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Add an example for using decman

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Kivi Kaitaniemi
2025-12-18 05:45:07 +02:00
parent 20171333ae
commit 1e3b83b3d8
15 changed files with 249 additions and 459 deletions
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README.md
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@@ -14,6 +14,8 @@ Decman is a declarative package & configuration manager for Arch Linux. It allow
## Overview ## Overview
[See the example for a quick tutorial.](/example/README.md)
To use decman, you need a source file that declares your system installation. I recommend you put this file in source control, for example in a git repository. To use decman, you need a source file that declares your system installation. I recommend you put this file in source control, for example in a git repository.
`/home/user/config/source.py`: `/home/user/config/source.py`:
docs/README.md
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@@ -375,10 +375,10 @@ For conveniance, decman provides some plugins with quick access.
```py ```py
import decman import decman
decman.pacman = decman.plugins.get("pacman") assert decman.pacman == decman.plugins.get("pacman")
decman.aur = decman.plugins.get("aur") assert decman.aur == decman.plugins.get("aur")
decman.systemd = decman.plugins.get("systemd") assert decman.systemd == decman.plugins.get("systemd")
decman.flatpak = decman.plugins.get("flatpak") assert decman.flatpak == decman.plugins.get("flatpak")
``` ```
### Creating custom plugins ### Creating custom plugins
@@ -457,6 +457,7 @@ In `pyproject.toml` set:
systemd = "decman.plugins.systemd:Systemd" systemd = "decman.plugins.systemd:Systemd"
pacman = "decman.plugins.pacman:Pacman" pacman = "decman.plugins.pacman:Pacman"
aur = "decman.plugins.aur:AUR" aur = "decman.plugins.aur:AUR"
flatpak = "decman.plugins.flatpak:Flatpak"
``` ```
## Useful utilities ## Useful utilities
docs/aur.md
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@@ -43,6 +43,18 @@ decman.aur.custom_packages |= {
This plugin's execution order step name is `aur`. This plugin's execution order step name is `aur`.
### Command line
This plugin accepts params via the command line.
```sh
sudo decman --params aur-upgrade-devel aur-force
```
`aur-upgrade-devel` causes devel packages (packages from version control, such as `*-git` packages) to be upgraded.
`aur-force` causes decman to rebuild packages that were already cached.
### Within modules ### Within modules
Modules can also define AUR packages and custom packages. Decorate a module's method with `@decman.plugins.aur.packages` or `@decman.plugins.aur.custom_packages`. For AUR packages return a `set[str]` of package names from that module. Custom packages should return a `set[CustomPackage]`. Modules can also define AUR packages and custom packages. Decorate a module's method with `@decman.plugins.aur.packages` or `@decman.plugins.aur.custom_packages`. For AUR packages return a `set[str]` of package names from that module. Custom packages should return a `set[CustomPackage]`.
example/README.md
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@@ -0,0 +1,212 @@
# Example
This directory contains an example of a minimal decman configuration. This also functions as a tutorial for starting out with decman. I recommend looking at the [docs](/docs/README.md) after this.
## Tutorial
### Installing decman
I will first install git and base-devel. Then I'll clone the PKGBUILD and install decman.
```sh
sudo pacman -S git base-devel
git clone https://aur.archlinux.org/decman.git
cd decman/
makepkg -sic
```
### Starting out
I will create a source directory for the system's configuration.
```sh
mkdir ~/source
cd ~/source
```
Decman will remove all explicitly installed packages not found in the source. Let's find all explicitly installed packages.
```sh
$ pacman -Qeq
base
base-devel
btrfs-progs
decman
dosfstools
efibootmgr
git
grub
linux
openssh
qemu-guest-agent
sudo
vim
```
First thing to note: `decman` is not a native package. I remember this, but if you don't, you can find only native packages with `pacman -Qeqn` and foreign packages with `pacman -Qeqm`. Since decman is not a native package, the pacman plugin cannot handle it. I'll add decman to AUR packages.
Instead of adding all of these packages to `decman.pacman.packages`, I will first create a module for base system packages in `~/source/base.py`.
```py
import decman
from decman.plugins import pacman, aur
class BaseModule(decman.Module):
def __init__(self):
# I'll intend this module to be a singleton (only one instance ever),
# so I'll inline the module name
super().__init__("base")
@pacman.packages
def pkgs(self) -> set[str]:
return {
"base",
"btrfs-progs",
"dosfstools",
"efibootmgr",
"grub",
"linux",
# I'll also include git and base-devel here, they are essential to this system
"git",
"base-devel",
}
@aur.packages
def aurpkgs(self) -> set[str]:
return {"decman"}
```
Then I'll create the main source file with the rest of the packages. I'll import `BaseModule` and add it to `decman.modules`. The main file is `~/source/source.py`.
```py
import decman
from base import BaseModule
decman.pacman.packages |= {"openssh", "qemu-guest-agent", "sudo", "vim"}
decman.modules |= {BaseModule()}
```
This config is already enough to run decman for the first time.
```sh
sudo decman --source /home/arch/source/source.py
```
This will run a system upgrade, but otherwise nothing else happens, since my system already matches the desired configuration.
### Extending my config with files and commands
Now I'll want to gradually add more stuff to my config. As an example, I'll add my custom `mkinitcpio.conf`. I'll create the file `~/source/files/mkinitcpio.conf` with the desired content. Then I'll add the file to my `BaseModule`. Since I want to run the command `mkinitcpio -P` every time I update my config, I'll add a on change hook as well. I'll update the file `~/source/base.py`.
```py
class BaseModule(decman.Module):
...
def files(self) -> dict[str, decman.File]:
return {"/etc/mkinitcpio.conf": decman.File(source_file="./files/mkinitcpio.conf")}
def on_change(self, store):
decman.prg(["mkinitcpio", "-P"])
```
I'll also add my vim config to decman. I could now create a Vim module, but since my config is simple, I feel that is not needed. I'll update the main source file `~/source/source.py`.
```py
import decman
...
decman.files["/home/arch/.vimrc"] = decman.File(source_file="./files/vimrc", owner="arch", permissions=0o600)
```
Then I'll apply my changes. Decman will remember my source, so no need to give it as an argument anymore. I don't want to waste time checking for aur updates, so I'll skip them.
```sh
sudo decman --skip aur
```
### Systemd services and flatpaks
I want add a desktop environment. I'll create a module for that in the file `~/source/kde.py`. I'll use SDDM as the login manager. SDDM service needs to be enabled, so I'll use the systemd plugin for that.
```py
import decman
from decman.plugins import pacman, systemd
class KDE(decman.Module):
def __init__(self):
super().__init__("kde")
@pacman.packages
def pkgs(self) -> set[str]:
return {
"plasma-desktop",
"konsole",
"sddm",
}
@systemd.units
def units(self) -> set[str]:
return {"sddm.service"}
```
I'll add the module to enabled modules in `~/source/source.py`.
```py
import decman
from base import BaseModule
from kde import KDE
...
decman.modules |= {BaseModule(), KDE()}
```
I'll run decman once again. I'll also start SDDM manually, since decman can't autostart it.
```sh
sudo decman
sudo systemctl start sddm
```
Lastly I want to install some packages with flatpak. I'll first have to install flatpak to make the plugin available. I'll do it manually since it's quicker.
```sh
sudo pacman -S flatpak
```
Then I'll modify `~/source/source.py`. I must add `flatpak` to execution steps to run the plugin.
```py
import decman
...
decman.execution_order = [
"files",
"pacman",
"aur",
"flatpak",
"systemd",
]
decman.pacman.packages.add("flatpak")
decman.flatpak.packages |= {"org.mozilla.firefox", "org.signal.Signal"}
```
Then run decman.
```sh
sudo decman
```
### Maintaining a system with decman
Decman is intended to replace your upgrade procedures. Instead of running `yay -Syu` for example, you would run `sudo decman`. With `after_update` hooks you can chain other update commands such as `rustup update`. This way you'll only have to remember to run decman. All other update steps are defined in your source.
## Plugins
It is possible to create your own plugins for decman. However, you probably won't need to do that, as modules are already very capable. This example directory also contains a **very** minimal plugin. To learn more about plugins, look at [the docs](/docs/README.md).
example/files/app-config/config.cfg
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# Imagine something here
example/files/app-config/f.txt
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@@ -1,3 +0,0 @@
Why are you looking here?
What is '%msg%'?
example/files/app-config/sub-dir/i-will-be-copied-too.txt
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Thats right!
example/files/mkinitcpio.conf
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@@ -0,0 +1,4 @@
MODULES=()
BINARIES=()
FILES=()
HOOKS=(base systemd autodetect microcode modconf kms keyboard keymap sd-vconsole block filesystems fsck)
example/files/user-script.sh
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@@ -1,2 +0,0 @@
#!/usr/bin/env bash
echo "Hello, World!"
example/files/vimrc
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@@ -0,0 +1,2 @@
set number
syntax on
example/my_module.py
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@@ -1,124 +0,0 @@
# from import is ok for importing classes and functions
# just remember to not import variables this way
from decman import Directory, File, Module, UserPackage, prg, sh
class MyModule(Module):
def __init__(self):
self.pkgs = ["rust"]
self.update_rustup = False
# Modules have names and versions.
# Names must be unique.
# If you disable a module, all packages, files etc assocated with module are removed.
super().__init__(name="Example module", enabled=True, version="1")
# You can add any methods etc to your modules.
def enable_my_custom_feature(self, b: bool):
if b:
self.pkgs = ["rustup"]
self.update_rustup = True
# This is ran, when the module gets enabled
def on_enable(self):
# Run arbitary shell code easily with the included sh function.
sh("groupadd mygroup")
# or run a program with arguments.
prg(["usermod", "--append", "--groups", "mygroup", "kk"])
# NOTE! Removing a enabled module from decman.module means that on_disable will not run.
# Instead disable the module.
def on_disable(self):
# You can run commands as any user
sh("whoami", user="kk")
# And override environment variables
sh("echo $HI", env_overrides={"HI": "Hello!"})
# Same options apply to prg as well.
def after_update(self):
# Run code after running decman.
if self.update_rustup:
prg(["rustup", "update"], user="kk")
def after_version_change(self):
# Modules have version numbers to allow conditionally running code.
# You could for example run mkinitcpio only after your config has changed.
# Just remember to change the version number.
prg(["mkinitcpio", "-P"])
# Files defined here are the same as outside of modules.
# There is however an additional feature:
# You may add variables to text files, that will be replaced with the given value.
def file_variables(self) -> dict[str, str]:
return {"%msg%": "Hello, world!"}
def files(self) -> dict[str, File]:
# Variables are substituted in text files automatically.
return {
"/usr/local/bin/say-hello": File(
content="#!/usr/bin/env bash\necho %msg%", permissions=0o755
),
# Variables are not substituted in binary files.
"/usr/local/share/say-hello/image.png": File(
source_file="files/i-dont-exist.png", bin_file=True
),
}
def directories(self) -> dict[str, Directory]:
# Directories are handeled the same way. Variables are substituted in text files.
return {
"/home/kk/.config/mod-app/": Directory(source_directory="files/app-config", owner="kk")
}
# Packages and systemd units are basically the same with modules as without modules.
def pacman_packages(self) -> list[str]:
# Return pacman packages depending on the usage of this module.
return self.pkgs
def user_packages(self) -> list[UserPackage]:
# Note, decman now has a aur package, I recommend using that instead.
# Also, this example may be out of date
return [
UserPackage(
pkgname="decman-git",
version="0.4.1",
provides=["decman"],
dependencies=[
"python",
"python-requests",
"devtools",
"systemd",
"pacman",
"git",
"less",
],
make_dependencies=[
"python-setuptools",
"python-build",
"python-installer",
"python-wheel",
],
git_url="https://github.com/kiviktnm/decman-pkgbuild.git",
)
]
def aur_packages(self) -> list[str]:
return ["protonvpn"]
def flatpak_packages(self) -> list[str]:
return ["org.mozilla.firefox"]
def flatpak_user_packages(self) -> dict[str, list[str]]:
return {"username": ["io.github.kolunmi.Bazaar"]}
def systemd_units(self) -> list[str]:
return ["reflector.timer"]
def systemd_user_units(self) -> dict[str, list[str]]:
return {"kk": ["syncthing.service"]}
example/plugin/decman_plugin_example.py
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@@ -8,3 +8,13 @@ class Example(decman.Plugin):
def available(self) -> bool: def available(self) -> bool:
return os.path.exists("/tmp/example_plugin_available") return os.path.exists("/tmp/example_plugin_available")
def process_modules(self, store: decman.Store, modules: set[decman.Module]):
# Toy example for setting modules as changed
for module in modules:
module._changed = True
def apply(
self, store: decman.Store, dry_run: bool = False, params: list[str] | None = None
) -> bool:
return True
example/source.py
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# This example covers all decman features and many useful ways of configuring a system.
# Configuration can be as simple or as complex as is needed.
import os
import socket
# Note: Do NOT use from imports for global variables
# BAD: from decman import packages/modules/etc
import decman
import decman.config
# This is fine since the thing being imported is a class and not a global variable.
from decman import Directory, File, UserPackage, UserRaisedError
# Flatpaks are disabled by default. This way no already installed flatpaks will get suddenly deleted.
decman.config.enable_flatpak = True
# Configuring what packages are installed is easy.
# Duplicates are OK, so if you have multiple modules that want to ensure a package is installed,
# you can add the same package multiple times.
decman.packages += ["python", "python", "devtools", "git", "networkmanager"]
# Decman matches installed packages to those defined in the configuration.
# This means that:
# - all packages not installed on the system but defined in the source are installed
# - all packages installed on the system but not defined in the source are removed
# To make decman not care if a package is installed or not, add it to ignored_packages.
# Ignored packages can be normal packages or aur packages.
decman.ignored_packages += ["rustup", "yay"]
# Installing AUR packages is easy.
decman.aur_packages += ["decman", "protonvpn"]
# Flatpaks work the same way as all other packages.
decman.flatpak_packages += ["dev.qwery.AddWater"]
# They too can be ignored of course
decman.ignored_flatpak_packages += ["org.signal.Signal"]
# You can also install them to your user installation instead of the system installation
# Ensure that previous user installed flatpak declarations aren't overwritten and they are initialized.
decman.flatpak_user_packages["kk"] = decman.flatpak_user_packages.get("kk", [])
# Now add the package.
decman.flatpak_user_packages["kk"].append("dev.zed.Zed")
# To import GPG keys, set the GNUPGHOME environment variable.
# It can easily be done with python as well.
os.environ["GNUPGHOME"] = "/home/kk/.gnupg/"
# You then must set the user that builds the packages to the owner of the GPG home.
decman.config.makepkg_user = "kk"
# You can also install packages from anywhere, but then you must include some
# information about the package. The git_url is the url to the PKGBUILD,
#
# Note, decman now has a aur package, I recommend using that instead.
# Also, this example may be out of date
decman.user_packages.append(
UserPackage(
pkgname="decman-git",
version="0.4.1",
provides=["decman"],
dependencies=[
"python",
"python-requests",
"devtools",
"pacman",
"systemd",
"git",
"less",
],
make_dependencies=[
"python-setuptools",
"python-build",
"python-installer",
"python-wheel",
],
git_url="https://github.com/kiviktnm/decman-pkgbuild.git",
)
)
# Managing only packages with decman is not that interesting.
# Decman also has really powerful ways of managing config files, scripts etc.
# IMPORTANT: Decman will remove files that were created by decman, but are no longer in the decman source.
# Keep your files in version control to avoid losing important files accidentally.
# Define file content inline.
# Default text file encoding is utf-8 but it can be changed.
decman.files["/etc/vconsole.conf"] = File(content="KEYMAP=us", encoding="utf-8")
# Include file content from another file, set the file owner and permissions.
# The source_file is relative to the directory where the main decman source.py is located.
# By default, the file group is set to the group of the owner, but it can be overridden with the group argument.
decman.files["/home/kk/.bin/user-script.sh"] = File(
source_file="files/user-script.sh", owner="kk", permissions=0o744
)
# Non-text files such as images can also be managed.
decman.files["/home/kk/.background.png"] = File(
source_file="files/i-dont-actually-exist.png", bin_file=True, owner="kk"
)
# If you need to install multiple files at once, use directories.
# All files from the source directory will be copied recursively to the target.
decman.directories["/home/kk/.config/app/"] = Directory(
source_directory="files/app-config", owner="kk"
)
# Decman has built in support for managing systemd units as well.
# Decman will enable services declared here, and disable services removed from here.
# If you don't want decman to manage a service, don't add it here. It will ignore all units that
# weren't enabled here.
decman.enabled_systemd_units += ["NetworkManager.service"]
# You can manage units for users as well.
# Ensure that previous user unit declarations aren't overwritten and they are initialized.
decman.enabled_systemd_user_units["kk"] = decman.enabled_systemd_user_units.get("kk", [])
# Add user unit.
decman.enabled_systemd_user_units["kk"].append("syncthing.service")
# Most powerful feature of decman are modules.
# In this file you see how to include your module, but to really see what modules are capable of
# look at the MyModule class.
from my_module import MyModule
my_own_mod = MyModule()
# You have full access to python, which makes your configuration very dynamic.
# For example: do something if the computers hostname is arch-1
if socket.gethostname() == "arch-1":
# Modules make dynamic configuration easy.
# This executes code defined in MyModule which can affect for example what packages are
# installed as a part of this module.
my_own_mod.enable_my_custom_feature(True)
else:
# If you want to abort running decman from your config because something is wrong, raise a UserRaisedError
raise UserRaisedError("Unknown hostname!")
decman.modules += [my_own_mod]
# Configuring the behavior of decman is also done here.
# These are the default values.
# Note: you probably don't want to change these 2 settings and instead you'll want to to use the --debug CLI option.
# Show debug output
decman.config.debug_output = False
# Suppress output of some commands that you probably don't want to see.
decman.config.suppress_command_output = True
# Make output less verbose. Summaries are still printed.
decman.config.quiet_output = False
# Decman captures pacman command output, and any line (and adjacent lines) that contains any of
# the following keywords (case-insensetive) will be printed after the pacman command finishes.
#
# REMEMBER: You should still generally pay attention to pacman output
# since these keywords may not catch all cases.
decman.config.pacman_output_keywords = [
"pacsave",
"pacnew",
# Additional keywords can be:
# "warning",
# "error",
# "note",
# They might cause too many highlights however.
]
# If you don't want to print lines that contain keywords, set this to False
decman.config.print_pacman_output_highlights = True
# The user which builds aur and user packages.
# decman.config.makepkg_user = "nobody" # This was set in a previous example. Let's not override it.
# The build directory decman uses for creating a chroot etc.
decman.config.build_dir = "/tmp/decman/build"
# Built packages are stored here.
decman.config.pkg_cache_dir = "/var/cache/decman"
# Timeout in seconds for fetching aur package details.
decman.config.aur_rpc_timeout = 30
# Enable installing and upgrading foreign packages.
decman.config.enable_fpm = True
# Number of package files per package kept in the cache
# All built AUR packages and user packages are stored in cache.
decman.config.number_of_packages_stored_in_cache = 3
# Changing the default commands decman uses for things is a bit more complex.
# Create a child class of the decman.config.Commands class and override methods.
# These are the defaults.
class MyCommands(decman.config.Commands):
def list_pkgs(self) -> list[str]:
return ["pacman", "-Qeq", "--color=never"]
def list_foreign_pkgs_versioned(self) -> list[str]:
return ["pacman", "-Qm", "--color=never"]
# --color=always is used in many commands since --color=auto results in no color.
# It seems a sensible default for me, since decman already uses color and it can't be disabled.
def install_pkgs(self, pkgs: list[str]) -> list[str]:
return ["pacman", "-S", "--color=always", "--needed"] + pkgs
def install_files(self, pkg_files: list[str]) -> list[str]:
return ["pacman", "-U", "--color=always", "--asdeps"] + pkg_files
def set_as_explicitly_installed(self, pkgs: list[str]) -> list[str]:
return ["pacman", "-D", "--asexplicit"] + pkgs
def install_deps(self, deps: list[str]) -> list[str]:
return ["pacman", "-S", "--color=always", "--needed", "--asdeps"] + deps
def is_installable(self, pkg: str) -> list[str]:
return ["pacman", "-Sddp", pkg]
def upgrade(self) -> list[str]:
return ["pacman", "-Syu", "--color=always"]
def remove(self, pkgs: list[str]) -> list[str]:
return ["pacman", "-Rs", "--color=always"] + pkgs
def enable_units(self, units: list[str]) -> list[str]:
return ["systemctl", "enable"] + units
def disable_units(self, units: list[str]) -> list[str]:
return ["systemctl", "disable"] + units
def enable_user_units(self, units: list[str], user: str) -> list[str]:
return ["systemctl", "--user", "-M", f"{user}@", "enable"] + units
def disable_user_units(self, units: list[str], user: str) -> list[str]:
return ["systemctl", "--user", "-M", f"{user}@", "disable"] + units
def compare_versions(self, installed_version: str, new_version: str) -> list[str]:
return ["vercmp", installed_version, new_version]
def git_clone(self, repo: str, dest: str) -> list[str]:
return ["git", "clone", repo, dest]
def git_diff(self, from_commit: str) -> list[str]:
return ["git", "diff", from_commit]
def git_get_commit_id(self) -> list[str]:
return ["git", "rev-parse", "HEAD"]
def git_log_commit_ids(self) -> list[str]:
return ["git", "log", "--format=format:%H"]
def review_file(self, file: str) -> list[str]:
return ["less", file]
def make_chroot(self, chroot_dir: str, with_pkgs: list[str]) -> list[str]:
return ["mkarchroot", chroot_dir] + with_pkgs
def install_chroot_packages(self, chroot_dir: str, packages: list[str]):
return [
"arch-nspawn",
chroot_dir,
"pacman",
"-S",
"--needed",
"--noconfirm",
] + packages
def resolve_real_name(self, chroot_dir: str, pkg: str) -> list[str]:
return [
"arch-nspawn",
chroot_dir,
"pacman",
"-Sddp",
"--print-format=%n",
pkg,
]
def remove_chroot_packages(self, chroot_dir: str, packages: list[str]):
return ["arch-nspawn", chroot_dir, "pacman", "-Rsu", "--noconfirm"] + packages
def make_chroot_pkg(
self, chroot_wd_dir: str, user: str, pkgfiles_to_install: list[str]
) -> list[str]:
makechrootpkg_cmd = ["makechrootpkg", "-c", "-r", chroot_wd_dir, "-U", user]
for pkgfile in pkgfiles_to_install:
makechrootpkg_cmd += ["-I", pkgfile]
return makechrootpkg_cmd
# To apply your overrides, set the commands variable.
decman.config.commands = MyCommands()
# Alternative to the built in AUR support:
# If you don't want to use the built in AUR helper, you can use some pacman wrapper that can run as root, such as pikaur.
# To do this, override commands and disable fpm.
class PikaurWrapperCommands(decman.config.Commands):
def list_pkgs(self) -> list[str]:
return ["pikaur", "-Qeq"]
def install_pkgs(self, pkgs: list[str]) -> list[str]:
return ["pikaur", "-S"] + pkgs
def upgrade(self) -> list[str]:
return ["pikaur", "-Syu"]
def remove(self, pkgs: list[str]) -> list[str]:
return ["pikaur", "-Rs"] + pkgs
# it doesn't matter if all pacman commands aren't overridden since they wont be used when fpm is disabled.
# decman.config.enable_fpm = False
# decman.config.commands = PikaurWrapperCommands()
# Then simply add all AUR packages to decman.packages
# decman.packages += ["pikaur"]
src/decman/app.py
+2 -2
View File
@@ -23,7 +23,7 @@ def main():
parser = argparse.ArgumentParser( parser = argparse.ArgumentParser(
prog="decman", prog="decman",
description="Declarative package & configuration manager for Arch Linux", description="Declarative package & configuration manager for Arch Linux",
epilog="See more help at: https://github.com/kiviktnm/decman", epilog="See the documentation: https://github.com/kiviktnm/decman",
) )
parser.add_argument("--source", action="store", help="python file containing configuration") parser.add_argument("--source", action="store", help="python file containing configuration")
@@ -54,7 +54,7 @@ def main():
help="don't print messages with color", help="don't print messages with color",
) )
parser.add_argument( parser.add_argument(
"--params", nargs="*", type=str, help="additional parameters passed to plugins" "--params", nargs="*", default=[], type=str, help="additional parameters passed to plugins"
) )
args = parser.parse_args() args = parser.parse_args()
src/decman/plugins/flatpak.py
-2
View File
@@ -218,8 +218,6 @@ class FlatpakInterface:
cmd, command.run(cmd, user=user, mimic_login=as_user) cmd, command.run(cmd, user=user, mimic_login=as_user)
) )
packages = packages_text.strip().split("\n") packages = packages_text.strip().split("\n")
# Remove header "Application ID"
packages.pop(0)
return set(packages) return set(packages)