "x": 5 * time.Minute} {
+		viewWaitsFile = filepath.Join(t.TempDir(), "w")
+		if err := os.WriteFile(viewWaitsFile, []byte(content), 0o644); err != nil {
+			t.Fatal(err)
+		}
+		if got := viewWaitsBound(); got != want {
+			t.Errorf("the file %q gives %v, want %v", content, got, want)
+		}
+	}
+	viewWaitsFile = filepath.Join(t.TempDir(), "missing")
+	if got := viewWaitsBound(); got != 5*time.Minute {
+		t.Errorf("no file gives %v", got)
+	}
+}

cmd/mesh-host/seatlist.go

@@ -5,6 +5,8 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"os"
+	"strconv"
 	"strings"
 	"sync"
 	"sync/atomic"
@@ -163,7 +165,7 @@ func startSeatList(ctx context.Context, session *link.Session, node string, find
 		return nil, fmt.Errorf("the node-engine cannot follow the seat list: %w", err)
 	}
 	st.reader = reader
-	st.waiter = &seatwait.Waiter{Node: node, ObserverOf: findings.observer, Reader: reader, Writer: findings, Ctx: ctx,
+	st.waiter = &seatwait.Waiter{Node: node, ObserverOf: findings.observer, Reader: reader, Writer: findings, Ctx: ctx, Bound: viewWaitsBound(),
 		Clock: seatWaitClock, Say: say}
 	told := func() {
 		st.waiter.Changed()
@@ -259,3 +261,21 @@ func (f *lateFindings) Held() []condseat.Finding {
 	}
 	return nil
 }
+
+// viewWaitsFile is the file the manifest declares with the content ${config:view-waits-minutes} (design 47 G §633), read at
+// the engine's start as recoveryWaitFile is.
+var viewWaitsFile = "/var/lib/mesh-host/view-waits-minutes"
+
+// viewWaitsBound is how long the reader of the seat list may wait before the engine says it: the file's minutes, the design's
+// five (seatwait.Bound) when the file is missing, empty or not a positive number.
+func viewWaitsBound() time.Duration {
+	raw, err := os.ReadFile(viewWaitsFile)
+	if err != nil {
+		return seatwait.Bound
+	}
+	n, err := strconv.Atoi(strings.TrimSpace(string(raw)))
+	if err != nil || n <= 0 {
+		return seatwait.Bound
+	}
+	return time.Duration(n) * time.Minute
+}