Sebastiaan van Stijn
678c2fde98
Commit https://github.com/moby/moby//commit/330a0035334871d92207b583c1c36d52a244753f introduced "synchronous" service update and rollback, using progress bars to show current status for each task. As part of that change, progress bars were "reversed" when doing a rollback, to indicate that status was rolled back to a previous state. Reversing direction is somewhat confusing, as progress bars now return to their "initial" state to indicate it was "completed"; for an "automatic" rollback, this may be somewhat clear (progress bars "move to the right", then "roll back" if the update failed), but when doing a manual rollback, it feels counter-intuitive (rolling back is the _expected_ outcome). This patch removes the code to reverse the direction of progress-bars, and makes progress-bars always move from left ("start") to right ("finished"). Before this patch ---------------------------------------- 1. create a service with automatic rollback on failure $ docker service create --update-failure-action=rollback --name foo --tty --replicas=5 nginx:alpine 9xi1w3mv5sqtyexsuh78qg0cb overall progress: 5 out of 5 tasks 1/5: running [==================================================>] 2/5: running [==================================================>] 3/5: running [==================================================>] 4/5: running [==================================================>] 5/5: running [==================================================>] verify: Waiting 2 seconds to verify that tasks are stable... 2. update the service, making it fail after 3 seconds $ docker service update --entrypoint="/bin/sh -c 'sleep 3; exit 1'" foo overall progress: rolling back update: 2 out of 5 tasks 1/5: running [==================================================>] 2/5: running [==================================================>] 3/5: starting [============================================> ] 4/5: running [==================================================>] 5/5: running [==================================================>] 3. Once the service starts failing, automatic rollback is started; progress-bars now move in the reverse direction; overall progress: rolling back update: 3 out of 5 tasks 1/5: ready [===========> ] 2/5: ready [===========> ] 3/5: running [> ] 4/5: running [> ] 5/5: running [> ] 4. When the rollback is completed, the progressbars are at the "start" to indicate they completed; overall progress: rolling back update: 5 out of 5 tasks 1/5: running [> ] 2/5: running [> ] 3/5: running [> ] 4/5: running [> ] 5/5: running [> ] rollback: update rolled back due to failure or early termination of task bndiu8a998agr8s6sjlg9tnrw verify: Service converged After this patch ---------------------------------------- Progress bars always go from left to right; also in a rollback situation; After updating to the "faulty" entrypoint, task are deployed: $ docker service update --entrypoint="/bin/sh -c 'sleep 3; exit 1'" foo foo overall progress: 1 out of 5 tasks 1/5: 2/5: running [==================================================>] 3/5: ready [======================================> ] 4/5: 5/5: Once tasks start failing, rollback is started, and presented the same as a regular update; progress bars go from left to right; overall progress: rolling back update: 3 out of 5 tasks 1/5: ready [======================================> ] 2/5: starting [============================================> ] 3/5: running [==================================================>] 4/5: running [==================================================>] 5/5: running [==================================================>] rollback: update rolled back due to failure or early termination of task c11dxd7ud3d5pq8g45qkb4rjx Signed-off-by: Sebastiaan van Stijn <github@gone.nl>