// Snapshot create a btrfs snapshot of a subvolume.
func Snapshot(subvolumeDir string, snapshotDir string, readonly bool) error {
// Check if the passed subvolume directory is a btrfs subvolume.
if !IsSubvolume(subvolumeDir) {
return fmt.Errorf("failed to create btrfs snapshot: the subvolume directory '%s' is not a btrfs subvolume!", subvolumeDir)
}
// The destination snapshot directory should not exist!
e, err := utils.Exists(snapshotDir)
if err != nil {
return err
} else if e {
return fmt.Errorf("failed to create btrfs snapshot: the snapshot directory '%s' already exists!", snapshotDir)
}
// Create the snapshot directory.
if readonly {
err = utils.RunCommand("btrfs", "subvolume", "snapshot", "-r", subvolumeDir, snapshotDir)
} else {
err = utils.RunCommand("btrfs", "subvolume", "snapshot", subvolumeDir, snapshotDir)
}
if err != nil {
return fmt.Errorf("failed to create btrfs snapshot '%s': %v", snapshotDir, err)
}
// Force changed blocks to disk, update the super block.
err = utils.RunCommand("sync")
if err != nil {
return fmt.Errorf("failed to force changed blocks to disk, update the super block: %v", err)
}
return nil
}
// SetSubvolumeReadonly sets the readonly flag on a btrfs subvolume.
func SetSubvolumeReadonly(subvolumeDir string, readonly bool) error {
// Run the command.
err := utils.RunCommand("btrfs", "property", "set", "-ts", subvolumeDir, "ro", strconv.FormatBool(readonly))
if err != nil {
return fmt.Errorf("failed to set readonly flag of btrfs subvolume '%s': %v", subvolumeDir, err)
}
return nil
}
// DeleteSubvolume deletes a btrfs subvolume.
func DeleteSubvolume(subvolumeDir string) error {
// Run the command.
err := utils.RunCommand("btrfs", "subvolume", "delete", subvolumeDir)
if err != nil {
return fmt.Errorf("failed to delete the btrfs subvolume '%s': %v", subvolumeDir, err)
}
return nil
}
// IsSubvolume checks if the directory is a btrfs subvolume.
func IsSubvolume(subvolumeDir string) bool {
// Run the command.
err := utils.RunCommand("btrfs", "subvolume", "show", subvolumeDir)
if err != nil {
return false
}
return true
}
// Balance a btrfs partition.
func Balance(path string) error {
// Run the command.
err := utils.RunCommand("btrfs", "fi", "balance", "start", "-dusage="+strconv.Itoa(config.Config.BtrfsBalanceDusage), path)
if err != nil {
return fmt.Errorf("failed to balance btrfs path '%s': %v", path, err)
}
return nil
}
func taskFuncCloneSource(app *App) error {
app.setState("cloning source")
// Clone the source with git.
err := utils.RunCommand("git", "clone", "-b", app.settings.Branch, "--single-branch", app.settings.SourceURL, app.SourceDirectoryPath())
if err != nil {
return fmt.Errorf("failed to clone application source with git: %v", err)
}
return nil
}