3e47cdf70f
applyFunc now takes an io.Reader instead of a tar.Reader because I'm trying to mirror the API of the not-yet-exposed implementation of this same behaviour in github.com/Microsoft/hcsshim/internal/ociwclayer, with an eye to later moving to that implementation it is ever exposed. Signed-off-by: Paul "TBBle" Hampson <Paul.Hampson@Pobox.com>
76 lines
2.3 KiB
Go
76 lines
2.3 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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)
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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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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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// 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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