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98 lines
2.5 KiB
Go
98 lines
2.5 KiB
Go
package platformtest
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import (
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"context"
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"fmt"
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"os"
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"path/filepath"
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"github.com/pkg/errors"
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"github.com/zrepl/zrepl/zfs"
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)
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type Zpool struct {
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args ZpoolCreateArgs
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}
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type ZpoolCreateArgs struct {
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PoolName string
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ImagePath string
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ImageSize int64
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Mountpoint string
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}
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func (a ZpoolCreateArgs) Validate() error {
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if !filepath.IsAbs(a.ImagePath) {
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return errors.Errorf("ImagePath must be absolute, got %q", a.ImagePath)
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}
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const minImageSize = 1024
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if a.ImageSize < minImageSize {
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return errors.Errorf("ImageSize must be > %v, got %v", minImageSize, a.ImageSize)
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}
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if a.Mountpoint == "" || a.Mountpoint[0] != '/' {
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return errors.Errorf("Mountpoint must be an absolute path to a directory")
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}
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if a.PoolName == "" {
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return errors.Errorf("PoolName must not be empty")
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}
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return nil
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}
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func CreateOrReplaceZpool(ctx context.Context, e Execer, args ZpoolCreateArgs) (*Zpool, error) {
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if err := args.Validate(); err != nil {
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return nil, errors.Wrap(err, "zpool create args validation error")
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}
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// export pool if it already exists (idempotence)
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if _, err := zfs.ZFSGetRawAnySource(args.PoolName, []string{"name"}); err != nil {
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if _, ok := err.(*zfs.DatasetDoesNotExist); ok {
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// we'll create it shortly
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} else {
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return nil, errors.Wrapf(err, "cannot determine whether test pool %q exists", args.PoolName)
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}
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} else {
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// exists, export it, OpenFile will destroy it
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if err := e.RunExpectSuccessNoOutput(ctx, "zpool", "export", args.PoolName); err != nil {
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return nil, errors.Wrapf(err, "cannot destroy test pool %q", args.PoolName)
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}
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}
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// idempotently (re)create the pool image
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image, err := os.OpenFile(args.ImagePath, os.O_CREATE|os.O_RDWR, 0600)
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if err != nil {
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return nil, errors.Wrap(err, "create image file")
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}
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defer image.Close()
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if err := image.Truncate(args.ImageSize); err != nil {
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return nil, errors.Wrap(err, "create image: truncate")
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}
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image.Close()
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// create the pool
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err = e.RunExpectSuccessNoOutput(ctx, "zpool", "create", "-f",
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"-O", fmt.Sprintf("mountpoint=%s", args.Mountpoint),
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args.PoolName, args.ImagePath,
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)
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if err != nil {
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return nil, errors.Wrap(err, "zpool create")
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}
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return &Zpool{args}, nil
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}
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func (p *Zpool) Name() string { return p.args.PoolName }
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func (p *Zpool) Destroy(ctx context.Context, e Execer) error {
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if err := e.RunExpectSuccessNoOutput(ctx, "zpool", "export", p.args.PoolName); err != nil {
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return errors.Wrapf(err, "export pool %q", p.args.PoolName)
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}
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if err := os.Remove(p.args.ImagePath); err != nil {
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return errors.Wrapf(err, "remove pool image")
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}
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return nil
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}
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