# HG changeset patch
# User Matt Harbison <matt_harbison@yahoo.com>
# Date 1639520970 18000
# Node ID f8540fe4be0f12a9e9118523b5f263fa12ab92a8
# Parent  333a2656e98143dd2e258deb7a66f0b978f8c09b
procutil: avoid an uninitialized variable usage on tempfile exception

If `pycompat.unnamedtempfile()` raises an exception, it would have called
`stdin.close()` in the `finally` block without it being initialized first.

Differential Revision: https://phab.mercurial-scm.org/D11928

diff -r 333a2656e981 -r f8540fe4be0f mercurial/utils/procutil.py
--- a/mercurial/utils/procutil.py	Tue Dec 14 17:25:46 2021 -0500
+++ b/mercurial/utils/procutil.py	Tue Dec 14 17:29:30 2021 -0500
@@ -742,6 +742,8 @@
             start_new_session = False
             ensurestart = True
 
+        stdin = None
+
         try:
             if stdin_bytes is None:
                 stdin = subprocess.DEVNULL
@@ -770,7 +772,7 @@
                 record_wait(255)
             raise
         finally:
-            if stdin_bytes is not None:
+            if stdin_bytes is not None and stdin is not None:
                 assert not isinstance(stdin, int)
                 stdin.close()
         if not ensurestart:
@@ -852,6 +854,8 @@
                 return
 
         returncode = 255
+        stdin = None
+
         try:
             if record_wait is None:
                 # Start a new session
@@ -894,7 +898,8 @@
         finally:
             # mission accomplished, this child needs to exit and not
             # continue the hg process here.
-            stdin.close()
+            if stdin is not None:
+                stdin.close()
             if record_wait is None:
                 os._exit(returncode)