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Replace marked variables with environment variables (in-place version)
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#!/bin/bash | |
################################################################################ | |
# | |
# Replace marked variables with environment variables (in-place version). | |
# Author: lleaff | |
# Version: 1.0 | |
# | |
################################################################################ | |
# Stop on error | |
set -e | |
helpfn() { | |
echo -e "USAGE: $(basename $0) FILE... [OPTION]..." >&2 | |
echo -e "Replace environment variables in file(s)." >&2 | |
echo -e "" >&2 | |
echo -e "OPTIONS:" >&2 | |
echo -e " -d, --no-modify Don't modify file in place, output result to stdout." >&2 | |
echo -e " -e, --env Source environment variables from specified env file." >&2 | |
echo -e " -o, --opening Specify hole opening character sequence (default: #{{env: )." >&2 | |
echo -e " -c, --closing Specify hole closing character sequence (default: }} )." >&2 | |
echo -e " -h, --help Show this message." >&2 | |
} | |
CRESET="\e[0m" | |
CRED="\e[31m" | |
CLYELLOW="\e[93m" | |
CGREEN="\e[32m" | |
CBLUE="\e[34m" | |
echo -ne "${CRED}" | |
OPTS=`getopt -o ho:c:de: --long help,opening:,closing:,debug,no-modify,env -n 'parse-options' -- "$@"` | |
echo -ne "${CRESET}" | |
if [ $? != 0 ]; then | |
echo -e "${CRED}[ERROR] Failed parsing options.${CRESET}" >&2 | |
helpfn | |
exit 1 | |
fi | |
eval set -- "$OPTS" | |
OPENING='#{{env:' | |
CLOSING='}}' | |
HELP=false | |
NO_MODIFY=false | |
ENV_FILE='' | |
DEBUG=false | |
while true; do | |
case "$1" in | |
-h | --help ) HELP=true; break ;; | |
-o | --opening ) OPENING="$2"; shift 2 ;; | |
-c | --closing ) CLOSING="$2"; shift 2 ;; | |
-d | --no-modify ) NO_MODIFY=true; shift ;; | |
-e | --env ) ENV_FILE="$2"; shift 2 ;; | |
--debug ) DEBUG=true; shift ;; | |
-- ) shift; break ;; | |
* ) break ;; | |
esac | |
done | |
if $HELP; then | |
helpfn | |
exit 0 | |
fi | |
if [[ $# -lt 1 ]]; then | |
echo -ne "${CRED}" >&2 | |
helpfn | |
echo -ne "${CRESET}" >&2 | |
exit 1 | |
fi | |
#============================================================ | |
if $DEBUG; then set -x; fi | |
if [[ -n "$ENV_FILE" ]]; then | |
set -o allexport | |
source "$ENV_FILE" | |
set +o allexport | |
fi | |
substenv_rep() { | |
FILE="$1" | |
# Find referenced variables | |
vars=$(grep -oe "${OPENING}\([A-Za-z0-9_]*\)${CLOSING}" "$FILE" | \ | |
sort -u | \ | |
sed "s/${OPENING}\([A-Za-z0-9_]*\)${CLOSING}/\1/") | |
echo -e "${CBLUE}$(echo $vars | wc -w) variables found: $(echo $vars).${CRESET}" >&2 | |
tmpfile="$(dirname $FILE)/.$(basename $FILE).substenv-ng~" | |
cp "$FILE" "$tmpfile" | |
for var in $vars; do | |
value=$(printenv $var | sed 's/\//\\\//g') | |
if [[ -z $value ]]; then | |
echo -e "${CLYELLOW}[WARNING] Empty environment variable \"${var}\".${CRESET}" >&2 | |
fi | |
sed -i "s/${OPENING}${var}${CLOSING}/${value}/g" "$tmpfile" | |
done | |
cat "$tmpfile" | |
rm "$tmpfile" | |
} | |
while [[ $# -ge 1 ]]; do | |
FILE="$1" | |
orig="$(dirname $FILE)/.$(basename $FILE).orig" | |
if [[ ! -f "$orig" ]]; then | |
if [[ ! -f "$FILE" ]]; then | |
echo -e "${CRED}[ERROR] No file found: \"${FILE}\".${CRESET}" >&2 | |
exit 1 | |
fi | |
cp "$FILE" "$orig" | |
else | |
echo -e "${CBLUE}Starting from \"$orig\".${CRESET}" >&2 | |
fi | |
if $NO_MODIFY; then | |
substenv_rep "$orig" $OPENING $CLOSING | |
else | |
substenv_rep "$orig" $OPENING $CLOSING > "$FILE" | |
echo -ne "${CGREEN}Replaced environment variables in \"$FILE\". " >&2 | |
echo -e "${CBLUE}Original backed up to \"$orig\".${CRESET}" >&2 | |
fi | |
shift | |
done |
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