repair: do not compress partial bundle if we do not keep it on disk

A partial bundle is created to temporarily save revisions > rev but
not descending from the node to strip, to be able to restore the
changesets after stripping the changelog.
Since this bundle is not kept after the strip operation, and is not
user-visible, it is not necessary and should be faster to avoid
compression.

mercurial/repair.py

@@ -11,14 +11,18 b' from node import nullrev, short'
 from i18n import _
 import os
 
-def _bundle(repo, bases, heads, node, suffix, extranodes=None):
+def _bundle(repo, bases, heads, node, suffix, extranodes=None, compress=True):
     """create a bundle with the specified revisions as a backup"""
     cg = repo.changegroupsubset(bases, heads, 'strip', extranodes)
     backupdir = repo.join("strip-backup")
     if not os.path.isdir(backupdir):
         os.mkdir(backupdir)
     name = os.path.join(backupdir, "%s-%s.hg" % (short(node), suffix))
-    return changegroup.writebundle(cg, name, "HG10BZ")
+    if compress:
+        bundletype = "HG10BZ"
+    else:
+        bundletype = "HG10UN"
+    return changegroup.writebundle(cg, name, bundletype)
 
 def _collectfiles(repo, striprev):
     """find out the filelogs affected by the strip"""
@@ -69,6 +73,8 b' def strip(ui, repo, node, backup="all"):'
     # TODO delete the undo files, and handle undo of merge sets
     striprev = cl.rev(node)
 
+    keeppartialbundle = backup == 'strip'
+
     # Some revisions with rev > striprev may not be descendants of striprev.
     # We have to find these revisions and put them in a bundle, so that
     # we can restore them after the truncations.
@@ -110,8 +116,9 b' def strip(ui, repo, node, backup="all"):'
         backupfile = _bundle(repo, [node], cl.heads(), node, 'backup')
         repo.ui.status(_("saved backup bundle to %s\n") % backupfile)
     if saveheads or extranodes:
+        # do not compress partial bundle if we remove it from disk later
         chgrpfile = _bundle(repo, savebases, saveheads, node, 'temp',
-                            extranodes)
+                            extranodes=extranodes, compress=keeppartialbundle)
 
     mfst = repo.manifest
 
@@ -146,7 +153,7 b' def strip(ui, repo, node, backup="all"):'
             if not repo.ui.verbose:
                 repo.ui.popbuffer()
             f.close()
-            if backup != "strip":
+            if not keeppartialbundle:
                 os.unlink(chgrpfile)
     except:
         if backupfile: