47 lines
1.8 KiB
Bash
Executable file
47 lines
1.8 KiB
Bash
Executable file
#!/usr/bin/env bash
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# Fetches the prebuilt nixpkgs-check-by-name to use from
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# the NixOS channel corresponding to the given base branch
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set -o pipefail -o errexit -o nounset
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trace() { echo >&2 "$@"; }
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if (( $# < 2 )); then
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trace "Usage: $0 BASE_BRANCH OUTPUT_PATH"
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trace "BASE_BRANCH: The base branch to use, e.g. master or release-23.11"
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trace "OUTPUT_PATH: The output symlink path for the tool"
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exit 1
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fi
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baseBranch=$1
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output=$2
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trace -n "Determining the channel to use for PR base branch $baseBranch.. "
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if [[ "$baseBranch" =~ ^(release|staging|staging-next)-([0-9][0-9]\.[0-9][0-9])$ ]]; then
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# Use the release channel for all PRs to release-XX.YY, staging-XX.YY and staging-next-XX.YY
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preferredChannel=nixos-${BASH_REMATCH[2]}
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else
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# Use the nixos-unstable channel for all other PRs
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preferredChannel=nixos-unstable
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fi
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# Check that the channel exists. It doesn't exist for fresh release branches
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if curl -fSs "https://channels.nixos.org/$preferredChannel"; then
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channel=$preferredChannel
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trace "$channel"
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else
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# Fall back to nixos-unstable, makes sense for fresh release branches
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channel=nixos-unstable
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trace -e "\e[33mWarning: Preferred channel $preferredChannel could not be fetched, using fallback: $channel\e[0m"
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fi
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trace -n "Fetching latest version of channel $channel.. "
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# This is probably the easiest way to get Nix to output the path to a downloaded channel!
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nixpkgs=$(nix-instantiate --find-file nixpkgs -I nixpkgs=channel:"$channel")
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trace "$nixpkgs"
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# This file only exists in channels
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trace -e "Git revision of channel $channel is \e[34m$(<"$nixpkgs/.git-revision")\e[0m"
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trace -n "Fetching the prebuilt version of nixpkgs-check-by-name.. "
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nix-build -o "$output" "$nixpkgs" -A tests.nixpkgs-check-by-name -j 0 >/dev/null
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realpath "$output" >&2
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