mirror of https://github.com/vbatts/go-mtree.git
55 lines
1.9 KiB
Go
55 lines
1.9 KiB
Go
package mtree
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import "os"
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// FsEval is a mock-friendly method of specifying to go-mtree how to carry out
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// filesystem operations such as opening files and the like. The semantics of
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// all of these wrappers MUST be identical to the semantics described here.
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type FsEval interface {
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// Open must have the same semantics as os.Open.
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Open(path string) (*os.File, error)
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// Lstat must have the same semantics as os.Lstat.
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Lstat(path string) (os.FileInfo, error)
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// Readdir must have the same semantics as calling os.Open on the given
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// path and then returning the result of (*os.File).Readdir(-1).
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Readdir(path string) ([]os.FileInfo, error)
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// KeywordFunc must return a wrapper around the provided function (in other
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// words, the returned function must refer to the same keyword).
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KeywordFunc(fn KeywordFunc) KeywordFunc
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}
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// DefaultFsEval is the default implementation of FsEval (and is the default
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// used if a nil interface is passed to any mtree function). It does not modify
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// or wrap any of the methods (they all just call out to os.*).
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type DefaultFsEval struct{}
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// Open must have the same semantics as os.Open.
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func (fs DefaultFsEval) Open(path string) (*os.File, error) {
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return os.Open(path)
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}
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// Lstat must have the same semantics as os.Lstat.
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func (fs DefaultFsEval) Lstat(path string) (os.FileInfo, error) {
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return os.Lstat(path)
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}
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// Readdir must have the same semantics as calling os.Open on the given
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// path and then returning the result of (*os.File).Readdir(-1).
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func (fs DefaultFsEval) Readdir(path string) ([]os.FileInfo, error) {
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fh, err := os.Open(path)
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if err != nil {
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return nil, err
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}
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defer fh.Close()
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return fh.Readdir(-1)
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}
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// KeywordFunc must return a wrapper around the provided function (in other
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// words, the returned function must refer to the same keyword).
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func (fs DefaultFsEval) KeywordFunc(fn KeywordFunc) KeywordFunc {
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return fn
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}
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