D2720: debugcommands: introduce actions to perform deterministic reads

[indygreg (Gregory Szorc)]

indygreg updated this revision to Diff 6976.
indygreg edited the summary of this revision.

REPOSITORY
  rHG Mercurial

CHANGES SINCE LAST UPDATE
  https://phab.mercurial-scm.org/D2720?vs=6714&id=6976

REVISION DETAIL
  https://phab.mercurial-scm.org/D2720

AFFECTED FILES
  mercurial/debugcommands.py

CHANGE DETAILS

diff --git a/mercurial/debugcommands.py b/mercurial/debugcommands.py
--- a/mercurial/debugcommands.py
+++ b/mercurial/debugcommands.py
@@ -2701,6 +2701,21 @@
 
     Read a line of output from the server. If there are multiple output
     pipes, reads only the main pipe.
+
+    ereadline
+    ---------
+
+    Like ``readline``, but read from the stderr pipe, if available.
+
+    read <X>
+    --------
+
+    ``read()`` N bytes from the server's main output pipe.
+
+    eread <X>
+    ---------
+
+    ``read()`` N bytes from the server's stderr pipe, if available.
     """
     opts = pycompat.byteskwargs(opts)
 
@@ -2841,6 +2856,14 @@
             stderr.read()
         elif action == 'readline':
             stdout.readline()
+        elif action == 'ereadline':
+            stderr.readline()
+        elif action.startswith('read '):
+            count = int(action.split(' ', 1)[1])
+            stdout.read(count)
+        elif action.startswith('eread '):
+            count = int(action.split(' ', 1)[1])
+            stderr.read(count)
         else:
             raise error.Abort(_('unknown action: %s') % action)
 



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Cc: mharbison72, mercurial-devel