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63abdc1138
introduce a new xattr "user.fuseoverlayfs.override_stat" that permit to override the reported uid/gid/mode for lower layers. It enables sharing storage among different users. Since it is not possible to use "user.*" xattrs for symlinks, provide also a privileged variant "security.fuseoverlayfs.override_stat", so the root user can create the xattr for symlinks as well. A script "fix-mode.py" is provided for converting an existing layer/storage to the new model. It is a destructive operation as every file is converted to mode 0755, thus it is not usable anymore with native overlay, or older versions of fuse-overlayfs. Example with Podman: Rootless: Modify /.config/containers/storage.conf and add under storage.options: additionalimagestores = ["/var/lib/shared-storage"] Assuming an empty local storage for the user: $ podman images REPOSITORY TAG IMAGE ID CREATED SIZE ReadOnly docker.io/library/fedora latest a368cbcfa678 5 weeks ago 189 MB true and the files show the original mode and owner: $ podman run --read-only --rm -ti docker.io/library/fedora ls -l / lrwxrwxrwx. 1 root root 7 Jan 28 2020 bin -> usr/bin dr-xr-xr-x. 2 root root 6 Jan 28 2020 boot drwxr-xr-x. 5 root root 360 Aug 15 13:26 dev drwxr-xr-x. 41 root root 4096 Jul 9 06:48 etc drwxr-xr-x. 2 root root 6 Jan 28 2020 home lrwxrwxrwx. 1 root root 7 Jan 28 2020 lib -> usr/lib lrwxrwxrwx. 1 root root 9 Jan 28 2020 lib64 -> usr/lib64 drwx------. 2 root root 6 Jul 9 06:48 lost+found drwxr-xr-x. 2 root root 6 Jan 28 2020 media drwxr-xr-x. 2 root root 6 Jan 28 2020 mnt drwxr-xr-x. 2 root root 6 Jan 28 2020 opt dr-xr-xr-x. 436 nobody nobody 0 Aug 15 13:26 proc dr-xr-x---. 2 root root 196 Jul 9 06:48 root drwxrwxrwt. 3 root root 80 Aug 15 13:26 run lrwxrwxrwx. 1 root root 8 Jan 28 2020 sbin -> usr/sbin drwxr-xr-x. 2 root root 6 Jan 28 2020 srv dr-xr-xr-x. 13 nobody nobody 0 Aug 5 21:38 sys drwxrwxrwt. 2 root root 60 Aug 15 13:26 tmp drwxr-xr-x. 12 root root 144 Jul 9 06:48 usr drwxr-xr-x. 18 root root 235 Jul 9 06:48 var Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>