"tar" executable not found in Elasticsearch 7.15.0-SNAPSHOT Docker image

[jmlrt]

Elasticsearch version (bin/elasticsearch --version): 7.15.0-SNAPSHOT, Build: default/docker/bc278d661f0b0d72ce292aa636fbb1db96427c40/2021-08-17T13:27:20.599610018Z, JVM: 16.0.2

OS version (uname -a if on a Unix-like system): Linux 658e2dc4afe5 4.4.0-185-generic #215-Ubuntu SMP Mon Jun 8 21:53:19 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

Description of the problem including expected versus actual behavior: tar command is not found in the Docker image

Steps to reproduce:

➜  ~ docker run -it docker.elastic.co/elasticsearch/elasticsearch:7.15.0-SNAPSHOT bash
bash-4.4# tar
bash: tar: command not found

Can also be reproduced while trying to do a kubectl cp into an Elasticsearch pod (kubectl cp command require tar binary in the container):

➜  ~ kubectl get pod elasticsearch-master-0                                        
NAME                     READY   STATUS    RESTARTS   AGE
elasticsearch-master-0   1/1     Running   0          24m
➜  ~ kubectl get pod elasticsearch-master-0 -o json | jq '.spec.containers[].image'
"docker.elastic.co/elasticsearch/elasticsearch:7.15.0-SNAPSHOT"
➜  ~ touch foo                                                                     
➜  ~ kubectl cp foo elasticsearch-master-0:/tmp/foo                 
OCI runtime exec failed: exec failed: container_linux.go:349: starting container process caused "exec: \"tar\": executable file not found in $PATH": unknown
command terminated with exit code 126

Note that tar command is present in the other images, examples:

➜  ~ docker run -it docker.elastic.co/elasticsearch/elasticsearch:7.14.0 tar --version
tar (GNU tar) 1.30
Copyright (C) 2017 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Written by John Gilmore and Jay Fenlason.
➜  ~ docker run -it docker.elastic.co/elasticsearch/elasticsearch:7.14.1-SNAPSHOT tar --version
tar (GNU tar) 1.30
Copyright (C) 2017 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Written by John Gilmore and Jay Fenlason.
➜  ~ docker run -it docker.elastic.co/elasticsearch/elasticsearch:8.0.0-SNAPSHOT tar --version
tar (GNU tar) 1.30
Copyright (C) 2017 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Written by John Gilmore and Jay Fenlason.

cc @elastic/es-delivery

[pugnascotia]

@jmlrt what are you doing with the image that requires tar?

[jmlrt]

@jmlrt what are you doing with the image that requires tar?

Our Helm charts tests required that we copy a file in the container using kubectl cp.
It seems that kubectl cp command is using internally the tar binary which should be present in the container (see kubernetes/kubernetes#58512 feature request to stop depending of tar for kubectl cp).

[pugnascotia]

...wow. OK, I'll add that in.

[mark-vieira]

This was closed by #76696