lfs: add git to the User-Agent header for blob transfers As we were trying to transition off of the non production lfs-test-server for further experimenting, one of the problems we ran into was interoperability. A coworker setup gitbucket[1] to act as the blob server, tested with git, and passed it off to me. But push failed with a message saying "abort: LFS server returns invalid JSON:", and then proceeded to dump a huge HTML page to the screen. It turns out that it is assuming that git is the only thing that wants to do a blob transfer, and everything else is a web browser wanting HTML. It's only a single data point, but I suspect other things may be doing this too. RFC7231 gives an example [2] of listing multiple products in decreasing order of significance. Since the standard provides for this, and since it works with the one problematic server I found, I'm just enabling this by default for a better UX. There's nothing significant about the version of git chosen, other than it is the current version. [1] https://github.com/gitbucket/gitbucket/ [2] https://tools.ietf.org/html/rfc7231#page-46

--- a/hgext/lfs/blobstore.py	Thu Dec 14 15:03:55 2017 -0800
+++ b/hgext/lfs/blobstore.py	Thu Dec 14 13:04:08 2017 -0500
@@ -125,7 +125,8 @@
         self.ui = ui
         baseurl, authinfo = url.authinfo()
         self.baseurl = baseurl.rstrip('/')
-        self.urlopener = urlmod.opener(ui, authinfo)
+        useragent = 'mercurial/%s git/2.15.1' % util.version()
+        self.urlopener = urlmod.opener(ui, authinfo, useragent)
         self.retry = ui.configint('lfs', 'retry')
 
     def writebatch(self, pointers, fromstore):