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ev3dev / brickstrap

Tool for bootstrapping Debian and creating bootable image files for embedded systems
MIT License
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Cannnot open tar file: Permission denied #62

Closed npkapur closed 7 years ago

npkapur commented 7 years ago

I pulled the ev3dev image from docker and installed some packages I want to have on the ev3.

I'm following the docs for creating a disk image from a docker image using brickstrap

I created an empty file /brickstrap/_tar-exclude inside the docker image to avoid issue #61. However, now I'm getting the following error when running ./brickstrap/brickstrap.sh create-tar test test.tar.

Checking docker image tar version...
tar 1.27.1-2+b1
Creating test.tar from test...
/bin/tar: /brickstrap/_tar-out/test.tar: Cannot open: Permission denied
/bin/tar: Error is not recoverable: exiting now

Any ideas?

dlech commented 7 years ago

Which image did you pull? There are something like13 ev3dev images.

I'm thinking we should probably add --user root to all of the docker commands in brickstrap.sh to ensure that we are always running as root inside of the docker image.

dlech commented 7 years ago

Also, /brickstrap/_tar-out/ is bind-mounted to the current working directory on the host computer, so you need write permissions for the directory where where you run the brickstrap command.

npkapur commented 7 years ago

I used this command:

docker pull ev3dev/debian-jessie-armel-cross

I pulled the image this morning, so I'm guessing it is the most up to date.

dlech commented 7 years ago

The ev3dev/debian-jessie-armel-cross image is for cross-compiling on a desktop system. It is not a good basis for an SD card image since it contains nearly 1GB of cross compiler programs that would be wasted space on the SD card. It is also missing a kernel and other essential packages needed to make a bootable image.

ev3dev/ev3dev-jessie-ev3-generic is the image we use to make official ev3dev releases for LEGO MINDSTORMS EV3 hardware. If you want a bare minimum image for EV3, then use ev3dev/ev3dev-jessie-ev3-base instead.

npkapur commented 7 years ago

Our goal is to install some libraries in the image so we don't have to compile our binaries statically. We'll give the base image a try. Thanks!