install-unit

#!/bin/sh

set -e # Exit if any command fails

# If multiple args given run this script once for each arg
test $2 && {
  for arg in $@
    do $0 $arg
  done
  exit
}

# ---

function msg {
  local blue="\e[0;34m"
  local reset="\e[m\n"
  printf "$blue$1$reset\n"
}

unit_name=$1
unit_dir=$unit_name
test -d _units/$unit_name && unit_dir=_units/$unit_name

deps_file="$unit_dir/deps"
guard_file="$unit_dir/verify-install.sh"
install_file="$unit_dir/install.sh"

test -d $unit_dir || {
  msg "-* $unit_name not found"
  exit 1
}

# Skip if this unit or any deps are blacklisted
test -f _blacklist && {
  (grep -v '^#' _blacklist | grep -x -q "^$unit_name\$" -) && {
    msg "-* skipping blacklisted $unit_name"
    exit
  }
  test -f $deps_file && {
    for dep_name in `<$deps_file` ; do
      (grep -v '^#' _blacklist | grep -x -q $dep_name -) && {
        msg "-* skipping $unit_name due to blacklisted dep $dep_name"
        exit
      }
    done
  }
}

# Exit if there's a guard file and the guard detects an install
test -f $guard_file && sh $guard_file && [ $? -eq 0 ] && {
  msg "-* $unit_name already installed"
  exit
}

# Otherwise install deps (if the deps file contains some)
test -s $deps_file && $0 `cat $deps_file`

# Then install unit
msg "-* installing $unit_name"
sh $install_file

# Exit error if the guard still doesn't pass after install
test -f $guard_file && (sh $guard_file || {
  msg "-* $unit_name install script finished but verify-install test failed"
  exit 1
})

msg "-* $unit_name installed"