test/util_lorax: add basic checks

Add checks for the lorax utility methods, like rendering a template
and executing the basic set of commands.

test/mod/test_util_lorax.py

@@ -0,0 +1,104 @@
+#
+# Basic checks for the lorax utility
+#
+
+import os
+import tempfile
+import subprocess
+
+import osbuild.util.lorax as lorax
+
+from .. import test
+
+
+BASIC_TEMPLATE = """
+# This is a comment
+<%page args="tree, name"/>
+mkdir dir-{a,b,c}
+append test/check success
+append a.txt "This is a text"
+move a.txt dir-a
+install /hello.txt dir-b
+symlink dir-b/hello.txt hello-world.txt
+runcmd touch ${tree}/foo.txt
+append a.txt "@NAME@"
+append b.txt "@NAME@"
+replace @NAME@ ${name} *.txt
+"""
+
+
+class TestUtilLorax(test.TestBase):
+
+    def assertExists(self, root, *paths):
+        for path in paths:
+            target = os.path.join(root, path.lstrip("/"))
+            if not os.path.exists(target):
+                self.fail(f"Path {target} does not exists")
+
+
+    def test_script(self):
+        with tempfile.TemporaryDirectory(dir="/var/tmp") as tmp:
+            root = os.path.join(tmp, "root")
+            tree = os.path.join(tmp, "tree")
+            os.makedirs(root)
+            os.makedirs(tree)
+
+            with open(os.path.join(root, "hello.txt"), "w") as f:
+                f.write("Hello World\n")
+
+            self.assertExists(root, "hello.txt")
+
+            template = os.path.join(tmp, "template.tmpl")
+            with open(os.path.join(tmp, template), "w") as f:
+                f.write(BASIC_TEMPLATE)
+
+            # parse the template and render it
+            args = {
+                "tree": tree,
+                "name": "osbuild-42"
+            }
+
+            tmpl = lorax.render_template(template, args)
+            self.assertIsNotNone(tmpl)
+
+            # run the script
+            script = lorax.Script(tmpl, root, tree)
+            script()
+
+            # for debugging purposes
+
+            subprocess.run(["ls", "-la", tree], check=True)
+            # check the outcome
+            self.assertExists(tree, "dir-a", "dir-b", "dir-c")
+            self.assertExists(tree, "test/check")
+            self.assertExists(tree, "dir-a/a.txt")
+            self.assertExists(tree, "dir-b/hello.txt")
+            self.assertExists(tree, "hello-world.txt")
+            self.assertExists(tree, "foo.txt")
+
+            for fn in ["a.txt", "b.txt"]:
+                with open(os.path.join(tree, fn), "r") as f:
+                    data = f.read().strip()
+                    self.assertEqual(data, "osbuild-42")
+
+
+    def test_script_errors(self):
+        with tempfile.TemporaryDirectory(dir="/var/tmp") as tmp:
+            root = os.path.join(tmp, "root")
+            tree = os.path.join(tmp, "tree")
+            os.makedirs(root)
+            os.makedirs(tree)
+
+            # file not found during `replace`
+            tmpl = [["replace", "a", "b", "nonexist-file"]]
+            script = lorax.Script(tmpl, root, tree)
+
+            with self.assertRaises(AssertionError):
+                script()
+
+            # file not found during `install`
+            tmpl = [["install", "nonexist-file", "foo"]]
+            script = lorax.Script(tmpl, root, tree)
+
+            with self.assertRaises(IOError):
+                script()