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localclean.go
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localclean.go
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package main
import (
"errors"
"flag"
"fmt"
"os"
"path/filepath"
"regexp"
)
var rxGoArchive = regexp.MustCompile(`^(go\d+(?:\.\d+)*(?:(?:rc|beta|alpha)\d+)?\.\D[^-]*-.+)\.(?:zip|tar\.gz)$`)
// localClean removes download cache.
func localClean(fs *flag.FlagSet, args []string) error {
var root string
var dryrun bool
var all bool
fs.StringVar(&root, "root", envGoupRoot(), "root dir to install")
fs.BoolVar(&dryrun, "dryrun", false, "don't switch, just test")
fs.BoolVar(&all, "all", false, "clean all caches")
if err := fs.Parse(args); err != nil {
return err
}
if root == "" {
fs.PrintDefaults()
return errors.New("required -root")
}
dldir := filepath.Join(root, "dl")
filist, err := os.ReadDir(dldir)
if err != nil {
return err
}
for _, fi := range filist {
m := rxGoArchive.FindStringSubmatch(fi.Name())
if m == nil {
continue
}
if !all {
// check the install dir existing or not.
_, err := os.Stat(filepath.Join(root, m[1]))
if err == nil {
// existing
continue
}
if !os.IsNotExist(err) {
// general I/O error
return err
}
// not found
}
name := filepath.Join(dldir, fi.Name())
if dryrun {
fmt.Printf("%s will be deleted\n", name)
continue
}
err := os.RemoveAll(name)
if err != nil {
return err
}
}
return nil
}