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 PRID="$1"
  14 BRANCH="${2:-master}"
  15 DRY_RUN="$3"
  16 GIT=git
  17
  18 yesno() {
  19         local prompt="$1"
  20         local default="${2:-n}"
  21         local input
  22
  23         while [ 1 ]; do
  24                 printf "%s y/n [%s] > " "$prompt" "$default"
  25                 read input
  26                 case "${input:-$default}" in
  27                         y*) return 0 ;;
  28                         n*) return 1 ;;
  29                 esac
  30         done
  31 }
  32
  33 if ! command -v jq &> /dev/null; then
  34         echo "jq could not be found! This script require jq!"
  35         exit 1
  36 fi
  37
  38 if [ -z "$PRID" -o -n "${PRID//[0-9]*/}" ]; then
  39         echo "Usage: $0 <PR-ID> [rebase-branch] [dry-run]" >&2
  40         exit 1
  41 fi
  42
  43 if [ -n "$DRY_RUN" ]; then
  44         GIT="echo git"
  45 fi
  46
  47 if [ -z "$(git branch --list "$BRANCH")" ]; then
  48         echo "Given rebase branch '$BRANCH' does not exist!" >&2
  49         exit 2
  50 fi
  51
  52 if ! PR_INFO="$(curl -f -s "https://api.github.com/repos/$REPO/pulls/$PRID")"; then
  53         echo "Failed fetch PR #$PRID info" >&2
  54         exit 3
  55 fi
  56
  57 if [ "$(echo "$PR_INFO" | jq -r ".maintainer_can_modify")" == "false" ]; then
  58         echo "PR #$PRID can't be force pushed by maintainers. Trying to merge as is!" >&2
  59 fi
  60
  61 if [ "$(echo "$PR_INFO" | jq -r ".mergeable")" == "false" ]; then
  62         echo "PR #$PRID is not mergeable for Github.com. Check the PR!" >&2
  63         exit 5
  64 fi
  65
  66 echo "Pulling current $BRANCH from origin"
  67 $GIT checkout $BRANCH
  68 $GIT fetch origin $BRANCH
  69
  70 if ! $GIT rebase origin/$BRANCH; then
  71         echo "Failed to rebase $BRANCH with origin/$BRANCH" >&2
  72         exit 7
  73 fi
  74
  75 PR_USER="$(echo "$PR_INFO" | jq -r ".head.user.login")"
  76 PR_BRANCH="$(echo "$PR_INFO" | jq -r ".head.ref")"
  77 LOCAL_PR_BRANCH="$PR_BRANCH"-"$PR_USER"
  78 PR_REPO="$(echo "$PR_INFO" | jq -r ".head.repo.html_url")"
  79
  80 if ! $GIT remote get-url $PR_USER &> /dev/null || [ -n "$DRY_RUN" ]; then
  81         echo "Adding $PR_USER with repo $PR_REPO to remote"
  82         $GIT remote add  $PR_USER $PR_REPO
  83 fi
  84
  85 echo "Fetching remote $PR_USER"
  86 $GIT fetch $PR_USER $PR_BRANCH
  87
  88 if [ "$(echo "$PR_INFO" | jq -r ".maintainer_can_modify")" == "true" ]; then
  89         echo "Creating branch $LOCAL_PR_BRANCH for $PR_BRANCH"
  90         if ! $GIT checkout -b $LOCAL_PR_BRANCH $PR_USER/$PR_BRANCH; then
  91                 echo "Failed to checkout new branch $PR_BRANCH from $PR_USER/$PR_BRANCH" >&2
  92                 exit 8
  93         fi
  94
  95         echo "Rebasing $LOCAL_PR_BRANCH on top of $BRANCH"
  96         if ! $GIT rebase origin/$BRANCH; then
  97                 echo "Failed to rebase $PR_BRANCH with origin/$BRANCH" >&2
  98                 exit 9
  99         fi
 100
 101         echo "Force pushing $LOCAL_PR_BRANCH to HEAD:$PR_BRANCH for $PR_USER"
 102         if ! $GIT push $PR_USER HEAD:$PR_BRANCH --force; then
 103                 echo "Failed to force push HEAD to $PR_USER" >&2
 104                 exit 10
 105         fi
 106
 107         echo "Returning to $BRANCH"
 108         $GIT checkout $BRANCH
 109 fi
 110
 111 if [ -n "$($GIT log origin/$BRANCH..HEAD)" ]; then
 112         echo "Working on dirty branch for $BRANCH! Please reset $BRANCH to origin/$BRANCH" >&2
 113         exit 11
 114 fi
 115
 116 echo "Actually merging the PR #$PRID from branch $PR_USER/$PR_BRANCH"
 117 if ! $GIT merge --ff-only $PR_USER/$PR_BRANCH; then
 118         echo "Failed to merge $PR_USER/$PR_BRANCH on $BRANCH" >&2
 119 else
 120         if yesno "Push to openwrt $BRANCH" "y"; then
 121                 echo "Pushing to openwrt git server"
 122                 if ! $GIT push; then
 123                         echo "Failed to push to $BRANCH but left branch as is." >&2
 124                         exit 12
 125                 fi
 126
 127                 # Default close comment
 128                 COMMENT="Thanks! Rebased on top of $BRANCH and merged!"
 129
 130                 if [ -n "$TOKEN" ] && [ -z "$DRY_RUN" ]; then
 131                         echo ""
 132                         echo "Enter a comment and hit <enter> to close the PR at Github automatically now."
 133                         echo "Hit <ctrl>-<c> to exit."
 134                         echo ""
 135                         echo "If you do not provide a comment, the default will be: "
 136                         echo "[$COMMENT]"
 137
 138                         echo -n "Comment > "
 139                         read usercomment
 140
 141                         echo "Sending message to PR..."
 142
 143                         comment="${usercomment:-$COMMENT}"
 144                         comment="${comment//\\/\\\\}"
 145                         comment="${comment//\"/\\\"}"
 146                         comment="$(printf '{"body":"%s"}' "$comment")"
 147
 148                         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" || \
 149                         ! 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/$PRID"
 150                         then
 151                                 echo ""                                                     >&2
 152                                 echo "Something failed while sending comment to the PR via ">&2
 153                                 echo "the Github API, please review the state manually at " >&2
 154                                 echo "https://github.com/$REPO/pull/$PRID"                  >&2
 155                                 exit 6
 156                         fi
 157                 fi
 158
 159                 echo -e "\n"
 160                 echo "The PR has been merged!"
 161                 echo -e "\n"
 162         fi
 163 fi
 164
 165 if [ "$(echo "$PR_INFO" | jq -r ".maintainer_can_modify")" == "true" ]; then
 166         echo "Deleting branch $LOCAL_PR_BRANCH"
 167         $GIT branch -D $LOCAL_PR_BRANCH
 168 fi
 169
 170 exit 0