cabal-constraints: Repeatable builds for cabalized Haskell projects.
Repeatable builds for cabalized Haskell projects
'cabal-constraints' provides repeatable builds for cabalized Haskell projects by "freezing" the exact versions of the dependencies selected by 'cabal-install'. All build environments for the project, such as the test or staging build environments, or other developers collaborating on the project, will then use the same dependency versions.
It is designed to be used alongside 'cabal-install' sandboxes, in which case isolated, repeatable builds can be achieved.
'cabal-constraints' should be run from the root directory of a cabalized Haskell project and given the path to the `setup-config` file to use. It will print out all dependencies of the project in a format suitable for use in a `cabal-install` config file. For example, running 'cabal-constraints' against itself produces the following:
$ cabal-constraints dist/dist-sandbox-500003c6/setup-config constraints: Cabal == 1.19.0 , array == 0.4.0.1 , base == 184.108.40.206 , bytestring == 0.10.0.2 , containers == 0.5.0.0 , deepseq == 220.127.116.11 , directory == 18.104.22.168 , filepath == 22.214.171.124 , ghc-prim == 0.3.0.0 , integer-gmp == 0.5.0.0 , old-locale == 126.96.36.199 , pretty == 188.8.131.52 , process == 184.108.40.206 , rts == 1.0 , time == 220.127.116.11 , unix == 18.104.22.168
A single mandatory argument must be provided which is the path to the
setup-config file to use. The file will be located under the
directory. Usually there will be a single
setup-config file which can be
found by running
find dist -name setup-config from the root directory of the
project. If your project has more than one such file, it is likely because
you have built it either with and without sandboxes or with multiple
sandboxes. You probably want the most recently modified file which can be
ls -tr $( find dist -name setup-config ) | tail -n1.
To use these constraints for reproducible builds, one should make use of the
new sandbox feature of
cabal-install 1.18. The constraints can be redirected
cabal.config and committed to your code repository. When the project is
built, the same set of dependency versions will be resolved by
ensuring repeatable builds.
cabal.config contains no other information the simplest solution is to
$ cabal-constraints > cabal.config
cabal.config contains information that needs to be preserved, the
following will replace the
constraints section and everything following it
with the new constraints. If you ensure that the
constraints section is the
last section of the file, all other information in it will be kept.
$ sed -i /^constraints:/,$d cabal.config && cabal-constraints >> cabal.config
|Versions [RSS] [faq]||0.0.0.1|
|Dependencies||base (==4.6.*), Cabal (>=1.18), optparse-applicative (>=0.5.2.1) [details]|
|Source repo||head: git clone https://github.com/benarmston/cabal-constraints.git|
|Uploaded||by BenArmston at 2013-12-08T22:03:44Z|
|Downloads||1180 total (8 in the last 30 days)|
|Rating||(no votes yet) [estimated by Bayesian average]|
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