Rollback command

[edudobay]

Depends on having a deployment log (#20).

Constraints:

• Will yield an error if no previous deployment exists.
• If the build for the previous deployment does not exist, we cannot do a strict rollback.
  • One possibility is to fail unless the --allow-rebuild option is given; then the build will be re-run against the original git commit.
  • We could instead fail and tell the user what they should do instead:

    Build for previous deployment is no longer available. If you want to rebuild it, run

    simple-git-deploy deploy --ref-name NAME_OF_PREVIOUS_REF \
      --ref COMMIT_REF` \
      --message "Rollback to new build for deployment DEPLOYMENT_ID"
    

  • If the original git commit does not exist anymore, this cannot succeed in any way.

Questions

• Do we need to have special procedures for undoing a deployment?
  • I believe we can live without that; it probably would make our process too complex.