Return exit code in 'recall()' and 'migrate()' methods + fixed...

Return exit code in 'recall()' and 'migrate()' methods + fixed 'recallChecksumFiles()' method + minor changes.

Signed-off-by: Cristiano Urban <cristiano.urban@inaf.it>

transfer_service/tape_client.py

@@ -94,10 +94,10 @@ class TapeClient(object):
         out = open("tape_client_log.txt", "a")
         out.write("MIGRATE\n")
         out.write(f"exitCode: {exitCode}\n")
-        out.write(f"stdout: {stdout}\n")
-        out.write(f"stderr: {stderr}\n\n")
         out.close()
         
+        return exitCode
+    
     def recall(self, fileList): 
         """
         Recalls from tape all files whose absolute path is 
@@ -118,16 +118,16 @@ class TapeClient(object):
         out = open("tape_client_log.txt", "a")
         out.write("RECALL\n")
         out.write(f"exitCode: {exitCode}\n")
-        out.write(f"stdout: {stdout}\n")
-        out.write(f"stderr: {stderr}\n\n")
         out.close()
         
+        return exitCode
+    
     def recallChecksumFiles(self, dirName):
         """
         Recursively recalls from tape all the checksum files related to 
         the 'dirName' directory.
         """
-        cmd = f"find $(dirname {dirName}) -type f \( -iname \"*-md5sum.txt\" \) | {self.EEADM}"
+        cmd = f"find $(dirname {dirName}) -type f \( -iname \"*-md5sum.txt\" \) | {self.EEADM} recall"
         stdin, stdout, stderr = self.client.exec_command(cmd)
         exitCode = stdout.channel.recv_exit_status()
         
@@ -135,14 +135,9 @@ class TapeClient(object):
         out = open("tape_client_log.txt", "a")
         out.write("RECALL_CHECKSUM\n")
         out.write(f"exitCode: {exitCode}\n")
-        out.write(f"stdout: {stdout}\n")
-        out.write(f"stderr: {stderr}\n\n")
         out.close()
         
-        if exitCode:
-            return False
-        else:
-            return True
+        return exitCode
     
     def disconnect(self):
         """Closes the connection."""