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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2020 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package osutil
import (
"fmt"
"syscall"
"github.com/snapcore/snapd/strutil"
)
var syscallStatfs = syscall.Statfs
type NotEnoughDiskSpaceError struct {
Path string
Delta int64
}
func (e *NotEnoughDiskSpaceError) Error() string {
return fmt.Sprintf("insufficient space in %q, at least %s more is required", e.Path, strutil.SizeToStr(e.Delta))
}
// diskFree returns free disk space for the given path
func diskFree(path string) (uint64, error) {
var st syscall.Statfs_t
if err := syscallStatfs(path, &st); err != nil {
return 0, err
}
// available blocks * block size
return st.Bavail * uint64(st.Bsize), nil
}
// CheckFreeSpace checks if there is enough disk space for the given path
func CheckFreeSpace(path string, minSize uint64) error {
free, err := diskFree(path)
if err != nil {
return err
}
if free < minSize {
delta := int64(minSize - free)
return &NotEnoughDiskSpaceError{Path: path, Delta: delta}
}
return nil
}
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