+func (ldr *Loader) setLoopbackInstanceType(cfg *arvados.Config) error {
+ for id, cc := range cfg.Clusters {
+ if !cc.Containers.CloudVMs.Enable || cc.Containers.CloudVMs.Driver != "loopback" {
+ continue
+ }
+ if len(cc.InstanceTypes) == 1 {
+ continue
+ }
+ if len(cc.InstanceTypes) > 1 {
+ return fmt.Errorf("Clusters.%s.InstanceTypes: cannot use multiple InstanceTypes with loopback driver", id)
+ }
+ // No InstanceTypes configured. Fill in implicit
+ // default.
+ hostram, err := getHostRAM()
+ if err != nil {
+ return err
+ }
+ scratch, err := getFilesystemSize(os.TempDir())
+ if err != nil {
+ return err
+ }
+ cc.InstanceTypes = arvados.InstanceTypeMap{"localhost": {
+ Name: "localhost",
+ ProviderType: "localhost",
+ VCPUs: runtime.NumCPU(),
+ RAM: hostram,
+ Scratch: scratch,
+ IncludedScratch: scratch,
+ Price: 1.0,
+ }}
+ cfg.Clusters[id] = cc
+ }
+ return nil
+}
+
+func getFilesystemSize(path string) (arvados.ByteSize, error) {
+ var stat unix.Statfs_t
+ err := unix.Statfs(path, &stat)
+ if err != nil {
+ return 0, err
+ }
+ return arvados.ByteSize(stat.Blocks * uint64(stat.Bsize)), nil
+}
+
+var reMemTotal = regexp.MustCompile(`(^|\n)MemTotal: *(\d+) kB\n`)
+
+func getHostRAM() (arvados.ByteSize, error) {
+ buf, err := os.ReadFile("/proc/meminfo")
+ if err != nil {
+ return 0, err
+ }
+ m := reMemTotal.FindSubmatch(buf)
+ if m == nil {
+ return 0, errors.New("error parsing /proc/meminfo: no MemTotal")
+ }
+ kb, err := strconv.ParseInt(string(m[2]), 10, 64)
+ if err != nil {
+ return 0, fmt.Errorf("error parsing /proc/meminfo: %q: %w", m[2], err)
+ }
+ return arvados.ByteSize(kb) * 1024, nil
+}
+