branchmap: explicitly convert file into iterator
Follows up
2a4bfbb52111. This is required for httprangereader, which is not
an iterable itself.
--- a/mercurial/branchmap.py Fri Aug 17 10:25:39 2018 +0900
+++ b/mercurial/branchmap.py Fri Aug 17 10:51:05 2018 +0900
@@ -41,7 +41,8 @@
f = None
try:
f = repo.cachevfs(_filename(repo))
- cachekey = next(f).rstrip('\n').split(" ", 2)
+ lineiter = iter(f)
+ cachekey = next(lineiter).rstrip('\n').split(" ", 2)
last, lrev = cachekey[:2]
last, lrev = bin(last), int(lrev)
filteredhash = None
@@ -53,7 +54,7 @@
# invalidate the cache
raise ValueError(r'tip differs')
cl = repo.changelog
- for l in f:
+ for l in lineiter:
l = l.rstrip('\n')
if not l:
continue