Golang : Find file size(disk usage) with filepath.Walk
Need to determine which file is taking up all the disk space? Maybe this small Golang program can be useful to you. The purpose of this small Golang program is to find out how much space a file occupies in a given target directory.
package main
import (
"fmt"
"os"
)
// function to return the disk usage information
func diskUsage(currentPath string, info os.FileInfo) int64 {
size := info.Size()
if !info.IsDir() {
return size
}
dir, err := os.Open(currentPath)
if err != nil {
fmt.Println(err)
return size
}
defer dir.Close()
files, err := dir.Readdir(-1)
if err != nil {
fmt.Println(err)
os.Exit(1)
}
for _, file := range files {
if file.Name() == "." || file.Name() == ".." {
continue
}
size += diskUsage(currentPath+"/"+file.Name(), file)
}
fmt.Printf("Size in bytes : [%d] : [%s]\n", size, currentPath)
return size
}
func main() {
if len(os.Args) != 2 {
fmt.Printf("USAGE : %s <target_directory> \n", os.Args[0])
os.Exit(0)
}
dir := os.Args[1] // get the target directory
info, err := os.Lstat(dir)
if err != nil {
fmt.Println(err)
os.Exit(1)
}
diskUsage(dir, info)
}
Sample output :
$ ./diskusage /Users/ | more
Size in bytes : [68] : [/Users//Shared/SC Info]
Size in bytes : [204] : [/Users//Shared]
Size in bytes : [139] : [/Users//sweetlogic/.atom/.apm]
Size in bytes : [402] : [/Users//sweetlogic/.atom/compile-cache/coffee]
Size in bytes : [895] : [/Users//sweetlogic/.atom/compile-cache/cson]
See also : Golang : Read directory content with filepath.Walk()
By Adam Ng
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