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// Copyright 2018 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package gofer
import (
"syscall"
"gvisor.dev/gvisor/pkg/context"
"gvisor.dev/gvisor/pkg/p9"
"gvisor.dev/gvisor/pkg/sentry/fs"
ktime "gvisor.dev/gvisor/pkg/sentry/kernel/time"
)
func utimes(ctx context.Context, file contextFile, ts fs.TimeSpec) error {
if ts.ATimeOmit && ts.MTimeOmit {
return nil
}
// Replace requests to use the "system time" with the current time to
// ensure that timestamps remain consistent with the remote
// filesystem.
now := ktime.NowFromContext(ctx)
if ts.ATimeSetSystemTime {
ts.ATime = now
}
if ts.MTimeSetSystemTime {
ts.MTime = now
}
mask := p9.SetAttrMask{
ATime: !ts.ATimeOmit,
ATimeNotSystemTime: true,
MTime: !ts.MTimeOmit,
MTimeNotSystemTime: true,
}
as, ans := ts.ATime.Unix()
ms, mns := ts.MTime.Unix()
attr := p9.SetAttr{
ATimeSeconds: uint64(as),
ATimeNanoSeconds: uint64(ans),
MTimeSeconds: uint64(ms),
MTimeNanoSeconds: uint64(mns),
}
// 9p2000.L SetAttr: "If a time bit is set without the corresponding SET bit,
// the current system time on the server is used instead of the value sent
// in the request."
return file.setAttr(ctx, mask, attr)
}
func openFlagsFromPerms(p fs.PermMask) (p9.OpenFlags, error) {
switch {
case p.Read && p.Write:
return p9.ReadWrite, nil
case p.Write:
return p9.WriteOnly, nil
case p.Read:
return p9.ReadOnly, nil
default:
return 0, syscall.EINVAL
}
}
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