template upload need check

carnival/cmd/transfer.py

@@ -1,7 +1,10 @@
 from io import BytesIO
 from typing import Any
+from hashlib import sha1
 
-from carnival import Connection, Result, SshHost, Host
+from colorama import Fore as F, Style as S  # type: ignore
+
+from carnival import Connection, Result, SshHost, Host, cmd
 from carnival.hosts.local import localhost_connection
 from carnival.templates import render
 
@@ -91,7 +94,7 @@ def put(c: Connection, local: str, remote: str, preserve_mode: bool = True) -> N
     t.put(local=local, remote=remote, preserve_mode=preserve_mode)
 
 
-def put_template(c: Connection, template_path: str, remote: str, **context: Any) -> None:
+def put_template(c: Connection, template_path: str, remote: str, **context: Any) -> bool:
     """
     Отрендерить файл с помощью jinja-шаблонов и закачать на сервер
     См раздел templates.
@@ -104,6 +107,29 @@ def put_template(c: Connection, template_path: str, remote: str, **context: Any)
     :param context: контекс для рендеринга jinja2
     """
     filestr = render(template_path=template_path, **context)
+
+    shasum_exist = cmd.cli.is_cmd_exist(c, "shasum")
+    if shasum_exist is False:
+        print(f"{F.YELLOW}[WARN]{F.RESET} shasum is not found on remote, lazy uploading is not possible")
+        is_remote_exists = True
+
+    if shasum_exist:
+        is_remote_exists = cmd.fs.is_file_exists(c, remote)
+        if is_remote_exists:
+            # Check hashed to prevent unneeded upload
+            filestr_hash = sha1(filestr.encode()).hexdigest()
+            remotehash_result = c.run(f"cat {remote} | shasum -a1", hide=True).stdout.strip(" -\t\n")
+            if filestr_hash == remotehash_result:
+                print(f"{S.BRIGHT}{template_path}{S.RESET_ALL}: {F.GREEN}not changed{F.RESET}")
+                return False
+
     # TODO: c._c ;(
     t = Transfer(c._c)  # type: ignore
     t.put(local=BytesIO(filestr.encode()), remote=remote, preserve_mode=False)
+
+    if is_remote_exists:
+        print(f"{S.BRIGHT}{template_path}{S.RESET_ALL}: {F.YELLOW}updated{F.RESET}")
+    else:
+        print(f"{S.BRIGHT}{template_path}{S.RESET_ALL}: {F.YELLOW}created{F.RESET}")
+
+    return True