From 404af22bf71056009ae34518d67939da279bf922 Mon Sep 17 00:00:00 2001
From: "H. Shay" <hillerys@element.io>
Date: Tue, 21 Mar 2023 17:38:10 -0700
Subject: [PATCH 1/3] check if specified sqlite databse is a file, if it isn't
 throw an error and exit

---
 synapse/_scripts/synapse_port_db.py | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/synapse/_scripts/synapse_port_db.py b/synapse/_scripts/synapse_port_db.py
index 78d76d38ad90..b2c2b1f6bba3 100755
--- a/synapse/_scripts/synapse_port_db.py
+++ b/synapse/_scripts/synapse_port_db.py
@@ -18,6 +18,7 @@
 import argparse
 import curses
 import logging
+import os
 import sys
 import time
 import traceback
@@ -1326,6 +1327,11 @@ def main() -> None:
         filename="port-synapse.log" if args.curses else None,
     )
 
+    if not os.path.isfile(args.sqlite_database):
+        sys.stderr.write("The sqlite database you specified does not exist, please check that you have the" \
+        "correct path.")
+        sys.exit(1)
+
     sqlite_config = {
         "name": "sqlite3",
         "args": {

From db62d92944ef5eab57f5acda4066af52d5a18406 Mon Sep 17 00:00:00 2001
From: "H. Shay" <hillerys@element.io>
Date: Tue, 21 Mar 2023 17:46:23 -0700
Subject: [PATCH 2/3] add a check to determine that sqlite db exists before
 trying to port from it

---
 synapse/_scripts/synapse_port_db.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/synapse/_scripts/synapse_port_db.py b/synapse/_scripts/synapse_port_db.py
index b2c2b1f6bba3..94b86c1d6ff5 100755
--- a/synapse/_scripts/synapse_port_db.py
+++ b/synapse/_scripts/synapse_port_db.py
@@ -1328,8 +1328,10 @@ def main() -> None:
     )
 
     if not os.path.isfile(args.sqlite_database):
-        sys.stderr.write("The sqlite database you specified does not exist, please check that you have the" \
-        "correct path.")
+        sys.stderr.write(
+            "The sqlite database you specified does not exist, please check that you have the"
+            "correct path."
+        )
         sys.exit(1)
 
     sqlite_config = {

From 422dec0966e01fde10845658dd0440a3d99c689c Mon Sep 17 00:00:00 2001
From: "H. Shay" <hillerys@element.io>
Date: Tue, 21 Mar 2023 17:46:29 -0700
Subject: [PATCH 3/3] newsfragment

---
 changelog.d/15306.bugfix | 2 ++
 1 file changed, 2 insertions(+)
 create mode 100644 changelog.d/15306.bugfix

diff --git a/changelog.d/15306.bugfix b/changelog.d/15306.bugfix
new file mode 100644
index 000000000000..f5eb716f12c5
--- /dev/null
+++ b/changelog.d/15306.bugfix
@@ -0,0 +1,2 @@
+Add a check to [SQLite port_db script](https://matrix-org.github.io/synapse/latest/postgres.html#porting-from-sqlite)
+to ensure that the sqlite database passed to the script exists before trying to port from it.