Yann Autissier
990b99f0c0
config: dotenv files are parsed, never sourced, so a value can hold a # or a $(...) without breaking or executing. The make engine included .env with make syntax, which neither allowed. compose: one call per project instead of one per sub-stack.
80 lines
2.5 KiB
Bash
80 lines
2.5 KiB
Bash
#shellcheck shell=sh
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# config: where settings come from, and in which order.
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#
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# Layers, last one wins:
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# defaults < /etc/conf.d/myos, /etc/default/myos < ~/.config/myos/config
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# < <workdir>/.env < <workdir>/.env.<env> < environment < CLI VAR=val
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# MYOS_CONF_PRIORITY=system restores the old make behaviour where the system
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# file won over the project .env.
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#
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# Files are dotenv: KEY=value, one per line, # comments, optional quotes.
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# They are parsed, never sourced: a value never runs as code.
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# myos_dotenv_parse FILE print normalized KEY=value lines
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myos_dotenv_parse() {
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[ -f "$1" ] || return 0
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sed -e 's/\r$//' -e '/^[[:space:]]*#/d' -e '/^[[:space:]]*$/d' "$1" |
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while IFS= read -r _line; do
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case $_line in *=*) ;; *) continue ;; esac
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_k=${_line%%=*}
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_v=${_line#*=}
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_k=$(printf '%s' "$_k" | tr -d '[:space:]')
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# whitespace around the = is not part of the value (make: s/[[:space:]]*=[[:space:]]*/=/)
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_v=${_v#"${_v%%[![:space:]]*}"}
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case $_k in ''|*[!A-Za-z0-9_]*) continue ;; esac
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# strip one layer of matching quotes
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case $_v in
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\"*\") _v=${_v#\"}; _v=${_v%\"} ;;
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\'*\') _v=${_v#\'}; _v=${_v%\'} ;;
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esac
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printf '%s=%s\n' "$_k" "$_v"
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done
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}
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# myos_dotenv_load FILE set the variables of FILE that are not already set
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# (an already exported variable wins, as `?=` does in make)
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myos_dotenv_load() {
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[ -f "$1" ] || return 0
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while IFS= read -r _kv; do
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_k=${_kv%%=*}
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[ -n "$(myos_var "$_k")" ] && continue
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eval "$_k=\${_kv#*=}"
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done <<EOF
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$(myos_dotenv_parse "$1")
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EOF
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}
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# myos_dotenv_has FILE KEY
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myos_dotenv_has() { myos_dotenv_parse "$1" | grep -q "^$2="; }
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# myos_conf_files the system config files, most significant first
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myos_conf_files() {
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[ -n "${MYOS_CONF:-}" ] && { printf '%s\n' "$MYOS_CONF"; return 0; }
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for _f in /etc/conf.d/myos /etc/default/myos; do
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[ -r "$_f" ] && printf '%s\n' "$_f"
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done
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return 0
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}
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# myos_env_vars FILE... the ${VAR} names referenced by the compose files
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# (make: env-vars). $$VAR is a compose escape, not a shell variable.
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myos_env_vars() {
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[ $# -gt 0 ] || return 0
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sed 's/\$\$//g' "$@" 2>/dev/null |
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grep -oE '\$\{?[A-Z0-9_]+' |
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tr -d '{}$' |
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sort -u |
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tr '\n' ' ' |
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sed 's/ $//'
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}
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# myos_env_export VAR... print VAR='value' for each variable that has a value,
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# ready to be passed to env(1)
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myos_env_export() {
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for _v in "$@"; do
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_val=$(myos_var "$_v")
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[ -n "$_val" ] && printf "%s=%s\n" "$_v" "$_val"
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done
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return 0
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}
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