linux-user-chroot8
Safely allow normal users to chroot
Usage
linux-user-chroot [--unshare-ipc]
[--unshare-pid]
[--unshare-net]
[--mount-proc
DIR]
[--mount-readonly
DIR]
[--mount-bind
SOURCE
DEST]
[--chdir
DIR]
ROOTDIR
PROGRAM
ARGS ...
Overview
linux-user-chroot is a tool meant for building software in a clean environment. The user needs to create a directory tree with the build dependencies needed, and only those, and then linux-user-chroot runs the actual build commands such that the commands only see the directory tree. This is useful for ensuring the build gets the right version of its build dependencies, for example.
linux-user-chroot works similary to chroot(8), but does not require the caller to have root privileges. It uses Linux containers to restrict the chroot to make this safe. The command run inside the chroot is run as the calling user, not as root.
linux-user-chroot executes a command, and sets the root directory for the command to the directory specified by the user (ROOTDIR). Additionally, it creates a "nosuid" bind mount over the root filesystem, to prevent the build from gaining privileges using setuid binaries. The command can further be restricted from accessing the network, and it can be set up with new process ID and SysV IPC namespaces.
Options
--mount-procDIR-
Mount the proc filesystem at DIR.
--mount-readonlyDIR-
Make DIR be read-only for the command.
--mount-bindSOURCE DEST-
Add a bind mount while the command is executing.
--chdirDIR-
After setting the new root directory for the command, change the current working directory to be DIR.
Exit status
The exit status is the exit status of the executed command, or 1 if linux-user-chroot failed to execute the command.
Examples
To build software in the real system, but without networking:
-
linux-user-chroot --unshare-net --chdir "$(pwd)" make clean all check