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withenv (939B)

      1 #!/bin/sh
      2 set -e
      3 
      4 ENVFILE="-"
      5 TAC="tac"
      6 which tac >/dev/null 2>&1 && TAC="tac" || TAC="tail -r"
      7 
      8 while :; do
      9     case $1 in
     10         -e|--export) EXPORT=1; shift ;;
     11         -i|--ignore) IGNORE=1; shift ;;
     12         -f|--file)   ENVFILE="$2"; shift 2 ;;
     13         --) break ;;
     14         -*) echo "Invalid option $1"; exit 1 ;;
     15         *) break ;;
     16     esac
     17 done
     18 
     19 subst() {
     20     cat "$1" \
     21       | { tee /dev/fd/3 \
     22         | sha1sum \
     23         | awk '{print "SHA1SUM=" $1}'; \
     24         } 3>&1 \
     25       | $TAC \
     26       | xargs sh -c 'printf "%s\n" "${@}" | '"$TAC"' | env "$0" envsubst' --
     27 }
     28 
     29 if [ "$IGNORE" = 1 ]; then
     30     ENVARGS="-i"
     31 fi
     32 
     33 if [ "$EXPORT" = 1 ]; then
     34     subst "$ENVFILE" | sed 's/^\([^=]*\)=\(.*\)$/export \1="\2"/'
     35     exit 0
     36 fi
     37 
     38 fifo="$(mktemp -d)/fifo"
     39 mkfifo "$fifo"
     40 (
     41     subst "$ENVFILE" | tr '\n' '\0'
     42     [ "$#" -gt 0 ] && printf "%s\0" "$@"
     43     rm -rf "$(dirname "$fifo")"
     44 ) >> "$fifo" &
     45 
     46 exec xargs -0 -a "$fifo" env $ENVARGS