From 73764a9e0d6f42158e57d0e93ed1ace3ecbfc99e Mon Sep 17 00:00:00 2001
From: The MMGen Project <mmgen@tuta.io>
Date: Fri, 7 Aug 2026 09:37:47 +0000
Subject: [PATCH] ruff SIM115 (use context manager for opening files)

---
 mmgen/devtools.py          | 3 ++-
 mmgen/tool/fileutil.py     | 5 +----
 pyproject.toml             | 6 ++++--
 test/modtest_d/devtools.py | 3 ++-
 test/modtest_d/rune.py     | 6 ++++--
 5 files changed, 13 insertions(+), 10 deletions(-)

diff --git a/mmgen/devtools.py b/mmgen/devtools.py
index 4e6c379f..6976b394 100755
--- a/mmgen/devtools.py
+++ b/mmgen/devtools.py
@@ -56,7 +56,8 @@ def Pexit(*args):
 def print_stack_trace(message=None, fh_list=[], nl='\n', sep='\n  ', trim=4):
 	if not fh_list:
 		import os
-		fh_list.append(open(f'devtools.trace.{os.getpid()}', 'w'))
+		with open(f'devtools.trace.{os.getpid()}', 'w') as fh:
+			fh_list.append(fh)
 		nl = ''
 	res = get_stack_trace(message, nl, sep, trim)
 	sys.stderr.write(res)
diff --git a/mmgen/tool/fileutil.py b/mmgen/tool/fileutil.py
index dea5c007..318787f3 100755
--- a/mmgen/tool/fileutil.py
+++ b/mmgen/tool/fileutil.py
@@ -113,8 +113,6 @@ class tool_cmd(tool_cmd_base):
 		if self.cfg.outdir:
 			outfile = make_full_path(self.cfg.outdir, outfile)
 
-		fh = open(outfile, 'wb')
-
 		blk_size = 1024 * 1024
 		key = Crypto(self.cfg).get_random(32)
 		q1, q2 = (Queue(), Queue())
@@ -127,7 +125,7 @@ class tool_cmd(tool_cmd_base):
 		for i in range(max(1, threads - 1)):
 			Thread(target=encrypt_worker, daemon=True).start()
 
-		if True:
+		with open(outfile, 'wb') as fh:
 			Thread(target=output_worker, args=(fh,), daemon=True).start()
 
 			for i in range(nbytes // blk_size):
@@ -140,7 +138,6 @@ class tool_cmd(tool_cmd_base):
 
 			q1.join()
 			q2.join()
-			fh.close()
 
 		if (fsize := os.stat(outfile).st_size) != nbytes:
 			die(3, f'{fsize}: incorrect random file size (should be {nbytes})')
diff --git a/pyproject.toml b/pyproject.toml
index 5f43eaf2..ebdaf61b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -35,7 +35,6 @@ ignore = [
 	"S110", # `try`-`except`-`pass` detected, consider logging the exception
 	"SIM102", # Use a single `if` statement instead of nested `if` statements
 	"SIM114", # Combine `if` branches using logical `or` operator
-	"SIM115", # Use a context manager for opening files
 	"SIM118", # Use `key in dict` instead of `key in dict.keys()`
 	"SIM201", # Use `path.stat().st_mode & S_IWUSR | S_IRUSR != S_IWUSR | S_IRUSR` instead of `not path.stat().st_mode & S_IWUSR | S_IRUSR == S_IWUSR | S_IRUSR`
 	"SIM210", # Use `bool(...)` instead of `True if ... else False`
@@ -68,6 +67,10 @@ ignore = [
 	"F821",   # undefined name 'cfg'
 	"PLW0406" # self-import
 ]
+"test/*" = [
+	"SIM115",  # open() with context manager
+	"ASYNC230" # open() in async func
+]
 "test/misc/input_func.py"       = [ "F401" ]         # imported but unused
 "test/modtest_d/cashaddr.py"    = [ "F841" ]         # assigned to but never used
 "test/modtest_d/dep.py"         = [ "F401" ]         # imported but unused
@@ -79,7 +82,6 @@ ignore = [
 "test/*.py"                     = [ "F401" ]         # imported but unused
 "test/colortest.py"             = [ "F403", "F405" ] # `import *` used
 "test/tooltest2.py"             = [ "F403", "F405" ] # `import *` used
-"test/*"                        = [ "ASYNC230" ]     # open() in async function
 "test/cmdtest_d/*"              = [ "ASYNC251" ]     # time.sleep() in async function
 "test/overlay/tree/*"           = [ "ALL" ]
 
diff --git a/test/modtest_d/devtools.py b/test/modtest_d/devtools.py
index ed5ade67..3f25b258 100755
--- a/test/modtest_d/devtools.py
+++ b/test/modtest_d/devtools.py
@@ -70,7 +70,8 @@ class unit_tests:
 
 	def stack_trace(self, name, ut):
 		print_hdr('stack trace')
-		print_stack_trace('Test', fh_list=[open(os.devnull, 'w')], trim=0)
+		with open(os.devnull, 'w') as fh:
+			print_stack_trace('Test', fh_list=[fh], trim=0)
 		return True
 
 	def obj_pmsg(self, name, ut):
diff --git a/test/modtest_d/rune.py b/test/modtest_d/rune.py
index 5ad5d58d..54ddf0de 100755
--- a/test/modtest_d/rune.py
+++ b/test/modtest_d/rune.py
@@ -145,7 +145,8 @@ def test_tx(src, cfg, vec):
 
 	match src:
 		case 'parse':
-			tx_in = open(os.path.join('test/ref/thorchain', vec.fn), 'br').read()
+			with open(os.path.join('test/ref/thorchain', vec.fn), 'rb') as fh:
+				tx_in = fh.read()
 			tx = RuneTx.loads(tx_in)
 			if not parms.from_addr:
 				ymsg(f'Warning: missing test vector data for {vec.fn}')
@@ -215,7 +216,8 @@ class unit_tests:
 
 		addr = 'thor1lukwlve7hayy66qrdkp4k7sh0emjqwergy7tl3'
 		txhash = 'abcdef01' * 8
-		txbytes = open('test/ref/thorchain/mainnet-tx-msgsend1.binpb', 'rb').read()
+		with open('test/ref/thorchain/mainnet-tx-msgsend1.binpb', 'rb') as fh:
+			txbytes = fh.read()
 
 		async def main():