The readline package doesn't return the errno for some errors in write_history, append_history, and history_truncate_file. This caused an error in the CPython interpreter(at exit time) when the .python_history file was not writable.
In particular these calls return -1 when the internal`histfile_restore`call
fails because`rename`fails. It's fine for`histfile_restore`to return the result
from`rename`, but this should be checked for failure (e.g. -1) and handled
appropriately by the caller in`history_do_write`and`history_truncate_file`. For
example, in`history_do_write`they do the following:
if (rv == 0 && histname && tempname)
rv = histfile_restore (tempname, histname);
if (rv != 0)
{
if (tempname)
unlink (tempname);
history_lines_written_to_file = 0;
}
This needs a simple fix to update the value of`rv`when`histfile_restore`fails:
if (rv == 0 && histname && tempname)
rv = histfile_restore (tempname, histname);
if (rv != 0) {
rv = errno;
if (tempname)
unlink(tempname);
history_lines_written_to_file = 0;
}
Code snippet taken from
https://github.com/python/cpython/pull/18299#issuecomment-580883515
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