101 lines
2.4 KiB
Go
101 lines
2.4 KiB
Go
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// Copyright 2015 CoreOS, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package system
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import (
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"bufio"
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"bytes"
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"fmt"
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"io"
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"log"
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"os"
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"os/exec"
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"strings"
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"github.com/vtolstov/go-ioctl"
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)
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func ResizeRootFS() error {
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var err error
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var stdout io.ReadCloser
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var stdin bytes.Buffer
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output, err := exec.Command("findmnt", "-n", "-o", "source", "/").CombinedOutput()
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if err != nil {
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return err
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}
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mountpoint := strings.TrimSpace(string(output))
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partstart := "2048"
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device := mountpoint[:len(mountpoint)-1]
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partition := mountpoint[len(mountpoint)-1:]
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cmd := exec.Command("fdisk", "-l", "-u", device)
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stdout, err = cmd.StdoutPipe()
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if err != nil {
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log.Printf("failed to open %s via fdisk %s 2\n", device, err.Error())
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return err
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}
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r := bufio.NewReader(stdout)
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if err = cmd.Start(); err != nil {
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log.Printf("failed to open %s via fdisk %s 3\n", device, err.Error())
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return err
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}
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for {
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line, err := r.ReadString('\n')
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if err != nil {
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break
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}
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if strings.HasPrefix(line, device+partition) {
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ps := strings.Fields(line) // /dev/sda1 * 4096 251658239 125827072 83 Linux
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if ps[1] == "*" {
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partstart = ps[2]
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} else {
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partstart = ps[1]
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}
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}
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}
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if err = cmd.Wait(); err != nil || partstart == "" {
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return fmt.Errorf("failed to open %s via fdisk 4\n", device)
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}
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stdin.Write([]byte("o\nn\np\n1\n" + partstart + "\n\na\n1\nw\n"))
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cmd = exec.Command("fdisk", "-u", device)
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cmd.Stdin = &stdin
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cmd.Run()
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stdin.Reset()
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w, err := os.OpenFile(device, os.O_WRONLY, 0600)
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if err == nil {
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defer w.Close()
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err = ioctl.BlkRRPart(w.Fd())
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if err == nil {
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return exec.Command("resize2fs", device+partition).Run()
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}
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}
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for _, name := range []string{"partprobe", "kpartx"} {
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if _, err = exec.LookPath(name); err == nil {
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if err = exec.Command(name, device).Run(); err == nil {
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return nil
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}
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}
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}
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return exec.Command("resize2fs", device+partition).Run()
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}
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