1.8 KiB
helper functions
you can find useful helper functions in libdevuansdk/zlibs/helpers. they are
intended to help you with writing wrappers, as well as making my job easier
within developing libdevuansdk. some of these functions are required for
libdevuansdk to properly work as well.
build_image_dist()
this function is kind of a wrapper function, mostly used in arm-sdk to build a
complete "dd-able" image from start to end. to run, it requires $arch,
$size, $parted_type, $workdir, and $strapdir to be declared. as well as
$parted_root, $parted_boot if $parted_type=dos, or $gpt_root,
$gpt_boot if $parted_type=gpt. see creating_wrappers(7) for insight on
these variables.
the workflow of this function is bootstrapping a complete rootfs, creating a raw image, installing/compiling a kernel, rsyncing everything to the raw image, and finally, compressing the raw image.
devprocsys()
this function is a simple helper function that takes two arguments: watdo and
werdo. it mounts or umounts /sys, /dev, /dev/pts, and procfs where you
tell it to. for example:
devprocsys mount $strapdir
devprocsys umount $strapdir
findloopmapp()
this functions takes the raw image and finds a free loopdevice for it to be
mounted. it calls losetup(8) and kpartx(8).
qemu_install_user()
helper function to install the userspace qemu to $strapdir.
dpkgdivert()
this one takes two arguments, watdo and werdo (much like devprocsys). it
will create a dpkg diversion in the place you tell it to and remove invoke-rc.d
so that apt doesn't autostart daemons when they are installed.
enablessh()
this function will allow root login with password in the bootstrapped rootfs.
silly()
a funny function printing out random messages.