Use context manager for file I/O.

There are a few cases where a context manager cannot be used, such as
the logger.

1 files changed, 10 insertions, 3 deletions

diff --git a/mesonbuild/scripts/vcstagger.py b/mesonbuild/scripts/vcstagger.py
index 390e37a8d..3f36e0af4 100644
--- a/mesonbuild/scripts/vcstagger.py
+++ b/mesonbuild/scripts/vcstagger.py
@@ -23,9 +23,16 @@ def config_vcs_tag(infile, outfile, fallback, source_dir, replace_string, regex_
     except Exception:
         new_string = fallback
 
-    new_data = open(infile).read().replace(replace_string, new_string)
-    if (not os.path.exists(outfile)) or (open(outfile).read() != new_data):
-        open(outfile, 'w').write(new_data)
+    with open(infile) as f:
+        new_data = f.read().replace(replace_string, new_string)
+    if os.path.exists(outfile):
+        with open(outfile) as f:
+            needs_update = (f.read() != new_data)
+    else:
+        needs_update = True
+    if needs_update:
+        with open(outfile, 'w') as f:
+            f.write(new_data)
 
 def run(args):
     infile, outfile, fallback, source_dir, replace_string, regex_selector = args[0:6]