112 lines
3.6 KiB
Go
112 lines
3.6 KiB
Go
/*
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Copyright The containerd Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package archive
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import (
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"archive/tar"
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"context"
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"io"
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"time"
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)
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// ApplyOptions provides additional options for an Apply operation
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type ApplyOptions struct {
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Filter Filter // Filter tar headers
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ConvertWhiteout ConvertWhiteout // Convert whiteout files
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Parents []string // Parent directories to handle inherited attributes without CoW
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NoSameOwner bool // NoSameOwner will not attempt to preserve the owner specified in the tar archive.
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applyFunc func(context.Context, string, io.Reader, ApplyOptions) (int64, error)
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}
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// ApplyOpt allows setting mutable archive apply properties on creation
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type ApplyOpt func(options *ApplyOptions) error
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// Filter specific files from the archive
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type Filter func(*tar.Header) (bool, error)
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// ConvertWhiteout converts whiteout files from the archive
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type ConvertWhiteout func(*tar.Header, string) (bool, error)
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// all allows all files
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func all(_ *tar.Header) (bool, error) {
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return true, nil
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}
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// WithFilter uses the filter to select which files are to be extracted.
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func WithFilter(f Filter) ApplyOpt {
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return func(options *ApplyOptions) error {
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options.Filter = f
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return nil
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}
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}
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// WithConvertWhiteout uses the convert function to convert the whiteout files.
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func WithConvertWhiteout(c ConvertWhiteout) ApplyOpt {
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return func(options *ApplyOptions) error {
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options.ConvertWhiteout = c
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return nil
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}
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}
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// WithNoSameOwner is same as '--no-same-owner` in 'tar' command.
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// It'll skip attempt to preserve the owner specified in the tar archive.
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func WithNoSameOwner() ApplyOpt {
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return func(options *ApplyOptions) error {
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options.NoSameOwner = true
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return nil
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}
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}
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// WithParents provides parent directories for resolving inherited attributes
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// directory from the filesystem.
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// Inherited attributes are searched from first to last, making the first
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// element in the list the most immediate parent directory.
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// NOTE: When applying to a filesystem which supports CoW, file attributes
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// should be inherited by the filesystem.
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func WithParents(p []string) ApplyOpt {
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return func(options *ApplyOptions) error {
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options.Parents = p
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return nil
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}
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}
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// WriteDiffOptions provides additional options for a WriteDiff operation
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type WriteDiffOptions struct {
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ParentLayers []string // Windows needs the full list of parent layers
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writeDiffFunc func(context.Context, io.Writer, string, string, WriteDiffOptions) error
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// SourceDateEpoch specifies the following timestamps to provide control for reproducibility.
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// - The upper bound timestamp of the diff contents
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// - The timestamp of the whiteouts
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//
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// See also https://reproducible-builds.org/docs/source-date-epoch/ .
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SourceDateEpoch *time.Time
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}
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// WriteDiffOpt allows setting mutable archive write properties on creation
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type WriteDiffOpt func(options *WriteDiffOptions) error
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// WithSourceDateEpoch specifies the SOURCE_DATE_EPOCH without touching the env vars.
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func WithSourceDateEpoch(tm *time.Time) WriteDiffOpt {
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return func(options *WriteDiffOptions) error {
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options.SourceDateEpoch = tm
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return nil
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}
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}
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