prow-entrypoint: always prepare repos in cosa_init

PR #44 moved prepare_repos to cosa_init because 1. we want to take
advantage of the $variant variable defined in this function and not
have to define another time in cosa_build 2. it feel the right
place to fetch the repos during the cosa init operation.
But, as prepare_repos is placed after testing the existence of the
'builds' directory, the repos are not fetch when already in an
intilialized cosa dir.
This changes the behavior by always fetching the repos during the
cosa_init process.

Author: joelcapitao

ci/prow-entrypoint.sh

@@ -33,18 +33,20 @@ setup_user() {
 # Setup a new build directory with COSA init, selecting the version of RHEL or
 # CentOS Stream that we want as a basis for RHCOS/SCOS.
 cosa_init() {
-    if test -d builds; then
-        echo "Already in an initialized cosa dir"
-        return
-    fi
-
     if [[ ${#} -ne 1 ]]; then
         echo "This should have been called with a single 'variant' argument"
         exit 1
     fi
     local -r variant="${1}"
     echo "Using variant: ${variant}"
 
+    if test -d builds; then
+        echo "Already in an initialized cosa dir"
+        # Pull repos from an in-cluster service of the Openshift CI
+        prepare_repos "${variant}"
+        return
+    fi
+
     # Always create a writable copy of the source repo
     tmp_src="$(mktemp -d)"
     cp -a /src "${tmp_src}/os"