buildah-unshare(1) General Commands Manual buildah-unshare(1)
NAME
buildah-unshare - Run a command inside of a modified user namespace.
SYNOPSIS
buildah unshare [options] [--] [command]
DESCRIPTION
Launches a process (by default, $SHELL) in a new user namespace. The
user namespace is configured so that the invoking user's UID and primary
GID appear to be UID 0 and GID 0, respectively. Any ranges which match
that user and group in /etc/subuid and /etc/subgid are also mapped in as
themselves with the help of the newuidmap(1) and newgidmap(1) helpers.
buildah unshare is useful for troubleshooting unprivileged operations
and for manually clearing storage and other data related to images and
containers.
It is also useful if you want to use the buildah mount command. If an
unprivileged user wants to mount and work with a container, then they
need to execute buildah unshare. Executing buildah mount fails for un-
privileged users unless the user is running inside a buildah unshare
session.
OPTIONS
--mount, -m [VARIABLE=]containerNameOrID
Mount the containerNameOrID container while running command, and set the
environment variable VARIABLE to the path of the mountpoint. If VARI-
ABLE is not specified, it defaults to containerNameOrID, which may not
be a valid name for an environment variable.
EXAMPLE
buildah unshare id
buildah unshare pwd
buildah unshare cat /proc/self/uid_map /proc/self/gid_map
buildah unshare rm -fr $HOME/.local/share/containers/storage
/run/user/`id -u`/run
buildah unshare --mount containerID sh -c 'cat ${containerID}/etc/os-re-
lease'
If you want to use buildah with a mount command then you can create a
script that looks something like:
cat buildah-script.sh << _EOF
#!/bin/sh
ctr=$(buildah from scratch)
mnt=$(buildah mount $ctr)
dnf -y install --installroot=$mnt PACKAGES
dnf -y clean all --installroot=$mnt
buildah config --entrypoint="/bin/PACKAGE" --env "FOO=BAR" $ctr
buildah commit $ctr imagename
buildah unmount $ctr
_EOF
Then execute it with:
buildah unshare buildah-script.sh
SEE ALSO
buildah(1), buildah-mount(1), namespaces(7), newuidmap(1), newgidmap(1),
user_namespaces(7)
buildah June 2018 buildah-unshare(1)
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