IMO, tools invoking `sudo` automatically is a huge anti-pattern.
Require this to be opt-in.
In practice also...these tests really want to be *integration*
and not unit tests because involving `sudo` alongside uninstalled
binaries just creates a giant mess.
Closes: https://github.com/ostreedev/ostree/issues/2761
This prevents writing content into 'bare-split-xattrs` repository,
while carving some space for experimenting via a temporary
`OSTREE_EXP_WRITE_BARE_SPLIT_XATTRS` environment flag.
Colin Walters
Luca BRUNO