Add tests for localtime overlay and make configurable

localtime overlay can now be configured with a "localtime" tag.

Signed-off-by: Jonathon Anderson <janderson@ciq.com>

overlays/localtime/internal/localtime_test.go

@@ -0,0 +1,56 @@
+package localtime
+
+import (
+	"bytes"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/warewulf/warewulf/internal/app/wwctl/overlay/show"
+	"github.com/warewulf/warewulf/internal/pkg/config"
+	"github.com/warewulf/warewulf/internal/pkg/testenv"
+	"github.com/warewulf/warewulf/internal/pkg/wwlog"
+)
+
+func Test_localtimeOverlay(t *testing.T) {
+	env := testenv.New(t)
+	defer env.RemoveAll(t)
+	env.ImportFile(t, "etc/warewulf/nodes.conf", "nodes.conf")
+	assert.NoError(t, config.Get().Read(env.GetPath("etc/warewulf/warewulf.conf")))
+	env.ImportFile(t, "var/lib/warewulf/overlays/localtime/rootfs/etc/localtime.ww", "../rootfs/etc/localtime.ww")
+
+	tests := []struct {
+		name string
+		args []string
+		log  string
+	}{
+		{
+			name: "/etc/localtime",
+			args: []string{"--render", "node1", "localtime", "etc/localtime.ww"},
+			log:  localtime,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			cmd := show.GetCommand()
+			cmd.SetArgs(tt.args)
+			stdout := bytes.NewBufferString("")
+			stderr := bytes.NewBufferString("")
+			logbuf := bytes.NewBufferString("")
+			cmd.SetOut(stdout)
+			cmd.SetErr(stderr)
+			wwlog.SetLogWriter(logbuf)
+			err := cmd.Execute()
+			assert.NoError(t, err)
+			assert.Empty(t, stdout.String())
+			assert.Empty(t, stderr.String())
+			assert.Equal(t, tt.log, logbuf.String())
+		})
+	}
+}
+
+const localtime string = `backupFile: true
+writeFile: true
+Filename: etc/localtime
+{{ /* softlink "/usr/share/zoneinfo/GMT" */ }}
+`

overlays/localtime/internal/nodes.conf

@@ -0,0 +1,4 @@
+nodes:
+  node1:
+    tags:
+      localtime: "GMT"

overlays/localtime/rootfs/etc/localtime.ww

@@ -1 +1 @@
-{{ ImportLink "/etc/localtime" }}
+{{ if .Tags.localtime }}{{ printf "%s/%s" "/usr/share/zoneinfo" .Tags.localtime | softlink }}{{ else }}{{ ImportLink "/etc/localtime" }}{{ end }}