Plan 9 from Bell Labs’s /usr/web/sources/patch/maybe/u9fs-chroot/readme

Copyright © 2021 Plan 9 Foundation.
Distributed under the MIT License.
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This patch address two long-standing issues in u9fs:

First, use of chroot causes complications when a root is specified; chroot requires /etc/^(passwd group) and friends be copied to the new root.  This is uneccessary, and is obviated by use of a new function named rootpath.

Second, files created with a default user are owned by the user of the process rather than the default user.  This is addressed by issuing a chown after create to reinstate proper permission.

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