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| 22 Apr 2026 |
| manueljacob | Hi! Which settings do I have to set to get stable source paths in debug information? The debug information grabbed from cache.nixos.org has paths starting with /build/ while anything built locally has paths starting with e.g. /nix/var/nix/builds/nix-1361222-3717692701. | 00:23:25 |
| manueljacob | The problem was that nix silently ignored the sandbox = true setting. | 10:27:50 |
 raboof | That sounds surprising indeed. Are you on NixOS or another distro? How did you set it? | 11:13:58 |
| manueljacob | I’m running in a Docker container. I manually set to sandbox = true in nix.conf. When passing --privileged to podman (Docker clone) in addition to that, it worked. | 14:58:42 |
| manueljacob | This probably should be a warning instead of debug print: https://github.com/NixOS/nix/blob/cd16aee6c1343f1b1e48f6506f7c99327a2352bc/src/libstore/unix/build/derivation-builder.cc#L2132 | 15:03:59 |
| raboof | yeah that'd make sense to me | 15:04:47 |
| manueljacob | Better even, the default should be to use it if possible. If it is explicitly requested but it is not possible, it should be an error. | 15:10:09 |
| manueljacob | To get on-topic again... Is there an easy way to find regressing formerly reproducible builds? | 15:11:33 |
| manueljacob | E.g., when making a change to binutils, how can I check whether it broke reproducibility of some package? | 15:12:12 |
