Restructuring of goal/start scripts

levels/02-tree/goal

@@ -1,4 +1,3 @@
-echo 'meow' > noises
 git update-index --add noises
 git write-tree
 

levels/03-commit/goal

@@ -1,7 +1 @@
-touch empty_file
-git add .
-git write-tree
 git commit-tree 3185 -m 'Clever commit message'
-
-rm empty_file
-git update-index --remove empty_file

levels/04-parents/goal

@@ -1,4 +1,3 @@
-git write-tree
 FIRST_COMMIT=$(git commit-tree 4b82 -m 'First commit :O')
 SECOND_COMMIT=$(git commit-tree 4b82 -p $FIRST_COMMIT -m 'Second commit :D')
 THIRD_COMMIT=$(git commit-tree 4b82 -p $SECOND_COMMIT -m 'Third commit \o/')

levels/05-ref/goal

@@ -1,10 +1,3 @@
-echo hello > hello
-echo world > world
-BLOB1=$(git hash-object -w hello)
-BLOB2=$(git hash-object -w world)
-git add .
-TREE=$(git write-tree)
-COMMIT=$(git commit-tree $TREE -m "Initial commit")
 git update-ref refs/a $BLOB1
 git update-ref refs/b $BLOB2
 git update-ref refs/c $TREE

levels/05-ref/start

@@ -1,5 +1,7 @@
 echo hello > hello
 echo world > world
+BLOB1=$(git hash-object -w hello)
+BLOB2=$(git hash-object -w world)
 git add .
 TREE=$(git write-tree)
-git commit-tree $TREE -m "Initial commit"
+COMMIT=$(git commit-tree $TREE -m "Initial commit")

levels/06-symref/goal

@@ -1,5 +1 @@
-TREE=$(git write-tree)
-COMMIT=$(git commit-tree $TREE -m "Initial commit")
-git update-ref refs/best_commit $COMMIT
-git update-ref refs/worst_commit $COMMIT
 git symbolic-ref HEAD refs/best_commit