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This is needed in order to mark a certain derivation containing a Nix expression tarball to Hydra so that it is recognised as a channel. When I first got an evaluation error due to using this meta attribute, I was under the impression that nobody outside of Vuizvui[1] is using this feature and that we don't have any occurrence of isHydraChannel in Nixpkgs. However, when working around[2] the issue I assumed that it's not something that should be included in Nixpkgs because we're not using it there. It turned out that my assumption was wrong and we *do* use the attribute in Nixpkgs, namely via releaseTools.channel, which is similar to what we're doing in Vuizvui. Since we already include a bunch of undocumented attributes in metaTypes, it only makes sense to add isHydraChannel as well since it's actually documented in the Hydra documentation[3]. [1]: https://github.com/openlab-aux/vuizvui [2]: openlab-aux/vuizvui@e0685e81b3fdc43a272f0 [3]: https://github.com/NixOS/hydra/blob/53335323ae79ca1a42643f58e520b376898ce641/doc/manual/src/jobs.md#meta-fields Signed-off-by: aszlig <aszlig@nix.build>
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