n1k0 / safefile

Go package safefile implements safe "atomic" saving of files.

safefile

Go package safefile implements safe "atomic" saving of files.

Instead of truncating and overwriting the destination file, it creates a temporary file in the same directory, writes to it, and then renames the temporary file to the original name on close.

Installation

$ go get github.com/dchest/safefile

Documentation

http://godoc.org/github.com/dchest/safefile

Example

 f, err := safefile.Create("/home/ken/report.txt")
 if err != nil {
 	// ...
 }
 // Created temporary file /home/ken/133a7876287381fa-0.tmp

 _, err = io.WriteString(f, "Hello world")
 if err != nil {
 	// ...
 }
 // Wrote "Hello world" to /home/ken/133a7876287381fa-0.tmp

 err = f.Close()
 if err != nil {
     // ...
     // Due to close error, temporary file removed.
     // ...
 }
 // Renamed /home/ken/133a7876287381fa-0.tmp to /home/ken/report.txt