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74 lines
2.0 KiB
Markdown
Vendored
74 lines
2.0 KiB
Markdown
Vendored
# go-billy [![GoDoc](https://godoc.org/gopkg.in/go-git/go-billy.v5?status.svg)](https://pkg.go.dev/github.com/go-git/go-billy/v5) [![Test](https://github.com/go-git/go-billy/workflows/Test/badge.svg)](https://github.com/go-git/go-billy/actions?query=workflow%3ATest)
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The missing interface filesystem abstraction for Go.
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Billy implements an interface based on the `os` standard library, allowing to develop applications without dependency on the underlying storage. Makes it virtually free to implement mocks and testing over filesystem operations.
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Billy was born as part of [go-git/go-git](https://github.com/go-git/go-git) project.
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## Installation
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```go
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import "github.com/go-git/go-billy/v5" // with go modules enabled (GO111MODULE=on or outside GOPATH)
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import "github.com/go-git/go-billy" // with go modules disabled
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```
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## Usage
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Billy exposes filesystems using the
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[`Filesystem` interface](https://pkg.go.dev/github.com/go-git/go-billy/v5?tab=doc#Filesystem).
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Each filesystem implementation gives you a `New` method, whose arguments depend on
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the implementation itself, that returns a new `Filesystem`.
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The following example caches in memory all readable files in a directory from any
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billy's filesystem implementation.
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```go
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func LoadToMemory(origin billy.Filesystem, path string) (*memory.Memory, error) {
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memory := memory.New()
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files, err := origin.ReadDir("/")
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if err != nil {
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return nil, err
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}
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for _, file := range files {
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if file.IsDir() {
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continue
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}
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src, err := origin.Open(file.Name())
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if err != nil {
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return nil, err
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}
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dst, err := memory.Create(file.Name())
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if err != nil {
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return nil, err
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}
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if _, err = io.Copy(dst, src); err != nil {
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return nil, err
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}
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if err := dst.Close(); err != nil {
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return nil, err
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}
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if err := src.Close(); err != nil {
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return nil, err
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}
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}
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return memory, nil
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}
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```
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## Why billy?
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The library billy deals with storage systems and Billy is the name of a well-known, IKEA
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bookcase. That's it.
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## License
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Apache License Version 2.0, see [LICENSE](LICENSE)
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