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#!/usr/bin/env bash
help() {
cat <<EOF
Simple monorepo lifecycle/pipeline tool for running one or more commands on one
or more directories that have diffs compared to an ansector. The primary
use case is for selective CI jobs within a trunk based workflow.
Takes two arguments, <glob> <command>. The command is invoked from each
directory context matching the glob.
Usage:
lolaus "./tests/* :(top,exclude)**requirements.txt" ls
lolaus "**" pwd
lolaus "*/*/package.json" npm test & lolaus "*/*/requirements.txt" "python test.py"
lolaus "apps/*/index.js"
lolaus "**" ls target-branch other-branch
EOF
exit 1
}
# lolaus <cmd> [glob] [target_ref] [source_ref]
function main() {
[[ $1 == "-h" || $1 == "--help" ]] && help
local GLOB
GLOB=${1:-'**'}
local CMD
CMD="$2"
local TARGET_REF
TARGET_REF=$(get-target-ref "$3")
[[ ${DEBUG} =~ ^(true|TRUE) ]] && echo target: $TARGET_REF
local SOURCE_REF
SOURCE_REF=$(get-source-ref "$4")
[[ ${DEBUG} =~ ^(true|TRUE) ]] && echo source: $SOURCE_REF
local CONCESTOR
CONCESTOR=$(get-concestor $TARGET_REF $SOURCE_REF)
[[ ${DEBUG} =~ ^(true|TRUE) ]] && echo concestor: $CONCESTOR
local DIFFS
DIFFS=$(get-diffs $CONCESTOR $SOURCE_REF)
[[ ${DEBUG} =~ ^(true|TRUE) ]] && echo diffs: $DIFFS
local DIRS
DIRS=$(files-to-dirs "$DIFFS")
[[ ${DEBUG} =~ ^(true|TRUE) ]] && echo dirs: $DIRS
[[ x"$2" == "x" ]] && echo "$DIRS" || cmd-runner "$CMD" "$DIRS"
}
# Invokes the provided command in each provided direcotry
# cmd-runner <cmd> <dirs>
cmd-runner() {
: ${1? "Please provide comands to run."}
: ${2? "Please provide directories to run in."}
local cmd
cmd="$1"
declare -a local dirs
dirs=($2)
for d in "${dirs[@]}"; do
[[ ! -d $d ]] && echo "cmd-runner only works on dirs, not: $d" && exit 1
local cmds="cd $d; $cmd"
output="$(eval "$cmds" 2>&1)"
[[ x"$output" == "x" ]] && output="$cmd produced no output"
[[ $d == "$PWD" ]] && d='./'
relative=${d/$(echo "$PWD/")/}
echo -e "$(tput smso) $relative $(tput sgr0)\n$output\n"
done
}
# Returns list of sorted and unique containing directories from a list of files.
# files-to-dirs <files>
files-to-dirs() {
declare -a local files
files=($1)
local path
path=$(pwd)
declare -a local dirs
declare -a local sorted
for file in "${files[@]}"; do
if [ -n "${file##*/*}" ]; then
dirs+=("$path")
else
dirs+=("$path/${file%/*}")
fi
done
IFS=$'\n' sorted=($(sort -u <<<"${dirs[*]}"))
unset IFS
echo "${sorted[*]}"
}
# Determines the closest common ansester from two git refs with a default
# strategy of 'fork-point'
# get-concestor <LEFT_REF> <RIGHT_REF> [STRATEGY]
get-concestor() {
local left_ref=${1}
local right_ref=${2}
local strategy=${3:-'fp'}
local concestor
case ${strategy} in
fp) concestor=$(git merge-base --fork-point $left_ref $right_ref) ;;
esac
echo $concestor
}
# Returns a list of files with diffs between two git refs with optional glob.
# get-diffs <left_ref> <right_ref> [glob]
get-diffs() {
local left_ref=$1
local right_ref=$2
local glob=${3:-"**"}
local diffs
diffs=$(git diff --name-only $left_ref..$right_ref -- $glob)
echo $diffs
}
# Returns the verified git reference to target. Defaults to current ref.
# get-source-ref [branch name]
get-source-ref() {
local ref=$1
if [ ! -z "$ref" ]; then
if ! git rev-parse --quiet --verify $ref &>/dev/null; then
echo "Source git ref, $ref, is not valid"
exit 1
fi
else
ref=$(git symbolic-ref --short HEAD)
fi
echo $ref
}
# Returns the verified git reference to target. Default to 'next' then 'master'
# get-target-ref [branch name]
get-target-ref() {
local REF=$1
if [ ! -z "$ref" ]; then
if ! git rev-parse --quiet --verify $ref &>/dev/null; then
echo "Targeted git ref, $ref, is not valid"
return 1
fi
else
if git rev-parse --quiet --verify next &>/dev/null; then
ref='next'
elif git rev-parse --quiet --verify master &>/dev/null; then
ref='master'
else
return 1
fi
fi
echo $ref
}
main "$@"
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