1buildah-unshare(1)          General Commands Manual         buildah-unshare(1)
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NAME

6       buildah-unshare - Run a command inside of a modified user namespace.
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SYNOPSIS

10       buildah unshare [options] [--] [command]
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DESCRIPTION

14       Launches  a  process (by default, $SHELL) in a new user namespace.  The
15       user namespace is configured so that the invoking user's UID  and  pri‐
16       mary  GID appear to be UID 0 and GID 0, respectively.  Any ranges which
17       match that user and group  in  /etc/subuid  and  /etc/subgid  are  also
18       mapped  in  as  themselves  with  the  help  of  the  newuidmap(1)  and
19       newgidmap(1) helpers.
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22       buildah unshare is useful for troubleshooting  unprivileged  operations
23       and  for manually clearing storage and other data related to images and
24       containers.
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27       It is also useful if you want to use the buildah mount command.  If  an
28       unprivileged  user  wants to mount and work with a container, then they
29       need to execute buildah unshare.  Executing buildah mount fails for un‐
30       privileged  users  unless  the user is running inside a buildah unshare
31       session.
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OPTIONS

35       --mount, -m [VARIABLE=]containerNameOrID
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38       Mount the containerNameOrID container while running  command,  and  set
39       the  environment  variable  VARIABLE to the path of the mountpoint.  If
40       VARIABLE is not specified, it defaults to containerNameOrID, which  may
41       not be a valid name for an environment variable.
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EXAMPLE

45       buildah unshare id
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48       buildah unshare pwd
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51       buildah unshare cat /proc/self/uid_map /proc/self/gid_map
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54       buildah    unshare    rm    -fr   $HOME/.local/share/containers/storage
55       /run/user/`id -u`/run
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58       buildah unshare --mount containerID sh -c  'cat  ${containerID}/etc/os-
59       release'
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62       If  you  want to use buildah with a mount command then you can create a
63       script that looks something like:
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66              cat buildah-script.sh << _EOF
67              #!/bin/sh
68              ctr=$(buildah from scratch)
69              mnt=$(buildah mount $ctr)
70              dnf -y install --installroot=$mnt PACKAGES
71              dnf -y clean all --installroot=$mnt
72              buildah config --entrypoint="/bin/PACKAGE" --env "FOO=BAR" $ctr
73              buildah commit $ctr imagename
74              buildah unmount $ctr
75              _EOF
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79       Then execute it with:
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82              buildah unshare buildah-script.sh
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SEE ALSO

87       buildah(1),     buildah-mount(1),     namespaces(7),      newuidmap(1),
88       newgidmap(1), user_namespaces(7)
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92buildah                            June 2018                buildah-unshare(1)
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