Helpers for supporting kando location push and pull using Kopia

[pavannd1]

Change Overview

• Utility function to find the kopia repo object ID of the backed up stream
• Helpers to create kopia snapshot and read a snapshot
• Kando location push and pull functions with kopia

Pull request type

Please check the type of change your PR introduces:

• 🚧 Work in Progress
• 🌈 Refactoring (no functional changes, no api changes)
• 🐹 Trivial/Minor
• 🐛 Bugfix
• 🌻 Feature
• 🗺️ Documentation
• 🤖 Test

Issues

• #XXX

Test Plan

• 💪 Manual
• ⚡ Unit test
• 💚 E2E

[PrasadG193]

probably should use --backup-id flag

[PrasadG193]

I've also observed that kando location pull with kopia doesn't work if we pass absolute path as a target. We can fix that in the followups

[PrasadG193]

Failing due to lint checks

Status: Downloaded newer image for ghcr.io/kanisterio/build:v0.0.12
Running golangci-lint...
pkg/kando/location_pull.go:47:6: `backupIDFlag` is unused (deadcode)
func backupIDFlag(cmd *cobra.Command) string {
     ^
pkg/kando/location_pull.go:77:6: `kopiaLocationPull` is unused (deadcode)
func kopiaLocationPull(ctx context.Context, backupID, path string, target io.Writer) error {
     ^
pkg/kando/location_push.go:79:6: `kopiaLocationPush` is unused (deadcode)
func kopiaLocationPush(ctx context.Context, path string, source io.Reader) error {
     ^

We can add exceptions for now