Simple wrappers around Docker etc. for fully isolated build environments
Project- and build-oriented tool for working with Docker images and containers
What’s the point of this tool?
Docker is great for building isolated environments for builds or applications. For my tastes, however, there are a few usability issues associated with it:
The commands are fiddly to use and difficult to remember
Docker containers run as root by default resulting in files created on the host as the root user, instead of the current user
It’s too easy to leave intermediate images and containers lying around
Note that this is a very personal list of perceived shortcomings. If these aren’t issues for you, then don’t use this tool!
IBT makes Docker images and containers more development- and project-focused. It encourages the following workflows:
Editing of source files is carried out predominantly on the host machine
Building, running and debugging of targets is always carried out within the Docker container
Source code will typically be under the control of a VCS such as Git
Source files should not be copied en masse into the container
Output files from builds etc. should be exposed directly to the host
You’ll notice that the commands strongly resemble those of Vagrant. This is not completely accidental. The workflows described above strongly resemble Vagrant workflows where up, destroy, run correspond closely to up, destroy and ssh.
Ensure you have a working Python 2.7 installation:
pip install --user ibt
You can also clone from this repository and perform a dev install:
git clone https://github.com/rcook/ibt.git
pip install --user -e .
Note that Pip installs scripts to $HOME/.local/bin by default (varies based on platform), so make sure that this path is available on the system search path (via the PATH environment variable). You can do this by appending this in your .bashrc or other shell configuration script:
echo 'export PATH=$HOME/.local/bin:$PATH' >> ~/.bashrc
destroy: destroys the project’s Docker image
help: display help
info: shows system and project information
run: runs a command inside a Docker container
script: runs a script inside a Docker container
shell: runs an interactive shell inside a Docker container
up: creates Docker image for the project after optionally building base Docker image
All commands have available to them the following environment variables:
IBTALIASARGS: additional arguments passed on the command line to aliases
IBTPROJECTDIR: the current project directory in the container
IBTUSER and USER: the user name
Configuration for any given project is driven by the contents of the Ibtfile settings file which should be placed in the root directory of the project. Alternatively, an .ibtprojects file placed in the user’s home directory can be used to specify the location of the Ibtfile for zero or more project root directories for situations where the IBT configuration must be kept out of the source tree.
aliases: (optional) one or more project-specific command aliases
docker: specifies base Docker image information for project including
env_vars: (optional) one or more environment variables to define inside container image and build
ports: (optional) one or more host port-container port pairs to
container-project-dir: (optional) specifies directory to which project directory is mapped in container configure port forwarding
volumes: (optional) one or more additional volumes to mount inside container
Environment variable settings
The environment section contain multiple environment variables to be set in the container. The key represents the environment variable to be created. The value contains either the value or a reference to a substitution. A Substitution value starts with a $ and is resolved against the environment variable map. If the variable is not found, the environment variable is looked up on the host.
The volume section contains multiple keys and values. The key refers to a path on the host and the value contains the path in the container.
Key and values support variable expansion like the environment variables.
Create Docker images
All build commands will run inside a fully isolated Debian-based Docker container as specified by the project configuration in Ibtfile. First, create the base Docker images:
This creates debian-gcc which contains basic build tools, CMake and gdb and debian-gcc-python which extends this with the addition of Python 2.7. debian-gcc6 includes the GCC 6 toolchain. The last command will list locally available Docker images which will now include ibt/debian-gcc and ibt/debian-gcc-python etc.
Once this is done, the following commands (configured as aliases in Ibtfile) can be run to configure/make/run the project code:
ibt cmake: generates CMake build directory
ibt make: runs make inside CMake build directory
ibt exec: runs target binary
ibt debug: starts gdb and loads target binary
See contents of example subdirectory.
$ cd example/
$ ibt up
Building Docker image ibt-789dbc504a0690d786ddd43474dfbcc5
$ ibt cmake
-- The C compiler identification is GNU 6.3.0
-- The CXX compiler identification is GNU 6.3.0
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/g++
-- Check for working CXX compiler: /usr/bin/g++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Configuring done
-- Generating done
-- Build files have been written to: /example/build
$ ibt make
Scanning dependencies of target hello-world
[ 50%] Building CXX object CMakeFiles/hello-world.dir/hello-world.cpp.o
[100%] Linking CXX executable hello-world
[100%] Built target hello-world
$ ibt exec first second third
argv = ./hello-world
argv = first
argv = second
argv = third
$ ibt info
IBT: Isolated Build Tool
Working directory: /home/user/src/ibt/example
User: user (1002)
Group: group (1003)
Project directory: /home/user/src/ibt/example
Project ID: 789dbc504a0690d786ddd43474dfbcc5
Configuration file: /home/user/src/ibt/example/Ibtfile
Temporary directory: /home/user/src/ibt/example/.ibt
Project user information:
User: user (1002)
Group: group (1003)
Docker container information:
Docker image ID: ibt-789dbc504a0690d786ddd43474dfbcc5
Project directory: /example
Temporary directory: /example/.ibt
Docker base image: ibt/debian-gcc6
Temporary directory: exists
Docker image: built
cmake = run 'cd $IBTPROJECTDIR && mkdir -p build && cd build && cmake -DCMAKE_BUILD_TYPE=Debug ..'
debug = shell /bin/sh -c 'cd $IBTPROJECTDIR/build && gdb ./hello-world'
exec = run 'cd $IBTPROJECTDIR/build && ./hello-world'
- cd $IBTPROJECTDIR/build
$ ibt destroy
Destroying Docker image ibt-789dbc504a0690d786ddd43474dfbcc5
Released under MIT License
Copyright © 2016, Richard Cook. All rights reserved.
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