packagr-io-beta
59 lines
1.2 KiB
Go
59 lines
1.2 KiB
Go
//
|
|
// Use and distribution licensed under the Apache license version 2.
|
|
//
|
|
// See the COPYING file in the root project directory for full text.
|
|
//
|
|
|
|
package ghw
|
|
|
|
import (
|
|
"fmt"
|
|
"io/ioutil"
|
|
"os"
|
|
"strconv"
|
|
"strings"
|
|
)
|
|
|
|
const (
|
|
disableWarningsEnv = "GHW_DISABLE_WARNINGS"
|
|
)
|
|
|
|
type closer interface {
|
|
Close() error
|
|
}
|
|
|
|
func safeClose(c closer) {
|
|
err := c.Close()
|
|
if err != nil {
|
|
_, _ = fmt.Fprintf(os.Stderr, "failed to close: %s", err)
|
|
}
|
|
}
|
|
|
|
func warn(msg string, args ...interface{}) {
|
|
if _, ok := os.LookupEnv(disableWarningsEnv); ok {
|
|
return
|
|
}
|
|
_, _ = fmt.Fprint(os.Stderr, "WARNING: ")
|
|
_, _ = fmt.Fprintf(os.Stderr, msg, args...)
|
|
}
|
|
|
|
// Reads a supplied filepath and converts the contents to an integer. Returns
|
|
// -1 if there were file permissions or existence errors or if the contents
|
|
// could not be successfully converted to an integer. In any error, a warning
|
|
// message is printed to STDERR and -1 is returned.
|
|
func safeIntFromFile(path string) int {
|
|
msg := "failed to read int from file: %s\n"
|
|
buf, err := ioutil.ReadFile(path)
|
|
if err != nil {
|
|
warn(msg, err)
|
|
return -1
|
|
}
|
|
contents := strings.TrimSpace(string(buf))
|
|
res, err := strconv.Atoi(contents)
|
|
if err != nil {
|
|
warn(msg, err)
|
|
return -1
|
|
}
|
|
return res
|
|
}
|