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Add rebase CI
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‎.github/scripts/rebase_local.sh‎

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#!/bin/bash
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set -eux
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upstream_repo=$1
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# of the form [<branch>:<rebase-target>], e.g.:
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# BA:master B1:master B2:B1 B3:B2
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spec=$2
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{
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git remote add upstream "${upstream_repo}" || true
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git fetch upstream
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output_branches=()
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# sync master with upstream
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git checkout master
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git reset --hard upstream/master
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output_branches+=( "master" )
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# rebase each branch
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mkdir -p rebase
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for branch_spec in ${spec} ; do
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branch=$(echo "${branch_spec}" | awk -F ':' '{ print $1 }')
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(
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rebase_target=$(echo "${branch_spec}" | awk -F ':' '{ print $2 }')
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git checkout "${branch}"
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common_ancestor=$(git merge-base "${branch}" "origin/${rebase_target}")
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[ -e rebase/"${branch}" ] && exit 1
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mkdir -p rebase/"${branch}"
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cd rebase/"${branch}"
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echo "${common_ancestor}" > BASE_COMMIT
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git format-patch "${common_ancestor}".."${branch}"
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if compgen -G "*.patch" > /dev/null; then
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git reset --hard "${rebase_target}"
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git am --3way *.patch
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fi
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)
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output_branches+=( "${branch}" )
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done
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} >&2
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echo "${output_branches[*]}"
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‎.github/scripts/rebase_spec.sh‎

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#!/bin/bash
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# Branch regex we consider for rebase targets.
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# For our purposes this is usually 'stable-haskell/feature/*'.
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# 'master' is always considered.
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branch_regex=$1
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shift 1
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declare -a input_branches
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input_branches=( "$@" )
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set -eu
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[ ${#input_branches[@]} -eq 0 ] &&
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input_branches=( $(gh pr list --label rebase --state open --json headRefName --jq ".[] | select( .headRefName | match(\"${branch_regex}\")) | .headRefName" --template '{{range .}}{{tablerow .headRefName}}{{end}}') )
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branch_list=( )
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declare -A branch_map
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# @FUNCTION: die
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# @USAGE: [msg]
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# @DESCRIPTION:
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# Exits the shell script with status code 2
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# and prints the given message in red to STDERR, if any.
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die() {
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(>&2 red_message "$1")
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exit 2
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}
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# @FUNCTION: red_message
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# @USAGE: <msg>
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# @DESCRIPTION:
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# Print a red message.
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red_message() {
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printf "\\033[0;31m%s\\033[0m\\n" "$1"
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}
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# @FUNCTION: array_contains
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# @USAGE: <arr_ref> <val>
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# @DESCRIPTION:
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# Checks whether the array reference contains the given value.
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# @RETURN: 0 if value exists, 1 otherwise
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array_contains() {
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local -n arr=$1
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local val=$2
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shift 2
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if [[ " ${arr[*]} " =~ [[:space:]]${val}[[:space:]] ]]; then
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return 0
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else
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return 1
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fi
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}
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max_backtrack=10
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# @FUNCTION: backtrack
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# @USAGE: <map_ref> <start_key> <abort_value>
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# @DESCRIPTION:
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# Backtrack dependencies through an array list.
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# E.g. given an associated array with key value pairs of:
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# B1 -> M
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# B2 -> B1
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# B3 -> B2
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#
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# ...if we pass B3 as start_key and M as abort_value, then
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# we receive the flattened ordered list "B1 B2 B3"
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# @STDOUT: space separated list of backtracked values
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backtrack() {
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backtrack_ 0 "$1" "$2" "$3"
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}
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# internal to track backtrack depth
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backtrack_() {
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local depth=$1
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if [[ $depth -gt $max_backtrack ]] ; then
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die "Dependency backtracking too deep... aborting!"
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fi
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shift 1
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if [[ $1 != map ]] ; then
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local -n map=$1
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fi
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local base=$2
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local abort_value=$3
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local value
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if [ "${base}" = "${abort_value}" ] ; then
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return
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fi
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value=${map[$base]}
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if [ "${value}" = "${abort_value}" ] ; then
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if ! array_contains branch_list "${base}" ; then
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echo "${base}"
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fi
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else
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if array_contains branch_list "${base}" ; then
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backtrack_ $((depth++)) map "${map[$value]}" "${abort_value}"
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else
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echo "$(backtrack_ $((depth++)) map "${map[$base]}" "${abort_value}")" "${base}"
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fi
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fi
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}
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{
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# create branch rebase tree
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# we're doing that on the state of the local tree/master
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while IFS= read -r branch || [[ -n $branch ]]; do
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rebase_target=$(git branch --merged "${branch}" --sort="ahead-behind:${branch}" --format="%(refname:short)" | grep -e "${branch_regex}" -e '^master$' | awk 'NR==2{print;exit}')
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# check that rebase target is equal or later than local master
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if [ "${rebase_target}" != "master" ] ; then
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git for-each-ref --contains="master" --format="%(refname)" -- "refs/heads/${branch}" |
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grep --quiet "^refs/heads/${branch}$" ||
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die "rebase target ${rebase_target} seems to be older in the history than the master branch ...aborting!"
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fi
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branch_map["${branch}"]="${rebase_target}"
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done < <(printf '%s\n' "${input_branches[@]}")
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} >&2
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# flatten recursively
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for key in "${!branch_map[@]}"; do
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value=${branch_map[$key]}
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if [ "${value}" = "master" ] ; then
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if ! array_contains branch_list "${key}" ; then
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branch_list+=( "${key}" )
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fi
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else
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# shellcheck disable=SC2207
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branch_list+=( $(backtrack branch_map "$key" "master") )
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fi
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done
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unset key
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result=( )
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for key in "${branch_list[@]}"; do
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result+=( "${key}:${branch_map[$key]}" )
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done
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echo "${result[@]}"
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‎.github/workflows/rebase.yaml‎

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name: Rebase against upstream
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on:
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schedule:
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- cron: '0 0 * * *'
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workflow_dispatch:
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permissions:
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contents: write
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issues: write
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pull-requests: read
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jobs:
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rebase:
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name: Rebase now!
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runs-on: ubuntu-latest
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env:
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UPSTREAM_REPO: https://github.com/haskell/cabal.git
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BRANCH_PREFIX: sh-rebase
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outputs:
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rebase_output_json: ${{ steps.rebase.outputs.branches_json }}
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rebase_output: ${{ steps.rebase.outputs.branches }}
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steps:
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- name: Checkout code
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uses: actions/checkout@v4
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with:
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fetch-depth: 0
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persist-credentials: false
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- id: rebase
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name: rebase
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run: |
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set -eux
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gh repo set-default stable-haskell/cabal
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git config checkout.defaultRemote origin
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# required to apply patches
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git config user.email "[email protected]"
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git config user.name "GitHub CI"
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# this does not push
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branch_spec=$(bash .github/scripts/rebase_spec.sh '^stable-haskell/feature/.*')
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rebased_branches=( $(bash .github/scripts/rebase_local.sh ${{ env.UPSTREAM_REPO }} "${branch_spec}") )
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echo "branches_json=$(jq --compact-output --null-input '$ARGS.positional' --args -- "${rebased_branches[@]}")" >> "$GITHUB_OUTPUT"
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echo "branches=${rebased_branches[*]}" >> "$GITHUB_OUTPUT"
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shell: bash
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env:
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GH_TOKEN: ${{ github.token }}
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- if: always()
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name: backup
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run: |
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git checkout -f master || true
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git archive master > backup.tar
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tar -rf backup.tar .git rebase
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- if: always()
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name: Upload artifact
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uses: actions/upload-artifact@v4
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with:
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if-no-files-found: error
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retention-days: 7
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name: backup
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path: |
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./backup.tar
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release-workflow:
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needs: ["rebase"]
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uses: ./.github/workflows/reusable-release.yml
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with:
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branches: ${{ needs.rebase.outputs.rebase_output_json }}
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ghc: "9.6.7"
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cabal: "3.12.1.0"
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push-job:
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runs-on: ubuntu-latest
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needs: [rebase, release-workflow]
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steps:
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- run: |
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set -eux
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# now push to temp branches
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for branch in ${{ needs.rebase.outputs.rebase_output_json }} ; do
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git checkout "${branch}"
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remote_branch="${{ env.BRANCH_PREFIX }}/${branch}"
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echo "git push https://${{ secrets.REBASE_PAT }}@github.com/${{ github.repository }}.git ${branch}:${remote_branch}"
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done
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shell: bash
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env:
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GH_TOKEN: ${{ github.token }}
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notify-job:
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runs-on: ubuntu-latest
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needs: [release-workflow]
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if: ${{ always() && contains(needs.*.result, 'failure') }}
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steps:
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- name: Checkout code
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uses: actions/checkout@v4
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# create an issue with a link to the workflow run on failure
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- run: |
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set -eux
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gh repo set-default stable-haskell/cabal
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for issue in $(gh issue list --label rebase-failure --json url -q '.[] | .url') ; do
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gh issue close "${issue}"
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done
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gh issue create --title "Rebase failed on $(date -u +"%Y-%m-%d")" --label rebase-failure --body "${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}"
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env:
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GH_TOKEN: ${{ github.token }}
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‎.github/workflows/release.yaml‎

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push:
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branches:
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- stable-haskell/master
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- sh-rebase/**
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tags:
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- 'v*'
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- 'cabal-install-*'

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