github-merge-pr.sh

   1 #!/bin/bash
   2
   3 # Github repository, just the name/repo part, no .git suffix, no base url!
   4 REPO="openwrt/openwrt"
   5
   6 # Your repository token, generate this token at your profile page:
   7 # - Navigate to https://github.com/settings/tokens
   8 # - Click on "Generate new token"
   9 # - Enter a description, e.g. "pr.sh" and pick the "repo" scope
  10 # - Hit "Generate token"
  11 #TOKEN="d41d8cd98f00b204e9800998ecf8427e"
  12 #
  13 # Uncomment this line to use SSH key to rebase PR branch
  14 # USE_SSH=1
  15
  16 PRID="$1"
  17 BRANCH="${2:-master}"
  18 DRY_RUN="$3"
  19 GIT=git
  20
  21 yesno() {
  22         local prompt="$1"
  23         local default="${2:-n}"
  24         local input
  25
  26         while [ 1 ]; do
  27                 printf "%s y/n [%s] > " "$prompt" "$default"
  28                 read input
  29                 case "${input:-$default}" in
  30                         y*) return 0 ;;
  31                         n*) return 1 ;;
  32                 esac
  33         done
  34 }
  35
  36 if ! command -v jq &> /dev/null; then
  37         echo "jq could not be found! This script require jq!"
  38         exit 1
  39 fi
  40
  41 if [ -z "$PRID" -o -n "${PRID//[0-9]*/}" ]; then
  42         echo "Usage: $0 <PR-ID> [rebase-branch] [dry-run]" >&2
  43         exit 1
  44 fi
  45
  46 if [ -n "$DRY_RUN" ]; then
  47         GIT="echo git"
  48 fi
  49
  50 if [ -z "$(git branch --list "$BRANCH")" ]; then
  51         echo "Given rebase branch '$BRANCH' does not exist!" >&2
  52         exit 2
  53 fi
  54
  55 if ! PR_INFO="$(curl -f -s "https://api.github.com/repos/$REPO/pulls/$PRID")"; then
  56         echo "Failed fetch PR #$PRID info" >&2
  57         exit 3
  58 fi
  59
  60 if [ "$(echo "$PR_INFO" | jq -r ".maintainer_can_modify")" == "false" ]; then
  61         echo "PR #$PRID can't be force pushed by maintainers. Trying to merge as is!" >&2
  62 fi
  63
  64 if [ "$(echo "$PR_INFO" | jq -r ".mergeable")" == "false" ]; then
  65         echo "PR #$PRID is not mergeable for Github.com. Check the PR!" >&2
  66         exit 5
  67 fi
  68
  69 echo "Pulling current $BRANCH from origin"
  70 $GIT checkout $BRANCH
  71 $GIT fetch origin $BRANCH
  72
  73 if ! $GIT rebase origin/$BRANCH; then
  74         echo "Failed to rebase $BRANCH with origin/$BRANCH" >&2
  75         exit 7
  76 fi
  77
  78 PR_USER="$(echo "$PR_INFO" | jq -r ".head.user.login")"
  79 PR_BRANCH="$(echo "$PR_INFO" | jq -r ".head.ref")"
  80 LOCAL_PR_BRANCH="$PR_BRANCH"-"$PR_USER"
  81 if [ "$USE_SSH" = "1" ]; then
  82         PR_REPO="$(echo "$PR_INFO" | jq -r ".head.repo.ssh_url")"
  83 else
  84         PR_REPO="$(echo "$PR_INFO" | jq -r ".head.repo.html_url")"
  85 fi
  86
  87 if ! $GIT remote get-url $PR_USER &> /dev/null || [ -n "$DRY_RUN" ]; then
  88         echo "Adding $PR_USER with repo $PR_REPO to remote"
  89         $GIT remote add  $PR_USER $PR_REPO
  90 fi
  91
  92 echo "Fetching remote $PR_USER"
  93 $GIT fetch $PR_USER $PR_BRANCH
  94
  95 if [ "$(echo "$PR_INFO" | jq -r ".maintainer_can_modify")" == "true" ]; then
  96         echo "Creating branch $LOCAL_PR_BRANCH for $PR_BRANCH"
  97         if ! $GIT checkout -b $LOCAL_PR_BRANCH $PR_USER/$PR_BRANCH; then
  98                 echo "Failed to checkout new branch $PR_BRANCH from $PR_USER/$PR_BRANCH" >&2
  99                 exit 8
 100         fi
 101
 102         echo "Rebasing $LOCAL_PR_BRANCH on top of $BRANCH"
 103         if ! $GIT rebase origin/$BRANCH; then
 104                 echo "Failed to rebase $PR_BRANCH with origin/$BRANCH" >&2
 105                 exit 9
 106         fi
 107
 108         echo "Force pushing $LOCAL_PR_BRANCH to HEAD:$PR_BRANCH for $PR_USER"
 109         if ! $GIT push $PR_USER HEAD:$PR_BRANCH --force; then
 110                 echo "Failed to force push HEAD to $PR_USER" >&2
 111                 exit 10
 112         fi
 113
 114         echo "Returning to $BRANCH"
 115         $GIT checkout $BRANCH
 116 fi
 117
 118 if [ -n "$($GIT log origin/$BRANCH..HEAD)" ]; then
 119         echo "Working on dirty branch for $BRANCH! Please reset $BRANCH to origin/$BRANCH" >&2
 120         exit 11
 121 fi
 122
 123 echo "Actually merging the PR #$PRID from branch $PR_USER/$PR_BRANCH"
 124 if ! $GIT merge --ff-only $PR_USER/$PR_BRANCH; then
 125         echo "Failed to merge $PR_USER/$PR_BRANCH on $BRANCH" >&2
 126 else
 127         if yesno "Push to openwrt $BRANCH" "y"; then
 128                 echo "Pushing to openwrt git server"
 129                 if ! $GIT push; then
 130                         echo "Failed to push to $BRANCH but left branch as is." >&2
 131                         exit 12
 132                 fi
 133
 134                 # Default close comment
 135                 COMMENT="Thanks! Rebased on top of $BRANCH and merged!"
 136
 137                 if [ -n "$TOKEN" ] && [ -z "$DRY_RUN" ]; then
 138                         echo ""
 139                         echo "Enter a comment and hit <enter> to close the PR at Github automatically now."
 140                         echo "Hit <ctrl>-<c> to exit."
 141                         echo ""
 142                         echo "If you do not provide a comment, the default will be: "
 143                         echo "[$COMMENT]"
 144
 145                         echo -n "Comment > "
 146                         read usercomment
 147
 148                         echo "Sending message to PR..."
 149
 150                         comment="${usercomment:-$COMMENT}"
 151                         comment="${comment//\\/\\\\}"
 152                         comment="${comment//\"/\\\"}"
 153                         comment="$(printf '{"body":"%s"}' "$comment")"
 154
 155                         if ! curl -s -o /dev/null -w "%{http_code} %{url_effective}\\n" --user "$TOKEN:x-oauth-basic" --request POST --data "$comment" "https://api.github.com/repos/$REPO/issues/$PRID/comments" || \
 156                         ! curl -s -o /dev/null -w "%{http_code} %{url_effective}\\n" --user "$TOKEN:x-oauth-basic" --request PATCH --data '{"state":"closed"}' "https://api.github.com/repos/$REPO/pulls/$PRID"
 157                         then
 158                                 echo ""                                                     >&2
 159                                 echo "Something failed while sending comment to the PR via ">&2
 160                                 echo "the Github API, please review the state manually at " >&2
 161                                 echo "https://github.com/$REPO/pull/$PRID"                  >&2
 162                                 exit 6
 163                         fi
 164                 fi
 165
 166                 echo -e "\n"
 167                 echo "The PR has been merged!"
 168                 echo -e "\n"
 169         fi
 170 fi
 171
 172 if [ "$(echo "$PR_INFO" | jq -r ".maintainer_can_modify")" == "true" ]; then
 173         echo "Deleting branch $LOCAL_PR_BRANCH"
 174         $GIT branch -D $LOCAL_PR_BRANCH
 175 fi
 176
 177 exit 0