diff --git a/Dockerfile b/Dockerfile
index 911c066..56e8c9b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,7 @@
 FROM kivy/buildozer:latest
 # See https://github.com/kivy/buildozer/blob/master/Dockerfile
 
-# Buildozer will be installed in entrypoint.sh
+# Buildozer will be installed in entrypoint.py
 # This is needed to install version specified by user
 RUN pip3 uninstall -y buildozer
 
@@ -10,7 +10,5 @@ RUN pip3 uninstall -y buildozer
 # See https://github.com/sudo-project/sudo/issues/42
 RUN echo "Set disable_coredump false" | sudo tee -a /etc/sudo.conf > /dev/null
 
-COPY entrypoint.sh /action/entrypoint.sh
-COPY patches.py /action/patches.py
-
-ENTRYPOINT ["/action/entrypoint.sh"]
+COPY entrypoint.py /action/entrypoint.py
+ENTRYPOINT ["/action/entrypoint.py"]
diff --git a/README.md b/README.md
index 77d8789..2a056dc 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,14 @@ but adds some features and patches to use in GitHub Actions.
 **Required** Command to start Buildozer.
 
 - _Default:_ `buildozer android debug` _(iOS and OSX is not supported because Docker cannot run on MacOS)_.
-- For more commands use `;` as delimiter: `python3 setup.py build_ext --inplace; buildozer android debug`.
+- For more commands use `;` as delimiter: `python3 pre_buildozer.py; buildozer android debug`.
+
+### `repository_root`
+
+**Required** Path to cloned repository.
+
+- _Default:_ `.` (GitHub workspace).
+- Set to directory name if you specified path for `actions/checkout` action.
 
 ### `workdir`
 
diff --git a/action.yml b/action.yml
index 03bf92a..f494e47 100644
--- a/action.yml
+++ b/action.yml
@@ -10,6 +10,10 @@ inputs:
     description: Command to start Buildozer. Set to `buildozer ios debug` for iOS
     required: true
     default: buildozer android debug
+  repository_root:
+    description: Path to cloned repository. Set if you specified path for `actions/checkout` action.
+    required: true
+    default: .
   workdir:
     description: Working directory where buildozer.spec is located. Set to `src` if buildozer.spec is in `src` directory
     required: true
diff --git a/entrypoint.py b/entrypoint.py
new file mode 100644
index 0000000..7b83d25
--- /dev/null
+++ b/entrypoint.py
@@ -0,0 +1,142 @@
+#!/bin/python3
+"""
+Buildozer action
+================
+
+It sets some environment variables, installs Buildozer, runs Buildozer and finds
+output file.
+
+You can read this file top down because functions are ordered by their execution
+order.
+"""
+
+import os
+from os import environ as env
+import subprocess
+
+
+def main():
+    repository_root = os.path.abspath(env["INPUT_REPOSITORY_ROOT"])
+    change_owner(env["USER"], repository_root)
+    fix_home()
+    install_buildozer(env["INPUT_BUILDOZER_VERSION"])
+    apply_buildozer_settings()
+    change_directory(env["INPUT_REPOSITORY_ROOT"], env["INPUT_WORKDIR"])
+    apply_patches()
+    run_command(env["INPUT_COMMAND"])
+    set_output(env["INPUT_REPOSITORY_ROOT"], env["INPUT_WORKDIR"])
+    change_owner("root", repository_root)
+
+
+def change_owner(user, repository_root):
+    # GitHub sets root as owner of repository directory. Change it to user
+    # And return to root after all commands
+    subprocess.check_call(["sudo", "chown", "-R", user, repository_root])
+
+
+def fix_home():
+    # GitHub sets HOME to /github/home, but Buildozer is installed to /home/user. Change HOME to user's home
+    env["HOME"] = env["HOME_DIR"]
+
+
+def install_buildozer(buildozer_version):
+    # Install required Buildozer version
+    print("::group::Installing Buildozer")
+    pip_install = "pip3 install --user --upgrade".split()
+    if buildozer_version == "stable":
+        # Install stable buildozer from PyPI
+        subprocess.check_call([*pip_install, "buildozer"])
+    elif os.path.exists(buildozer_version):
+        # Install from local directory
+        subprocess.check_call([*pip_install, buildozer_version])
+    elif buildozer_version.startswith("git+"):
+        # Install from specified git+ link
+        subprocess.check_call([*pip_install, buildozer_version])
+    elif buildozer_version == "":
+        # Just do nothing
+        print(
+            "::warning::Buildozer is not installed because "
+            "specified buildozer_version is nothing."
+        )
+    else:
+        # Install specified ref from repository
+        subprocess.check_call(
+            [
+                *pip_install,
+                f"git+https://github.com/kivy/buildozer.git@{buildozer_version}",
+            ]
+        )
+    print("::endgroup::")
+
+
+def apply_buildozer_settings():
+    # Buildozer settings to disable interactions
+    env["BUILDOZER_WARN_ON_ROOT"] = "0"
+    env["APP_ANDROID_ACCEPT_SDK_LICENSE"] = "1"
+    # Do not allow to change directories
+    env["BUILDOZER_BUILD_DIR"] = "./.buildozer"
+    env["BUILDOZER_BIN"] = "./bin"
+
+
+def change_directory(repository_root, workdir):
+    directory = os.path.join(repository_root, workdir)
+    # Change directory to workir
+    if not os.path.exists(directory):
+        print("::error::Specified workdir is not exists.")
+        exit(1)
+    os.chdir(directory)
+
+
+def apply_patches():
+    # Apply patches
+    print("::group::Applying patches to Buildozer")
+    try:
+        import buildozer
+    except ImportError:
+        print(
+            "::error::Cannot apply patches to buildozer (ImportError). "
+            "Update buildozer-action to new version or create a Bug Request"
+        )
+        return
+
+    print("Changing global_buildozer_dir")
+    source = open(buildozer.__file__, "r", encoding="utf-8").read()
+    new_source = source.replace(
+        """
+        @property
+        def global_buildozer_dir(self):
+            return join(expanduser('~'), '.buildozer')
+    """,
+        f"""
+        @property
+        def global_buildozer_dir(self):
+            return '{os.environ["GITHUB_WORKSPACE"]}/.buildozer_global'
+    """,
+    )
+    if new_source == source:
+        print(
+            "::warning::Cannot change global buildozer directory. "
+            "Update buildozer-action to new version or create a Bug Request"
+        )
+    open(buildozer.__file__, "w", encoding="utf-8").write(new_source)
+    print("::endgroup::")
+
+
+def run_command(command):
+    # Run command
+    retcode = subprocess.check_call(command.split())
+    if retcode:
+        print(f'::error::Error while executing command "{command}"')
+        exit(1)
+
+
+def set_output(repository_root, workdir):
+    if not os.path.exists("bin"):
+        print("::error::Output directory does not exist. See Buildozer log for error")
+        exit(1)
+    filename = [file for file in os.listdir("bin") if os.path.isfile(os.path.join("bin", file))][0]
+    print(f"::set-output name=filename::{os.path.join(repository_root, workdir, 'bin', filename)}")
+
+
+if __name__ == "__main__":
+    main()
diff --git a/entrypoint.sh b/entrypoint.sh
deleted file mode 100755
index 23d611f..0000000
--- a/entrypoint.sh
+++ /dev/null
@@ -1,60 +0,0 @@
-#!/bin/bash
-
-# GitHub sets root as owner of repository directory. Change it to user
-sudo chown -R "$USER" "$GITHUB_WORKSPACE"
-# GitHub sets HOME to /github/home, but Buildozer is installed to /home/user. Change HOME to user's home
-export HOME=$HOME_DIR
-
-# Install required Buildozer version
-echo ::group::Installing Buildozer
-PIP_INSTALL="pip3 install --user --upgrade"
-if [[ "$INPUT_BUILDOZER_VERSION" == "stable" ]]; then
-  $PIP_INSTALL buildozer  # Install stable buildozer from PyPI
-elif [[ -d "$INPUT_BUILDOZER_VERSION" ]]; then
-  $PIP_INSTALL "$INPUT_BUILDOZER_VERSION"  # Install from local directory
-elif [[ "$INPUT_BUILDOZER_VERSION" == "git+"* ]]; then
-  $PIP_INSTALL "$INPUT_BUILDOZER_VERSION"  # Install from specified git+ link
-elif [[ "$INPUT_BUILDOZER_VERSION" == "" ]]; then
-  echo ::warning::Buildozer is not installed because specified buildozer_version is nothing.  # Just do nothing
-else
-  $PIP_INSTALL "git+https://github.com/kivy/buildozer.git@$INPUT_BUILDOZER_VERSION"  # Install specified ref from repository
-fi
-echo ::endgroup::
-
-# Buildozer settings to disable interactions
-export BUILDOZER_WARN_ON_ROOT=0
-export APP_ANDROID_ACCEPT_SDK_LICENSE=1
-# Do not allow to change directories
-export BUILDOZER_BUILD_DIR=./.buildozer
-export BUILDOZER_BIN=./bin
-
-# Change directory to workir
-if ! cd "$INPUT_WORKDIR"; then
-  echo ::error::Specified workdir is not exists.
-  exit 1
-fi
-
-# Apply patches
-echo ::group::Applying patches to Buildozer
-if ! python3 /action/patches.py; then
-  echo ::error::Error while running patches.py
-  # exit 1  # Allow to fail
-fi
-echo ::endgroup::
-
-# Run command
-if ! sh -c "$INPUT_COMMAND"; then
-  echo ::error::Error while executing command \""$INPUT_COMMAND"\"
-  exit 1
-fi
-
-# Give access to root
-sudo chown -R root "$GITHUB_WORKSPACE"
-
-# Set output
-if [ ! -d bin ]; then
-  echo ::error::Output directory does not exist. See Buildozer log for error
-  exit 1
-fi
-filename=$(ls bin | head -n1)
-echo ::set-output name=filename::"$INPUT_WORKDIR/bin/$filename"
diff --git a/patches.py b/patches.py
deleted file mode 100644
index 5a1c3b4..0000000
--- a/patches.py
+++ /dev/null
@@ -1,20 +0,0 @@
-import os
-import buildozer
-
-print("Changing global_buildozer_dir")
-source = open(buildozer.__file__, "r", encoding="utf-8").read()
-new_source = source.replace(
-    """
-    @property
-    def global_buildozer_dir(self):
-        return join(expanduser('~'), '.buildozer')
-""",
-    f"""
-    @property
-    def global_buildozer_dir(self):
-        return '{os.environ["GITHUB_WORKSPACE"]}/.buildozer_global'
-""",
-)
-if new_source == source:
-    print("::warning::Cannot change global buildozer directory. Update buildozer-action to new version or create a Bug Request")
-open(buildozer.__file__, "w", encoding="utf-8").write(new_source)