Issue #6074: Forward port Windows read-only source file fix from 2.7

1 files changed, 6 insertions, 0 deletions

diff --git a/Python/import.c b/Python/import.c
index beb0eecb5a..4695c96970 100644
--- a/Python/import.c
+++ b/Python/import.c
@@ -1174,6 +1174,12 @@ write_compiled_module(PyCodeObject *co, char *cpathname, struct stat *srcstat)
     time_t mtime = srcstat->st_mtime;
 #ifdef MS_WINDOWS   /* since Windows uses different permissions  */
     mode_t mode = srcstat->st_mode & ~S_IEXEC;
+    /* Issue #6074: We ensure user write access, so we can delete it later
+     * when the source file changes. (On POSIX, this only requires write
+     * access to the directory, on Windows, we need write access to the file
+     * as well)
+     */
+    mode |= _S_IWRITE;
 #else
     mode_t mode = srcstat->st_mode & ~S_IXUSR & ~S_IXGRP & ~S_IXOTH;
     mode_t dirmode = (srcstat->st_mode |