Make depth of 1 to be the default

Based on concourse#50 (comment)

Signed-off-by: Sean M. Collins <[email protected]>

assets/in

@@ -39,7 +39,7 @@ uri=$(jq -r '.source.uri // ""' < $payload)
 branch=$(jq -r '.source.branch // ""' < $payload)
 pool_name=$(jq -r '.source.pool // ""' < $payload)
 ref=$(jq -r '.version.ref // "HEAD"' < $payload)
-depth=$(jq -r '(.params.depth // 0)' < $payload)
+depth=$(jq -r '(.params.depth // 1)' < $payload)
 
 if [ -z "$uri" ]; then
   config_errors="${config_errors}invalid payload (missing uri)\n"
@@ -63,8 +63,8 @@ if [ -n "$branch" ]; then
   branchflag="--branch $branch"
 fi
 
-depthflag=""
-if test "$depth" -gt 0 2> /dev/null; then
+depthflag="--depth 1"
+if test "$depth" -ne 1 2> /dev/null; then
   depthflag="--depth $depth"
 fi