NixOS/hydra

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Hydra, the Nix-based continuous build system [maintainers=@dasj,@Ericson2314]

Stars: 1.6k
Forks: 358
Open beginner issues: 0
Indexed issues: 338
Avg merge: 20h 30m
Merged PRs (30d): 27

Dominant language: PLpgSQL
License: GPL-3.0
Last GitHub push: Sep 9, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: No beginner labels indexed

Beginner friendly Everything

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338 open issues indexed

Allow hydra to support garbage collect previous versions or unused builds Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

NixOS/hydra#1909 · Opened Sep 19, 2026
hydra-queue-runner's tokio-rt-worker crashes Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 48/100

NixOS/hydra#1907 · 1 comment · Opened Sep 18, 2026
Socket activate the manual too Open

Difficulty 3/5 1-2 days Newbie friendliness 58/100

NixOS/hydra#1905 · Opened Sep 15, 2026
`.ls` listings uploaded to `cache.nixos.org` no longer contain `narOffset` Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 68/100

NixOS/hydra#1883 · 2 comments · Opened Aug 28, 2026
Valid FOD hash rejected? Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 48/100

NixOS/hydra#1860 · Opened Aug 17, 2026
hydraqueuerunner_steps metrics with machine_type labels Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 55/100

NixOS/hydra#1816 · Opened Jun 27, 2026
Queue-runner has jobs stuck connecting for hours Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 38/100

NixOS/hydra#1815 · Opened Jun 26, 2026
evaluation often gets stuck after succeeding (no other evals until restarting the service) Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 45/100

NixOS/hydra#1812 · 4 comments · Opened Jun 24, 2026
Continuous delivery for staging-hydra Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

NixOS/hydra#1808 · 1 comment · 1 reaction · Opened Jun 23, 2026
[new HQR] unexplained failures in various builds Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 38/100

NixOS/hydra#1806 · 2 comments · Opened Jun 19, 2026
[new HQR] queue builder uploaded to a wrong NAR path on S3 Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 38/100

NixOS/hydra#1804 · 23 comments · 6 reactions · Opened Jun 18, 2026
Metrics that expose reached capacity limits of queue-builders Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

NixOS/hydra#1799 · Opened Jun 17, 2026
Queue-builder should allow no supported-features Open

Difficulty 2/5 1-3 hours Newbie friendliness 72/100

NixOS/hydra#1796 · 1 comment · Opened Jun 17, 2026
Unable to log in with GitHub Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 58/100

NixOS/hydra#1787 · Opened Jun 6, 2026
gRPC builder stream silently dies, builder never reconnects Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

NixOS/hydra#1674 · Opened Apr 19, 2026
Intermitant test failures that I noticed Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 32/100

NixOS/hydra#1649 · 2 comments · Opened Apr 7, 2026
hydra-queue-runner busy loops when postgres goes away Open

bug

NixOS/hydra#1594 · 1 assignee · Opened Mar 24, 2026
Web server serving user manual is misconfiugred Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 45/100

NixOS/hydra#1574 · 3 comments · 2 reactions · Opened Feb 23, 2026
Incorrect build number given to a dependency in `#tabs-build-deps` page Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 45/100

NixOS/hydra#1569 · Opened Feb 2, 2026
Git hashes still truncated too much Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

NixOS/hydra#1566 · 2 comments · Opened Jan 28, 2026
More GitHub notifications Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

NixOS/hydra#1563 · 3 reactions · Opened Jan 23, 2026
Pretty log and raw log don't match Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 45/100

NixOS/hydra#1562 · Opened Jan 20, 2026
hydra_machine_build_duration_bucket Prometheus labels changed unintentionally Open

bug www

Difficulty 4/5 3-5 days Newbie friendliness 35/100

NixOS/hydra#1561 · 2 comments · Opened Jan 20, 2026
S3 bucket is out of sync with Hydra state Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

NixOS/hydra#1545 · Opened Dec 8, 2025
Support relative paths in hydra-build-products to enable relocatable derivations Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

NixOS/hydra#1544 · 1 comment · 2 reactions · Opened Dec 5, 2025
README talks about classic-style Nix expressions but provides commands that use flakes Open

Difficulty 1/5 1-3 hours Newbie friendliness 55/100

NixOS/hydra#1538 · Opened Nov 18, 2025
GitLab statuses are not published for new source revisions when the evaluation does not change Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 45/100

NixOS/hydra#1519 · 1 reaction · Opened Sep 9, 2025
Machine status doesn't show in-progress builds on localhost Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 35/100

NixOS/hydra#1515 · 7 reactions · Opened Aug 29, 2025
Add to the API a way to search for builds of a particular package Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

NixOS/hydra#1491 · 1 comment · 1 reaction · Opened Jun 27, 2025
Machine status shows every machine twice Open

bug infra

Difficulty 4/5 3-5 days Newbie friendliness 30/100

NixOS/hydra#1477 · 8 comments · 3 reactions · Opened Apr 13, 2025
queue-monitor and dispatcher metrics missing Open

bug infra

Difficulty 3/5 1-2 days Newbie friendliness 35/100

NixOS/hydra#1476 · 6 comments · 3 reactions · Opened Apr 13, 2025
Derivations built locally that have dependencies built remotely hang indefinitely on "Sending inputs" Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 25/100

NixOS/hydra#1448 · Opened Feb 24, 2025
Clarify hydra-notify `eval_failed` Open

Difficulty 3/5 1-2 days Newbie friendliness 38/100

NixOS/hydra#1434 · 1 comment · Opened Jan 30, 2025
A route or endpoint to get the state of all jobs in a jobset. Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

NixOS/hydra#1432 · 1 reaction · Opened Jan 7, 2025
hydra-api.yaml returns an object when getting evals causing deserialization to fail Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 35/100

NixOS/hydra#1430 · 6 comments · Opened Dec 9, 2024
Add semantic versioning to hydra-api.yaml Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

NixOS/hydra#1428 · Opened Dec 4, 2024
hydra-eval-jobs crashes with SIGSEGV when evaluating a specific nixos toplevel Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 25/100

NixOS/hydra#1409 · 2 comments · Opened Sep 19, 2024
Patchelf inputs in hydra manual need updating Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

NixOS/hydra#1407 · 1 comment · Opened Sep 6, 2024
hydra-notify prometheus metrics with IPv6 Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 45/100

NixOS/hydra#1394 · 1 comment · 1 reaction · Opened Jul 20, 2024
transient failure building due to unresolved derivations when building ca-derivations with an s3 store Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 25/100

NixOS/hydra#1393 · 1 comment · 1 reaction · Opened Jul 17, 2024
dashboard/my-jobs: discover maintained packages also by github ID Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

NixOS/hydra#1391 · 1 reaction · Opened Jun 20, 2024
"attribute '%s' is %s, which is not supported" error silently discarded, leading to continuous retrying of evaluation Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 45/100

NixOS/hydra#1390 · Opened Jun 17, 2024
Field `compress_num_threads` declared twice break the cache. Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 55/100

NixOS/hydra#1389 · Opened Jun 12, 2024
The GitLab status plugin should be able to be manually disabled Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

NixOS/hydra#1376 · Opened May 1, 2024
Hydra dual writes to >= 2 locations Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

NixOS/hydra#1367 · 4 comments · Opened Mar 3, 2024
Hydra signs with >= 2 sets of keys Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

NixOS/hydra#1366 · 2 comments · 2 reactions · Opened Mar 3, 2024
Document how to build a NixOS system toplevel Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

NixOS/hydra#1365 · 5 comments · 2 reactions · Opened Feb 25, 2024
Full support for a database connection pooler like pgbouncer Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

NixOS/hydra#1358 · 3 comments · Opened Feb 5, 2024
Git submodules not checked out in flake project, even with '?submodules=1' in flake uri. Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

NixOS/hydra#1353 · 1 comment · Opened Jan 27, 2024
compress_build_logs and upload_logs_to_binary_cache are mutually exclusive and badly conflict with one another Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

NixOS/hydra#1338 · 3 reactions · Opened Jan 12, 2024

NixOS/hydra

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