Reputation: 7705
I'm building a Haskell project with Nix, with CI done by a Hydra server. One thing I would like to do is embed the git SHA in the application itself, that way the SHA can be included in our exception reports and as a header in HTTP responses (to check that the latest server is running).
It's easy to pull the SHA from the .git
directory in my dev environment using a package like https://hackage.haskell.org/package/gitrev, but it appears that Hydra doesn't have that directory present after cloning (I added some Template Haskell logging that confirmed that doesDirectoryExist <PWD>.git
is false).
Is there a way to get the git SHA from Hydra somehow? Either by including the git directory so I can get the SHA myself, or some other way?
Hydra version: SNAPSHOT-b11789f39993c614e53da39c29711b63cd266291 (using nix-2.0.4)
Edit: I also sshed into the worker server and confirmed there is no .git
directory present where the build is being done:
[maximiliantagher@ip-10-0-2-46:/tmp]$ sudo ls -a nix-build-mercury-web-backend-0.0.0.drv-0/szjq4m1zklbydw7wrz7dbbxl9ndw0d0f-source
. app db Dockerfile Gemfile.lock .ghcid Makefile one-off-task README.md shell.nix stack.yaml
.. config .dir-locals.el docs gemset.nix .gitignore mercury-web-backend.cabal package.yaml release.nix sql-scripts templates
API-Spec data dist Gemfile .ghci .hlint.yaml .nix Rakefile Setup src test
Upvotes: 3
Views: 776
Reputation: 7705
By default Hydra will delete the .git
folder, preventing you from reading the git SHA. You can tell it not to do this by setting the NIX_PREFETCH_GIT_LEAVE_DOT_GIT
to "1"
.
If you are building Hydra using the release.nix file in its repo, you would add --set NIX_PREFETCH_GIT_LEAVE_DOT_GIT "1"
after the other --set
s in the file: https://github.com/NixOS/hydra/blob/1c44de1779d0e315615b072049fb2d2ce333fb32/release.nix#L155-L157
Upvotes: 2