1 files changed, 40 insertions, 0 deletions
diff --git a/nixpkgs/pkgs/test/nixpkgs-check-by-name/scripts/update-pinned-tool.sh b/nixpkgs/pkgs/test/nixpkgs-check-by-name/scripts/update-pinned-tool.sh
new file mode 100755
index 000000000000..dbc6e91df08a
--- /dev/null
+++ b/nixpkgs/pkgs/test/nixpkgs-check-by-name/scripts/update-pinned-tool.sh
@@ -0,0 +1,40 @@
+#!/usr/bin/env nix-shell
+#!nix-shell -i bash -p jq
+
+set -o pipefail -o errexit -o nounset
+
+trace() { echo >&2 "$@"; }
+
+SCRIPT_DIR=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
+
+# Determined by `runs-on: ubuntu-latest` in .github/workflows/check-by-name.yml
+CI_SYSTEM=x86_64-linux
+
+channel=nixos-unstable
+pin_file=$SCRIPT_DIR/pinned-tool.json
+
+trace -n "Fetching latest version of channel $channel.. "
+# This is probably the easiest way to get Nix to output the path to a downloaded channel!
+nixpkgs=$(nix-instantiate --find-file nixpkgs -I nixpkgs=channel:"$channel")
+trace "$nixpkgs"
+
+# This file only exists in channels
+rev=$(<"$nixpkgs/.git-revision")
+trace -e "Git revision of channel $channel is \e[34m$rev\e[0m"
+
+trace -n "Fetching the prebuilt version of nixpkgs-check-by-name for $CI_SYSTEM.. "
+# This is the architecture used by CI, we want to prefetch the exact path to avoid having to evaluate Nixpkgs
+ci_path=$(nix-build --no-out-link "$nixpkgs" \
+    -A tests.nixpkgs-check-by-name \
+    --arg config '{}' \
+    --argstr system "$CI_SYSTEM" \
+    --arg overlays '[]' \
+    -j 0 \
+    | tee /dev/stderr)
+
+trace "Updating $pin_file"
+jq -n \
+    --arg rev "$rev" \
+    --arg ci-path "$ci_path" \
+    '$ARGS.named' \
+    > "$pin_file"