Cannot build multi-stage Dockerfile with nested COPY paths

[jokajak]

Actual behavior Using a multi-stage dockerfile where a nested path of one copied directory is copied between stages causes the build to fail.

# /kaniko/executor --dockerfile Dockerfile --context . --no-push
INFO[0000] Resolved base name alpine:3.11 to base
INFO[0000] Resolved base name alpine:3.11 to toplevel_copy
INFO[0000] Resolved base name alpine:3.11 to nested_copy
INFO[0000] Retrieving image manifest alpine:3.11
INFO[0000] Retrieving image alpine:3.11 from registry index.docker.io
INFO[0000] Retrieving image manifest alpine:3.11
INFO[0000] Returning cached image manifest
INFO[0000] Retrieving image manifest alpine:3.11
INFO[0000] Returning cached image manifest
INFO[0000] Built cross stage deps: map[0:[/top_level/ /top_level/nested]]
INFO[0000] Retrieving image manifest alpine:3.11
INFO[0000] Returning cached image manifest
INFO[0000] Executing 0 build triggers
INFO[0000] Unpacking rootfs as cmd RUN mkdir -p /top_level/nested requires it.
INFO[0000] RUN mkdir -p /top_level/nested
INFO[0000] Taking snapshot of full filesystem...
INFO[0000] cmd: /bin/sh
INFO[0000] args: [-c mkdir -p /top_level/nested]
INFO[0000] Running: [/bin/sh -c mkdir -p /top_level/nested]
INFO[0000] Taking snapshot of full filesystem...
INFO[0000] RUN echo my_dest /top_level/nested/target
INFO[0000] cmd: /bin/sh
INFO[0000] args: [-c echo my_dest /top_level/nested/target]
INFO[0000] Running: [/bin/sh -c echo my_dest /top_level/nested/target]
my_dest /top_level/nested/target
INFO[0000] Taking snapshot of full filesystem...
INFO[0000] No files were changed, appending empty layer to config. No layer added to image.
INFO[0000] RUN ln -s /top_level/nested/target /top_level/nested/my_link
INFO[0000] cmd: /bin/sh
INFO[0000] args: [-c ln -s /top_level/nested/target /top_level/nested/my_link]
INFO[0000] Running: [/bin/sh -c ln -s /top_level/nested/target /top_level/nested/my_link]
INFO[0000] Taking snapshot of full filesystem...
INFO[0000] Saving file top_level for later use
INFO[0000] Saving file top_level/nested for later use
error building image: could not save file: symlink /top_level/nested/target /kaniko/0/top_level/nested/my_link: file exists

Expected behavior Both paths should be copy-able between stages

To Reproduce Steps to reproduce the behavior:

1. Try to build the included Dockerfile

Additional Information

• Dockerfile

RUN mkdir -p /top_level/nested
RUN echo my_dest /top_level/nested/target
RUN ln -s /top_level/nested/target /top_level/nested/my_link
FROM alpine:3.11 AS toplevel_copy
COPY --from=base /top_level/ /top_level/
FROM alpine:3.11 AS nested_copy
COPY --from=base /top_level/nested /top_level/nested

• Build Context N/A

• Kaniko Image (fully qualified with digest)

  • gcr.io/kaniko-project/executor:debug Digest: sha256:fcccd2ab9f3892e33fc7f2e950c8e4fc665e7a4c66f6a9d70b300d7a2103592f

  Triage Notes for the Maintainers

  Description	Yes/No
  Please check if this a new feature you are proposing	- [ ]
  Please check if the build works in docker but not in kaniko	- [x]
  Please check if this error is seen when you use --cache flag	- [ ]
  Please check if your dockerfile is a multistage dockerfile	- [x]

[Tien-Jellyfish]

I got the same issue with the nested COPY path.

[Mistic92]

In 1.9.1 still the same issue

[matutter]

I just ran into this on 1.11.0