tor/scripts/git/git-setup-dirs.sh

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#!/usr/bin/env bash
SCRIPT_NAME=`basename $0`
function usage()
{
echo "$SCRIPT_NAME [-h] [-n] [-u]"
echo
echo " arguments:"
echo " -h: show this help text"
echo " -n: dry run mode"
echo " (default: run commands)"
echo " -u: if a directory or worktree already exists, use it"
echo " (default: fail and exit on existing directories)"
echo
echo " env vars:"
echo " required:"
echo " TOR_FULL_GIT_PATH: where the git repository directories reside."
echo " You must set this env var, we recommend \$HOME/git/"
echo " (default: fail if this env var is not set;"
echo " current: $GIT_PATH)"
echo
echo " optional:"
echo " TOR_MASTER: the name of the directory containing the tor.git clone"
echo " The tor master git directory is \$GIT_PATH/\$TOR_MASTER"
echo " (default: tor; current: $TOR_MASTER_NAME)"
echo " TOR_WKT_NAME: the name of the directory containing the tor"
echo " worktrees. The tor worktrees are:"
echo " \$GIT_PATH/\$TOR_WKT_NAME/{maint-*,release-*}"
echo " (default: tor-wkt; current: $TOR_WKT_NAME)"
echo " TOR_GIT_ORIGIN_PULL: the origin remote pull URL."
echo " (current: $GIT_ORIGIN_PULL)"
echo " TOR_GIT_ORIGIN_PUSH: the origin remote push URL"
echo " (current: $GIT_ORIGIN_PUSH)"
echo " TOR_UPSTREAM_REMOTE_NAME: the default upstream remote."
echo " If \$TOR_UPSTREAM_REMOTE_NAME is not 'origin', we have a"
echo " separate upstream remote, and we don't push to origin."
echo " (default: $DEFAULT_UPSTREAM_REMOTE)"
echo " TOR_GITHUB_PULL: the tor-github remote pull URL"
echo " (current: $GITHUB_PULL)"
echo " TOR_GITHUB_PUSH: the tor-github remote push URL"
echo " (current: $GITHUB_PUSH)"
echo " we recommend that you set these env vars in your ~/.profile"
}
#################
# Configuration #
#################
# Don't change this configuration - set the env vars in your .profile
# Where are all those git repositories?
GIT_PATH=${TOR_FULL_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=${TOR_MASTER_NAME:-"tor"}
# The worktrees location (directory).
TOR_WKT_NAME=${TOR_WKT_NAME:-"tor-wkt"}
# Origin repositories
GIT_ORIGIN_PULL=${TOR_GIT_ORIGIN_PULL:-"https://git.torproject.org/tor.git"}
GIT_ORIGIN_PUSH=${TOR_GIT_ORIGIN_PUSH:-"git@git-rw.torproject.org:tor.git"}
# The upstream remote which git.torproject.org/tor.git points to.
DEFAULT_UPSTREAM_REMOTE=${TOR_UPSTREAM_REMOTE_NAME:-"upstream"}
# Copy the URLs from origin
GIT_UPSTREAM_PULL="$GIT_ORIGIN_PULL"
GIT_UPSTREAM_PUSH="$GIT_ORIGIN_PUSH"
# And avoid pushing to origin if we have an upstream
if [ "$DEFAULT_UPSTREAM_REMOTE" != "origin" ]; then
GIT_ORIGIN_PUSH="No pushes to origin, if there is an upstream"
fi
# GitHub repositories
GITHUB_PULL=${TOR_GITHUB_PULL:-"https://github.com/torproject/tor.git"}
GITHUB_PUSH=${TOR_GITHUB_PUSH:-"No pushes to GitHub"}
##########################
# Git branches to manage #
##########################
# The branches and worktrees need to be modified when there is a new branch,
# and when an old branch is no longer supported.
# Configuration of the branches that needs merging. The values are in order:
# (0) current maint/release branch name
# (1) Full path of the git worktree
#
# 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_029=( "maint-0.2.9" "$GIT_PATH/$TOR_WKT_NAME/maint-0.2.9" )
MAINT_035=( "maint-0.3.5" "$GIT_PATH/$TOR_WKT_NAME/maint-0.3.5" )
MAINT_040=( "maint-0.4.0" "$GIT_PATH/$TOR_WKT_NAME/maint-0.4.0" )
MAINT_041=( "maint-0.4.1" "$GIT_PATH/$TOR_WKT_NAME/maint-0.4.1" )
MAINT_042=( "maint-0.4.2" "$GIT_PATH/$TOR_WKT_NAME/maint-0.4.2" )
MAINT_MASTER=( "master" "$GIT_PATH/$TOR_MASTER_NAME" )
RELEASE_029=( "release-0.2.9" "$GIT_PATH/$TOR_WKT_NAME/release-0.2.9" )
RELEASE_035=( "release-0.3.5" "$GIT_PATH/$TOR_WKT_NAME/release-0.3.5" )
RELEASE_040=( "release-0.4.0" "$GIT_PATH/$TOR_WKT_NAME/release-0.4.0" )
RELEASE_041=( "release-0.4.1" "$GIT_PATH/$TOR_WKT_NAME/release-0.4.1" )
RELEASE_042=( "release-0.4.2" "$GIT_PATH/$TOR_WKT_NAME/release-0.4.2" )
# 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_029[0]}
${MAINT_035[0]}
${MAINT_040[0]}
${MAINT_041[0]}
${MAINT_042[0]}
${MAINT_MASTER[0]}
${RELEASE_029[0]}
${RELEASE_035[0]}
${RELEASE_040[0]}
${RELEASE_041[0]}
${RELEASE_042[0]}
EOF
#######################
# Argument processing #
#######################
# Controlled by the -n option. The dry run option will just output the command
# that would have been executed for each worktree.
DRY_RUN=0
# Controlled by the -s option. The use existing option checks for existing
# directories, and re-uses them, rather than creating a new directory.
USE_EXISTING=0
USE_EXISTING_HINT="Use existing: '$SCRIPT_NAME -u'."
while getopts "hnu" opt; do
case "$opt" in
h) usage
exit 0
;;
n) DRY_RUN=1
echo " *** DRY RUN MODE ***"
;;
u) USE_EXISTING=1
echo " *** USE EXISTING DIRECTORIES MODE ***"
;;
*)
echo
usage
exit 1
;;
esac
done
###########################
# Git worktrees to manage #
###########################
WORKTREE=(
MAINT_029[@]
RELEASE_029[@]
MAINT_035[@]
RELEASE_035[@]
MAINT_040[@]
RELEASE_040[@]
MAINT_041[@]
RELEASE_041[@]
MAINT_042[@]
RELEASE_042[@]
MAINT_MASTER[@]
)
COUNT=${#WORKTREE[@]}
#############
# Constants #
#############
# 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}"
SKIPPED="${BYEL}skipped${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\\n" "$2"
exit 1
fi
}
# Validate the given returned value (error code), print success, skipped, or
# failed. If $USE_EXISTING is 0, fail on error, otherwise, skip on error.
# The second argument is the error output in case of failure, it is printed
# out. On failure, this function exits.
function validate_ret_skip
{
if [ "$1" -ne 0 ]; then
if [ "$USE_EXISTING" -eq "0" ]; then
# Fail and exit with error
validate_ret "$1" "$2 $USE_EXISTING_HINT"
else
printf "%s\\n" "$SKIPPED"
printf " %s\\n" "${IWTH}$2${CNRM}"
# Tell the caller to skip the rest of the function
return 0
fi
fi
# Tell the caller to continue
return 1
}
# Create a directory, and any missing enclosing directories.
# If the directory already exists: fail if $USE_EXISTING is 0, otherwise skip.
function make_directory
{
local cmd="mkdir -p '$1'"
printf " %s Creating directory %s..." "$MARKER" "$1"
local check_cmd="[ ! -d '$1' ]"
msg=$( eval "$check_cmd" 2>&1 )
if validate_ret_skip $? "Directory already exists."; then
return
fi
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 directory or repository, even if $DRY_RUN is non-zero.
# If the directory does not exist, fail and log an error.
# Otherwise, silently succeed.
function goto_dir
{
if ! cd "$1" 1>/dev/null 2>/dev/null ; then
printf " %s Changing to directory %s..." "$MARKER" "$1"
validate_ret 1 "$1: Not found. Stopping."
fi
}
# Clone a repository into a directory.
# If the directory already exists: fail if $USE_EXISTING is 0, otherwise skip.
function clone_repo
{
local cmd="git clone '$1' '$2'"
printf " %s Cloning %s into %s..." "$MARKER" "$1" "$2"
local check_cmd="[ ! -d '$2' ]"
msg=$( eval "$check_cmd" 2>&1 )
if validate_ret_skip $? "Directory already exists."; then
# If we skip the clone, we need to do a fetch
goto_dir "$ORIGIN_PATH"
fetch_remote "origin"
return
fi
if [ $DRY_RUN -eq 0 ]; then
msg=$( eval "$cmd" 2>&1 )
validate_ret $? "$msg"
else
printf "\\n %s\\n" "${IWTH}$cmd${CNRM}"
fi
}
# Add a remote by name and URL.
# If the remote already exists: fail if $USE_EXISTING is 0, otherwise skip.
function add_remote
{
local cmd="git remote add '$1' '$2'"
printf " %s Adding remote %s at %s..." "$MARKER" "$1" "$2"
local check_cmd="git remote get-url '$1'"
msg=$( eval "$check_cmd" 2>&1 )
# We don't want a remote, so we invert the exit status
if validate_ret_skip $[ ! $? ] "Remote already exists for $1 at $msg."; then
return
fi
if [ $DRY_RUN -eq 0 ]; then
msg=$( eval "$cmd" 2>&1 )
validate_ret $? "$msg"
else
printf "\\n %s\\n" "${IWTH}$cmd${CNRM}"
fi
}
# Set a remote's push URL by name and URL.
function set_remote_push
{
local cmd="git remote set-url --push '$1' '$2'"
printf " %s Setting remote %s push URL to '%s'..." "$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
}
# Fetch a remote by name.
function fetch_remote
{
local cmd="git fetch '$1'"
printf " %s Fetching %s..." "$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
}
# Replace the fetch configs for a remote with config if they match a pattern.
function replace_fetch_config
{
local cmd="git config --replace-all remote.'$1'.fetch '$2' '$3'"
printf " %s Replacing %s fetch configs for '%s'..." \
"$MARKER" "$1" "$3"
if [ $DRY_RUN -eq 0 ]; then
msg=$( eval "$cmd" 2>&1 )
validate_ret $? "$msg"
else
printf "\\n %s\\n" "${IWTH}$cmd${CNRM}"
fi
}
# Set up the tor-github PR config, so tor-github/pr/NNNN/head points to GitHub
# PR NNNN. In some repositories, "/head" is optional.
function set_tor_github_pr_fetch_config
{
# Standard branches
replace_fetch_config tor-github \
"+refs/heads/*:refs/remotes/tor-github/*" \
"refs/heads"
# PRs
replace_fetch_config "tor-github" \
"+refs/pull/*:refs/remotes/tor-github/pr/*" \
"refs/pull.*pr"
}
# Add a new worktree for branch at path.
# If the directory already exists: fail if $USE_EXISTING is 0, otherwise skip.
function add_worktree
{
local cmd="git worktree add '$2' '$1'"
printf " %s Adding worktree for %s at %s..." "$MARKER" "$1" "$2"
local check_cmd="[ ! -d '$2' ]"
msg=$( eval "$check_cmd" 2>&1 )
if validate_ret_skip $? "Directory already exists."; then
return
fi
if [ $DRY_RUN -eq 0 ]; then
msg=$( eval "$cmd" 2>&1 )
validate_ret $? "$msg"
else
printf "\\n %s\\n" "${IWTH}$cmd${CNRM}"
fi
}
# Switch to the given branch name.
# If the branch does not exist: fail.
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
}
# Checkout a new branch with the given branch name.
# If the branch already exists: fail if $USE_EXISTING is 0, otherwise skip.
function new_branch
{
local cmd="git checkout -b '$1'"
printf " %s Creating new branch %s..." "$MARKER" "$1"
local check_cmd="git branch --list '$1'"
msg=$( eval "$check_cmd" 2>&1 )
if validate_ret_skip $? "Branch already exists."; then
return
fi
if [ $DRY_RUN -eq 0 ]; then
msg=$( eval "$cmd" 2>&1 )
validate_ret $? "$msg"
else
printf "\\n %s\\n" "${IWTH}$cmd${CNRM}"
fi
}
# Switch to an existing branch, or checkout a new branch with the given
# branch name.
function switch_or_new_branch
{
local cmd="git rev-parse --verify '$1'"
if [ $DRY_RUN -eq 0 ]; then
# Call switch_branch if there is a branch, or new_branch if there is not
msg=$( eval "$cmd" 2>&1 )
RET=$?
if [ $RET -eq 0 ]; then
# Branch: (commit id)
switch_branch "$1"
elif [ $RET -eq 128 ]; then
# Not a branch: "fatal: Needed a single revision"
new_branch "$1"
else
# Unexpected return value
validate_ret $RET "$msg"
fi
else
printf "\\n %s\\n" "${IWTH}$cmd${CNRM}, then depending on the result:"
switch_branch "$1"
new_branch "$1"
fi
}
# Set the upstream for branch to upstream.
function set_upstream
{
# Note the argument order is swapped
local cmd="git branch --set-upstream-to='$2' '$1'"
printf " %s Setting upstream for %s to %s..." "$MARKER" "$1" "$2"
if [ $DRY_RUN -eq 0 ]; then
msg=$( eval "$cmd" 2>&1 )
validate_ret $? "$msg"
else
printf "\\n %s\\n" "${IWTH}$cmd${CNRM}"
fi
}
###############
# Entry point #
###############
printf "%s Setting up the repository and remote %s\\n" "$MARKER" \
"${BYEL}origin${CNRM}"
# First, fetch the origin.
ORIGIN_PARENT=$(dirname "$ORIGIN_PATH")
make_directory "$ORIGIN_PARENT"
# This is just cd with an error check
goto_dir "$ORIGIN_PARENT"
# clone repository / origin remote
clone_repo "$GIT_ORIGIN_PULL" "$TOR_MASTER_NAME"
goto_dir "$ORIGIN_PATH"
set_remote_push "origin" "$GIT_ORIGIN_PUSH"
# upstream remote, if different to origin
if [ "$DEFAULT_UPSTREAM_REMOTE" != "origin" ]; then
printf "%s Setting up remote %s\\n" "$MARKER" \
"${BYEL}$DEFAULT_UPSTREAM_REMOTE${CNRM}"
add_remote "$DEFAULT_UPSTREAM_REMOTE" "$GIT_UPSTREAM_PULL"
set_remote_push "$DEFAULT_UPSTREAM_REMOTE" "$GIT_UPSTREAM_PUSH"
fetch_remote "$DEFAULT_UPSTREAM_REMOTE"
fi
# GitHub remote
printf "%s Setting up remote %s\\n" "$MARKER" "${BYEL}tor-github${CNRM}"
# Add remote
add_remote "tor-github" "$GITHUB_PULL"
set_remote_push "tor-github" "$GITHUB_PUSH"
# Add custom fetch for PRs
set_tor_github_pr_fetch_config
# Now fetch them all
fetch_remote "tor-github"
# Go over all configured worktree.
for ((i=0; i<COUNT; i++)); do
branch=${!WORKTREE[$i]:0:1}
repo_path=${!WORKTREE[$i]:1:1}
printf "%s Handling branch %s\\n" "$MARKER" "${BYEL}$branch${CNRM}"
# We cloned the repository, and master is the default branch
if [ "$branch" != "master" ]; then
# git makes worktree directories if they don't exist
add_worktree "origin/$branch" "$repo_path"
fi
goto_dir "$repo_path"
switch_or_new_branch "$branch"
set_upstream "$branch" "origin/$branch"
done
echo
echo "Remember to copy the git hooks from tor/git/hooks/*.git-hook to"
echo "$ORIGIN_PATH/.git/hooks/*"