[PATCH 1 of 4] strip: simplify some repeated conditions

[Martin von Zweigbergk]

# HG changeset patch
# User Martin von Zweigbergk <martinvonz at google.com>
# Date 1473959936 25200
#      Thu Sep 15 10:18:56 2016 -0700
# Node ID fcd760d062be51c78eaea0281bc253ce1022f09f
# Parent  2c302c6544511b37abe61ee2cc5278e4f61d5e71
strip: simplify some repeated conditions

We check "if saveheads or savebases" in several places to see if we
should or have created a bundle of the changesets to apply after
truncating the revlogs. One of the conditions is actually just "if
saveheads", but since there can't be savebases without saveheads, that
is effectively the same condition. It seems simpler to check only once
and from then on see if we created the file.

diff -r 2c302c654451 -r fcd760d062be mercurial/repair.py
--- a/mercurial/repair.py	Wed Sep 14 17:12:39 2016 +0200
+++ b/mercurial/repair.py	Thu Sep 15 10:18:56 2016 -0700
@@ -147,7 +147,8 @@
                        vfs.join(backupfile))
         repo.ui.log("backupbundle", "saved backup bundle to %s\n",
                     vfs.join(backupfile))
-    if saveheads or savebases:
+    chgrpfile = None
+    if saveheads:
         # do not compress partial bundle if we remove it from disk later
         chgrpfile = _bundle(repo, savebases, saveheads, node, 'temp',
                             compress=False)
@@ -184,7 +185,7 @@
                 if troffset == 0:
                     repo.store.markremoved(file)
 
-        if saveheads or savebases:
+        if chgrpfile:
             ui.note(_("adding branch\n"))
             f = vfs.open(chgrpfile, "rb")
             gen = exchange.readbundle(ui, f, chgrpfile, vfs)
@@ -229,12 +230,12 @@
         if backupfile:
             ui.warn(_("strip failed, full bundle stored in '%s'\n")
                     % vfs.join(backupfile))
-        elif saveheads:
+        elif chgrpfile:
             ui.warn(_("strip failed, partial bundle stored in '%s'\n")
                     % vfs.join(chgrpfile))
         raise
     else:
-        if saveheads or savebases:
+        if chgrpfile:
             # Remove partial backup only if there were no exceptions
             vfs.unlink(chgrpfile)