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package idtools
import (
"fmt"
"math"
"math/bits"
"strconv"
"strings"
)
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("parsing id map value %q: %w", spec[0], err)
}
hid, err := strconv.ParseUint(spec[1], 10, 32)
if err != nil {
return 0, 0, 0, fmt.Errorf("parsing id map value %q: %w", spec[1], err)
}
sz, err := strconv.ParseUint(spec[2], 10, 32)
if err != nil {
return 0, 0, 0, fmt.Errorf("parsing id map value %q: %w", spec[2], err)
}
return uint32(cid), uint32(hid), uint32(sz), nil
}
// ParseIDMap parses idmap triples from string.
func ParseIDMap(mapSpec []string, mapSetting string) (idmap []IDMap, err error) {
stdErr := fmt.Errorf("initializing ID mappings: %s setting is malformed expected [\"uint32:uint32:uint32\"]: %q", mapSetting, mapSpec)
for _, idMapSpec := range mapSpec {
if idMapSpec == "" {
continue
}
idSpec := strings.Split(idMapSpec, ":")
if len(idSpec)%3 != 0 {
return nil, stdErr
}
for i := range idSpec {
if i%3 != 0 {
continue
}
cid, hid, size, err := parseTriple(idSpec[i : i+3])
if err != nil {
return nil, stdErr
}
// Avoid possible integer overflow on 32bit builds
if bits.UintSize == 32 && (cid > math.MaxInt32 || hid > math.MaxInt32 || size > math.MaxInt32) {
return nil, stdErr
}
mapping := IDMap{
ContainerID: int(cid),
HostID: int(hid),
Size: int(size),
}
idmap = append(idmap, mapping)
}
}
return idmap, nil
}
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