packs: add debug commands to view pack contents

Summary: Some simple debug commands to print the contents of each pack.

Test Plan: Ran it manually, and added a simple test

Reviewers: #mercurial, ttung, mitrandir

Reviewed By: mitrandir

Differential Revision: https://phabricator.intern.facebook.com/D3277233

Signature: t1:3277233:1463085196:c54fc875d536a96150bb1461b77247a5d7a9402c

remotefilelog/__init__.py

@@ -754,6 +754,16 @@ def debugremotefilelog(ui, *args, **opts):
 def verifyremotefilelog(ui, *args, **opts):
     return debugcommands.verifyremotefilelog(ui, *args, **opts)
 
+@command('debugdatapack', [
+    ], _('hg debugdatapack <path>'), norepo=True)
+def debugremotefilelog(ui, path, *args, **opts):
+    return debugcommands.debugdatapack(ui, path, *args, **opts)
+
+@command('debughistorypack', [
+    ], _('hg debughistorypack <path>'), norepo=True)
+def debughistorypack(ui, path, *args, **opts):
+    return debugcommands.debughistorypack(ui, path, *args, **opts)
+
 @command('prefetch', [
     ('r', 'rev', [], _('prefetch the specified revisions'), _('REV')),
     ] + commands.walkopts, _('hg prefetch [OPTIONS] [FILE...]'))

remotefilelog/debugcommands.py

@@ -8,7 +8,7 @@
 from mercurial import util, filelog, revlog
 from mercurial.node import bin, hex, nullid, nullrev, short
 from mercurial.i18n import _
-import shallowrepo
+import datapack, historypack, shallowrepo
 import os, lz4
 
 def debugremotefilelog(ui, *args, **opts):
@@ -190,3 +190,35 @@ def parsefileblob(path, decompress):
         start = divider + 1
 
     return size, firstnode, mapping
+
+def debugdatapack(ui, path, *args, **kwargs):
+    dpack = datapack.datapack(path)
+
+    lastfilename = None
+    for filename, node, deltabase, deltalen in dpack.iterentries():
+        if filename != lastfilename:
+            ui.write("\n%s\n" % filename)
+            ui.write("%s%s%s\n" % (
+                "Node".ljust(14),
+                "Delta Base".ljust(14),
+                "Delta Length".ljust(6)))
+            lastfilename = filename
+        ui.write("%s  %s  %s\n" % (short(node), short(deltabase), deltalen))
+
+def debughistorypack(ui, path, *args, **kwargs):
+    hpack = historypack.historypack(path)
+
+    lastfilename = None
+    for entry in hpack.iterentries():
+        filename, node, p1node, p2node, linknode, copyfrom = entry
+        if filename != lastfilename:
+            ui.write("\n%s\n" % filename)
+            ui.write("%s%s%s%s%s\n" % (
+                "Node".ljust(14),
+                "P1 Node".ljust(14),
+                "P2 Node".ljust(14),
+                "Link Node".ljust(14),
+                "Copy From"))
+            lastfilename = filename
+        ui.write("%s  %s  %s  %s  %s\n" % (short(node), short(p1node),
+            short(p2node), short(linknode), copyfrom))

tests/test-repack.t

@@ -123,6 +123,24 @@
   $TESTTMP/hgcache/master/packs/92a06d8b76a23b6e6150cf877ea75ed993e0b2d8.dataidx
   $TESTTMP/hgcache/master/packs/92a06d8b76a23b6e6150cf877ea75ed993e0b2d8.datapack
 
+# Test debug commands
+
+  $ hg debugdatapack $TESTTMP/hgcache/master/packs/92a06d8b76a23b6e6150cf877ea75ed993e0b2d8
+  
+  x
+  Node          Delta Base    Delta Length
+  1bb2e6237e03  000000000000  13
+  d4a3ed9310e5  1bb2e6237e03  17
+  aee31534993a  d4a3ed9310e5  17
+  $ hg debughistorypack $TESTTMP/hgcache/master/packs/3bebfba849e7aed8e598b92b296aeaff4784393b
+  
+  x
+  Node          P1 Node       P2 Node       Link Node     Copy From
+  1bb2e6237e03  d4a3ed9310e5  000000000000  0b03bbc9e1e7  
+  d4a3ed9310e5  aee31534993a  000000000000  421535db10b6  
+  aee31534993a  1406e7411862  000000000000  a89d614e2364  
+  1406e7411862  000000000000  000000000000  b292c1e3311f  
+
 # Test copy tracing from a pack
   $ cd ../master
   $ hg mv x y