If podman or docker is available and we are not in a container

We should re-exec this script inside a llama.cpp container (incomplete
in this commit), truth is these AI runtime evironment are complex to
set up by say installing a few packages, etc. Although if one does want
to run outside a container and or say they are running on macOS we
should support that.

Signed-off-by: Eric Curtin <[email protected]>

ramalama

@@ -160,6 +160,26 @@ def get_ramalama_store():
     return os.path.expanduser("~/.local/share/ramalama")
 
 
+def in_container():
+    if os.path.exists("/run/.containerenv") or os.path.exists("/.dockerenv") or os.getenv("container"):
+        return True
+
+    return False
+
+
+def available(command):
+    return shutil.which(command) is not None
+
+
+def select_container_manager():
+    if available("podman"):
+        return "podman"
+    elif available("docker"):
+        return "docker"
+
+    return ""
+
+
 def main():
     if len(sys.argv) < 2:
         usage()