tvl-depot/tools/releases/default.nix

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# Definitions for simple release mechanisms from depot.
{ depot, lib, pkgs, ... }:
let
inherit (lib.strings) makeBinPath sanitizeDerivationName;
in
{
# Use a josh filter to push a certain subset of canon to another git
# repository.
#
# This expects, of course, that the remote repository has granted
# push access to the CI SSH key.
filteredGitPush = { filter, remote, ref ? "refs/heads/canon" }: {
label = ":git: push '${filter}' to external git repository";
branches = [ "refs/heads/canon" ];
postBuild = true;
command = pkgs.writeShellScript "${sanitizeDerivationName filter}-push" ''
set -e
export PATH="${makeBinPath [ pkgs.git depot.third_party.josh ]}:$PATH"
echo 'Filtering depot through ${filter}'
josh-filter '${filter}'
echo 'Fetching remote to check if a push is needed'
git fetch '${remote}' '${ref}'
if git merge-base --is-ancestor FILTERED_HEAD FETCH_HEAD; then
echo 'Commit already present, nothing to push.'
exit 0
fi
echo 'Pushing filtered repository to ${remote}:${ref}'
git push '${remote}' 'FILTERED_HEAD:${ref}'
'';
};
}