[Nix-dev] build-chroot-dirs mount problem

[Federico Sacerdoti]

Hello,

I've been using NIX for years, and like it very much. I'm trying to build a package (R, one of my favorites) in a chroot environment. I'm using nix-1.5.3 and running with multiple build users, etc.

$ cat /etc/nix/nix.conf
build-users-group = nix-builders
use-sqlite-wal = false

# TODO: This disrupts any script with #!/bin/bash
build-use-chroot = true

# Try for building R
build-chroot-dirs = /bin=/nix/store/7mjplwq1r0agngqj2058hl5z8kb3w15g-bash-4.2-p42/bin

When I try to build I see on stderr:

error: failed to set up the build environment for `/nix/store/hlll5ykl3dbfpmrkz6j64xh8a7ifz30k-R-3.0.1-7.drv'

When I strace the nix-daemon I see a strange call to mount:

26146 lstat("/dev/shm", {st_mode=S_IFDIR|S_ISVTX|0777, st_size=200, ...}) = 0
26146 mount("none", "/nix/store/hlll5ykl3dbfpmrkz6j64xh8a7ifz30k-R-3.0.1-7.drv.chroot/dev/shm", "tmpfs", 0, NULL) = -1 ENOENT (No such file or directory)
26146 futex(0x7feca7bcd1a4, FUTEX_WAKE_PRIVATE, 2147483647) = 0
26146 write(2, "build error: mounting /dev/shm: No such file or directory\n", 58) = 58

Seems this fails because the source = "none", which doesn't exist (ENOENT). I must be doing something wrong.

Thanks
FDS

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