nixpkgs/pkgs/common-updater/unstable-updater.nix

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{ lib
, writeShellScript
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, coreutils
, git
, nix
, common-updater-scripts
}:
# This is an updater for unstable packages that should always use the latest
# commit.
{ url ? null # The git url, if empty it will be set to src.url
, branch ? null
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}:
let
updateScript = writeShellScript "unstable-update-script.sh" ''
set -ex
url="$1"
# By default we set url to src.url
if [[ -z "$url" ]]; then
url="$(${nix}/bin/nix-instantiate $systemArg --eval -E \
"with import ./. {}; $UPDATE_NIX_ATTR_PATH.src.url" \
| tr -d '"')"
fi
# Get info about HEAD from a shallow git clone
tmpdir="$(${coreutils}/bin/mktemp -d)"
${git}/bin/git clone --bare --depth=1 \
${lib.optionalString (branch != null) "--branch ${branch}"} \
"$url" "$tmpdir"
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pushd "$tmpdir"
commit_date="$(${git}/bin/git show -s --pretty='format:%cs')"
commit_sha="$(${git}/bin/git show -s --pretty='format:%H')"
popd
${coreutils}/bin/rm -rf "$tmpdir"
# update the nix expression
${common-updater-scripts}/bin/update-source-version \
"$UPDATE_NIX_ATTR_PATH" \
"unstable-$commit_date" \
--rev="$commit_sha"
'';
in [ updateScript url ]