feat(cli): allow specifying name of provisioner daemon (#11077)

- Adds a --name argument to provisionerd start
- Plumbs through name to integrated and external provisioners
- Defaults to hostname if not specified for external, hostname-N for integrated
- Adds cliutil.Hostname

coderd/util/strings/strings.go

@@ -17,3 +17,14 @@ func JoinWithConjunction(s []string) string {
 		s[last],
 	)
 }
+
+// Truncate returns the first n characters of s.
+func Truncate(s string, n int) string {
+	if n < 1 {
+		return ""
+	}
+	if len(s) <= n {
+		return s
+	}
+	return s[:n]
+}

coderd/util/strings/strings_test.go

@@ -14,3 +14,27 @@ func TestJoinWithConjunction(t *testing.T) {
 	require.Equal(t, "foo and bar", strings.JoinWithConjunction([]string{"foo", "bar"}))
 	require.Equal(t, "foo, bar and baz", strings.JoinWithConjunction([]string{"foo", "bar", "baz"}))
 }
+
+func TestTruncate(t *testing.T) {
+	t.Parallel()
+
+	for _, tt := range []struct {
+		s        string
+		n        int
+		expected string
+	}{
+		{"foo", 4, "foo"},
+		{"foo", 3, "foo"},
+		{"foo", 2, "fo"},
+		{"foo", 1, "f"},
+		{"foo", 0, ""},
+		{"foo", -1, ""},
+	} {
+		tt := tt
+		t.Run(tt.expected, func(t *testing.T) {
+			t.Parallel()
+			actual := strings.Truncate(tt.s, tt.n)
+			require.Equal(t, tt.expected, actual)
+		})
+	}
+}