[utils] locked_file: Ignore illegal seek on truncate (#3610)

Closes #3557 Authored by: jakeogh
2022-05-01 20:31:06 +00:00 · 2022-05-01 20:31:06 +00:00 · 131e14dc66
commit 131e14dc66
parent 6e634cbe42
1 changed files with 5 additions and 1 deletions
--- a/yt_dlp/utils.py
+++ b/yt_dlp/utils.py
@ -2011,7 +2011,11 @@ class locked_file:
            self.f.close()
            raise
        if 'w' in self.mode:
-            self.f.truncate()
+            try:
+                self.f.truncate()
+            except OSError as e:
+                if e.errno != 29:  # Illegal seek, expected when self.f is a FIFO
+                    raise e
        return self

    def unlock(self):