podman/docs/source/markdown/options/userns-uid-map.md

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####> This option file is used in:
####> podman build, farm build
####> If file is edited, make sure the changes
####> are applicable to all of those.
#### **--userns-uid-map**=*mapping*
Directly specifies a UID mapping to be used to set ownership, at the
filesystem level, on the working container's contents.
Commands run when handling `RUN` instructions default to being run in
their own user namespaces, configured using the UID and GID maps.
Entries in this map take the form of one or more triples of a starting
in-container UID, a corresponding starting host-level UID, and the number of consecutive IDs which the map entry represents.
This option overrides the *remap-uids* setting in the *options* section of /etc/containers/storage.conf.
If this option is not specified, but a global --userns-uid-map setting is supplied, settings from the global option is used.
If none of --userns-uid-map-user, --userns-gid-map-group, or --userns-uid-map are specified, but --userns-gid-map is specified, the UID map is set to use the same numeric values as the GID map.