1 files changed, 236 insertions, 0 deletions
diff --git a/scripts/git/git-merge-forward.sh b/scripts/git/git-merge-forward.sh
new file mode 100755
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+++ b/scripts/git/git-merge-forward.sh
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+#!/bin/bash
+
+##############################
+# Configuration (change me!) #
+##############################
+
+# The general setup that is suggested here is:
+#
+#   GIT_PATH = /home/<user>/git/
+#     ... where the git repository directories resides.
+#   TOR_MASTER_NAME = "tor"
+#     ... which means that tor.git was cloned in /home/<user>/git/tor
+#   TOR_WKT_NAME = "tor-wkt"
+#     ... which means that the tor worktrees are in /home/<user>/git/tor-wkt
+
+# Where are all those git repositories?
+GIT_PATH="FULL_PATH_TO_GIT_REPOSITORY_DIRECTORY"
+# The tor master git repository directory from which all the worktree have
+# been created.
+TOR_MASTER_NAME="tor"
+# The worktrees location (directory).
+TOR_WKT_NAME="tor-wkt"
+
+#########################
+# End of configuration. #
+#########################
+
+# Configuration of the branches that needs merging. The values are in order:
+#   (1) Branch name that we merge onto.
+#   (2) Branch name to merge from. In other words, this is merge into (1)
+#   (3) Full path of the git worktree.
+#
+# As an example:
+#   $ cd <PATH/TO/WORKTREE> (3)
+#   $ git checkout maint-0.3.5 (1)
+#   $ git pull
+#   $ git merge maint-0.3.4 (2)
+#
+# First set of arrays are the maint-* branch and then the release-* branch.
+# New arrays need to be in the WORKTREE= array else they aren't considered.
+MAINT_034=( "maint-0.3.4" "maint-0.2.9" "$GIT_PATH/$TOR_WKT_NAME/maint-0.3.4" )
+MAINT_035=( "maint-0.3.5" "maint-0.3.4" "$GIT_PATH/$TOR_WKT_NAME/maint-0.3.5" )
+MAINT_040=( "maint-0.4.0" "maint-0.3.5" "$GIT_PATH/$TOR_WKT_NAME/maint-0.4.0" )
+MAINT_MASTER=( "master" "maint-0.4.0" "$GIT_PATH/$TOR_MASTER_NAME" )
+
+RELEASE_029=( "release-0.2.9" "maint-0.2.9" "$GIT_PATH/$TOR_WKT_NAME/release-0.2.9" )
+RELEASE_034=( "release-0.3.4" "maint-0.3.4" "$GIT_PATH/$TOR_WKT_NAME/release-0.3.4" )
+RELEASE_035=( "release-0.3.5" "maint-0.3.5" "$GIT_PATH/$TOR_WKT_NAME/release-0.3.5" )
+RELEASE_040=( "release-0.4.0" "maint-0.4.0" "$GIT_PATH/$TOR_WKT_NAME/release-0.4.0" )
+
+# The master branch path has to be the main repository thus contains the
+# origin that will be used to fetch the updates. All the worktrees are created
+# from that repository.
+ORIGIN_PATH="$GIT_PATH/$TOR_MASTER_NAME"
+
+# SC2034 -- shellcheck thinks that these are unused.  We know better.
+ACTUALLY_THESE_ARE_USED=<<EOF
+${MAINT_034[0]}
+${MAINT_035[0]}
+${MAINT_040[0]}
+${MAINT_MASTER[0]}
+${RELEASE_029[0]}
+${RELEASE_034[0]}
+${RELEASE_035[0]}
+${RELEASE_040[0]}
+EOF
+
+##########################
+# Git Worktree to manage #
+##########################
+
+# List of all worktrees to work on. All defined above. Ordering is important.
+# Always the maint-* branch BEFORE then the release-*.
+WORKTREE=(
+  RELEASE_029[@]
+
+  MAINT_034[@]
+  RELEASE_034[@]
+
+  MAINT_035[@]
+  RELEASE_035[@]
+
+  MAINT_040[@]
+  RELEASE_040[@]
+
+  MAINT_MASTER[@]
+)
+COUNT=${#WORKTREE[@]}
+
+# Controlled by the -n option. The dry run option will just output the command
+# that would have been executed for each worktree.
+DRY_RUN=0
+
+# Control characters
+CNRM=$'\x1b[0;0m'   # Clear color
+
+# Bright color
+BGRN=$'\x1b[1;32m'
+BBLU=$'\x1b[1;34m'
+BRED=$'\x1b[1;31m'
+BYEL=$'\x1b[1;33m'
+IWTH=$'\x1b[3;37m'
+
+# Strings for the pretty print.
+MARKER="${BBLU}[${BGRN}+${BBLU}]${CNRM}"
+SUCCESS="${BGRN}success${CNRM}"
+FAILED="${BRED}failed${CNRM}"
+
+####################
+# Helper functions #
+####################
+
+# Validate the given returned value (error code), print success or failed. The
+# second argument is the error output in case of failure, it is printed out.
+# On failure, this function exits.
+function validate_ret
+{
+  if [ "$1" -eq 0 ]; then
+    printf "%s\\n" "$SUCCESS"
+  else
+    printf "%s\\n" "$FAILED"
+    printf "    %s" "$2"
+    exit 1
+  fi
+}
+
+# Switch to the given branch name.
+function switch_branch
+{
+  local cmd="git checkout $1"
+  printf "  %s Switching branch to %s..." "$MARKER" "$1"
+  if [ $DRY_RUN -eq 0 ]; then
+    msg=$( eval "$cmd" 2>&1 )
+    validate_ret $? "$msg"
+  else
+    printf "\\n      %s\\n" "${IWTH}$cmd${CNRM}"
+  fi
+}
+
+# Pull the given branch name.
+function pull_branch
+{
+  local cmd="git pull"
+  printf "  %s Pulling branch %s..." "$MARKER" "$1"
+  if [ $DRY_RUN -eq 0 ]; then
+    msg=$( eval "$cmd" 2>&1 )
+    validate_ret $? "$msg"
+  else
+    printf "\\n      %s\\n" "${IWTH}$cmd${CNRM}"
+  fi
+}
+
+# Merge the given branch name ($2) into the current branch ($1).
+function merge_branch
+{
+  local cmd="git merge --no-edit $1"
+  printf "  %s Merging branch %s into %s..." "$MARKER" "$1" "$2"
+  if [ $DRY_RUN -eq 0 ]; then
+    msg=$( eval "$cmd" 2>&1 )
+    validate_ret $? "$msg"
+  else
+    printf "\\n      %s\\n" "${IWTH}$cmd${CNRM}"
+  fi
+}
+
+# Pull the given branch name.
+function merge_branch_origin
+{
+  local cmd="git merge --ff-only origin/$1"
+  printf "  %s Merging branch origin/%s..." "$MARKER" "$1"
+  if [ $DRY_RUN -eq 0 ]; then
+    msg=$( eval "$cmd" 2>&1 )
+    validate_ret $? "$msg"
+  else
+    printf "\\n      %s\\n" "${IWTH}$cmd${CNRM}"
+  fi
+}
+
+# Go into the worktree repository.
+function goto_repo
+{
+  if [ ! -d "$1" ]; then
+    echo "  $1: Not found. Stopping."
+    exit 1
+  fi
+  cd "$1" || exit
+}
+
+# Fetch the origin. No arguments.
+function fetch_origin
+{
+  local cmd="git fetch origin"
+  printf "  %s Fetching origin..." "$MARKER"
+  if [ $DRY_RUN -eq 0 ]; then
+    msg=$( eval "$cmd" 2>&1 )
+    validate_ret $? "$msg"
+  else
+    printf "\\n      %s\\n" "${IWTH}$cmd${CNRM}"
+  fi
+}
+
+###############
+# Entry point #
+###############
+
+while getopts "n" opt; do
+  case "$opt" in
+    n) DRY_RUN=1
+       echo "    *** DRY DRUN MODE ***"
+       ;;
+    *)
+       ;;
+  esac
+done
+
+# First, fetch the origin.
+goto_repo "$ORIGIN_PATH"
+fetch_origin
+
+# Go over all configured worktree.
+for ((i=0; i<COUNT; i++)); do
+  current=${!WORKTREE[$i]:0:1}
+  previous=${!WORKTREE[$i]:1:1}
+  repo_path=${!WORKTREE[$i]:2:1}
+
+  printf "%s Handling branch \\n" "$MARKER" "${BYEL}$current${CNRM}"
+
+  # Go into the worktree to start merging.
+  goto_repo "$repo_path"
+  # Checkout the current branch
+  switch_branch "$current"
+  # Update the current branch with an origin merge to get the latest.
+  merge_branch_origin "$current"
+  # Merge the previous branch. Ex: merge maint-0.2.5 into maint-0.2.9.
+  merge_branch "$previous" "$current"
+done