nixpkgs: filter out old nixpkgs versions

Author: Mic92

nix/sources.json

@@ -1,122 +1,5 @@
 {
   "pins": {
-    "18.09": {
-      "type": "Git",
-      "repository": {
-        "type": "GitHub",
-        "owner": "nixos",
-        "repo": "nixpkgs"
-      },
-      "branch": "nixos-18.09",
-      "submodules": false,
-      "revision": "a7e559a5504572008567383c3dc8e142fa7a8633",
-      "url": "https://github.com/nixos/nixpkgs/archive/a7e559a5504572008567383c3dc8e142fa7a8633.tar.gz",
-      "hash": "16j95q58kkc69lfgpjkj76gw5sx8rcxwi3civm0mlfaxxyw9gzp6"
-    },
-    "19.03": {
-      "type": "Git",
-      "repository": {
-        "type": "GitHub",
-        "owner": "nixos",
-        "repo": "nixpkgs"
-      },
-      "branch": "nixos-19.03",
-      "submodules": false,
-      "revision": "34c7eb7545d155cc5b6f499b23a7cb1c96ab4d59",
-      "url": "https://github.com/nixos/nixpkgs/archive/34c7eb7545d155cc5b6f499b23a7cb1c96ab4d59.tar.gz",
-      "hash": "11z6ajj108fy2q5g8y4higlcaqncrbjm3dnv17pvif6avagw4mcb"
-    },
-    "19.09": {
-      "type": "Git",
-      "repository": {
-        "type": "GitHub",
-        "owner": "nixos",
-        "repo": "nixpkgs"
-      },
-      "branch": "nixos-19.09",
-      "submodules": false,
-      "revision": "75f4ba05c63be3f147bcc2f7bd4ba1f029cedcb1",
-      "url": "https://github.com/nixos/nixpkgs/archive/75f4ba05c63be3f147bcc2f7bd4ba1f029cedcb1.tar.gz",
-      "hash": "157c64220lf825ll4c0cxsdwg7cxqdx4z559fdp7kpz0g6p8fhhr"
-    },
-    "20.03": {
-      "type": "Git",
-      "repository": {
-        "type": "GitHub",
-        "owner": "nixos",
-        "repo": "nixpkgs"
-      },
-      "branch": "nixos-20.03",
-      "submodules": false,
-      "revision": "1db42b7fe3878f3f5f7a4f2dc210772fd080e205",
-      "url": "https://github.com/nixos/nixpkgs/archive/1db42b7fe3878f3f5f7a4f2dc210772fd080e205.tar.gz",
-      "hash": "05k9y9ki6jhaqdhycnidnk5zrdzsdammbk5lsmsbz249hjhhgcgh"
-    },
-    "20.09": {
-      "type": "Git",
-      "repository": {
-        "type": "GitHub",
-        "owner": "nixos",
-        "repo": "nixpkgs"
-      },
-      "branch": "nixos-20.09",
-      "submodules": false,
-      "revision": "1c1f5649bb9c1b0d98637c8c365228f57126f361",
-      "url": "https://github.com/nixos/nixpkgs/archive/1c1f5649bb9c1b0d98637c8c365228f57126f361.tar.gz",
-      "hash": "0f2nvdijyxfgl5kwyb4465pppd5vkhqxddx6v40k2s0z9jfhj0xl"
-    },
-    "21.05": {
-      "type": "Git",
-      "repository": {
-        "type": "GitHub",
-        "owner": "nixos",
-        "repo": "nixpkgs"
-      },
-      "branch": "nixos-21.05",
-      "submodules": false,
-      "revision": "022caabb5f2265ad4006c1fa5b1ebe69fb0c3faf",
-      "url": "https://github.com/nixos/nixpkgs/archive/022caabb5f2265ad4006c1fa5b1ebe69fb0c3faf.tar.gz",
-      "hash": "12q00nbd7fb812zchbcnmdg3pw45qhxm74hgpjmshc2dfmgkjh4n"
-    },
-    "21.11": {
-      "type": "Git",
-      "repository": {
-        "type": "GitHub",
-        "owner": "nixos",
-        "repo": "nixpkgs"
-      },
-      "branch": "nixos-21.11",
-      "submodules": false,
-      "revision": "eabc38219184cc3e04a974fe31857d8e0eac098d",
-      "url": "https://github.com/nixos/nixpkgs/archive/eabc38219184cc3e04a974fe31857d8e0eac098d.tar.gz",
-      "hash": "04ffwp2gzq0hhz7siskw6qh9ys8ragp7285vi1zh8xjksxn1msc5"
-    },
-    "22.05": {
-      "type": "Git",
-      "repository": {
-        "type": "GitHub",
-        "owner": "nixos",
-        "repo": "nixpkgs"
-      },
-      "branch": "nixos-22.05",
-      "submodules": false,
-      "revision": "380be19fbd2d9079f677978361792cb25e8a3635",
-      "url": "https://github.com/nixos/nixpkgs/archive/380be19fbd2d9079f677978361792cb25e8a3635.tar.gz",
-      "hash": "154x9swf494mqwi4z8nbq2f0sp8pwp4fvx51lqzindjfbb9yxxv5"
-    },
-    "22.11": {
-      "type": "Git",
-      "repository": {
-        "type": "GitHub",
-        "owner": "nixos",
-        "repo": "nixpkgs"
-      },
-      "branch": "nixos-22.11",
-      "submodules": false,
-      "revision": "ea4c80b39be4c09702b0cb3b42eab59e2ba4f24b",
-      "url": "https://github.com/nixos/nixpkgs/archive/ea4c80b39be4c09702b0cb3b42eab59e2ba4f24b.tar.gz",
-      "hash": "1xi53rlslcprybsvrmipm69ypd3g3hr7wkxvzc73ag8296yclyll"
-    },
     "23.05": {
       "type": "Git",
       "repository": {

nix/update-nixpkgs-releases.nix

@@ -22,8 +22,16 @@ writeShellApplication {
       | rg '^([0-9a-f]+)\trefs/heads/nixos-(\d\d\.\d\d)$' -or '$2' \
       | sort --reverse --version-sort \
       | while read -r version; do
+          major_version=$(echo "$version" | cut -d. -f1)
+          # filter out very old nixpkgs versions
+          if [ "$major_version" -lt 23 ]; then
+            if npins -d nix show | grep -q "$version"; then
+              npins -d nix remove "$version"
+            fi
+            continue
+          fi
 
-        if ! jq -e --arg version "$version" 'has($ARGS.named.version)' nix/sources.json >/dev/null; then
+        if ! npins -d nix show | grep -q "$version"; then
           npins -d nix add  --name "$version" github nixos nixpkgs --branch "nixos-$version"
         fi
       done