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