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#! /bin/sh
set -euf
bs="# begin krebs magic <$2>"
es="# end krebs magic <$2>"
has() {
grep -q "^$bs$" $3 && grep -q "^$es$" $3
}
create() {
destroy "$@"
cat>>$3<<EOF
$bs
`cat`
$es
EOF
}
retrieve() {
sed -n "/^$bs$/,/^$es$/p" $3 | sed '1d;$d'
}
update() {
! has "$@" || create "$@"
}
destroy() {
if has "$@"; then
cache="`cat $3`"
echo "$cache" | sed "/^$bs$/,/^$es$/d" >$3
fi
}
help() {
cat <<EOF
Usage: $0 FUNCTION DELIMITER_NAME FILE
$0 creates,updates or destroys magic inside a file.
It can be used to reliably add or remove custom lines.
For example add own lines in /etc/rc.local to auto-load
scripts.
FUNCTION:
create -- creates new magic in file, takes stdin as content in magic
update -- updates already existing magic with text from stdin
destroy -- destroys magic boundary
retrieve -- retrieve the content of magic and writes to stdout
Not yet implemented is the handling of magic not starting with the
shell comment symbol "#".
EOF
}
case $1 in
(create) create "$@" ;;
(retrieve) retrieve "$@" ;;
(update) update "$@" ;;
(destroy) destroy "$@" ;;
(*)
help >&2
echo 'Error 1: You are made of stupid!' >&2
exit 23
esac
|
