_functions_files.sh

#!/bin/bash -eu

# Don't load it several times
set +u
${_FUNCTIONS_FILES_LOADED:-false} && return
set -u

# if the script was started from the base directory, then the
# expansion returns a period
if test "${SCRIPT_DIR}" == "."; then
  SCRIPT_DIR="$PWD"
# if the script was not called with an absolute path, then we need to add the
# current working directory to the relative path of the script
elif test "${SCRIPT_DIR:0:1}" != "/"; then
  SCRIPT_DIR="$PWD/${SCRIPT_DIR}"
fi

# #############################################################################
# Load shared functions
# #############################################################################
source "${SCRIPT_DIR}/_functions_core.sh"

# #############################################################################
# Files related functions
# #############################################################################

#
# Replace in file $1 the value $2 by $3
#
replace_in_file() {
  mv $1 $1.orig
  ${CMD_SED} "s|$2|$3|g" $1.orig > $1
  rm $1.orig
}

#
# find_file <VAR> <PATH1> ..  <PATHx>
# test all paths and the path of the latest one existing in parameters is set as VAR
#
find_file() {
  set +u
  local _varName=$1
  shift;
  # default value set to UNSET
  env_var ${_varName} "UNSET"
  for i in $*
  do
    [ -e "$i" ] && env_var ${_varName} "$i"
  done
  set -u
}

#
# Apply Jinja2 template from $1 file
#
j2() {
  if ! which j2 &>/dev/null; then 
    local tmpfile=$(mktemp)
    env > $tmpfile
    ${DOCKER_CMD} run --env-file $tmpfile --rm -v "$2":"$2" ${DEPLOYMENT_J2CLI_IMAGE}:${DEPLOYMENT_J2CLI_VERSION} $1 $2
    rm $tmpfile
  else 
    j2 $1 $2
  fi
}

#
# Replace in file $1 all environment variables (${XXX}) and push the result in $2
#
evaluate_file_content() {
  local _file_in=$1
  local _file_out=$2
  if [ ${_file_in##*.} = "j2" ]; then 
    j2 --undefined ${_file_in} > ${_file_out}
  else 
    if which perl &>/dev/null; then 
      perl -pe 's/\$\{([^}]+)\}/$ENV{$1} || ""/ge' < ${_file_in} > ${_file_out}
    else 
      awk '{while(match($0,"[$]{[^}]*}")) {var=substr($0,RSTART+2,RLENGTH -3);gsub("[$]{"var"}",ENVIRON[var])}}1' < ${_file_in} > ${_file_out}
    fi
    # escape any single quote
    if ${LINUX}; then
      replace_in_file ${_file_out} "'" "\\\'"
    else
      replace_in_file ${_file_out} "\'" "\\\'"
    fi
  fi
}

# Backup the file passed as parameter
backup_file() {
  if [ -d $1 ]; then
    # We need to backup existing file if they already exist
    cd $1
    local _start_date=`date -u "+%Y%m%d-%H%M%S-UTC"`
    for file in $2
    do
      if [ -e ${file} ]; then
        echo_info "Archiving existing file $file as archived-on-${_start_date}-$file   ..."
        mv ${file} archived-on-${_start_date}-${file}
        echo_info "Done."
      fi
    done
    cd -
  fi
}

# #############################################################################
# Env var to not load it several times
_FUNCTIONS_FILES_LOADED=true
echo_debug "_functions_files.sh Loaded"