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Use storage that better supports rootless overlayfs
overlayfs -- the kernel's version, not fuse-overlayfs -- recently learned (as of linux 5.16.0, I believe) how to support rootless users. Previously, rootless users had to use these storage.conf(5) settings: * storage.driver=vfs (aka STORAGE_DRIVER=vfs), or * storage.driver=overlay (aka STORAGE_DRIVER=overlay), storage.options.overlay.mount_program=/usr/bin/fuse-overlayfs (aka STORAGE_OPTS=/usr/bin/fuse-overlayfs) Now that a third backend is available, setting only: * storage.driver=overlay (aka STORAGE_DRIVER=overlay) containers#13123 reported EXDEV errors during the normal operation of their container. Tracing it out, the problem turned out to be that their container was being mounted without 'userxattr'; I don't fully understand why, but mount(8) mentions this is needed for rootless users: > userxattr > > Use the "user.overlay." xattr namespace instead of "trusted.overlay.". > This is useful for unprivileged mounting of overlayfs. containers/storage#1156 found and fixed the issue in podman, and this just pulls in that via go get github.com/containers/storage@ebc90ab go mod vendor make vendor Closes containers#13123 Signed-off-by: Nick Guenther <nick.guenther@polymtl.ca>
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