fetchTarball does not support hard links

[holaguz]

Describe the bug

A custom derivation using fetchTarball suddenly stopped building.

Full error log

evaluating file '<nix/derivation-internal.nix>'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/default.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/lib/minver.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/top-level/impure.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/top-level/default.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/lib/default.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/lib/fixed-points.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/lib/trivial.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/lib/lists.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/stdenv/booter.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/stdenv/default.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/lib/systems/default.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/lib/attrsets.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/lib/systems/inspect.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/lib/systems/architectures.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/lib/systems/parse.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/lib/strings.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/lib/types.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/lib/systems/platforms.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/lib/modules.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/top-level/config.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/lib/options.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/stdenv/linux/default.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/stdenv/linux/bootstrap-tools/default.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/top-level/stage.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/stdenv/adapters.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/build-support/trivial-builders/default.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/top-level/splice.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/top-level/by-name-overlay.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/top-level/all-packages.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/top-level/aliases.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/stdenv/generic/default.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/lib/customisation.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/build-support/bintools-wrapper/default.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/stdenv/generic/make-derivation.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/lib/asserts.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/development/tools/misc/binutils/default.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/servers/x11/xorg/default.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/servers/x11/xorg/overrides.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/build-support/cc-wrapper/default.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/stdenv/generic/check-meta.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/lib/meta.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/stdenv/linux/bootstrap-files/x86_64-unknown-linux-gnu.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/stdenv/linux/bootstrap-files/i686-unknown-linux-gnu.nix'
evaluating file '<nix/fetchurl.nix>'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/development/tools/misc/patchelf/default.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/development/compilers/gcc/all.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/development/compilers/gcc/versions.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/development/compilers/gcc/default.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/lib/versions.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/development/compilers/gcc/common/libgcc.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/development/compilers/gcc/common/builder.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/development/compilers/gcc/common/checksum.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/development/libraries/glibc/default.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/development/libraries/glibc/common.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/os-specific/linux/kernel-headers/default.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/development/libraries/gmp/6.x.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/development/libraries/isl/0.20.0.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/development/libraries/isl/generic.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/development/libraries/libmpc/default.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/development/libraries/mpfr/default.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/lib/licenses.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/lib/systems/doubles.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/development/compilers/gcc/common/meta.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/maintainers/team-list.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/development/libraries/zlib/default.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/build-support/fetchurl/boot.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/development/libraries/gnu-config/default.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/development/libraries/gettext/default.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/shells/bash/5.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/shells/bash/bash-5.2-patches.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/development/tools/parsing/bison/default.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/development/tools/misc/gnum4/default.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/build-support/fetchurl/mirrors.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/development/interpreters/perl/default.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/development/interpreters/perl/intepreter.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/development/libraries/libxcrypt/default.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/tools/compression/xz/default.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/build-support/expand-response-params/default.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/development/compilers/gcc/common/extra-target-flags.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/development/compilers/gcc/common/dependencies.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/development/compilers/gcc/common/configure-flags.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/development/compilers/gcc/common/platform-flags.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/development/tools/misc/texinfo/7.0.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/development/tools/misc/texinfo/common.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/tools/system/which/default.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/development/compilers/gcc/patches/default.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/build-support/nuke-references/default.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/development/compilers/gcc/common/pre-configure.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/development/compilers/gcc/common/strip-attributes.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/development/interpreters/python/default.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/development/interpreters/python/cpython/default.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/development/interpreters/python/passthrufun.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/tools/compression/bzip2/default.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/development/libraries/expat/default.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/development/libraries/libffi/default.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/development/tools/misc/autoconf/default.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/development/tools/misc/automake/automake-1.16.x.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/development/tools/misc/libtool/libtool2.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/tools/misc/file/default.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/build-support/pkg-config-wrapper/default.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/development/tools/misc/pkg-config/default.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/development/tools/misc/autoconf-archive/default.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/development/interpreters/python/setup-hook.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/development/libraries/libidn2/default.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/development/libraries/libunistring/default.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/tools/misc/coreutils/default.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/development/libraries/acl/default.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/tools/text/gnugrep/default.nix'
evaluating file '/nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/tools/text/gawk/default.nix'
downloading 'https://www.gaisler.com/anonftp/bcc2/bin/bcc-2.2.1-gcc-linux64.tar.xz'...
error:
       … while calling the 'derivationStrict' builtin
         at <nix/derivation-internal.nix>:9:12:
            8|
            9|   strict = derivationStrict drvAttrs;
             |            ^
           10|

       … while evaluating derivation 'gaisler-bcc-2.2.1'
         whose name attribute is located at /nix/store/sa8wlkyv4zvzkrx2a034ikfsn7iaj2k3-nixos-23.11-23.11/nixos-23.11/pkgs/stdenv/generic/make-derivation.nix:348:7

       … while evaluating attribute 'src' of derivation 'gaisler-bcc-2.2.1'
         at /tmp/nix-bug/toolchain.nix:11:7:
           10|       name = "gaisler-bcc-${version}";
           11|       src = builtins.fetchTarball {
             |       ^
           12|         url = tarballUrl;

       (stack trace truncated; use '--show-trace' to show the full trace)

       error: file 'bcc-2.2.1-gcc/bin/sparc-gaisler-elf-gcc' in tarball has unsupported file type

When importing the nix file using the repl, the error seems to appear after downloading a few MBs:

nix-repl> import ./toolchain.nix { pkgs = import <nixos-23.11> {}; }
{
[15.1/355.2 MiB DL] downloading 'https://www.gaisler.com/anonftp/bcc2/bin/bcc-2.2.1-gcc-linux64.tar.xz'«error: file 'bcc-2.2.1-gcc/bin/sparc-gaisler-elf-gcc' in tarball has unsupported file type»;
}

---

I was able to reproduce the error on both 23.11 and unstable channels, in two separate pcs:

• PC 1 (Arch 6.6.23 LTS):

  • Linux hera 6.6.23-1-lts #1 SMP PREEMPT_DYNAMIC Wed, 27 Mar 2024 07:47:20 +0000 x86_64 GNU/Linux
  • nix-env (Nix) 2.21.1

• PC 2 (Arch 6.8.2):

  • Linux artemis 6.8.2-arch2-1 #1 SMP PREEMPT_DYNAMIC Thu, 28 Mar 2024 17:06:35 +0000 x86_64 GNU/Linux
  • nix-env (Nix) 2.21.1

I couldn't reproduce it on the following computer:

• PC 3 (Ubuntu 22.04 LTS):
  • Linux TITAN 6.5.0-26-generic #26~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Tue Mar 12 10:22:43 UTC 2 x86_64 x86_64 x86_64 GNU/Linux
  • nix-env (Nix) 2.19.2

---

You can find the MRE down below:

toolchain.nix

{ pkgs }:

let
  version = "2.2.1";
  hash = "097z15zshr4711rzfr8ccwl8vzpxp7da573p89qmngxzrwxr4kwl";
  tarballUrl = "https://www.gaisler.com/anonftp/bcc2/bin/bcc-${version}-gcc-linux64.tar.xz";

  bccToolchain = pkgs.stdenv.mkDerivation
    {
      name = "gaisler-bcc-${version}";
      src = builtins.fetchTarball {
        url = tarballUrl;
        sha256 = hash;
      };

    };

in { inherit bccToolchain; }

Feel free to ping me if I missed any details.

[holaguz]

Oops, wrong repo.

Opened a new issue on nixpkgs: NixOS/nixpkgs#301376

[holaguz]

Reopening this after the following comment: NixOS/nixpkgs#301376 (comment)

[pho]

I'm also I'm triggering the same error on Arch & nix 2.21.1:

$ nix repl --expr 'builtins.fetchTarball { url = "http://more.musl.cc/11.2.1/x86_64-linux-musl/x86_64-linux-musl-cross.tgz"; }'
Nix 2.21.1
Type :? for help.
error:
       … while calling the 'fetchTarball' builtin
         at «string»:1:1:
            1| builtins.fetchTarball { url = "http://more.musl.cc/11.2.1/x86_64-linux-musl/x86_64-linux-musl-cross.tgz"; }
             | ^

       error: file 'x86_64-linux-musl-cross/bin/x86_64-linux-musl-gcc' in tarball has unsupported file type

Looks like the files which fetchTarball complains about are hardlinks, which (TIL) tar knows how to preserve
Repacking the tgz files with tar --hard-dereference solves this, so my workaround has been to repack it, serve it locally and fetch it.

EDIT: I just updated to nix 2.21.2, and its still happening

[pho]

In case it's any help, I have git-bisected this and looks like cabee98 might be the culprit

[holaguz]

The error is an exception being thrown on this file:

nix/src/libutil/tarfile.cc

Line 223 in 3fd8dfe

throw Error("file '%s' in tarball has unsupported file type", path);

Meaning the file is neither AE_IFDIR, AE_IFREG, or AE_IFLNK. For reference, these are the filetypes defined for libarchive:

man 3 archive_entry_stat:

   General accessor functions
       The functions archive_entry_filetype() and archive_entry_set_filetype() get respectively  set  the
       filetype.  The file type is one of the following constants:
             AE_IFREG   Regular file
             AE_IFLNK   Symbolic link
             AE_IFSOCK  Socket
             AE_IFCHR   Character device
             AE_IFBLK   Block device
             AE_IFDIR   Directory
             AE_IFIFO   Named pipe (fifo)

That's as far as I could dig since I'm not familiar with the source code nor libarchive.

---

Looks like the files which fetchTarball complains about are hardlinks, which (TIL) tar knows how to preserve

In my case bin/sparc-gaisler-elf-gcc is indeed a hardlink to bin/sparc-gaisler-elf-gcc-10.2.0

[thufschmitt]

Per https://github.com/libarchive/libarchive/blob/341800da257fb8c31b8b4281604fb7e3436b61f3/libarchive/archive_read_support_format_tar.c#L1219 , it seems like libarchive doesn't really use these accessor functions when unpacking tarfiles, but reads the tartype instead (both seem to be in sync, except for hardlinks which aren't handled by the AE_IF* family and for which archive_entry_filetype returns 0).

Maybe unpackTarfileToSink should follow that behavior.

---

For a more self-contained reproducer:

$ mkdir archive                        
$ touch archive/foo         
$ ln archive/foo archive/bar
$ tar cf archive.tar archive
$ nix-instantiate --eval --expr 'builtins.fetchTarball "file://'$PWD'/archive.tar"'
error:
       … while calling the 'fetchTarball' builtin
         at «string»:1:1:
            1| builtins.fetchTarball "file:///home/thufschmitt/Repos/nixos/nix/work/archive.tar"
             | ^

       error: file 'archive/bar' in tarball has unsupported file type

[thufschmitt]

Maybe unpackTarfileToSink should follow that behavior.

Contributions for that welcome ;)