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package system
import (
"errors"
"fmt"
"os"
"slices"
"hakurei.app/system/acl"
)
// UpdatePerm calls UpdatePermType with the [Process] criteria.
func (sys *I) UpdatePerm(path string, perms ...acl.Perm) *I {
sys.UpdatePermType(Process, path, perms...)
return sys
}
// UpdatePermType maintains [acl.Perms] on a file until its [Enablement] is no longer satisfied.
func (sys *I) UpdatePermType(et Enablement, path string, perms ...acl.Perm) *I {
sys.ops = append(sys.ops, &aclUpdateOp{et, path, perms})
return sys
}
// aclUpdateOp implements [I.UpdatePermType].
type aclUpdateOp struct {
et Enablement
path string
perms acl.Perms
}
func (a *aclUpdateOp) Type() Enablement { return a.et }
func (a *aclUpdateOp) apply(sys *I) error {
sys.verbose("applying ACL", a)
return newOpError("acl", sys.aclUpdate(a.path, sys.uid, a.perms...), false)
}
func (a *aclUpdateOp) revert(sys *I, ec *Criteria) error {
if ec.hasType(a.Type()) {
sys.verbose("stripping ACL", a)
err := sys.aclUpdate(a.path, sys.uid)
if errors.Is(err, os.ErrNotExist) {
// the ACL is effectively stripped if the file no longer exists
sys.verbosef("target of ACL %s no longer exists", a)
err = nil
}
return newOpError("acl", err, true)
} else {
sys.verbose("skipping ACL", a)
return nil
}
}
func (a *aclUpdateOp) Is(o Op) bool {
target, ok := o.(*aclUpdateOp)
return ok && a != nil && target != nil &&
a.et == target.et &&
a.path == target.path &&
slices.Equal(a.perms, target.perms)
}
func (a *aclUpdateOp) Path() string { return a.path }
func (a *aclUpdateOp) String() string {
return fmt.Sprintf("%s type: %s path: %q",
a.perms, TypeString(a.et), a.path)
}
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