fast-import: Allow filemodify to set the root
v1.7.3-rc0~75^2 (Teach fast-import to import subtrees named by tree id, 2010-06-30) has a shortcoming - it doesn't allow the root to be set. Extend this behaviour by allowing the root to be referenced as the empty path, "". For a command (like filter-branch --subdirectory-filter) that wants to commit a lot of trees that already exist in the object db, writing undeltified objects as loose files only to repack them later can involve a significant amount of overhead. (23% slow-down observed on Linux 2.6.35, worse on Mac OS X 10.6) Fortunately we have fast-import (which is one of the only git commands that will write to a pack directly) but there is not an advertised way to tell fast-import to commit a given tree without unpacking it. This patch changes that, by allowing M 040000 <tree id> "" as a filemodify line in a commit to reset to a particular tree without any need to parse it. For example, M 040000 4b825dc642cb6eb9a060e54bf8d69288fbee4904 "" is a synonym for the deleteall command and the fast-import equivalent of git read-tree 4b825dc642cb6eb9a060e54bf8d69288fbee4904 Signed-off-by: NDavid Barr <david.barr@cordelta.com> Commit-message-by: NJonathan Nieder <jrnieder@gmail.com> Acked-by: NSverre Rabbelier <srabbelier@gmail.com> Tested-by: NRamkumar Ramachandra <artagnon@gmail.com> Signed-off-by: NRamkumar Ramachandra <artagnon@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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