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How do you copy files to your Docker image during built while configuring permissions as well?

Experience Level: Senior
Tags: Docker

Answer

All new files and directories are created with a UID and GID of 0, unless the optional --chown flag specifies a given username, groupname, or UID/GID combination to request specific ownership of the copied content. The format of the --chown flag allows for either username and groupname strings or direct integer UID and GID in any combination. Providing a username without groupname or a UID without GID will use the same numeric UID as the GID. If a username or groupname is provided, the container’s root filesystem /etc/passwd and /etc/group files will be used to perform the translation from name to integer UID or GID respectively. The following examples show valid definitions for the --chown flag:

COPY --chown=55:mygroup files* /somedir/
COPY --chown=bin files* /somedir/
COPY --chown=1 files* /somedir/
COPY --chown=10:11 files* /somedir/

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