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#!/bin/bash -e
file=
if test -e "${!#}"; then
for var in $(sed -n 's,^ *# \+\(-p\|--pwd\) \+\([a-zA-Z][a-zA-Z0-9_]*\),\2,p' "${!#}"); do
export ${var}=$(pwgen 40 1)
done
fi
while test $# -gt 0; do
case "$1" in
(-h|--help) if test -e "${!#}"; then
sed -n 's,^ *# \( *[^-]\),\1,p' "${!#}"
cat <<EOF
$0 $(sed -n 's,^ *# \+-,-,p' "${!#}" | tr '\n' ' ') ${!#}
EOF
else
cat <<EOF
$0 [OPTIONS] FILE
OPTIONS
-h, --help Show this help
-h, --help file Show usage of template file (if documented)
-v, --var name=value Set environment variable to be used in the template.
-p, --pwd name Generate a random password with the given name.
If a password is documented, then it does not
need to be specified. But automated
generation can be overwritten assigning a
value using option -v.
FILE
A template file. In the template file, you may use bash variables
and execute bash commands, e.g. you are allowed wo use the \$()
expression.
Document the template and the parameters that in comment
lines. Comment lines that start with a hash and a space ("# "). If
a dash ("-") follows, then this line documents a parameter.
Example:
# this is an arbitrary documentation line that is copied
# these are the parameters:
#
# -v VAR1=
# -v VAR2=
# -p PWD1
# -p PWD2
DESCRIPTION
Parse a template file and generate an instance for it, using the
environment variables nd the given parameters. The use of
environment variables and command line option --var is equivalent.
EXAMPLE
file wordpress.tpl
-----------------------------------------------------------------------------
# this templeate starts a wordpress given an name and a port
# -v NAME=
# -v PORT=
# -p PASSWORD
version: '3.3'
services:
mysql:
image: mysql
volumes:
- type: bind
source: /var/volumes/\${NAME}/mysql
target: /var/lib/mysql
environment:
- 'MYSQL_DATABASE=wordpress'
- 'MYSQL_USER=wordpress'
- 'MYSQL_PASSWORD=\${PASSWORD}'
- 'MYSQL_ROOT_PASSWORD=\$(pwgen 40 1)'
deploy:
placement:
constraints:
- node.labels.location == ug
wordpress:
image: wordpress
ports:
- \${PORT}:80
volumes:
- type: bind
source: /var/volumes/\${NAME}/wordpress
target: /var/www/html
environment:
- 'WORDPRESS_DB_HOST=mysql'
- 'WORDPRESS_DB_NAME=wordpress'
- 'WORDPRESS_DB_USER=wordpress'
- 'WORDPRESS_DB_PASSWORD=\${PASSWORD}'
deploy:
placement:
constraints:
- node.labels.location == ug
-----------------------------------------------------------------------------
create instance from template:
$0 -v NAME=my-site -v PORT=8006 -p PASSWORD wordpress.tpl > my-site.yaml
EOF
fi
exit;;
(-v|--var) shift;
if [[ $1 =~ ^[a-zA-Z][a-zA-Z0-9_]*= ]]; then
export $1
else
echo "ERROR not a variable assignment: $1" 1>&2
echo " see: $0 --help" 1>&2
exit 1
fi;;
(-p|--pwd) shift;
if [[ $1 =~ ^[a-zA-Z][a-zA-Z0-9_]*$ ]]; then
export $1=$(pwgen 40 1)
else
echo "ERROR not a variable name: $1" 1>&2
echo " see: $0 --help" 1>&2
exit 1
fi;;
(*) if test $# -ne 1 -o ! -e "$1"; then
echo "ERROR please specify exactly one template file" 1>&2
echo " this not one template file: $*" 1>&2
echo " see: $0 --help" 1>&2
7 years ago
exit 1
fi
file="$1";
esac
if test $# -lt 1; then
echo "ERROR too few arguments" 1>&2
echo " see: $0 --help" 1>&2
exit 1
fi
shift
done
if ! test -e "$file"; then
echo "ERROR please specify a template file" 1>&2
echo " see: $0 --help" 1>&2
exit 1
fi
eval "sed '/^ *#/d' <<EOFXXXX
$(<$file)
EOFXXXX"