42 lines
1.1 KiB
Go
42 lines
1.1 KiB
Go
package filesystems
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import (
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"fmt"
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"regexp"
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"strings"
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)
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var (
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ext2fsSuccessRegexp = regexp.MustCompile(`The filesystem on [/a-z0-9]+ is now \d+ \(\d+\w+\) blocks long.`)
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)
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const (
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ext2 = "ext2"
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ext3 = "ext3"
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ext4 = "ext4"
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resize2fs = "resize2fs"
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)
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//Ext234Resize implements the FilesystemResizer interface for the ext4/3/2fs.
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type Ext234Resize struct {
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}
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// CanResizeFilesystem checks whether Ext234Resize can resize this filesystem.
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func (c *Ext234Resize) CanResizeFilesystem(fstype string) bool {
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return fstype == ext2 || fstype == ext3 || fstype == ext4
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}
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// ResizeFilesystem calls resize2fs to resize the filesystem if necessary.
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func (c *Ext234Resize) ResizeFilesystem(deviceName string, commandExecutor func(cmd string) (out string, err error)) error {
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command := fmt.Sprintf("%s %s 2>&1", resize2fs, deviceName)
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out, err := commandExecutor(command)
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if err != nil {
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return err
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}
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if strings.Contains(out, "Nothing to do") ||
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(strings.Contains(out, "on-line resizing required") && ext2fsSuccessRegexp.MatchString(out)) {
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return nil
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}
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return fmt.Errorf("unrecognized output: %q, assuming error", out)
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}
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