command: creation of obsolete marker

* add metadata encoding/decoding ability

* add a method to obsstore to help creating marker

* add a debug command to create marker

tests/test-obsolete.t

@@ -0,0 +1,49 b''
+
+  $ mkcommit() {
+  >    echo "$1" > "$1"
+  >    hg add "$1"
+  >    hg ci -m "add $1"
+  > }
+  $ getid() {
+  >    hg id --debug -ir "desc('$1')"
+  > }
+
+
+  $ hg init tmpa
+  $ cd tmpa
+
+Killing a single changeset without replacement
+
+  $ mkcommit kill_me
+  $ hg debugobsolete -d '0 0' `getid kill_me` -u babar
+  $ cd ..
+
+Killing a single changeset with replacement
+
+  $ hg init tmpb
+  $ cd tmpb
+  $ mkcommit a
+  $ mkcommit b
+  $ mkcommit original_c
+  $ hg up "desc('b')"
+  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
+  $ mkcommit new_c
+  created new head
+  $ hg debugobsolete `getid original_c`  `getid new_c` -d '56 12'
+
+do it again (it read the obsstore before adding new changeset)
+
+  $ hg up '.^'
+  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
+  $ mkcommit new_2_c
+  created new head
+  $ hg debugobsolete -d '1337 0' `getid new_c` `getid new_2_c`
+
+Register two markers with a missing node
+
+  $ hg up '.^'
+  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
+  $ mkcommit new_3_c
+  created new head
+  $ hg debugobsolete -d '1338 0' `getid new_2_c` 1337133713371337133713371337133713371337
+  $ hg debugobsolete -d '1339 0' 1337133713371337133713371337133713371337 `getid new_3_c`

mercurial/commands.py

@@ -2049,6 +2049,21 b' def debugknown(ui, repopath, *ids, **opt'
     flags = repo.known([bin(s) for s in ids])
     ui.write("%s\n" % ("".join([f and "1" or "0" for f in flags])))
 
+@command('debugobsolete', [] + commitopts2,
+         _('OBSOLETED [REPLACEMENT] [REPL...'))
+def debugobsolete(ui, repo, precursor, *successors, **opts):
+    """create arbitrary obsolete marker"""
+    metadata = {}
+    if 'date' in opts:
+        metadata['date'] = opts['date']
+    metadata['user'] = opts['user'] or ui.username()
+    succs = tuple(bin(succ) for succ in successors)
+    l = repo.lock()
+    try:
+        repo.obsstore.create(bin(precursor), succs, 0, metadata)
+    finally:
+        l.release()
+
 @command('debugpushkey', [], _('REPO NAMESPACE [KEY OLD NEW]'))
 def debugpushkey(ui, repopath, namespace, *keyinfo, **opts):
     '''access the pushkey key/value protocol

mercurial/obsolete.py

@@ -135,6 +135,23 b' class obsstore(object):'
         self.precursors = {}
         self.successors = {}
 
+    def create(self, prec, succs=(), flag=0, metadata=None):
+        """obsolete: add a new obsolete marker
+
+        * ensuring it is hashable
+        * check mandatory metadata
+        * encode metadata
+        """
+        if metadata is None:
+            metadata = {}
+        if len(prec) != 20:
+            raise ValueError(prec)
+        for succ in succs:
+            if len(succ) != 20:
+                raise ValueError(prec)
+        marker = (str(prec), tuple(succs), int(flag), encodemeta(metadata))
+        self.add(marker)
+
     def add(self, marker):
         """Add a new marker to the store
 

tests/test-debugcomplete.t

@@ -86,6 +86,7 b' Show debug commands if there are no othe'
   debugindexdot
   debuginstall
   debugknown
+  debugobsolete
   debugpushkey
   debugpvec
   debugrebuildstate
@@ -236,6 +237,7 b' Show all commands + options'
   debugindexdot: 
   debuginstall: 
   debugknown: 
+  debugobsolete: date, user
   debugpushkey: 
   debugpvec: 
   debugrebuildstate: rev