Efficiently manage your dot-file configuration settings.
Homemaker is a lightweight tool for straightforward and efficient management of *nix configuration files found in the user's home directory, commonly known as dot-files. It can also be readily used for general purpose system bootstrapping, including installing packages, cloning repositories, etc. This tool is written in Go, requires no installation, has no dependencies and makes use of simple configuration file structure inspired by make to generate symlinks and execute system commands to aid in configuring a new system for use.
Ever since switching to using Linux as my daily driver operating system, I have been searching for a way to effectively manage settings between different computers (and system reinstalls on the same machine) while avoiding the accumulation of cruft that plagues our home directories.
Specifically, I required a solution that had the following characteristics:
Do not require software installation
The user may not have root privileges on all the computers that she accesses, making it difficult to make use software that has additional dependencies. Even if the user has root on the machine in question, it is sub-optimal to require her to install software packages just to bootstrap the system.
Support configuration variants
The user should be able to use cherry-pick which settings they wish to use. Different system installs have different configuration requirements; it must be possible to share common settings while keeping the unique bits unique to each machine. Furthermore, it should be possible to store all configuration settings in one location.
Make no assumptions about synchronization
While Git often works well for managing dot-files, it is not ideal for every situation. I've seen some applications add and remove seemingly randomly-named files within their configuration directories, while others store their settings in large, opaque binary blobs. Managing configuration settings for such poorly-behaved applications may be easier through, Dropbox, rsync, or some other utility outside of version control.
Be easy to read and modify the source
As a programmer, I always consider the underlying technology of a tool when deciding whether or not to use it. The user should feel empowered to change and test the application without having to deal with the archaic incantations otherwise known as shell scripts. Scripting languages can work well but are closely tied to the environment in which they are executed.
It soon became apparent to me that utility which met all of my requirements for simply did not exist. After making do with a hastily hacked-together Python script for a couple of months, I decided that this problem deserved a clean, formal solution. I settled on building this new utility in Go because in addition to the language syntax being clear and easy to understand, executables built by the Go compiler are statically linked, making them highly portable. Just drop the binary on your system and you are ready! The result of my work is Homemaker; I hope that you find it suitable for your needs.
If you already have the Go environment and toolchain set up, you can get the latest version by running:
$ go get github.com/FooSoft/homemaker
Otherwise, you can use the pre-built binaries for the platforms below:
Configuration files for Homemaker can be authored in your choice of TOML, JSON, or YAML markup languages. Being the easiest to read out of the three, TOML will be used for the example configuration files. Worry not if you are unfamiliar with this format; everything you need to know about it will be shown below.
Let's start by looking at a basic example configuration file,
example.toml. Notice that Homemaker determines which markdown language processor to use based on the extension of your c:nfiguration file. Use
.toml/.tmlfor TOML,
.yaml/.ymlfor YAML, and
.jsonfor JSON. Be aware that specifying an incorrect file extension will prevent your configuration file from being parsed correctly.
[tasks.default] links = [ [".config/fish"], [".config/keepassx"], [".config/terminal"], [".config/vlc"], [".gitconfig"], [".xinputrc"], ]
We could have just as easily written this configuration in JSON (or YAML for that matter), but it's subjectively uglier:
{ "tasks": { "default": { "links": [ [".config/fish"], [".config/keepassx"], [".config/terminal"], [".config/vlc"], [".gitconfig"], [".xinputrc"] ] } } }
To create symlinks based on the contents of the TOML file from before, we invoke the
homemakerutility as follows:
$ homemaker example.toml /mnt/data/config
To get a better idea of what
/mnt/data/configis, let's look at the in-program documentation:
Usage: homemaker [options] conf src https://foosoft.net/projects/homemaker/Parameters: -clobber delete files and directories at target -dest string target directory for tasks (default "/home/alex") -force create parent directories to target (default true) -nocmds don't execute commands -nolinks don't create links -task string name of task to execute (default "default") -unlink remove existing links instead of creating them -variant string execution variant for tasks and macros -verbose verbose output
For the purpose of our illustration,
srcis defined on the command line to be
/mnt/data/config; namely the source directory where your dot-files live (this will be your Git repository, Dropbox folder, rsync root, etc.). The symlinks that Homemaker creates will point to the configuration files in this directory. You may have noticed that you can also provide a destination directory via the
-destcommand line argument; this is where the symlinks should be created and it defaults to your home directory.
Another useful parameter is
task; it will be initialized to the value
defaultunless you override it on the command line. In practice, this means that Homemaker will try to find a task called
defaultand execute it. You can create as many unique tasks as necessary to correspond to your configuration requirements, and then choose which one will execute by specifying it on the command line in the format
-task=taskname. Good candidates for tasks are computer names, as shown in the configuration file below:
[tasks.flatline] links = [ [".config/syncthing", ".config/syncthing_flatline"], [".s3cfg"], [".sabnzbd"], [".ssh", ".ssh_flatline"], ][tasks.wintermute] links = [ [".config/syncthing", ".config/syncthing_wintermute"], [".ssh", ".ssh_wintermute"], ]
Here we see two tasks, named after the computers that will be using them,
flatlineand
wintermute. Certain configuration data like key pairs and other per-machine settings should only be linked on the computer that is using them. That is to say if
flatlineand
wintermuteboth try to manage the
.sshdirectory, a conflict will occur at both the source and destination directories. We can easily resolve the source directory conflict by giving the
.sshdirectories unique names, such as
.ssh_flatlineand
.ssh_wintermute. The conflict at the destination directory can be fixed as shown above; we will create per-machine tasks that will symlink only the needed directory.
You may have noticed that each entry in the
linkscollection is an array, which up until now has contained only one item. A second item can be added if the source file or directory name is different from that in the destination. If the paths provided are relative they will be assumed to be relative to the destination and source directories respectively.
Now that we have machine specific tasks defined in our configuration file, it would be nice to still be able to share configuration settings that are common to the two computers. We can do this by adding a
deparray to our tasks as shown below:
[tasks.common] links = [ [".config/fish"], [".config/keepassx"], [".config/terminal"], [".config/vlc"], [".gitconfig"], [".xinputrc"], ][tasks.flatline] deps = ["common"] links = [ [".config/syncthing", ".config/syncthing_flatline"], [".s3cfg"], [".sabnzbd"], [".ssh", ".ssh_flatline"], ]
[tasks.wintermute] deps = ["common"] links = [ [".config/syncthing", ".config/syncthing_wintermute"], [".ssh", ".ssh_wintermute"], ]
Homemaker will process the dependency tasks before processing the task itself.
Sometimes, just linking a config file is not enough, because the content of the configuration file needs to be adapted to the target and we do not want to maintain several different versions of the same file. For such use cases, Homemaker supports templates. The configuration syntax for templates is the same as for links.
[tasks.template] templates = [ [".gitconfig"] ]
In the template file, the go templating syntax is used for the customization of the configuration file. With the
.Envprefix, all environment variables are available. Template example:
[user] name = "John Doe" {{if eq .Env.USER "john"}} email = "[email protected]" {{else}} email = "[email protected]" {{end}}
In addition to creating links and processing templates, Homemaker is capable of executing commands on a per-task basis. Commands should be defined in an array called
cmds, split into an item per each command line argument. All of the commands are executed with
destas the working directory (as mentioned previously, this defaults to your home directory). If any command returns a nonzero exit code, Homemaker will display an error message and prompt the user to determine if it should abort, retry, or cancel. Additionally, if you must have explicit control of whether commands execute before or after the linking phase, you can use the
cmdspreand
cmdspostarrays which have similar behavior.
The example task below will clone and install configuration files for Vim into the
~/.configdirectory, and create links to it from the home directory. You may notice that this task references an environment variable (set by Homemaker itself) in the
linksblock; you can read more about how to use environment variables in the following section.
[tasks.vim] cmds = [ ["rm", "-rf", ".config/vim"], ["git", "clone", "https://github.com/FooSoft/dotvim", ".config/vim"], ] links = [ [".vimrc", "${HM_DEST}/.config/vim/.vimrc"], [".vim", "${HM_DEST}/.config/vim/.vim"], ]
Homemaker supports the expansion of environment variables for both command and link blocks as well as for dependencies. This is a good way of avoiding having to hard code absolute paths into your configuration file. To reference an environment variable simply use
${ENVVAR}or
$ENVVAR, where
ENVVARis the variable name (notice the similarity to normal shell variable expansion). In addition to being able to reference all of the environment variables defined on your system, Homemaker defines a couple of extra ones for ease of use:
HM_CONFIG
Path to the homemaker configuration file.
HM_TASK
Task name invoked from the command line.
HM_SRC
Source directory for link creation.
HM_DEST
Destination directory for link creation.
HM_VARIANT
Variant used for task and macro execution.
Environment variables can also be set within tasks block by assigning them to the
envsvariable. The example below demonstrates the setting and clearing of environment variables:
[tasks.default] envs = [ ["MYENV1", "foo"], # set MYENV1 to foo ["MYENV2", "foo", "bar"], # set MYENV2 to foo,bar ["MYENV3"], # clear MYENV3 ]
It should be pointed out that it is possible to reference other environment variables using the syntax shown in the first part of this section. This makes it possible to expand variables like
PATHwithout overwriting their existing value.
It is often convenient to execute certain commands repeatedly within task blocks to install packages, clone git repositories, etc. Homemaker provides macro blocks for this purpose; you can specify a command prefix and suffix that is used to wrap the parameters you provide. For example, you can declare a macro for
apt-get installand with the declaration shown below (much like tasks, macro declarations are global).
[macros.install] prefix = ["sudo", "apt-get", "install", "-y"]
Macros can be referenced from commands by prefixing the macro name with the
@symbol (it must be the first character of the first item of a command). For example, the task below installs several python packages using the macro above:
[tasks.python] cmds = [ ["@install", "python-dev", "python-pip", "python3-pip"] ]
Macros can have dependencies just like tasks. The
git clonemacro below makes sure that git is installed before attempting to clone a repository with it.
[macros.clone] deps = ["git"] prefix = ["git", "clone"][tasks.git] cmds = [ ["@install", "git"] ]
Macros help reduce the clutter that comes from the repeated commands which must be executed to bootstrap a new system. When executed with the
verboseoption, Homemaker will echo the expanded macro commands before executing them.
If you wish to use this tool in a truly cross-platform and cross-distribution manner without authoring multiple configuration files, you will have to provide information to Homemaker about the environment it is running in. Different operating systems and distributions use different package managers and package names; we solve this problem with task and macro variants.
For example, if you want to write a generic macro for installing packages that works on both Ubuntu and Arch Linux, you can define the following variants (Ubuntu uses the apt package manager and Arch Linux uses pacman).
[macros.install__ubuntu] prefix = ["sudo", "apt-get", "install"][macros.install__arch] prefix = ["sudo", "pacman", "-S"]
The double underscore characters signify that the following identifier is a variant decorator. In most cases, you only have to think about variants when you are writing task and macro definitions, not when using them. For example, to see how to use the
installmacro that we just created, examine the configuration below:
[tasks.tmux] cmds = [["@install", "tmux"]]
Notice that the package manager is conveniently abstracted by the
installmacro. Be aware that for this example to work properly, you must specify a variant on the command line as shown below. Failing to specify a variant will cause Homemaker try to look for an undecorated
installmacro (which doesn't exist), leading to failure.
$ homemaker --variant=ubuntu example.toml /mnt/data/config
Tasks can be be decorated much like commands:
[tasks.vim__server] cmds = [["@install", "vim-nox"]][tasks.vim] cmds = [["@install", "gvim"]]
In the above example, we avoid installing
gvimon the server variant, where the X windowing system is not installed or needed. Homemaker only executes the best task or macro candidate; if the provided variant does not match any tasks or macros, the base undecorated version will be used instead if it is available.
The command below will execute the
vim__servertask:
$ homemaker --variant=server example.toml /mnt/data/config
Both of the commands below will execute the
vimtask:
$ homemaker --variant=foobar example.toml /mnt/data/config $ homemaker example.toml /mnt/data/config
If for some reason you wish to explicitly reference the base task from the decorated task, you can add a dependency that contains a variant override as shown in the somewhat contrived examples below:
[tasks.foo] [tasks.foo__specific] deps = ["foo__"] # executes foo and foo_specific[tasks.bar__specific] [tasks.bar] deps = ["bar__specific"] # executes bar_specific and bar
Although variants are somewhat of an advanced topic as far as Homemaker features are concerned, they can be used to provide some basic conditional functionality to your configuration file without significantly increasing complexity for the user.
Homemaker provides a facility for determining whether or not a given task should execute at runtime; this is accomplished with the
acceptsand
rejectstask variables. Both follow the same syntax as the
cmdsvariable and support macro and environment variable expansion.
accepts
Execute commands non-interactively; any non-zero return code will cause the task to be skipped.
rejects
Execute commands non-interactively; any return code of zero code will cause the task to be skipped.
The intent of this feature is to allow tasks to "early out" when the work they carry out has already been completed. In the example below, we use the
whichcommand to see if fish shell is already installed before trying to install it. This is possible because
whichreturns a non-zero value when it encounters strings which do not correspond to applications installed on the current system.
[tasks.fish] rejects = [["which", "fish"]] cmds = [["@install", "fish"], ["chsh", "-s", "/usr/bin/fish"]] links = [[".config/fish/config.fish"]]
The
acceptsvariable is the logical opposite of
rejectsand can be used to conditionally execute tasks only when all of the specified commands exit out with a return code of zero.
Executing Homemaker with the
-helpcommand line argument will trigger online help to be displayed. The list below provides a more detailed description of what the parameters do.
clobber
By default, Homemaker will only remove identically-named symlinks at the destination directory. Using this parameter will cause Homemaker to be more aggressive and delete clashing files and entire directories as well. This can be useful for getting rid of the default configuration settings some applications write when you run them for the first time, but should obviously be used with caution.
dest
This parameter specifies destination where Homemaker is to create symlinks. This will default to the home directory for the current user, and as long as you are just using this application to manage dot-files, will probably never need to be changed.
force
Sometimes dot-files for an application are nested within parent directories that must exist in order to allow the symlink to be successfully created (for example the
.configdirectory in
.config/vlc). As this is the expected behavior, this parameter defaults to
true; however you can explicitly disable it if required. You can specify the access permissions of directories created by force by providing a third array item in the link descriptor. For example, if you wanted the
.sshdirectory to be created with mode
700, you could write the following:
[".ssh/id_rsa.pub", ".ssh_flatline/id_rsa.pub", "0700"]. Notice that you can specify permissions in octal notation by adding a leading zero value (the
0xprefix signifies hexadecimal).
nocmds
Do not execute commands for the
cmdsblocks inside of tasks.
nolinks
Do not create links for the
linksblocks inside of tasks.
task
This parameter is used to specify which task Homemaker will process when executed. It defaults to the
defaulttask, which should be used when creating a configuration file that does not have system-specific tasks specified.
unlink
Sometimes it's useful to "uninstall" links previously created by Homemaker. When running with the
unlinkflag, the tool will delete the links created by the tasks provided. This flag automatically sets the
nocmdsflag as well, because it makes no sense to execute commands when performing an uninstall operation.
variant
When using homemaker across different operating systems or distributions it can be useful to be able to perform conditional command and task execution, allowing for variation in things like package names and package management tools. This parameter is used for specifying the name of the variant that should be used.
verbose
When something isn't going the way you expect, you can use this parameter to make Homemaker to log everything it is doing to console.
Below is a sample configuration file which should help to illustrate how Homemaker can be used in practice.
# # macros #[macros.clone] deps = ["git"] prefix = ["git", "clone"]
[macros.install] prefix = ["sudo", "dnf", "install", "-y"]
development
[tasks.dev] deps = ["git", "vim", "node", "python", "golang"] cmds = [[ "@install", "make", "automake", "gcc", "gcc-c++", "cmake", "the_silver_searcher", "meld", "ncurses-compat-libs", ]]
[tasks.git] cmds = [["@install", "git"]] links = [[".gitconfig"]]
[tasks.golang] envs = [["GOPATH", "${HM_DEST}/projects/go"]] cmds = [["mkdir", "-p", "$GOPATH"], ["@install", "golang"]]
[tasks.node] cmds = [["@install", "nodejs", "npm"]]
[tasks.python] cmds = [["@install", "python-devel", "python-pip"]]
[tasks.vim] deps = ["vimrc"] cmds = [["@install", "vim-X11", "vim-enhanced"]]
[tasks.vimrc] rejects = [["test", "-d", ".config/vim"]] cmds = [["@clone", "https://github.com/FooSoft/dotvim.git", ".config/vim"]] links = [ [".vim", "$HM_DEST/.config/vim/.vim"], [".vimrc", "$HM_DEST/.config/vim/.vimrc"], [".eslintrc.json"], ]
general
[tasks.fusion] cmds = [["/home/alex/projects/dotfiles/bin/fusion.sh"]]
[tasks.virtualbox] cmds = [["@install", "VirtualBox"]]
[tasks.nvidia] deps = ["fusion"] cmds = [["@install", "akmod-nvidia"]]
[tasks.vlc] deps = ["fusion"] cmds = [["@install", "vlc"]]
[tasks.dropbox] deps = ["fusion"] cmds = [["@install", "dropbox"]]
[tasks.fish] rejects = [["which", "fish"]] cmds = [["@install", "fish"], ["chsh", "-s", "/usr/bin/fish"]] links = [[".config/fish/config.fish"]]
[tasks.common_term] cmds = [["@install", "openssh-server", "fzf", "htop", "p7zip", "unrar", "tmux", "whois", "rsync"]] links = [["bin"]]
[tasks.ibus] cmds = [["@install", "ibus", "ibus-anthy", "ibus-qt"]]
[tasks.default] deps = ["fusion", "common_term", "ibus", "vlc", "dropbox", "dev"] cmds = [["@install", "gimp", "keepassxc", "speedcrunch"]] links = [[".profile"]]