fix/get new tomo ID

csaxs_bec/bec_ipython_client/plugins/omny/omny_general_tools.py

@@ -253,7 +253,7 @@ class TomoIDManager:
     OMNY_URL = "https://v1p0zyg2w9n2k9c1.myfritz.net/samples/newmeasurement.php"
     OMNY_USER = ""
     OMNY_PASSWORD = ""
-    TMP_FILE = "/tmp/currsamplesnr.txt"
+    TMP_FILE = "~/currsamplesnr.txt"
 
     def register(
         self,
@@ -295,9 +295,22 @@ class TomoIDManager:
         #     shell=True,
         # )
         #print(url)
-        subprocess.run(
-            f"wget -q -O {self.TMP_FILE} '{url}'",
+        tmp_file = os.path.expanduser(self.TMP_FILE)
+        result = subprocess.run(
+            f"wget -q -O {tmp_file} '{url}'",
             shell=True,
         )
-        with open(self.TMP_FILE) as f:
-            return int(f.read())
+        if result.returncode != 0:
+            raise OMNYToolsError(
+                f"wget failed (exit code {result.returncode}) fetching tomo ID from {self.OMNY_URL}"
+            )
+        try:
+            with open(tmp_file) as f:
+                content = f.read().strip()
+            return int(content)
+        except FileNotFoundError as exc:
+            raise OMNYToolsError(f"wget did not produce output file {tmp_file}") from exc
+        except ValueError as exc:
+            raise OMNYToolsError(
+                f"Unexpected response from tomo ID server, got: {content!r}"
+            ) from exc