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If DNS resolution fails, is retried, and then is successful, then updating a flake will use the incorrect path. #1170

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opened 2026-03-28 19:17:54 +00:00 by 9p4 · 0 comments
9p4 commented 2026-03-28 19:17:54 +00:00
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Describe the bug

Running nix flake update when DNS is not online but comes online on the second try causes flake updates for Lix to use paths ending in main.tar.gz?narHash=... instead of a stable identifier.

Steps To Reproduce

I'm not sure how to mimic a DNS delay for the first query.

  1. Run nix flake update lix with a DNS server that has >5 second delay for first query
  2. Lix should resolve correctly on attempt two.
  3. Observe different URL (https://git.lix.systems/lix-project/lix/archive/main.tar.gz) in flake.lock

Expected behavior

I expect the retry to return the correct Lix repo URL ie https://git.lix.systems/api/v1/repos/lix-project/lix/archive/...b1.tar.gz?rev=... instead of https://git.lix.systems/lix-project/lix/archive/main.tar.gz

nix --version output

nix (Lix, like Nix) 2.96.0-dev-pre20260319-dev_774f957
System type: x86_64-linux
Additional system types: aarch64-linux, i686-linux
Features: gc, signed-caches
System configuration file: /etc/nix/nix.conf
User configuration files: /home/ersei/.config/nix/nix.conf:/etc/xdg/nix/nix.conf:/home/ersei/.local/state/nix/profile/etc/xdg/nix/nix.conf:/etc/profiles/per-user/ersei/etc/xdg/nix/nix.conf:/home/ersei/.nix-profile/etc/xdg/nix/nix.conf:/nix/profile/etc/xdg/nix/nix.conf:/home/ersei/.local/state/nix/profile/etc/xdg/nix/nix.conf:/etc/profiles/per-user/ersei/etc/xdg/nix/nix.conf:/nix/var/nix/profiles/default/etc/xdg/nix/nix.conf:/run/current-system/sw/etc/xdg/nix/nix.conf
Store directory: /nix/store
State directory: /nix/var/nix
Data directory: /nix/store/s7ys1ksrmr42d9vm2nnl9sry49b084mf-lix-2.96.0-dev-pre20260319-dev_774f957/share

Additional context

dnscrypt-proxy2 is my broken DNS resolver that has trouble after suspend with timeouts...

## Describe the bug Running `nix flake update` when DNS is not online but comes online on the second try causes flake updates for Lix to use paths ending in `main.tar.gz?narHash=...` instead of a stable identifier. ## Steps To Reproduce I'm not sure how to mimic a DNS delay for the first query. 1. Run `nix flake update lix` with a DNS server that has >5 second delay for first query 2. Lix should resolve correctly on attempt two. 3. Observe different URL (`https://git.lix.systems/lix-project/lix/archive/main.tar.gz`) in flake.lock ## Expected behavior I expect the retry to return the correct Lix repo URL ie `https://git.lix.systems/api/v1/repos/lix-project/lix/archive/...b1.tar.gz?rev=...` instead of `https://git.lix.systems/lix-project/lix/archive/main.tar.gz` ## `nix --version` output ``` nix (Lix, like Nix) 2.96.0-dev-pre20260319-dev_774f957 System type: x86_64-linux Additional system types: aarch64-linux, i686-linux Features: gc, signed-caches System configuration file: /etc/nix/nix.conf User configuration files: /home/ersei/.config/nix/nix.conf:/etc/xdg/nix/nix.conf:/home/ersei/.local/state/nix/profile/etc/xdg/nix/nix.conf:/etc/profiles/per-user/ersei/etc/xdg/nix/nix.conf:/home/ersei/.nix-profile/etc/xdg/nix/nix.conf:/nix/profile/etc/xdg/nix/nix.conf:/home/ersei/.local/state/nix/profile/etc/xdg/nix/nix.conf:/etc/profiles/per-user/ersei/etc/xdg/nix/nix.conf:/nix/var/nix/profiles/default/etc/xdg/nix/nix.conf:/run/current-system/sw/etc/xdg/nix/nix.conf Store directory: /nix/store State directory: /nix/var/nix Data directory: /nix/store/s7ys1ksrmr42d9vm2nnl9sry49b084mf-lix-2.96.0-dev-pre20260319-dev_774f957/share ``` ## Additional context dnscrypt-proxy2 is my broken DNS resolver that has trouble after suspend with timeouts...
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make lix go faster

  
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lix-project/lix#1170
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