Added build tests for generating multiple targets (#23)

* Added build tests for generating multiple targets

These builds are useful for intensively test the platform
- One genrule creating dummy text files
- One genrule for copying pdf copies
- One genrule for copying compressed files
- One genrule for copying iso images

* Updated number of generated targets

* Removed comments and added shared variable for genrule tests

* Added one more comment and changed 2021 for 2022

Author: anfelbar

WORKSPACE

@@ -0,0 +1,15 @@
+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_file")
+
+http_file(
+    name = "emacs",
+    urls = ["https://mirror.its.dal.ca/gnu/emacs/emacs-28.1.tar.gz",
+            "https://mirrors.kernel.org/gnu/emacs/emacs-28.1.tar.gz"],
+    sha256 = "1439bf7f24e5769f35601dbf332e74dfc07634da6b1e9500af67188a92340a28"
+)
+
+http_file(
+    name = "ubuntu_20.04_1.3GB",
+    urls = ["https://mirror.math.princeton.edu/pub/ubuntu-iso/focal/ubuntu-20.04.4-live-server-amd64.iso",
+            "https://mirror.pit.teraswitch.com/ubuntu-releases/focal/ubuntu-20.04.4-live-server-amd64.iso"],
+    sha256 = "28ccdb56450e643bad03bb7bcf7507ce3d8d90e8bf09e38f6bd9ac298a98eaad"
+)

genrules/BUILD

@@ -0,0 +1,45 @@
+# Copyright 2022 EngFlow Inc. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# The following genrules are able to produce thousands of targets based
+# on the user's input. 
+# This can be used for stress testing your build infrastructure.
+# Change the upper bound of the range and enjoy! 
+UPPER_BOUND = 10
+[genrule(
+ name = "foo_TXT_4KB_" + str(x),
+ outs = ["foo_text" + str(x) + ".txt"],
+ cmd = "echo 'Hello engflow world' > $@",
+) for x in range(1,UPPER_BOUND)]
+
+[genrule(
+ name = "gnu-manifesto_PDF_76KB" + str(x),
+ outs = ["gnu-manifesto" + str(x) + ".pdf"],
+ cmd = "cp $(location gnu-manifesto.pdf) $@",
+ tools = ["gnu-manifesto.pdf"]
+) for x in range(1,UPPER_BOUND)]
+
+[genrule(
+ name = "emacs_TARGZ_68MB" + str(x),
+ outs = ["emacs" + str(x) + ".tar.gz"],
+ cmd = "cp $(location @emacs//file) $@",
+ tools = ["@emacs//file"]
+) for x in range(1,UPPER_BOUND)]
+
+[genrule(
+  name = "ubuntu_20.04_1.3GB" + str(x),
+  outs = ["ubuntu_20.04_1.3GB" + str(x) + ".iso"],
+  cmd = "cp $(location @ubuntu_20.04_1.3GB//file) $@",
+  tools = ["@ubuntu_20.04_1.3GB//file"]
+) for x in range(1,2)]