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XBPS-UCHROOT(1) General Commands Manual XBPS-UCHROOT(1)

XBPS utility to chroot and bind mount with Linux namespaces

xbps-uchroot [

The xbps-uchroot utility allows users to chroot and bind mount required pseudo-filesystems (/dev, /proc and /sys) in the target CHROOTDIR to execute COMMAND. The xbps-uchroot utility uses by default Linux namespaces to isolate IPC, PIDs and mounts to the calling process. If running in a OpenVZ container, these namespace features are simply disabled.

Bind mounts src into CHROOTDIR/dest. This option may be specified multiple times. Please note that both src and dest must be absolute paths and must exist.
Setups a temporary directory and then creates an overlay layer (via overlayfs) with the lowerdir set to CHROOTDIR. Useful to create a temporary tree that does not preserve changes in CHROOTDIR.
Arguments passed to the tmpfs mount, if the -O and -t options are specified. This expects the same arguments that are accepted as options in tmpfs, as explained in mount(1).
This makes the temporary directory to be mounted in tmpfs, so that everything is stored in RAM. Note that this is only useful if used with the -O option (overlayfs).

The xbps-uchroot executable must be setgid to function properly and shall only be executable by a specific group to avoid security issues (4750).

The xbps-uchroot utility uses Linux specific features (namespaces) and it's not meant to be portable to other Operating Systems. The following kernel options must be enabled:

xbps-checkvers(1), xbps-create(1), xbps-dgraph(1), xbps-fbulk(1), xbps-install(1), xbps-pkgdb(1), xbps-query(1), xbps-reconfigure(1), xbps-rindex(1), xbps-uunshare(1), xbps.d(5)

Juan Romero Pardines <>

Probably, but I try to make this not happen. Use it under your own responsibility and enjoy your life.
Report bugs at
October 28, 2015