bitbake: prserv: add "upstream" server support

Introduce a PRSERVER_UPSTREAM variable that makes the
local PR server connect to an "upstream" one.

This makes it possible to implement local fixes to an
upstream package (revision "x", in a way that gives the local
update priority (revision "x.y").

Update the calculation of the new revisions to support the
case when prior revisions are not integers, but have
an "x.y..." format."

Set the comments in the handle_get_pr() function in serv.py
for details about the calculation of the local revision.

This is done by going on supporting the "history" mode that
wasn't used so far (revisions can return to a previous historical value),
in addition to the default "no history" mode (revisions can never decrease).

Rather than storing the history mode in the database table
itself (i.e. "PRMAIN_hist" and "PRMAIN_nohist"), the history mode
is now passed through the client requests. As a consequence, the
table name is now "PRMAIN", which is incompatible with what
was generated before, but avoids confusion if we kept the "PRMAIN_nohist"
name for both "history" and "no history" modes.

Update the server version to "2.0.0".

(Bitbake rev: 48857ec3e075791bd73d92747c609a0a4fda0e0c)

Signed-off-by: Michael Opdenacker <michael.opdenacker@bootlin.com>
Cc: Joshua Watt <JPEWhacker@gmail.com>
Cc: Tim Orling <ticotimo@gmail.com>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/bin/bitbake-prserv

@@ -16,7 +16,7 @@ sys.path.insert(0, os.path.join(os.path.dirname(os.path.dirname(__file__)), "lib
 import prserv
 import prserv.serv
 
-VERSION = "1.1.0"
+VERSION = "2.0.0"
 
 PRHOST_DEFAULT="0.0.0.0"
 PRPORT_DEFAULT=8585
@@ -77,12 +77,25 @@ def main():
         action="store_true",
         help="open database in read-only mode",
     )
+    parser.add_argument(
+        "-u",
+        "--upstream",
+        default=os.environ.get("PRSERVER_UPSTREAM", None),
+        help="Upstream PR service (host:port)",
+    )
 
     args = parser.parse_args()
     init_logger(os.path.abspath(args.log), args.loglevel)
 
     if args.start:
-        ret=prserv.serv.start_daemon(args.file, args.host, args.port, os.path.abspath(args.log), args.read_only)
+        ret=prserv.serv.start_daemon(
+            args.file,
+            args.host,
+            args.port,
+            os.path.abspath(args.log),
+            args.read_only,
+            args.upstream
+        )
     elif args.stop:
         ret=prserv.serv.stop_daemon(args.host, args.port)
     else: