Add apk support (alpine)

nanolayer/cli/install.py

@@ -3,6 +3,7 @@
 
 import typer
 
+from nanolayer.installers.apk.apk_installer import ApkInstaller
 from nanolayer.installers.apt.apt_installer import AptInstaller
 from nanolayer.installers.apt_get.apt_get_installer import AptGetInstaller
 from nanolayer.installers.aptitude.aptitude_installer import AptitudeInstaller
@@ -121,6 +122,15 @@ def install_aptitude_packages(
     )
 
 
+@app.command("apk")
+def install_apk_packages(
+    packages: str = typer.Argument(None, help="comma separated list of apk packages")
+) -> None:
+    ApkInstaller.install(
+        packages=packages.split(","),
+    )
+
+
 @app.command("gh-release")
 def install_gh_release_binary(
     repo: str,

nanolayer/installers/apk/apk_installer.py

@@ -0,0 +1,40 @@
+import tempfile
+from typing import List
+
+from nanolayer.utils.invoker import Invoker
+from nanolayer.utils.linux_information_desk import LinuxInformationDesk
+
+
+class ApkInstaller:
+    @classmethod
+    def is_alpine(cls) -> bool:
+        return (
+            LinuxInformationDesk.get_release_id()
+            == LinuxInformationDesk.LinuxReleaseID.alpine
+        )
+
+    @classmethod
+    def delete(cls, packages: List[str]) -> None:
+        assert cls.is_alpine(), "apk should be used on alpine linux distribution"
+        Invoker.invoke(command=f"apk del {' '.join(packages)}")
+
+    @classmethod
+    def install(
+        cls,
+        packages: List[str],
+    ) -> None:
+        assert cls.is_alpine(), "apk should be used on alpine linux distribution"
+
+        with tempfile.TemporaryDirectory() as tempdir:
+            Invoker.invoke(command=f"cp -p -R /var/cache/apk {tempdir}")
+
+            try:
+                Invoker.invoke(command="apk update")
+
+                Invoker.invoke(command=f"apk add --no-cache {' '.join(packages)}")
+
+            finally:
+                # Note: not using dir/* syntax as that doesnt work on 'sh' shell (alpine)
+                Invoker.invoke(
+                    command=f"rm -r /var/cache/apk && mv {tempdir}/apk /var/cache/apk"
+                )

nanolayer/installers/devcontainer_feature/oci_feature_installer.py

@@ -1,3 +1,4 @@
+import distutils
 import logging
 import os
 import pwd
@@ -6,6 +7,7 @@
 from pathlib import Path
 from typing import Dict, Optional, Union
 
+from nanolayer.installers.apk.apk_installer import ApkInstaller
 from nanolayer.installers.devcontainer_feature.models.devcontainer_feature import (
     Feature,
 )
@@ -27,6 +29,9 @@ class OCIFeatureInstaller:
     class NoPremissions(PermissionError):
         pass
 
+    class OCIFeatureInstallerError(Exception):
+        pass
+
     _ORDERED_BASE_REMOTE_USERS = ("vscode", "node", "codespace")
     _FALLBACK_USER_ID_A = (
         1000  # user 1000 (mostly the base user of the contianer eg. "ubuntu" etc)
@@ -128,8 +133,24 @@ def install(
 
             command += f"./{cls._FEATURE_ENTRYPOINT}"
 
+            # ensure existance of bash in order to succesfully run the command
+            bash_installed = False
+            if distutils.spawn.find_executable("bash") is None:
+                if ApkInstaller.is_alpine():
+                    ApkInstaller.install(packages=["bash"])
+                    bash_installed = True
+                else:
+                    raise cls.OCIFeatureInstallerError(
+                        "no bash detected. please make sure bash is installed"
+                    )
+
             Invoker.invoke(command)
 
+            # now that its no longer needed we remove bash if it was installed by us
+            if bash_installed:
+                if ApkInstaller.is_alpine():
+                    ApkInstaller.delete(packages=["bash"])
+
             cls._set_envs(feature_obj)
 
         if invoke_entrypoint and feature_obj.entrypoint is not None: