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Nix, the purely functional package manager
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John Rinehart 591a826c7f fix: better support dangling revisions 
The submodules branch generates a checkout which depends on only the
references, not all revisions. If there are dangling revisions in the
bare fetcher clone (a correctness issue itself) then the subsequent
temporary directory clone will disastrously fail with messages like
```
fatal: reference is not a tree: 2da0785fa32ce4c628d501c8743c88be00835b50
```
You should be able to reproduce this behavior with
```bash

this_nixpkgs='github:nixos/nixpkgs?rev=36ac8d7e411eeb11ac0998d5a39e329c1226e541';
this_git=$(nix build --print-out-paths "$this_nixpkgs#git")/bin/git;

export GIT_AUTHOR_NAME=foo \
	GIT_AUTHOR_EMAIL=foo@foo.foo \
	GIT_AUTHOR_DATE=100000000 \
	GIT_COMMITER_NAME=foo \
	GIT_COMMITER_EMAIL=foo@foo.foo \
	GIT_COMMITTER_DATE=100000000;

tmpgit=$(mktemp -d);
echo "Repo'll be at $tmpgit";

"$this_git" init "$tmpgit";

"$this_git" -C "$tmpgit" commit --allow-empty -m "foo"; # 8c2146823865b76da067b3bb458611a0a19ede3b
"$this_git" -C "$tmpgit" commit --allow-empty -m "foo"; # 2da0785fa32ce4c628d501c8743c88be00835b50
"$this_git" -C "$tmpgit" reset --hard HEAD~1; # 8c2146823865b76da067b3bb458611a0a19ede3b

for version in 18 19 20 21 22 23 24; do
    echo "Checking nix version 2.$version";
    this_nix=$(nix build "$this_nixpkgs#nixVersions.nix_2_$version^out" --print-out-paths)/bin/nix;

    url="file:///$tmpgit";

    # populate fetcher-v1.sqlite and the gitv3/ dir
    "$this_nix-build" --expr $'builtins.fetchGit {
        url = \"'"$url"$'\";
        rev = \"8c2146823865b76da067b3bb458611a0a19ede3b\";
        submodules = true;
    }';

    # put the "corrupted" git dir in place of the fetched one
    cache_dir="${XDG_CONFIG_HOME:-$HOME}"/.cache/nix/gitv3;
    tmp=$(mktemp);
    printf "%s" "$url" >"$tmp";
    fetched_dir="$cache_dir"/$(printf "%s" "$url" | $this_nix --extra-experimental-features nix-command hash file --type sha256 --base32 "$tmp");
    rm -rf "$fetched_dir";
    git clone --bare "$tmpgit" "$fetched_dir";

    # See if we can realise the derivation pointing to the dangling commit
    _NIX_FORCE_HTTP=1 "$this_nix-build" --impure --expr $'
    { pkgs ? (import <nixpkgs> { }) }: pkgs.stdenv.mkDerivation {
      pname = "foo";
      version = "1.0.0";
      dontUnpack = true;

      '"
      src = builtins.fetchGit {
        url = \"file:///$tmpgit\";
        rev = \"2da0785fa32ce4c628d501c8743c88be00835b50\";
        submodules = true;
      };

      buildPhase = ''
        touch \$out;
        exit 0;
      '';
    }
    "
done
```
This solution attempts to avoid the issue in the submodules path by
simply checking out the specified revision (in addition to all
references to preserve the original behavior - although, I think _only_
the revision is necessary).
2024-11-11 10:01:38 -08:00
.github ci.yml: Blanket update tests job 2024-10-14 18:48:01 +02:00
config Run autoupdate 2021-06-01 11:42:38 +02:00
contrib function-trace: always show the trace 2019-09-18 23:23:21 +02:00
doc Typo 2024-09-26 00:18:08 +02:00
m4 autoconf: Fix C++17 detection not working on Ubuntu 16.04. 2019-07-03 04:32:25 +02:00
maintainers maintainers: add note on marking PRs as draft 2023-06-19 10:55:34 +02:00
misc Choose a reasonable number similar to LimitNOFile 2023-07-07 07:52:16 -07:00
mk Put functional tests in tests/functional 2023-12-01 12:06:43 -05:00
perl Allow dynamic derivation deps in inputDrvs 2023-09-07 10:39:37 -04:00
scripts Merge branch '2.18-maintenance' into mergify/bp/2.18-maintenance/pr-10919 2024-09-10 23:39:51 -04:00
src fix: better support dangling revisions 2024-11-11 10:01:38 -08:00
tests TMP: make buld-remote tests more verbose 2024-10-21 15:52:25 +02:00
.dir-locals.el .dir-locals.el: Set c-block-comment-prefix 2020-07-10 11:21:06 +02:00
.editorconfig Add .editorconfig 2017-06-05 22:57:28 +01:00
.gitignore Move tests to separate directories, and document 2023-12-01 13:05:03 -05:00
.version Bump version 2024-09-26 11:58:04 +02:00
boehmgc-coroutine-sp-fallback.diff Always disable GC in a coroutine unless the patch is applied 2023-04-07 14:54:38 +02:00
bootstrap.sh bootstrap: Simplify & make more robust. 2011-09-06 12:11:05 +00:00
configure.ac Require at least libseccomp 2.5.5 2024-04-24 23:41:46 +02:00
CONTRIBUTING.md Put functional tests in tests/functional 2023-12-01 12:06:43 -05:00
COPYING * Change this to LGPL to keep the government happy. 2006-04-25 16:41:06 +00:00
default.nix add flake-compat to flake.nix and use sha256 in default.nix 2023-03-06 21:11:24 +01:00
docker.nix fix "add an option to include flake-registry..." 2023-05-16 14:35:31 +02:00
flake.lock flake.lock: Update 2023-12-01 11:08:15 -05:00
flake.nix flake.nix: Add hydraJobs.tests.fetchurl 2024-10-14 15:52:21 +02:00
local.mk Enable -Werror=switch-enum 2023-04-03 18:45:20 +02:00
Makefile Move tests to separate directories, and document 2023-12-01 13:05:03 -05:00
Makefile.config.in Generate API docs with Doxygen 2023-03-10 12:51:06 -05:00
precompiled-headers.h Config: Use nlohmann/json 2020-08-20 11:02:16 +02:00
README.md Improve hacking.md 2023-02-13 12:00:00 +04:00
shell.nix Remove url literals 2022-01-24 13:28:21 +01:00

README.md

Nix

Open Collective supporters Test

Nix is a powerful package manager for Linux and other Unix systems that makes package management reliable and reproducible. Please refer to the Nix manual for more details.

Installation

On Linux and macOS the easiest way to install Nix is to run the following shell command (as a user other than root):

$ curl -L https://nixos.org/nix/install | sh

Information on additional installation methods is available on the Nix download page.

Building And Developing

See our Hacking guide in our manual for instruction on how to to set up a development environment and build Nix from source.

Additional Resources

License

Nix is released under the LGPL v2.1.