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
, stableVersion ? false # Use version format according to RFC 107 (i.e. LAST_TAG+date=YYYY-MM-DD)
, tagPrefix ? "" # strip this prefix from a tag name when using stable version
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}:
let
updateScript = writeShellScript "unstable-update-script.sh" ''
set -ex
url=""
branch=""
use_stable_version=""
tag_prefix=""
while (( $# > 0 )); do
flag="$1"
shift 1
case "$flag" in
--url=*)
url="''${flag#*=}"
;;
--branch=*)
branch="''${flag#*=}"
;;
--use-stable-version)
use_stable_version=1
;;
--tag-prefix=*)
tag_prefix="''${flag#*=}"
;;
*)
echo "$0: unknown option ''${flag}"
exit 1
;;
esac
done
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# By default we set url to src.url
if [[ -z "$url" ]]; then
url="$(${nix}/bin/nix-instantiate $systemArg --eval -E \
"with import ./. {}; $UPDATE_NIX_ATTR_PATH.src.gitRepoUrl" \
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| tr -d '"')"
fi
# Get info about HEAD from a shallow git clone
tmpdir="$(${coreutils}/bin/mktemp -d)"
cloneArgs=(
--bare
--depth=1
)
if [[ -n "$branch" ]]; then
cloneArgs+=(--branch="$branch")
fi
${git}/bin/git clone "''${cloneArgs[@]}" "$url" "$tmpdir"
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pushd "$tmpdir"
commit_date="$(${git}/bin/git show -s --pretty='format:%cs')"
commit_sha="$(${git}/bin/git show -s --pretty='format:%H')"
if [[ -z "$use_stable_version" ]]; then
new_version="unstable-$commit_date"
else
depth=100
while (( $depth < 10000 )); do
last_tag="$(${git}/bin/git describe --tags --abbrev=0 2> /dev/null || true)"
if [[ -n "$last_tag" ]]; then
break
fi
${git}/bin/git fetch --depth="$depth" --tags
depth=$(( $depth * 2 ))
done
if [[ -z "$last_tag" ]]; then
echo "Cound not found a tag within last 10000 commits" > /dev/stderr
exit 1
fi
if [[ -n "$tag_prefix" ]]; then
last_tag="''${last_tag#$tag_prefix}"
fi
new_version="$last_tag+date=$commit_date"
fi
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popd
# ${coreutils}/bin/rm -rf "$tmpdir"
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# update the nix expression
${common-updater-scripts}/bin/update-source-version \
"$UPDATE_NIX_ATTR_PATH" \
"$new_version" \
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--rev="$commit_sha"
'';
in [
updateScript
"--url=${builtins.toString url}"
] ++ lib.optionals (branch != null) [
"--branch=${branch}"
] ++ lib.optionals stableVersion [
"--use-stable-version"
"--tag-prefix=${tagPrefix}"
]