largefiles: make cloning not ask two times about password (issue4883)

Before this commit url.opener overwritten stored password
for connection with given url/user even when
new password for given connection was not filled. This
commit makes opener overwrites saved authentication only
when it contains password.

mercurial/url.py

@@ -493,8 +493,10 b' def opener(ui, authinfo=None):'
 
     passmgr = passwordmgr(ui, ui.httppasswordmgrdb)
     if authinfo is not None:
-        passmgr.add_password(*authinfo)
-        user, passwd = authinfo[2:4]
+        realm, uris, user, passwd = authinfo
+        saveduser, savedpass = passmgr.find_stored_password(uris[0])
+        if user != saveduser or passwd:
+            passmgr.add_password(realm, uris, user, passwd)
         ui.debug('http auth: user %s, password %s\n' %
                  (user, passwd and '*' * len(passwd) or 'not set'))
 

tests/test-largefiles-wireproto.t

@@ -380,4 +380,60 b' available locally.'
 
   $ killdaemons.py
 
+largefiles should not ask for password again after succesfull authorization
+
+  $ hg init credentialmain
+  $ cd credentialmain
+  $ echo "aaa" >> a
+  $ hg add --large a
+  $ hg commit -m "a"
+  Invoking status precommit hook
+  A a
+
+Before running server clear the user cache to force clone to download
+a large file from the server rather than to get it from the cache
+
+  $ rm "${USERCACHE}"/*
+
+  $ cd ..
+  $ cat << EOT > userpass.py
+  > import base64
+  > from mercurial.hgweb import common
+  > def perform_authentication(hgweb, req, op):
+  >     auth = req.env.get('HTTP_AUTHORIZATION')
+  >     if not auth:
+  >         raise common.ErrorResponse(common.HTTP_UNAUTHORIZED, 'who',
+  >                 [('WWW-Authenticate', 'Basic Realm="mercurial"')])
+  >     if base64.b64decode(auth.split()[1]).split(':', 1) != ['user', 'pass']:
+  >         raise common.ErrorResponse(common.HTTP_FORBIDDEN, 'no')
+  > def extsetup():
+  >     common.permhooks.insert(0, perform_authentication)
+  > EOT
+  $ hg serve --config extensions.x=userpass.py -R credentialmain \
+  >          -d -p $HGPORT --pid-file hg.pid -A access.log
+  $ cat hg.pid >> $DAEMON_PIDS
+  $ cat << EOF > get_pass.py
+  > import getpass
+  > def newgetpass(arg):
+  >   return "pass"
+  > getpass.getpass = newgetpass
+  > EOF
+  $ hg clone --config ui.interactive=true --config extensions.getpass=get_pass.py \
+  >          http://user@localhost:$HGPORT credentialclone
+  requesting all changes
+  http authorization required for http://localhost:$HGPORT/
+  realm: mercurial
+  user: user
+  password: adding changesets
+  adding manifests
+  adding file changes
+  added 1 changesets with 1 changes to 1 files
+  updating to branch default
+  getting changed largefiles
+  1 largefiles updated, 0 removed
+  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
+
+  $ rm hg.pid access.log
+  $ killdaemons.py
+
 #endif