update_fleet_unit.sh

#!/bin/bash

LOCALFILE=$1

LOCALHASH=$(sha1sum $LOCALFILE | awk '{print $1}')

for REMOTEFILE in $(etcdctl ls /_coreos.com/fleet/job/ | sed 's#.*/##'); do
  if [ "$REMOTEFILE" == "$LOCALFILE" ]; then
    REMOTEHASH=$(etcdctl get /_coreos.com/fleet/job/$REMOTEFILE/object | sed -r 's#.*UnitHash":\[([0-9,]+)\].*#\1#g' | tr -d '\n' | xargs -d ',' printf "%02x")
    if [ "$REMOTEHASH" == "$LOCALHASH" ]; then
      echo "Hashes are identical, do nothing"
    else
      echo "Attempting to update unit file in etcd"
      ESCAPED_STRING=$(cat $1 | sed ":a;N;\$!ba;s#\\\#\\\\\\\#g;s#\n#\\\n#g;s#\\\"#\\\\\"#g;s#\r#\\\r#g;s#\t#\\\t#g")
      LOCALHASH_DEC=$(echo "$LOCALHASH" | sed -r 's#(.{2})#0x\1,#g' | tr -d '\n' | xargs -d ',' printf "%d," | sed 's#,$##')
      NEW_JSON="{\"Raw\":\"$ESCAPED_STRING\\n\"}"
      etcdctl set /_coreos.com/fleet/unit/$LOCALHASH "$NEW_JSON"
      NEW_OBJECT="{\"Name\":\"$LOCALFILE\",\"UnitHash\":[$LOCALHASH_DEC]}"
      etcdctl set /_coreos.com/fleet/job/$LOCALFILE/object "$NEW_OBJECT"
      etcdctl rm /_coreos.com/fleet/unit/$REMOTEHASH
    fi
    break;
  fi
done

Updates fleet unit file. Didn't test it with unit templates.