Do not show pulse progress when the output is not a tty

This prevents download progress messages showing up in logfiles
when python-apt is used for the downloading.

1 files changed, 5 insertions, 0 deletions

diff --git a/apt/progress/text.py b/apt/progress/text.py
index 04673de..05925d3 100644
--- a/apt/progress/text.py
+++ b/apt/progress/text.py
@@ -159,6 +159,11 @@ class AcquireProgress(base.AcquireProgress, TextProgress):
 
         Return False if the user asked to cancel the whole Acquire process."""
         base.AcquireProgress.pulse(self, owner)
+        # only show progress on a tty to not clutter log files etc
+        if hasattr(self._file, "fileno") and not os.isatty(self._file.fileno()):
+            return True
+
+        # calculate progress
         percent = (((self.current_bytes + self.current_items) * 100.0) /
                         float(self.total_bytes + self.total_items))