apply: report a bit more info during an update run

this "splits" the output into sections so it's easier to attribute what
is curretly run. useful for debugging failures. in the end, the script
reports total CPU time it took to run the update.

apply.sh

@@ -2,27 +2,38 @@
 # the script executes updates to a nakamochi system.
 # it must be run as root or a user with equivalent privileges.
 
+# at script exit, report system/user CPU times it took to run
+# the whole update while preserving exit code.
+trap times EXIT
+# abort if an expansion encounteres an unset variable.
+set -u
+
 exit_code=0
 # defined in the caller script
 rootdir="$SYSUPDATES_ROOTDIR"
 
 # base os
+printf "######## base os\n" 1>&2
 cd "$rootdir"
 ./base/voidlinux.sh || exit 1
+printf "######## tor\n" 1>&2
 cd "$rootdir"
 ./base/tor.sh || exit_code=$?
 
 # nakamochi daemon and gui (ndg)
+printf "######## ndg\n" 1>&2
 cd "$rootdir"
 . ./ndg/env
 ndg_apply || exit_code=$?
 
 # bitcoin core
+printf "######## bitcoind\n" 1>&2
 cd "$rootdir"
 . ./btc/env
 bitcoin_apply || exit_code=$?
 
 # lnd lightning
+printf "######## lnd\n" 1>&2
 cd "$rootdir"
 . ./lnd/env
 lnd_apply || exit_code=$?

update.sh

@@ -30,7 +30,7 @@ fi
 # start of the sysupdate; trim prevously logged runs
 date > $LOGFILE
 
-# fetch updates from remove
+# fetch updates from remote
 cd "$REPODIR"
 {
 git fetch origin             # in case the refspec is unknown locally yet