Implement addins feature

examples/demoapp/BUILD

@@ -85,7 +85,11 @@ springboot(
 
     # if you have conflicting classes in dependency jar files, you can define the order in which the jars are loaded
     #  https://docs.spring.io/spring-boot/docs/current/reference/html/appendix-executable-jar-format.html#executable-jar-war-index-files-classpath
-    deps_index_file = "demoapp_classpath.idx",
+    deps_index_file = ":demoapp_classpath.idx",
+
+    # sometimes packagers want to put certain files into the root of the springboot app jar
+    # these addins will be copied into the root of the generated springboot jar
+    addins = [":info.txt", ":author.txt"],
 )
 
 springboottest_deps = [

examples/demoapp/author.txt

@@ -0,0 +1 @@
+Salesforce

examples/demoapp/info.txt

@@ -0,0 +1,3 @@
+This springboot jar was built by Bazel rules_spring.
+
+It is copied into the toplevel directory of the springboot jar as an 'addin'.

springboot/BUILD

@@ -20,6 +20,7 @@ exports_files([
     "default_bazelrun_script.sh",
     "dupe_class_jar_allowlist.txt",
     "empty.txt",
+    "addin_end.txt",
 ])
 
 py_binary(

springboot/addin_end.txt

@@ -0,0 +1 @@
+Marker file that indicates the end of the addin list.

springboot/springboot.bzl

@@ -253,6 +253,7 @@ def springboot(
         bazelrun_jvm_flags = None,
         bazelrun_data = None,
         bazelrun_background = False,
+        addins = [],
         tags = [],
         testonly = False,
         visibility = None,
@@ -300,6 +301,7 @@ def springboot(
         to pass to the JVM at startup. Ex: *-Dcustomprop=gold -DcustomProp2=silver*
       bazelrun_data: Uncommon option to add data files to runfiles. Behaves like the *data* attribute defined for *java_binary*.
       bazelrun_background: Optional. If True, the *bazel run* launcher will not block. The run command will return and process will remain running.
+      addins: Uncommon option to add additional files to the root of the springboot jar. For example a license file. Pass an array of files from the package.
       tags: Optional. Bazel standard attribute.
       testonly: Optional. Bazel standard attribute. Defaults to False.
       visibility: Optional. Bazel standard attribute.
@@ -417,6 +419,8 @@ def springboot(
             ":" + genmanifest_rule,
             ":" + gengitinfo_rule,
             deps_index_file,
+        ] + addins + [
+            "@rules_spring//springboot:addin_end.txt",
             ":" + dep_aggregator_rule,
         ],
         cmd = "$(location @rules_spring//springboot:springboot_pkg.sh) " +

springboot/springboot_doc.md

@@ -36,6 +36,7 @@ Note that the rule README has more detailed usage instructions for each attribut
 | bazelrun_jvm_flags |  Optional. When launching the application using 'bazel run', an optional set of JVM flags   to pass to the JVM at startup. Ex: *-Dcustomprop=gold -DcustomProp2=silver*   |  <code>None</code> |
 | bazelrun_data |  Uncommon option to add data files to runfiles. Behaves like the *data* attribute defined for *java_binary*.   |  <code>None</code> |
 | bazelrun_background |  Optional. If True, the *bazel run* launcher will not block. The run command will return and process will remain running.   |  <code>False</code> |
+| addins | Uncommon option to add additional files to the root of the springboot jar. For example a license file. Pass an array of files from the package. | <code>None</code> |
 | tags |  Optional. Bazel standard attribute.   |  <code>[]</code> |
 | testonly |  Optional. Bazel standard attribute.   |  <code>False</code> |
 | visibility |  Optional. Bazel standard attribute.   |  <code>None</code> |

springboot/springboot_pkg.sh

@@ -29,7 +29,7 @@ appjar=$7
 manifest=$8
 gitpropsfile=$9
 deps_index_file=${10}
-first_jar_arg=11
+first_addin_arg=11
 
 if [ $deps_starlark_order = "True" ]; then
   deps_starlark_order=true
@@ -86,6 +86,7 @@ echo "  appjar_name     $appjar_name (unused, is the appjar filename without the
 echo "  manifest        $manifest    (the location of the generated manifest.MF file)" >> $debugfile
 echo "  deps_index_file $deps_index_file (the location of the classpath index file - optional)" >> $debugfile
 echo "  deplibs         (list of upstream transitive dependencies, these will be incorporated into the jar file in BOOT-INF/lib )" >> $debugfile
+echo "*************************************************************************************" >> $debugfile
 
 # compute path to jar utility
 pushd . > /dev/null
@@ -95,15 +96,6 @@ popd > /dev/null
 echo "Jar command:" >> $debugfile
 echo $jar_command >> $debugfile
 
-# log the list of dep jars we were given
-i=$first_jar_arg
-while [ "$i" -le "$#" ]; do
-  eval "lib=\${$i}"
-  echo "     DEPLIB:      $lib" >> $debugfile
-  i=$((i + 1))
-done
-echo "" >> $debugfile
-
 echo $shasum_install_msg >> $debugfile
 echo "Unique identifier for this build: [$packagesha] computed from [$packagesha_raw]" >> $debugfile
 
@@ -119,6 +111,33 @@ mkdir -p $working_dir/BOOT-INF/classes
 TMP_working_dir=$base_working_dir/tmp
 mkdir -p $TMP_working_dir
 
+# Addins is the feature to add files to the root of the springboot jar
+# The addins are listed in order as args, until the addin_end.txt file marks the end 
+i=$first_addin_arg
+while [ "$i" -le "$#" ]; do
+  eval "addin=\${$i}"
+  echo "     ADDINt: $addin" >> $debugfile
+  if [[ $addin == *addin_end.txt ]]; then
+    i=$((i + 1))
+    echo "     ADDIN end found: $addin" >> $debugfile
+    break
+  fi
+  echo "     ADDIN: $addin" >> $debugfile
+  cp $addin $working_dir
+  i=$((i + 1))
+done
+first_jar_arg=$i
+echo "" >> $debugfile
+
+# log the list of dep jars we were given
+i=$first_jar_arg
+while [ "$i" -le "$#" ]; do
+  eval "lib=\${$i}"
+  echo "     DEPLIB:      $lib" >> $debugfile
+  i=$((i + 1))
+done
+echo "" >> $debugfile
+
 # Extract the compiled Boot application classes into BOOT-INF/classes
 #    this must include the application's main class (annotated with @SpringBootApplication)
 cd $working_dir/BOOT-INF/classes