copy log to USB drive

README.md

@@ -25,13 +25,16 @@ rebooting. **Do not** install it while your TV is rooted.
 If the script fails, you must delete `autoroot.once` from the USB drive before
 it will run again.
 
+A log file named `autoroot.log` should be created on the USB drive.
+
 ## Support
 
 You can find more information at [webosbrew.org](https://www.webosbrew.org/).
 
 If you need help rooting your TV, try the
 [OpenLGTV Discord](https://discord.gg/hXMHAgJC5R). Before you ask a question,
-check the FAQ (#faq) to see if it is answered there!
+check the FAQ (#faq) to see if it is answered there! Attach your `autoroot.log`
+when asking for help.
 
 ## Credits
 

autoroot.sh

@@ -75,10 +75,13 @@ if ! tempdir="$(mktemp -d -- '/tmp/autoroot.XXXXXX')"; then
 fi
 
 logfile="${tempdir}/log"
+touch -- "${logfile}"
 
-loglink='/tmp/autoroot.log'
-rm -rf -- "${loglink}"
-ln -s -- "${logfile}" "${loglink}"
+if [ -n "${DEBUG}" ]; then
+    loglink='/tmp/autoroot.log'
+    rm -rf -- "${loglink}"
+    ln -s -- "${logfile}" "${loglink}"
+fi
 
 log 'hi'
 
@@ -93,6 +96,8 @@ oncefile="${USB_PATH}/autoroot.once"
 
 touch -- "${oncefile}"
 
+trap -- "cp -f -- '${logfile}' '${USB_PATH}/autoroot.log'" EXIT
+
 webos_ver="$(get_sdkversion)"
 
 log "webOS version: ${webos_ver}"