Correct the information printed by '/usr/bin/tahoe debug --help' on Debian/Ubuntu...

diff --git a/src/allmydata/scripts/debug.py b/src/allmydata/scripts/debug.py
index a046578b7b560f4248fd3310e18735466c415a6f..a943507b7fd8d23619201e2c174bafd721762715 100644 (file)
--- a/src/allmydata/scripts/debug.py
+++ b/src/allmydata/scripts/debug.py
@@ -846,7 +846,18 @@ Subcommands:
 
 Please run e.g. 'tahoe debug dump-share --help' for more details on each
 subcommand.
-
+"""
+        # See ticket #1441 for why we print different information when
+        # run via /usr/bin/tahoe. Note that argv[0] is the full path.
+        if sys.argv[0] == '/usr/bin/tahoe':
+           t += """
+To get branch coverage for the Tahoe test suite (on the installed copy of
+Tahoe), install the 'python-coverage' package and then use:
+
+    python-coverage run --branch /usr/bin/tahoe debug trial
+"""
+        else:
+           t += """
 Another debugging feature is that bin%stahoe allows executing an arbitrary
 "runner" command (typically an installed Python script, such as 'coverage'),
 with the Tahoe libraries on the PYTHONPATH. The runner command name is