当我绑定文件系统根时它可以工作
~> bwrap --ro-bind / / -- which which
/usr/bin/which
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但是当我绑定非 root 时它会失败
~> bwrap --ro-bind /usr /usr -- which which
bwrap: execvp which: No such file or directory
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尽管/usr/bin/which是在/usr.
为什么会失败?