Add file/directory management

tests/manual/src/f1.txt

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+Simple text file with a %variable%
+
+twice: %another_variable%

tests/manual/src/f2.sh

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+#!/usr/bin/env bash
+# This file should be executable.
+echo "Hello, world!"

tests/manual/src/srcdir/1

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+1
+1
+1

tests/manual/src/srcdir/2

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+2
+2
+2

tests/manual/src/srcdir/sub/s1

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+s1
+s1
+s1

tests/manual/src/srcdir/sub/s2

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+s2
+s2
+s2

tests/manual/test_file_creation.py

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+import os
+import shutil
+import sys
+
+# This test is manual. You'll have to verify the results manually.
+
+# NOTE: Change this if you want to run this script.
+user = "kk"
+
+cd = os.path.dirname(os.path.abspath(__file__))
+os.chdir(cd)
+
+sys.path.append(os.path.join(cd, "../../src/."))
+
+from decman import File, Directory
+
+#if os.path.exists("/tmp/decman-files"):
+#    shutil.rmtree("/tmp/decman-files")
+#os.makedirs("/tmp/decman-files")
+
+f1 = File(source_file="src/f1.txt")
+f1.copy_to(
+    "/tmp/decman-files/f1.txt",
+    variables={
+        "%variable%": "123",
+        "%another_variable%": "456"
+    },
+)
+
+f2 = File(source_file="src/f2.sh", permissions=0o744)
+f2.copy_to("/tmp/decman-files/f2.sh", )
+
+f3 = File(content="%variable% doesn't work here.", bin_file=True)
+f3.copy_to(
+    "/tmp/decman-files/f3.txt",
+    variables={
+        "%variable%": "123",
+    },
+)
+
+f4 = File(content="%variable% works here.", bin_file=False, owner=user)
+f4.copy_to(
+    "/tmp/decman-files/f4.txt",
+    variables={
+        "%variable%": "123",
+    },
+)
+
+f5 = File(content="%variable% works here.",
+          bin_file=False,
+          owner=user,
+          group="root")
+f5.copy_to(
+    "/tmp/decman-files/f5.txt",
+    variables={
+        "%variable%": "123",
+    },
+)
+
+d = Directory("src/srcdir", bin_files=True)
+d.copy_to("/tmp/decman-files/targetdir")