Make create_challenge not verbose by default

Allow for verbose output with -v

README.md

@@ -2,6 +2,9 @@
 
 This is the (WIP) script for creating an interactive `git` repo that is a completely self-contained `git` tutorial. To create a local "playable" copy run `./create_challenge.sh`. The challenge itself is only in the then created folder "challenge" and NOT in this repository. Do NOT look around in this repository unless you want to develop this challenge, because otherwise you will be spoiled with the solutions ;)
 
+## debugging
+
+By default `./create_challenge.sh` does not show the git output to avoid leaking information. If you get an error you can run it again with `-v`/`--verbose`.
 
 ## testing
 

create_challenge.sh

@@ -1,5 +1,28 @@
 #!/usr/bin/env bash
 
+while [ $# -gt 0 ]; do
+    case "$1" in
+        -v|--verbose)
+            verbose=true
+            shift
+            ;;
+        *)
+            echo "ERROR! Unknown option '$1'. Useage: $0 [-v|--verbose]" >&2
+            exit 1
+            ;;
+    esac
+done
+
+if [ "$verbose" != true ]; then
+    exec 3>&1 4>&2 >/dev/null 2>&1 # store stdin / stdout filedescriptors so that we can still print in case of an error
+fi
+on_error() {
+    exec 1>&3 2>&4 # restore file descriptors
+    printf "❌ \e[3;1;31mERROR! Run again with \`-v\` for more verbose output\e[0m\n" >&2
+    exit 1
+}
+trap on_error ERR
+
 set -e
 shopt -s extglob
 . ./lib.sh
@@ -9,7 +32,7 @@ if [ -e challenge ]; then
     rm -rf challenge2
     mv challenge challenge2
 fi
-. ./src/redeem.nuggit >/dev/null 2>&1
+. ./src/redeem.nuggit
 
 LOCAL_CODE_EXECUTION_HASH="$(success "LocalCodeExecution" | git hash-object --stdin)"
 NUMBER_OF_NUGGITS="$(wc -l <"$DOCDIR/nuggits")"

lib-test.sh

@@ -35,7 +35,7 @@ it(){
 trap 'failure $(printf "%q" "$testname")' ERR EXIT
 $code
 trap - EXIT # Remove the trap handler, so that it does not fire at the end of the script
-" >/dev/null
+"
     success "$testname"
 }
 

test.sh

@@ -5,7 +5,7 @@ set -e
 . ./lib.sh
 . ./lib-test.sh
 echo "Building..."
-./create_challenge.sh >/dev/null 2>&1
+./create_challenge.sh
 cd challenge
 reproducibility_setup
 
@@ -27,7 +27,7 @@ check_redeem_without_local_code_execution
 
 echo "Building once more..."
 cd ..
-./create_challenge.sh >/dev/null 2>&1
+./create_challenge.sh
 echo "Running tests..."
 cd challenge
 reproducibility_setup