Texinfo failing to download on staging

[r-burns]

Since #138063:

https://hydra.nixos.org/build/153907889/nixlog/3

error: unable to download 'https://ftpmirror.gnu.org/texinfo/texinfo-6.8.tar.xz': Couldn't resolve host name (6)
builder for '/nix/store/8x8fismhjkqwcl5qc2rq2zpm70sm9vv7-texinfo-6.8.tar.xz.drv' failed with exit code 1

cc @trofi

[trofi]

Fetch works locally here:

$ nix-prefetch-url https://ftpmirror.gnu.org/texinfo/texinfo-6.8.tar.xz
path is '/nix/store/ycj1q918l6852kndr75rlwmw43k5ybys-texinfo-6.8.tar.xz'
1i7yb7mrp3inz25zbzv2pllr4y7d58v818f1as7iz8mw53nm7dw

I wonder if it's related to nix-daemon's bug in fetching new tarballs:

• Nix 2.3.15 Sandbox Domain Resolution Failures nix#5089
• nix: fixup sandbox dns resolution failure #137197

Tl;DR is: nix-daemon sometimes does not initialize glibc's NSS before entering chroot and fails to do it afterwards. #137197 will fix it but will also require builder update.

[vcunat]

Yes, it's certainly that nix bug. I don't know... perhaps we can do the same as in the previous case: 28b6a91 I'm not aware of anything better I can do (personally) about this.

[trofi]

Would using nixUnstable instead of nix on hydra builder be an option until nix is fixed? (AFAIU nixUnstable already has the fix). Or too risky to get bugs creep in?

[vcunat]

It's unblocked now, though the underlying problem still isn't fixed.