Yaml file won't interpret backslashes correctly

General Discussions
1

Cluster information:

Kubernetes version: 1.17.0
Cloud being used: bare-metal
Installation method: apt-get?
Host OS: Debian 10
CNI and version: flannel:v0.11.0
CRI and version:

I am trying to develop a cron job that takes this rsync command:
“find /data/high-res/ -cmin +20 -printf %P\0 | rsync -zarvhO --remove-source-files --files-from=- --from0 /data/high-res/ /mnt/high-res/”

As of now, I am trying to pass it as an args in a kubernetes manifest file

            args:
            - /bin/sh
            - -c
            -  "find /data/high-res/ -cmin +20 -printf %P\\0 | rsync -zarvhO --remove-source-files --files-from=- --from0 /data/high-res/ /mnt/high-res/"

Kubernetes interprets the
printf %P\\0
as
printf %P\0.

If I add another backslash as an escape character, i.e.
%P\\\0,
then it gets interpreted as
find /data/high-res/ -cmin +20 -printf %P\ | rsync -zarvhO --remove-source-files --files-from=- --from0 /data/high-res/ /mnt/high-res/

What is the proper way to format the command so that it gets interpreted correctly?

I am attaching the entire yaml file below

apiVersion: batch/v1beta1
kind: CronJob
metadata:
  name: highres-rsync-cronjob

spec:
  schedule: "*/1 * * * *"
  concurrencyPolicy: Replace
  startingDeadlineSeconds: 10
  failedJobsHistoryLimit: 1
  successfulJobsHistoryLimit: 3
  jobTemplate:
    spec:
      template:
        spec:
          containers:
          - name: rsync-cronjob
            image: raphaelcdm/highres-rsync-cronjob:v0.1.0
            #            command: ["/bin/sh", "-c", "find /data/high-res/ -cmin +20 -printf %P\\\0 \ | rsync -zarvhO --remove-source-files --files-from=- --from0 /data/high-res/ /mnt/high-res/ --exclude '*_1.egg'"]
            args:
            - /bin/sh
            - -c
            -  "find /data/high-res/ -cmin +20 -printf %P\\0 | rsync -zarvhO --remove-source-files --files-from=- --from0 /data/high-res/ /mnt/high-res/"
            volumeMounts:
              - name: local-storage
                mountPath: /data/
              - name: nfs-volume
                mountPath: /mnt/
          nodeSelector:
            nfs_backup: ok
          tolerations:
            - key: is_fast_daq
              operator: Exists
              effect: NoSchedule
          restartPolicy: OnFailure
          volumes: 
          - name: local-storage
            hostPath:
              path: /data
              type: Directory
          - name: nfs-volume
            nfs:
              server: some.ip.address
              path: /data

As a clarification: I am trying to implement this solution for my rsync needs: https://superuser.com/questions/1105059/how-to-rsync-files-older-than-x-min-on-linux

2

Did you try escaping both backslashes like this?

P\\\\0

Kind regards,
Stephen

2 Likes
3

Thank you @stephendotcarter!

1 Like