repair: add functionality to rebuild fncache Currently, there is no way to recover from a missing or corrupt fncache file in place (a clone is required). For certain use cases such as servers and with large repositories, an in-place repair may be desirable. This patch adds functionality for in-place repair of the fncache. The `hg debugrebuildfncache` command is introduced. It ensures the fncache is up to date by reconstructing the fncache from all seen files encountered during a brute force traversal of the repository's entire history. The command will add missing entries and will prune excess ones. Currently, the command no-ops unless the repository has the fncache requirement. The command could later grow the ability to "upgrade" an existing repository to be fncache enabled, if desired. When testing this patch on a local clone of the Firefox repository, it removed a bunch of entries. Investigation revealed that removed entries belonged to empty (0 byte size) .i filelogs. The functionality for pruning fncache of stripped revlogs was introduced in f49d60fa40a5, so the presence of these entries likely predates this feature.

--- a/tests/test-help.t	Tue Jun 23 13:56:53 2015 -0400
+++ b/tests/test-help.t	Mon Jun 22 09:59:48 2015 -0700
@@ -796,6 +796,8 @@
    debugrebuilddirstate
                  rebuild the dirstate as it would look like for the given
                  revision
+   debugrebuildfncache
+                 rebuild the fncache file
    debugrename   dump rename information
    debugrevlog   show data and statistics about a revlog
    debugrevspec  parse and apply a revision specification