Conda lock is a lightweight library that can be used to generate fully reproducible lock files for conda environments.
It does this by performing a conda solve for each platform you desire a lockfile for.
This also has the added benefit of acting as an external pre-solve for conda as the lockfiles it generates results in the conda solver not being invoked when installing the packages from the generated lockfile.
Conda environment.yml files are very useful for defining desired environments but there are times when we want to
be able to EXACTLY reproduce an environment by just installing and downloading the packages needed.
This is particularly handy in the context of a gitops style setup where you use conda to provision environments in various places.
Use one of the following commands:
pipx install conda-lock
condax install conda-lock
pip install conda-lock
conda install --channel=conda-forge --name=base conda-lock
mamba install --channel=conda-forge --name=base conda-lockThe first two options are recommended since they install conda-lock into an isolated environment. (Otherwise there is a risk of dependency conflicts.)
If you would like to contribute to conda-lock, please refer to the Contributing Guide for instructions on how to set up your development environment.
# generate a multi-platform lockfile
conda-lock -f environment.yml -p osx-64 -p linux-64
# optionally, update the previous solution, using the latest version of
# pydantic that is compatible with the source specification
conda-lock --update pydantic
# create an environment from the lockfile
conda-lock install [-p {prefix}|-n {name}]
# alternatively, render a single-platform lockfile and use conda command directly
conda-lock render -p linux-64
conda create -n my-locked-env --file conda-linux-64.lockNote: If there is an existing lockfile, it is used as constraint when regenerating the lockfile. This can be useful for adding new packages while keeping everything else locked.
If you were making use of conda-lock before the 1.0 release that added unified lockfiles
you can still get that behaviour by making use of the explicit output kind.
conda-lock --kind explicit -f environment.ymlBy default, conda-lock store its output in conda-lock.yml in the current
working directory. This file will also be used by default for render, install,
and update operations. You can supply a different filename with e.g.
conda-lock --lockfile superspecial.conda-lock.ymlRendered explicit and env lockfiles will be named as "conda-{platform}.lock" and "conda-{platform}.lock.yml respectively by default.
If you want to override that call conda-lock as follows.
conda-lock -k explicit --filename-template "specific-{platform}.conda.lock"Conda-lock will build a spec list from several files if requested.
conda-lock -f base.yml -f specific.yml -p linux-64 -k explicit --filename-template "specific-{platform}.lock"In this case all dependencies are combined, and the ordered union of all channels is used as the final
specification.
This works for all supported file types.
You can override the channels that are used by conda-lock in case you need to override the ones specified in an environment.yml
conda-lock -c conda-forge -p linux-64You may specify the platforms you wish to target by default directly in an environment.yml using the (nonstandard) platforms key:
# environment.yml
channels:
- conda-forge
dependencies:
- python=3.9
- pandas
platforms:
- linux-64
- osx-64
- win-64
- osx-arm64 # For Apple Silicon, e.g. M1/M2
- linux-aarch64 # aka arm64, use for Docker on Apple Silicon
- linux-ppc64leIf you specify target platforms on the command line with -p, these will
override the values in the environment specification. If neither platforms nor
-p are provided, conda-lock will fall back to a default set of platforms.
You can may wish to split your dependencies into separate files for better
organization, e.g. a environment.yml for production dependencies and a
dev-environment.yml for development dependencies. You can assign all the
dependencies parsed from a single file to a category using the (nonstandard)
category key.
# dev-environment.yml
channels:
- conda-forge
dependencies:
- pytest
- mypy=0.910
category: devThe default category is main.
conda-lock can also lock the dependencies.pip section of
environment.yml, using a vendored copy of Poetry's dependency solver.
Right now conda-lock only supports legacy pypi repos with basic auth. Most self-hosted repositories like Nexus, Artifactory etc. use this. You can configure private pip repositories in a similar way to channels, for example:
channels:
- conda-forge
pip-repositories:
- http://$PIP_USER:[email protected]/api/pypi/simple
dependencies:
- python=3.11
- requests=2.26
- pip:
- fake-private-package==1.0.0See the related docs for private channels to understand the rules regarding environment variable substitution.
Alternatively, you can use the poetry configuration file format to configure private PyPi repositories. The configuration file should be named config.toml and have the following format:
[repositories.example]
url = "https://username:[email protected]/simple"The location of this file can be determined with python -c 'from conda_lock._vendor.poetry.locations import CONFIG_DIR; print(CONFIG_DIR)'
Private repositories will be used in addition to pypi.org. For projects using pyproject.toml, it is possible to disable pypi.org entirely.
By default conda-lock will include dev dependencies in the specification of the lock (if the files that the lock is being built from support them). This can be disabled easily
conda-lock --no-dev-dependencies -f ./recipe/meta.yamlUnder some situation you may want to run conda lock in some kind of automated way (eg as a precommit) and want to not need to regenerate the lockfiles if the underlying input specification for that particular lock as not changed.
conda-lock --check-input-hash -p linux-64When the input_hash of the input files, channels match those present in a given lockfile, that lockfile will not be regenerated.
By default conda-lock will leave basic auth credentials for private conda channels in the lock file. If you wish to strip authentication from the file, provide the --strip-auth argument.
conda-lock --strip-auth -f environment.ymlIn order to conda-lock install a lock file with its basic auth credentials stripped, you will need to create an authentication file in .json format like this:
{
"domain": "username:password"
}If you have multiple channels that require different authentication within the same domain, you can additionally specify the channel like this:
{
"domain.org/channel1": "username1:password1",
"domain.org/channel2": "username2:password2"
}You can provide the authentication either as string through --auth or as a filepath through --auth-file.
conda-lock install --auth-file auth.json conda-linux-64.lockConda makes use of virtual packages that are available at runtime to gate dependency on system features. Due to these not generally existing on your local execution platform conda-lock will inject them into the solution environment with a reasonable guess at what a default system configuration should be.
If you want to override which virtual packages are injected you can create a file like
# virtual-packages.yml
subdirs:
linux-64:
packages:
__glibc: "2.17"
__cuda: "11.4"
win-64:
packages:
__cuda: "11.4"conda-lock will automatically use a virtual-packages.yml it finds in the the current working directory. Alternatively one can be specified
explicitly via the flag.
conda lock --virtual-package-spec virtual-packages-cuda.yml -p linux-64Virtual packages take part in the input hash so if you build an environment with a different set of virtual packages the input hash will change.
Additionally the default set of virtual packages may be augmented in future versions of conda-lock. If you desire very stable input hashes
we recommend creating a virtual-packages.yml file to lock down the virtual packages considered.
Micromamba does not presently support some of the overrides to remove all discovered virtual packages, consequently the set of virtual packages available at solve time may be larger than those specified in your specification.
Conda lock supports more than just environment.yml specifications!
Additionally conda-lock supports meta.yaml (conda-build)
and pyproject.toml (
flit, pdm and
poetry based). These do come with some gotchas but
are generally good enough for the 90% use-case.
Conda-lock will attempt to make an educated guess at the desired environment spec in a meta.yaml. This is not guaranteed to work for complex recipes with many selectors and outputs. For multi-output recipes, conda-lock will fuse all the dependencies together. If that doesn't work for your case fall back to specifying the specification as an environment.yml
Since a meta.yaml doesn't contain channel information we make use of the following extra key to specify channels
# meta.yaml
extra:
channels:
- conda-forge
- defaultsSince pyproject.toml files are commonly used by python packages it can be desirable to create a lock
file directly from those dependencies to single-source a package's dependencies. This makes use of some
conda-forge infrastructure (pypi-mapping) to do a lookup of the PyPI package name to a corresponding
conda package name (e.g. docker -> docker-py). In cases where there exists no lookup for the package it assumes that
the PyPI name, and the conda name are the same.
# pyproject.toml
[tool.conda-lock]
channels = [
'conda-forge', 'defaults'
]Like in environment.yml, you can specify default platforms to target:
# pyproject.toml
[tool.conda-lock]
platforms = [
'osx-arm64', 'linux-64'
]If your pyproject.toml file contains optional dependencies/extras these can be referred to by using the --extras flag
# pyproject.toml
[tool.poetry.dependencies]
mandatory = "^1.0"
psycopg2 = { version = "^2.7", optional = true }
mysqlclient = { version = "^1.3", optional = true }
[tool.poetry.extras]
mysql = ["mysqlclient"]
pgsql = ["psycopg2"]
These can be referened as follows
conda-lock --extra mysql --extra pgsql -f pyproject.tomlWhen generating lockfiles that make use of extras it is recommended to make use of --filename-template covered here.
By default conda-lock will attempt to solve for ALL extras/categories it discovers in sources. This allows you to render explicit locks with subset of extras, without needing a new solve.
However this does make the assumption that your extras can all be installed in conjunction with each other. If you want extras filtering
to happen at the solve stage use the flag --filter-extras
conda-lock --extra incompatiblea --filter-extras -f pyproject.tomlSince in a pyproject.toml all the definitions are python dependencies if you need
to specify some non-python dependencies as well this can be accomplished by adding
the following sections to the pyproject.toml
# pyproject.toml
[tool.conda-lock.dependencies]
sqlite = ">=3.34"If a dependency refers directly to a URL rather than a package name and version,
conda-lock will assume it is pip-installable, e.g.:
# pyproject.toml
[tool.poetry.dependencies]
python = "3.9"
pymage = {url = "https://github.com/MickaelRigault/pymage/archive/v1.0.tar.gz#sha256=11e99c4ea06b76ca7fb5b42d1d35d64139a4fa6f7f163a2f0f9cc3ea0b3c55eb"}Similarly, if a dependency is explicitly marked with source = "pypi", it will
be treated as a pip dependency, e.g.:
[tool.poetry.dependencies]
python = "3.9"
ampel-ztf = {version = "^0.8.0-alpha.2", source = "pypi"}A dependency will also be treated as a pip dependency if explicitly marked with source = "pypi" in the [tool.conda-lock.dependencies] section, e.g.:
[tool.conda-lock.dependencies]
ampel-ztf = {source = "pypi"}Alternatively, the above behavior is defaulted for all dependencies defined outside of [tool.conda-lock.dependencies], i.e.:
- Default to
pipdependencies for[tool.poetry.dependencies],[project.dependencies], etc. - Default to
condadependencies for[tool.conda-lock.dependencies]
by explicitly providing default-non-conda-source = "pip" in the [tool.conda-lock] section, e.g.:
[tool.conda-lock]
default-non-conda-source = "pip"In all cases, the dependencies of pip-installable packages will also be
installed with pip, unless they were already requested by a conda
dependency.
To lock only dependencies specified under [tool.conda-lock] (i.e. skipping all dependencies specified elsewhere), explicitly provide skip-non-conda-lock = true in the [tool.conda-lock] section, e.g.:
[tool.conda-lock]
skip-non-conda-lock = trueWhen using private pip repos, it is possible to disable pypi.org entirely. This can be useful when using conda-lock behind a network proxy that does not allow access to pypi.org.
[tool.conda-lock]
allow-pypi-requests = falseIn order to use conda-lock in a docker-style context you want to add the lockfile to the
docker container. In order to refresh the lock file just run conda-lock again.
Given a file tree like
Dockerfile
environment.yaml
* conda-linux-64.lock
You want a dockerfile that is structured something similar to this
# Dockerfile
# Build container
FROM continuumio/miniconda:latest as conda
ADD conda-linux-64.lock /locks/conda-linux-64.lock
RUN conda create -p /opt/env --copy --file /locks/conda-linux-64.lock
# Primary container
FROM gcr.io/distroless/base-debian10
COPY --from=conda /opt/env /opt/env
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