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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2021 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 disks
import (
"fmt"
"strconv"
"strings"
"github.com/snapcore/snapd/osutil"
)
func blockdevSizeCmd(cmd, devpath string) (uint64, error) {
out, stderr, err := osutil.RunSplitOutput("blockdev", cmd, devpath)
if err != nil {
return 0, osutil.OutputErrCombine(out, stderr, err)
}
nospace := strings.TrimSpace(string(out))
sz, err := strconv.ParseUint(nospace, 10, 64)
if err != nil {
return 0, fmt.Errorf("cannot parse blockdev %s result size %q: %v", cmd, nospace, err)
}
return sz, nil
}
func blockDeviceSize(devpath string) (uint64, error) {
return blockdevSizeCmd("--getsize64", devpath)
}
func blockDeviceSectorSize(devpath string) (uint64, error) {
// the size is reported in raw bytes
sz, err := blockdevSizeCmd("--getss", devpath)
if err != nil {
return 0, err
}
if sz == 0 {
// in some other places we are using the sector size as a divisor (to
// convert from bytes to sectors), so it's essential that 0 is treated
// as an error
return 0, fmt.Errorf("internal error: sector size returned as 0")
}
return sz, nil
}
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