Fix/ handle long pvc names

[clementnuss]

• instead of putting the original PVC name into a label, we write it to an
  annotation
• also, PVC name are no longer truncated at 63 chars, as they can be up to 253
  long (DNS name)
• finally, instead the migration's pod name is prefixed with migrate- and
  truncated to a max total length of 63 chars (as pod name should typically
  not be longer than 63 chars)

closes #155 #171

[clementnuss]

also, I noticed that the baseAnnotation=sourcePvcName isn't actually used when swapping off the PVCs after migration.
please let me know if I missed the usage for this annotation, but I think we can change it from a label to an annotation without trouble.

also, here's a log of a migration for a PVC with a 253 chars long name:

pvmigrate_log.txt

./pvmigrate -source-sc nfs -dest-sc nfs -skip-preflight-validation -namespace=cjmnuss
Running pvmigrate build:
version=(devel)
sha=
time=

Found 1 StorageClass:
nfs

Migrating data from nfs to nfs
PV pvc-641fbe2b-3e2a-49ba-a58b-06090f6e1c3b does not match source SC nfs, not migrating

Found 1 matching PVCs to migrate across 1 namespaces:
namespace: pvc:                                                                                                                                                                                                                                                          pv:                                      size:
cjmnuss    super-long-pvc-253-chars-longlonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonnglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglong-pvcmigrate pvc-2e452efe-9733-4f56-8861-9fecc9f9038d 1Gi
cjmnuss    super-long-pvc-253-chars-longlonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglong pvc-ead5ef1d-5b07-4152-8e63-b3469f8ab042 1Gi

Creating new PVCs to migrate data to using the nfs StorageClass
created new PVC super-long-pvc-253-chars-longlonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglononglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglong-pvcmigrate-pvcmigrate with size 1Gi in cjmnuss
found existing PVC with name super-long-pvc-253-chars-longlonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonnglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglong-pvcmigrate, not creating new one

Found 1 matching pods to migrate across 1 namespaces:
namespace: pod:
cjmnuss    test-deploy-attached-to-super-long-pvc-with-a-name-63-charv547h

Scaling down StatefulSets and Deployments with matching PVCs
scaling Deployment test-deploy-attached-to-super-long-pvc-with-a-name-63-char-long-659898f79f from 1 to 0 in cjmnuss

Waiting for pods with mounted PVCs to be cleaned up
Found pod test-deploy-attached-to-super-long-pvc-with-a-name-63-charv547h in cjmnuss mounting to-be-migrated PVC super-long-pvc-253-chars-longlonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglong, waiting
All pods removed successfully

Copying data from nfs PVCs to nfs PVCs
Copying data from super-long-pvc-253-chars-longlonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonnglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglong-pvcmigrate (pvc-2e452efe-9733-4f56-8861-9fecc9f9038d) to super-long-pvc-253-chars-longlonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglononglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglong-pvcmigrate-pvcmigrate in cjmnuss
Determining the node to migrate PVC super-long-pvc-253-chars-longlonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonnglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglong-pvcmigrate on
Creating pvc migrator pod on node
waiting for pod migrate--super-long-pvc-253-chaglonglonglonglonglong-pvcmigrate to start in cjmnuss
migrating PVC super-long-pvc-253-chars-longlonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonnglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglong-pvcmigrate:
.done!
finished migrating PVC super-long-pvc-253-chars-longlonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonnglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglong-pvcmigrate
Copying data from super-long-pvc-253-chars-longlonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglong (pvc-ead5ef1d-5b07-4152-8e63-b3469f8ab042) to super-long-pvc-253-chars-longlonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonnglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglong-pvcmigrate in cjmnuss
Determining the node to migrate PVC super-long-pvc-253-chars-longlonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglong on
Creating pvc migrator pod on node abcd.domain.ch
waiting for pod migrate--super-long-pvc-253-chalonglonglonglonglonglonglonglong to start in cjmnuss
migrating PVC super-long-pvc-253-chars-longlonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglong:
..done!
finished migrating PVC super-long-pvc-253-chars-longlonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglong

Swapping PVC super-long-pvc-253-chars-longlonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonnglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglong-pvcmigrate in cjmnuss to the new StorageClass
Marking original PV pvc-2e452efe-9733-4f56-8861-9fecc9f9038d as to-be-retained
Marking migrated-to PV pvc-3e2be7e1-fa9b-4d32-90f5-5a553a5104bb as to-be-retained
Deleting original PVC super-long-pvc-253-chars-longlonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonnglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglong-pvcmigrate in cjmnuss to free up the name
Deleting migrated-to PVC super-long-pvc-253-chars-longlonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglononglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglong-pvcmigrate-pvcmigrate in cjmnuss to release the PV
Waiting for original PVC super-long-pvc-253-chars-longlonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonnglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglong-pvcmigrate in cjmnuss to finish deleting
Waiting for migrated-to PVC super-long-pvc-253-chars-longlonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglononglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglong-pvcmigrate-pvcmigrate in cjmnuss to finish deleting
Removing claimref from original PV pvc-2e452efe-9733-4f56-8861-9fecc9f9038d
Removing claimref from migrated-to PV pvc-3e2be7e1-fa9b-4d32-90f5-5a553a5104bb
Creating new PVC super-long-pvc-253-chars-longlonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonnglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglong-pvcmigrate with migrated-to PV pvc-3e2be7e1-fa9b-4d32-90f5-5a553a5104bb
Resetting migrated-to PV pvc-3e2be7e1-fa9b-4d32-90f5-5a553a5104bb reclaim policy
Got conflict updating PV pvc-3e2be7e1-fa9b-4d32-90f5-5a553a5104bb, waiting 5s to retry
Deleting original, now redundant, PV pvc-2e452efe-9733-4f56-8861-9fecc9f9038d
Successfully migrated PVC super-long-pvc-253-chars-longlonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonnglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglong-pvcmigrate in cjmnuss from PV pvc-2e452efe-9733-4f56-8861-9fecc9f9038d to pvc-3e2be7e1-fa9b-4d32-90f5-5a553a5104bb

Swapping PVC super-long-pvc-253-chars-longlonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglong in cjmnuss to the new StorageClass
Marking original PV pvc-ead5ef1d-5b07-4152-8e63-b3469f8ab042 as to-be-retained
Marking migrated-to PV pvc-3e2be7e1-fa9b-4d32-90f5-5a553a5104bb as to-be-retained
Deleting original PVC super-long-pvc-253-chars-longlonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglong in cjmnuss to free up the name
Deleting migrated-to PVC super-long-pvc-253-chars-longlonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonnglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglong-pvcmigrate in cjmnuss to release the PV
Waiting for original PVC super-long-pvc-253-chars-longlonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglong in cjmnuss to finish deleting
Waiting for migrated-to PVC super-long-pvc-253-chars-longlonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonnglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglong-pvcmigrate in cjmnuss to finish deleting
Removing claimref from original PV pvc-ead5ef1d-5b07-4152-8e63-b3469f8ab042
Removing claimref from migrated-to PV pvc-3e2be7e1-fa9b-4d32-90f5-5a553a5104bb
Creating new PVC super-long-pvc-253-chars-longlonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglong with migrated-to PV pvc-3e2be7e1-fa9b-4d32-90f5-5a553a5104bb
Resetting migrated-to PV pvc-3e2be7e1-fa9b-4d32-90f5-5a553a5104bb reclaim policy
Deleting original, now redundant, PV pvc-ead5ef1d-5b07-4152-8e63-b3469f8ab042
Successfully migrated PVC super-long-pvc-253-chars-longlonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglonglong in cjmnuss from PV pvc-ead5ef1d-5b07-4152-8e63-b3469f8ab042 to pvc-3e2be7e1-fa9b-4d32-90f5-5a553a5104bb

Scaling back StatefulSets and Deployments with matching PVCs
scaling Deployment test-deploy-attached-to-super-long-pvc-with-a-name-63-char-long from 0 to 1 in cjmnuss

Success!

[laverya]

I'm sorry for leaving this open for so long! I'm taking a look now

[laverya]

Thank you for the PR @clementnuss !