use posix compliant option for head head -N is not posix compliant, head -n N should be used instead

Merge with upstream

Added hg-ssh - a wrapper for ssh access to a limited set of mercurial repos To be used in ~/.ssh/authorized_keys with the "command" option, see sshd(8): command="hg-ssh path/to/repo1 /path/to/repo2 ~/repo3 ~user/repo4" ssh-dss ... (probably together with these other useful options: no-port-forwarding,no-X11-forwarding,no-agent-forwarding) This allows pull/push over ssh to to the repositories given as arguments. If all your repositories are subdirectories of a common directory, you can allow shorter paths with: command="cd path/to/my/repositories && hg-ssh repo1 subdir/repo2"

Catch the exception raised with 'hg help <somethingambiguous>'. Example: 'hg help a'

Add revlog.strip to truncate away revisions. This updates the revlog data structures for index and nodemap in place so the .d and .i files don't need to be reread after stripping away a revision.

Optimize manifest.add Testing shows that manifest.add is spending a significant percentage of its time running calcoffsets and doing text = "".join(addlist). This patch removes the need for both of these by storying the manifest in a character array, and using a modified bisect search to find lines without the help of a separate index of line offsets. manifest.add was also reworked to push delta construction/combination into the main loop. Time to apply 2751 patches (without psyco, ext3 noatime,data=writeback): Stock hg: 4m45s real 3m32s user 55s sys patched: 2m48s real 1m53s user 43s sys quilt: 2m30s real 45s user 50s sys (quilt does much more io...)

Reduce string duplication in compression code This cuts down on string copies and allows buffers (instead of strings) to be passed into the compression code

reset mtime when two files are equal

add localrepo.wlock for protecting the dirstate - add localrepo.wlock - nest it in localrepo.lock - protect the code that change the dirstate

add a releasefn keyword to lock.lock releasefn is a function that will be executed when the lock is released

add dirstate.lazyread, write atomically the dirstate - add a dirstate.lazyread function that read only if it wasn't read before and update all callers - use the atomic keyword from util.opener to atomically write the dirstate mercurial/dirstate.py

add an atomic argument to util.opener when atomic is used, the file while be renamed on close