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package capabilities
import (
"fmt"
"strings"
"sync"
"github.com/moby/sys/capability"
)
// CapValid checks whether a capability is valid. If hostSpecific is set,
// it also checks that the capability is supported on the current host.
func CapValid(c string, hostSpecific bool) error {
if !strings.HasPrefix(c, "CAP_") {
return fmt.Errorf("capability %s must start with CAP_", c)
}
if _, ok := knownCaps()[c]; !ok {
return fmt.Errorf("invalid capability: %s", c)
}
if !hostSpecific {
return nil
}
if _, ok := supportedCaps()[c]; !ok {
return fmt.Errorf("%s is not supported on the current host", c)
}
return nil
}
func capSet(list []capability.Cap) map[string]struct{} {
m := make(map[string]struct{}, len(list))
for _, c := range list {
m["CAP_"+strings.ToUpper(c.String())] = struct{}{}
}
return m
}
var knownCaps = sync.OnceValue(func() map[string]struct{} {
return capSet(capability.ListKnown())
})
var supportedCaps = sync.OnceValue(func() map[string]struct{} {
list, _ := capability.ListSupported()
return capSet(list)
})
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