Use containers/storage/pkg/regexp in place of regexp

This is a cleaner solution and guarantees the variables
will be used before they are initialized.

[NO NEW TESTS NEEDED]

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

cmd/podman/parse/net.go

@@ -8,9 +8,9 @@ import (
 	"net"
 	"net/url"
 	"os"
-	"regexp"
 	"strings"
-	"sync"
+
+	"github.com/containers/storage/pkg/regexp"
 )
 
 const (
@@ -23,9 +23,8 @@ const (
 
 var (
 	whiteSpaces  = " \t"
-	alphaRegexp  *regexp.Regexp
-	domainRegexp *regexp.Regexp
-	onceRegex    sync.Once
+	alphaRegexp  = regexp.Delayed(`[a-zA-Z]`)
+	domainRegexp = regexp.Delayed(`^(:?(:?[a-zA-Z0-9]|(:?[a-zA-Z0-9][a-zA-Z0-9\-]*[a-zA-Z0-9]))(:?\.(:?[a-zA-Z0-9]|(:?[a-zA-Z0-9][a-zA-Z0-9\-]*[a-zA-Z0-9])))*)\.?\s*$`)
 )
 
 // validateExtraHost validates that the specified string is a valid extrahost and returns it.
@@ -54,10 +53,6 @@ func validateIPAddress(val string) (string, error) {
 }
 
 func ValidateDomain(val string) (string, error) {
-	onceRegex.Do(func() {
-		alphaRegexp = regexp.MustCompile(`[a-zA-Z]`)
-		domainRegexp = regexp.MustCompile(`^(:?(:?[a-zA-Z0-9]|(:?[a-zA-Z0-9][a-zA-Z0-9\-]*[a-zA-Z0-9]))(:?\.(:?[a-zA-Z0-9]|(:?[a-zA-Z0-9][a-zA-Z0-9\-]*[a-zA-Z0-9])))*)\.?\s*$`)
-	})
 	if alphaRegexp.FindString(val) == "" {
 		return "", fmt.Errorf("%s is not a valid domain", val)
 	}

libpod/options.go

@@ -6,9 +6,7 @@ import (
 	"net"
 	"os"
 	"path/filepath"
-	"regexp"
 	"strings"
-	"sync"
 	"syscall"
 
 	"github.com/containers/buildah/pkg/parse"
@@ -25,15 +23,13 @@ import (
 	"github.com/containers/podman/v4/pkg/util"
 	"github.com/containers/storage"
 	"github.com/containers/storage/pkg/idtools"
+	"github.com/containers/storage/pkg/regexp"
 	"github.com/opencontainers/runtime-spec/specs-go"
 	"github.com/opencontainers/runtime-tools/generate"
 	"github.com/sirupsen/logrus"
 )
 
-var (
-	umaskRegex *regexp.Regexp
-	onceRegex  sync.Once
-)
+var umaskRegex = regexp.Delayed(`^[0-7]{1,4}$`)
 
 // WithStorageConfig uses the given configuration to set up container storage.
 // If this is not specified, the system default configuration will be used
@@ -1797,9 +1793,6 @@ func WithTimezone(path string) CtrCreateOption {
 
 // WithUmask sets the umask in the container
 func WithUmask(umask string) CtrCreateOption {
-	onceRegex.Do(func() {
-		umaskRegex = regexp.MustCompile(`^[0-7]{1,4}$`)
-	})
 	return func(ctr *Container) error {
 		if ctr.valid {
 			return define.ErrCtrFinalized

pkg/bindings/images/build.go

@@ -13,11 +13,9 @@ import (
 	"net/url"
 	"os"
 	"path/filepath"
-	"regexp"
 	"runtime"
 	"strconv"
 	"strings"
-	"sync"
 
 	"github.com/containers/buildah/define"
 	"github.com/containers/image/v5/types"
@@ -26,6 +24,7 @@ import (
 	"github.com/containers/podman/v4/pkg/domain/entities"
 	"github.com/containers/storage/pkg/fileutils"
 	"github.com/containers/storage/pkg/ioutils"
+	"github.com/containers/storage/pkg/regexp"
 	"github.com/docker/go-units"
 	"github.com/hashicorp/go-multierror"
 	jsoniter "github.com/json-iterator/go"
@@ -37,17 +36,10 @@ type devino struct {
 	Ino uint64
 }
 
-var (
-	iidRegex  *regexp.Regexp
-	onceRegex sync.Once
-)
+var iidRegex = regexp.Delayed(`^[0-9a-f]{12}`)
 
 // Build creates an image using a containerfile reference
 func Build(ctx context.Context, containerFiles []string, options entities.BuildOptions) (*entities.BuildReport, error) {
-	onceRegex.Do(func() {
-		iidRegex = regexp.MustCompile(`^[0-9a-f]{12}`)
-	})
-
 	if options.CommonBuildOpts == nil {
 		options.CommonBuildOpts = new(define.CommonBuildOptions)
 	}

pkg/systemd/quadlet/quadlet.go

@@ -3,11 +3,10 @@ package quadlet
 import (
 	"fmt"
 	"path/filepath"
-	"regexp"
 	"strings"
-	"sync"
 
 	"github.com/containers/podman/v4/pkg/systemd/parser"
+	"github.com/containers/storage/pkg/regexp"
 )
 
 const (
@@ -75,8 +74,7 @@ const (
 )
 
 var (
-	onceRegex      sync.Once
-	validPortRange *regexp.Regexp
+	validPortRange = regexp.Delayed(`\d+(-\d+)?(/udp|/tcp)?$`)
 
 	// Supported keys in "Container" group
 	supportedContainerKeys = map[string]bool{
@@ -157,9 +155,6 @@ func replaceExtension(name string, extension string, extraPrefix string, extraSu
 }
 
 func isPortRange(port string) bool {
-	onceRegex.Do(func() {
-		validPortRange = regexp.MustCompile(`\d+(-\d+)?(/udp|/tcp)?$`)
-	})
 	return validPortRange.MatchString(port)
 }