memoryfs
An in-memory filesystem implementation of io/fs.FS.
memoryfs
implements all of the currently defined io/fs
interfaces:
It also allows the creation of files and directories.
Example
package main
import (
"fmt"
"io/fs"
"github.com/liamg/memoryfs"
)
func main() {
memfs := memoryfs.New()
if err := memfs.MkdirAll("my/dir", 0o700); err != nil {
panic(err)
}
if err := memfs.WriteFile("my/dir/file.txt", []byte("hello world"), 0o600); err != nil {
panic(err)
}
data, err := fs.ReadFile(memfs, "my/dir/file.txt")
if err != nil {
panic(err)
}
fmt.Println(string(data))
}
Lazy Loading
If you are mirroring a disk file-system in memory, it can become very inefficient when large files are in use. For this scenario, the WriteLazyFile method is recommended. It allows you to add a file whose content will be provided on-demand by calling the LazyOpener function.