nixos-modules: escape % in HYDRA_DATABASE_URL - #1858
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Ericson2314 merged 1 commit intoAug 13, 2026
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The default database URL reaches Postgres over a Unix socket, so its
"host" is a percent-encoded directory: `%2Frun%2Fpostgresql`. systemd
reads `%` in `Environment=` as the start of a specifier, fails to resolve
`%2`, and drops the whole assignment:
Failed to resolve specifiers in HYDRA_DATABASE_URL=..., ignoring: Invalid slot
The services then fall back to `postgres:///hydra`, which carries no
user, so libpq connects as the service's own Unix user — `hydra-www`,
`hydra-queue-runner` — and peer auth rejects it, since the `hydra-users`
ident map only maps those to the `hydra` role. The `install` test saw
this as a 500 from the web UI.
Double the `%` on the copies bound for systemd; see the comment on
`dbUrlWithAppName`. `environment.variables` is a plain shell environment
and the queue runner reads its URL from TOML, so neither needs it.
Assisted-by: Claude Code (Opus 5)
Ericson2314
enabled auto-merge
August 13, 2026 23:25
Ericson2314
disabled auto-merge
August 13, 2026 23:25
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The default database URL reaches Postgres over a Unix socket, so its "host" is a percent-encoded directory:
%2Frun%2Fpostgresql. systemd reads%inEnvironment=as the start of a specifier, fails to resolve%2, and drops the whole assignment:The services then fall back to
postgres:///hydra, which carries no user, so libpq connects as the service's own Unix user —hydra-www,hydra-queue-runner— and peer auth rejects it, since thehydra-usersident map only maps those to thehydrarole. Theinstalltest saw this as a 500 from the web UI.Double the
%on the copies bound for systemd; see the comment ondbUrlWithAppName.environment.variablesis a plain shell environment and the queue runner reads its URL from TOML, so neither needs it.Assisted-by: Claude Code (Opus 5)