cdist/cdist/conf/type/__key_value/gencode-remote

#!/bin/sh
#
# 2011 Steven Armstrong (steven-cdist at armstrong.cc)
# 2012 Nico Schottelius (nico-cdist at schottelius.org)
# 2014 Daniel Heule     (hda at sfs.biz)
#
# This file is part of cdist.
#
# cdist is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# cdist is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with cdist. If not, see <http://www.gnu.org/licenses/>.
#
#set -x


state_should="$(cat "$__object/parameter/state")"
state_is="$(cat "$__object/explorer/state")"

if [  "$state_is" = "$state_should" ]; then
    exit 0
fi

file="$(cat "$__object/parameter/file")"
key="$__object_id"
[ -f "$__object/parameter/key" ] && key="$(cat "$__object/parameter/key")"
if [ -f "$__object/parameter/exact_delimiter" ]; then
    export exact_delimiter=1
else
    export exact_delimiter=0
fi

# here we check only if the states are valid,
# emmit messages and 
# let awk do the work ...
case "$state_should" in
    absent)
        case "$state_is" in
            absent|nosuchfile)
                # nothing to do
            ;;
            wrongformat|wrongvalue|present)
                echo removed >> "$__messages_out"
            ;;
            *)
                echo "Unknown explorer state: $state_is" >&2
                exit 1
            ;;
        esac
    ;;
    present)
        case "$state_is" in
            nosuchfile)
                echo created >> "$__messages_out"
            ;;
            absent)
                echo inserted >> "$__messages_out"
            ;;
            wrongformated|wrongvalue)
                echo changed >> "$__messages_out"
            ;;
            present)
                # nothing to do
            ;;
            *)
                echo "Unknown explorer state: $state_is" >&2
                exit 1
            ;;
        esac
    ;;
    *)
       echo "Unknown state: $state_should" >&2
       exit 1
    ;;
esac

cat <<__CDIST_HEREDOC_END_HERE_MARKER
IFS='\n' read -r state <<'__CDIST_INPUT_END_HERE_MARKER'
$state_should
__CDIST_INPUT_END_HERE_MARKER
export state
IFS='\n' read -r key <<'__CDIST_INPUT_END_HERE_MARKER'
$key
__CDIST_INPUT_END_HERE_MARKER
export key
IFS='\n' read -r value <<'__CDIST_INPUT_END_HERE_MARKER'
$(cat "$__object/parameter/value")
__CDIST_INPUT_END_HERE_MARKER
export value
IFS='\n' read -r delimiter <<'__CDIST_INPUT_END_HERE_MARKER'
$(cat "$__object/parameter/delimiter")
__CDIST_INPUT_END_HERE_MARKER
export delimiter
IFS='\n' read -r comment <<'__CDIST_INPUT_END_HERE_MARKER'
$(cat "$__object/parameter/comment")
__CDIST_INPUT_END_HERE_MARKER
export comment
export exact_delimiter="$exact_delimiter"

tmpfile=\$(mktemp "${file}.cdist.XXXXXXXXXX")
# preserve ownership and permissions by copying existing file over tmpfile
if [ -f "$file" ]; then
    cp -p "$file" "\$tmpfile"
else
    touch "$file"
fi
awk -f - "$file" >"\$tmpfile" <<"AWK_EOF"
BEGIN {
    # import variables in a secure way ..
    state=ENVIRON["state"]
    key=ENVIRON["key"]
    delimiter=ENVIRON["delimiter"]
    value=ENVIRON["value"]
    comment=ENVIRON["comment"]
    exact_delimiter=ENVIRON["exact_delimiter"]
    inserted=0
    ll=""
    llpopulated=0
    line=key delimiter value
}
# enter the main loop
{
    # I dont use regex, this is by design, so we can match against every value without special meanings of chars ...
    i = index(\$0,key)
    if(i == 1) {
        delval = substr(\$0,length(key)+1)
        delpos = index(delval,delimiter)
        if(delpos > 1) {
            spaces = substr(delval,1,delpos-1)
            sub(/[ \t]*/,"",spaces)
            if( length(spaces) > 0 ) {
                # if there are not only spaces between key and delimiter,
                # continue since we we are on the wrong line
                if(llpopulated == 1) {
                    print ll
                }
                ll=\$0
                llpopulated=1
                next
            }
        }
        if(state == "absent") {
            if(ll == comment) {
                # if comment is present, clear llpopulated flag
                llpopulated=0
            }
            # if absent, simple yump over this line
            next
        }
        else {
            # if comment is present and not present in last line
            if (llpopulated == 1) {
                print ll
                if( comment != "" && ll != comment) {
                    print comment
                }
                llpopulated=0
            }
            inserted=1
            # state is present, so insert correct line here
            print line
            ll=line
            next
        }
    }
    else {
        if(llpopulated == 1) {
            print ll
        }
        ll=\$0
        llpopulated=1
    }
}
END {
    if(llpopulated == 1) {
        print ll
    }
    if(inserted == 0 && state == "present" ) {
        if(comment != "" && ll != comment){
            print comment
        }
        print line
    }
}
AWK_EOF
mv -f "\$tmpfile" "$file"
__CDIST_HEREDOC_END_HERE_MARKER