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1 # Pinch
2
3 PIN CHannels - a simple drop-in replacement for `nix-channel --update`.
4
5 Example usage, being invoked on the example "channels" file included here:
6
7 $ python3 pinch.py pin channels
8 $ python3 pinch.py update channels
9
10
11 The first "pin" command will add these fields to the file:
12
13 [nixos]
14 channel_url = https://channels.nixos.org/nixos-20.03
15 git_repo = https://github.com/NixOS/nixpkgs.git
16 git_ref = nixos-20.03
17 +release_name = nixos-20.03beta1155.29eddfc36d7
18 +tarball_url = https://releases.nixos.org/nixos/20.03/nixos-20.03beta1155.29eddfc36d7/nixexprs.tar.xz
19 +tarball_sha256 = 9c1d182af2af64e5e8799e256a4a6dc1fed324ba06cb5f76c938dc63b64f0959
20 +git_revision = 29eddfc36d720dcc4822581175217543b387b1e8
21
22 [nixos-hardware]
23 git_repo = https://github.com/NixOS/nixos-hardware.git
24 git_ref = master
25 +release_name = nixos-hardware.git-1585241157-edb7199b5c4
26 +git_revision = edb7199b5c4f1db34a7253d4cabf6cf690521a92
27
28 The second "update" command applies these changes to your nix channels, like `nix-channel --update` does.
29
30 ### Feature comparison
31
32 | Feature | nix-channel | [require.nix][] | [niv][] | [flakes][] | pinch |
33 | ---------------------------- | :---------: | :-------------: | :-----: | :--------: | :---: |
34 | Same version across machines | - | yes | yes | yes | yes |
35 | Verifies hashes | - | ? | yes | yes | yes |
36 | Fetch from git | - | ? | yes | yes | yes |
37 | Fetch from git with ssh key | - | ? | yes | yes? | yes |
38 | command_not_found_handle | yes | ? | - | yes | yes |
39 | Verifies tarball == git repo | - | - | - | - | yes |
40 | Rejects force pushes | - | - | - | - | yes |
41 | Ready to use today | yes | - | yes | - | yes |
42
43 [require.nix]: https://www.youtube.com/watch?v=DHOLjsyXPtM
44 [niv]: https://github.com/nmattia/niv
45 [flakes]: https://github.com/nixos/rfcs/pull/49