Maxim Sobolev
43b0384bc7
Add mountpoint(1), a simple utility to tell whether the file pointed to by the argument is a mount point. It prints whether it is, unless -q is given, and exits 0 if it is, 1 if it is not, and 2 on error. The answer comes from the kernel with a single stat(2): the root vnode of a mounted file system is reported with SFBSD_MNTPOINT in st_bsdflags. Unlike comparing realpath(3) of the argument with that of statfs(2)'s f_mntonname, this works for arbitrarily deep hierarchies, and after chroot(2) or inside a jail. A chroot or jail root is reported as a mount point only if it is one. The argument does not have to be a directory: file systems such as nullfs(5) can be mounted over regular files and sockets, and stat(2) reports those mount points as well. Since all that is needed is one stat(2) call, make mountpoint a hardlink to stat(1), the same way readlink(1) is, and document it in stat.1. Add ATF tests, including chroot(8) and jail(8) roots that are and are not mount points, nullfs roots, file systems mounted inside the root, both from the host and from within the jail, and a nullfs mount of a file over a file. Suggested by: kib Differential revision: https://reviews.freebsd.org/D59906 Sponsored by: Sippy Software, Inc. MFC after: 2 weeks
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| Directory | Description |
|---|---|
| bin | System/user commands. |
| cddl | Source code for third-party software under the Common Development and Distribution License. |
| contrib | Source code for third-party software. |
| crypto | Source code for cryptographic libraries and commands (see crypto/README). |
| etc | Template files for /etc. |
| include | System include files. |
| kerberos5 | Build system for Kerberos 5 (Heimdal). |
| krb5 | Build system for Kerberos 5 (MIT). |
| lib | System libraries. |
| libexec | System commands intended to be executed by other commands or daemons. |
| packages | Base system packages. |
| release | Makefiles and scripts used for building releases and VM images. |
| rescue | Build system for statically linked /rescue commands. |
| sbin | System commands. |
| secure | Build system for cryptographic libraries and commands (excluding Kerberos). |
| share | Shared resources. |
| stand | Boot loader sources. |
| sys | Kernel sources (see sys/README.md). |
| targets | Support for experimental DIRDEPS_BUILD |
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