cleanly abort on unknown archive type (issue966)

mercurial/archival.py

@@ -208,6 +208,8 b' def archive(repo, dest, node, kind, deco'
         archiver.addfile(name, mode, islink, data)
 
     ctx = repo.changectx(node)
+    if kind not in archivers:
+        raise util.Abort(_("unknown archive type '%s'" % kind))
     archiver = archivers[kind](dest, prefix, mtime or ctx.date()[0])
     m = ctx.manifest()
     items = m.items()

tests/test-archive

@@ -69,6 +69,8 b' if [ -f rev-0.tar ]; then'
     echo 'rev-0.tar created'
 fi
 
+hg archive -t bogus test.bogus
+
 echo '% empty repo'
 hg init ../empty
 cd ../empty

tests/test-archive.out

@@ -39,5 +39,6 b' test-TIP/bar'
 test-TIP/baz/bletch
 test-TIP/foo
 rev-0.tar created
+abort: unknown archive type 'bogus'
 % empty repo
 abort: repository has no revisions