If I have a program like this, it fails as expected (on Windows):
~~~
package main
import (
"fmt"
"os"
)
func main() {
old := "go1.16.5.src.tar.gz"
os.Open(old)
err := os.Rename(old, "new.tar.gz")
// The process cannot access the file because it is being used by
another process.
fmt.Println(err)
}
~~~
However this program succeeds:
~~~
package main
import (
"compress/gzip"
"os"
)
func main() {
old := "go1.16.5.src.tar.gz"
f, err := os.Open(old)
if err != nil {
panic(err)
}
gzip.NewReader(f)
f.Close()
os.Rename(old, "new.tar.gz")
}
~~~
even though I did not close the gzip reader. My question is: what is the
point
of closing the gzip reader? What "bad" can happen if you dont do it?
https://golang.org/pkg/compress/gzip#Reader.Close
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