Previously when packages that required the git fetcher were updated, we
would wrongly rely on `nix-prefetch-url`, which would reliable break the
hash.
Instead we need to use `nix-prefetch-git` to determine the proper hash,
when the relevant attributes are present.
`ghc-pkg list` tells us everything hackage2nix needs to know. In the
past the core-packages list and compiler setting in hackage2nix was
maintained manually which inevitably leads to it being forgot once in a
while – this will then mess with flag resolution when generating the
package set in some cases. Luckily, we can just let a simple derivation
do this for us.
Resolves#202621.
Since we now have a versioned configuration-ghc-*.nix file for GHC HEAD,
we don't need to add a super special case to the package set logic in
test-configurations.nix anymore. We can just create a versioned
attribute for the ghcHEAD package set (which is not exposed) and keep
using the normal discovery logic.
The only tricky bit is that GHC HEAD's configuration file is named after
the GHC release that will be branched off from it, so a little bit of
arithmetic is involved.
This will allow tests.pkg-config.defaultPkgConfigPackages to run on
hydra without breaking the tarball job.
Regarding the use of null, I'll quote 473ac96 which does lib.hydraJob.
By allowing null, we allow code to avoid filterAttrs, improving
laziness in real world use cases.
Specifically, this strategy prevents infinite recursion errors,
performance issues and possibly other errors that are unrelated to
the user's code.
The Haskell Hydra report generator
(`maintainers/scripts/haskell/hydra-report.hs`) uses this
`maintainer-handles.nix` script for generating a mapping of email
addresses to GitHub handles.
This `maintainer-handles.nix` script is necessary because the Haskell
Hydra report generator gets Hydra job status info as input, but needs to
ping users on GitHub. Hydra job status info only contains user emails (not
GitHub handles). So the `maintainer-handles.nix` script is necessary
for looking up GitHub handles from email addresses.
This commit fixes the `maintainers-handles.nix` code to ignore
maintainers that don't have email addresses. The code was originally
assuming that all maintainers have email addresses, but there was
recently a maintainer added without an email address.
Move the manpage-to-URL mapping to `doc/manpage-urls.json` so that we can
reuse that file elsewhere, and generate the `link-manpages.lua` filter from
that file.
Also modify the Pandoc filter so that it doesn't wrap manpages that are
already inside a link.
Keeping a Lua filter is essential for speed: a Python filter would
increase the runtime `md-to-db.sh` from ~20s to ~30s (but Python is not
to blame; marshalling Pandoc types to and from JSON is a costly operation).
Parsing in Lua seems tedious, so I went with the Nix way.
- use `restrict-eval` so that we're not affected by the user's environment
- use jq instead of the horrible echo+sed hack
The second point also fixes the indentation before each line to be two
spaces instead of one, so I set it back to one space to avoid a diff.
