Move OUTPUT definition to oks-lib.sh & use it in start-session.

We `export` the `OUTPUT` variable to keep shellcheck happy: SC2034.

Author: flihp

script/oks-lib.sh

@@ -2,6 +2,7 @@
 # functions common to oks scripts
 
 CD_DEV=/dev/cdrom
+export OUTPUT=/var/lib/oks
 
 error() {
     >&2 command echo ["$(date --utc +%FT%TZ)" ERROR "${0##*/}"] "$@"

script/start-session

@@ -5,7 +5,7 @@ set -eou pipefail
 . oks-lib.sh
 
 info "Creating output directory."
-mkdir -p output
+mkdir -p "$OUTPUT"
 
 info "Starting terminal session recording."
-script --t=output/script-timing.log -a output/script.log
+script --t="$OUTPUT"/script-timing.log -a "$OUTPUT"/script.log

script/write-output

@@ -12,8 +12,6 @@ set -euo pipefail
 command_on_path mkisofs
 command_on_path cdrecord
 
-OUTPUT="/var/lib/oks"
-
 TMP_DIR=$(mktemp --directory)
 trap 'rm -rf -- "$TMP_DIR"' EXIT