update to go1.18, and use strings.Cut

.github/workflows/test.yml

@@ -4,7 +4,7 @@ jobs:
   test:
     strategy:
       matrix:
-        go-version: [1.17.x, 1.21.x, 1.22.x]
+        go-version: [1.18.x, 1.21.x, 1.22.x]
         platform: [ubuntu-20.04, ubuntu-22.04, ubuntu-24.04, windows-latest, macos-12, macos-14]
     runs-on: ${{ matrix.platform }}
     steps:

mount/flags_unix.go

@@ -100,14 +100,14 @@ func MergeTmpfsOptions(options []string) ([]string, error) {
 			}
 			continue
 		}
-		opt := strings.SplitN(option, "=", 2)
-		if len(opt) != 2 || !validFlags[opt[0]] {
+		opt, _, ok := strings.Cut(option, "=")
+		if !ok || !validFlags[opt] {
 			return nil, fmt.Errorf("invalid tmpfs option %q", opt)
 		}
-		if !dataCollisions[opt[0]] {
+		if !dataCollisions[opt] {
 			// We prepend the option and add to collision map
 			newOptions = append([]string{option}, newOptions...)
-			dataCollisions[opt[0]] = true
+			dataCollisions[opt] = true
 		}
 	}
 

mount/go.mod

@@ -1,6 +1,6 @@
 module github.com/moby/sys/mount
 
-go 1.17
+go 1.18
 
 require (
 	github.com/moby/sys/mountinfo v0.7.2

mount/mounter_linux_test.go

@@ -212,7 +212,8 @@ func validateMount(t *testing.T, mnt string, opts, optional, vfs string) {
 
 // clean strips off any value param after the colon
 func clean(v string) string {
-	return strings.SplitN(v, ":", 2)[0]
+	out, _, _ := strings.Cut(v, ":")
+	return out
 }
 
 // has returns true if key is a member of m

mountinfo/go.mod

@@ -1,5 +1,5 @@
 module github.com/moby/sys/mountinfo
 
-go 1.17
+go 1.18
 
 require golang.org/x/sys v0.1.0

mountinfo/mountinfo_linux.go

@@ -75,7 +75,20 @@ func GetMountsFromReader(r io.Reader, filter FilterFunc) ([]*Info, error) {
 			}
 		}
 
-		p := &Info{}
+		major, minor, ok := strings.Cut(fields[2], ":")
+		if !ok {
+			return nil, fmt.Errorf("parsing '%s' failed: unexpected major:minor pair %s", text, fields[2])
+		}
+
+		p := &Info{
+			ID:         toInt(fields[0]),
+			Parent:     toInt(fields[1]),
+			Major:      toInt(major),
+			Minor:      toInt(minor),
+			Options:    fields[5],
+			Optional:   strings.Join(fields[6:sepIdx], " "), // zero or more optional fields
+			VFSOptions: fields[sepIdx+3],
+		}
 
 		p.Mountpoint, err = unescape(fields[4])
 		if err != nil {
@@ -89,28 +102,12 @@ func GetMountsFromReader(r io.Reader, filter FilterFunc) ([]*Info, error) {
 		if err != nil {
 			return nil, fmt.Errorf("parsing '%s' failed: source: %w", fields[sepIdx+2], err)
 		}
-		p.VFSOptions = fields[sepIdx+3]
-
-		// ignore any numbers parsing errors, as there should not be any
-		p.ID, _ = strconv.Atoi(fields[0])
-		p.Parent, _ = strconv.Atoi(fields[1])
-		mm := strings.SplitN(fields[2], ":", 3)
-		if len(mm) != 2 {
-			return nil, fmt.Errorf("parsing '%s' failed: unexpected major:minor pair %s", text, mm)
-		}
-		p.Major, _ = strconv.Atoi(mm[0])
-		p.Minor, _ = strconv.Atoi(mm[1])
 
 		p.Root, err = unescape(fields[3])
 		if err != nil {
 			return nil, fmt.Errorf("parsing '%s' failed: root: %w", fields[3], err)
 		}
 
-		p.Options = fields[5]
-
-		// zero or more optional fields
-		p.Optional = strings.Join(fields[6:sepIdx], " ")
-
 		// Run the filter after parsing all fields.
 		var skip, stop bool
 		if filter != nil {
@@ -248,3 +245,10 @@ func unescape(path string) (string, error) {
 
 	return string(buf[:bufLen]), nil
 }
+
+// toInt converts a string to an int, and ignores any numbers parsing errors,
+// as there should not be any.
+func toInt(s string) int {
+	i, _ := strconv.Atoi(s)
+	return i
+}

sequential/go.mod

@@ -1,5 +1,5 @@
 module github.com/moby/sys/sequential
 
-go 1.17
+go 1.18
 
 require golang.org/x/sys v0.1.0

signal/go.mod

@@ -1,5 +1,5 @@
 module github.com/moby/sys/signal
 
-go 1.17
+go 1.18
 
 require golang.org/x/sys v0.1.0

symlink/go.mod

@@ -1,5 +1,5 @@
 module github.com/moby/sys/symlink
 
-go 1.17
+go 1.18
 
 require golang.org/x/sys v0.1.0

user/go.mod

@@ -1,5 +1,5 @@
 module github.com/moby/sys/user
 
-go 1.17
+go 1.18
 
 require golang.org/x/sys v0.1.0