From SailfishOS Documentation
   usage: /srv/mer/sdks/sfossdk/mer-sdk-chroot [-u <user>] [-m <all|none|root|home>] [-r <SDK root path>] [<command> <args> ..]
          /srv/mer/sdks/sfossdk/mer-sdk-chroot -h

      This is the Mer chroot SDK.
      For information see

     If command is not present,
        used to enter the SDK and begin working. The SDK bash shell is a
        login shell. See below for .profile handling
        Must be preceded by a 'mount' to setup the SDK.
        May be used in multiple terminals and simply enters the

     If command is present,
        used to execute an arbitrary command from within the SDK chroot
        environment. The environment variable MERSDK is set to 1 to allow
        SDK detection.


      -u  System user to link into SDK (not needed if using sudo)
      -m  Devices to bind mount from host: none, all (default)
          root, home
      -r The root of the SDK to use - normally derived from the
         pathname of /srv/mer/sdks/sfossdk/mer-sdk-chroot
      -h  Show this help


     Entering the SDK runs the user's normal .profile and any (SDK)
     system profile entries. It will not execute the host's system
     profile entries.

     The environment variable MERSDK is set to 1 to allow .profile to
     detect the SDK.

     If the user has a ~/.mersdk.profile then it is sourced after the
     normal .profile handling (this allows the common use case of
     setting a profile to be handled).


     If the user specified has a .mersdkrc in their /root, it will be
     sourced to allow hook functions to be defined. Hooks are run as
     root. No commands should be executed immediately.

     These hooks are usually used to define symbolic links from any
     /parentroot/data type filesystems into the SDK root to setup
     system specific shared caches or filesystem layouts etc