Vendor in containers/storage

Signed-off-by: TomSweeneyRedHat <tsweeney@redhat.com>

vendor/github.com/containers/storage/pkg/idtools/parser.go

@@ -0,0 +1,56 @@
+package idtools
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+)
+
+func nonDigitsToWhitespace(r rune) rune {
+	if !strings.ContainsRune("0123456789", r) {
+		return ' '
+	}
+	return r
+}
+
+func parseTriple(spec []string) (container, host, size uint32, err error) {
+	cid, err := strconv.ParseUint(spec[0], 10, 32)
+	if err != nil {
+		return 0, 0, 0, fmt.Errorf("error parsing id map value %q: %v", spec[0], err)
+	}
+	hid, err := strconv.ParseUint(spec[1], 10, 32)
+	if err != nil {
+		return 0, 0, 0, fmt.Errorf("error parsing id map value %q: %v", spec[1], err)
+	}
+	sz, err := strconv.ParseUint(spec[2], 10, 32)
+	if err != nil {
+		return 0, 0, 0, fmt.Errorf("error parsing id map value %q: %v", spec[2], err)
+	}
+	return uint32(cid), uint32(hid), uint32(sz), nil
+}
+
+// ParseIDMap parses idmap triples from string.
+func ParseIDMap(idMapSpec, mapSetting string) (idmap []IDMap, err error) {
+	if len(idMapSpec) > 0 {
+		idSpec := strings.Fields(strings.Map(nonDigitsToWhitespace, idMapSpec))
+		if len(idSpec)%3 != 0 {
+			return nil, fmt.Errorf("error initializing ID mappings: %s setting is malformed", mapSetting)
+		}
+		for i := range idSpec {
+			if i%3 != 0 {
+				continue
+			}
+			cid, hid, size, err := parseTriple(idSpec[i : i+3])
+			if err != nil {
+				return nil, fmt.Errorf("error initializing ID mappings: %s setting is malformed", mapSetting)
+			}
+			mapping := IDMap{
+				ContainerID: int(cid),
+				HostID:      int(hid),
+				Size:        int(size),
+			}
+			idmap = append(idmap, mapping)
+		}
+	}
+	return idmap, nil
+}