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| 1 | +//go:build !go1.21 |
| 2 | + |
| 3 | +// Copyright (c) 2009 The Go Authors. All rights reserved. |
| 4 | +// |
| 5 | +// Redistribution and use in source and binary forms, with or without |
| 6 | +// modification, are permitted provided that the following conditions are |
| 7 | +// met: |
| 8 | +// |
| 9 | +// - Redistributions of source code must retain the above copyright |
| 10 | +// |
| 11 | +// notice, this list of conditions and the following disclaimer. |
| 12 | +// - Redistributions in binary form must reproduce the above |
| 13 | +// |
| 14 | +// copyright notice, this list of conditions and the following disclaimer |
| 15 | +// in the documentation and/or other materials provided with the |
| 16 | +// distribution. |
| 17 | +// - Neither the name of Google Inc. nor the names of its |
| 18 | +// |
| 19 | +// contributors may be used to endorse or promote products derived from |
| 20 | +// this software without specific prior written permission. |
| 21 | +// |
| 22 | +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 23 | +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 24 | +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 25 | +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 26 | +// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 27 | +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 28 | +// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 29 | +// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 30 | +// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 31 | +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 32 | +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 33 | +// |
| 34 | +// Source: https://cs.opensource.google/go/go/+/refs/tags/go1.21.1:src/context/context.go |
| 35 | +// The only modifications to the original source were: |
| 36 | +// - replacing the usage of internal reflectlite with reflect |
| 37 | +// - replacing the usage of private value function with Value method call |
| 38 | +package compatcontext // import "github.com/docker/docker/internal/compatcontext" |
| 39 | + |
| 40 | +import ( |
| 41 | + "context" |
| 42 | + "reflect" |
| 43 | + "time" |
| 44 | +) |
| 45 | + |
| 46 | +// WithoutCancel returns a copy of parent that is not canceled when parent is canceled. |
| 47 | +// The returned context returns no Deadline or Err, and its Done channel is nil. |
| 48 | +// Calling [Cause] on the returned context returns nil. |
| 49 | +func WithoutCancel(parent context.Context) context.Context { |
| 50 | + if parent == nil { |
| 51 | + panic("cannot create context from nil parent") |
| 52 | + } |
| 53 | + return withoutCancelCtx{parent} |
| 54 | +} |
| 55 | + |
| 56 | +type withoutCancelCtx struct { |
| 57 | + c context.Context |
| 58 | +} |
| 59 | + |
| 60 | +func (withoutCancelCtx) Deadline() (deadline time.Time, ok bool) { |
| 61 | + return |
| 62 | +} |
| 63 | + |
| 64 | +func (withoutCancelCtx) Done() <-chan struct{} { |
| 65 | + return nil |
| 66 | +} |
| 67 | + |
| 68 | +func (withoutCancelCtx) Err() error { |
| 69 | + return nil |
| 70 | +} |
| 71 | + |
| 72 | +func (c withoutCancelCtx) Value(key any) any { |
| 73 | + return c.c.Value(key) |
| 74 | +} |
| 75 | + |
| 76 | +func (c withoutCancelCtx) String() string { |
| 77 | + return contextName(c.c) + ".WithoutCancel" |
| 78 | +} |
| 79 | + |
| 80 | +type stringer interface { |
| 81 | + String() string |
| 82 | +} |
| 83 | + |
| 84 | +func contextName(c context.Context) string { |
| 85 | + if s, ok := c.(stringer); ok { |
| 86 | + return s.String() |
| 87 | + } |
| 88 | + return reflect.TypeOf(c).String() |
| 89 | +} |
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