Mercurial > hg > mercurial-crew-with-dirclash
view mercurial/repo.py @ 5369:7530334bf301
revlog: generate trivial deltas against null revision
To avoid extra memory usage and performance issues with large files,
generate a trivial delta header for deltas against the null revision
rather than calling the usual delta generator.
We append the delta header to meta rather than prepending it to data
to avoid a large allocate and copy.
author | Matt Mackall <mpm@selenic.com> |
---|---|
date | Wed, 03 Oct 2007 17:17:27 -0500 |
parents | 65dc707606ed |
children | 08d6e8754388 |
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# repo.py - repository base classes for mercurial # # Copyright 2005, 2006 Matt Mackall <mpm@selenic.com> # Copyright 2006 Vadim Gelfer <vadim.gelfer@gmail.com> # # This software may be used and distributed according to the terms # of the GNU General Public License, incorporated herein by reference. class RepoError(Exception): pass class NoCapability(RepoError): pass class repository(object): def capable(self, name): '''tell whether repo supports named capability. return False if not supported. if boolean capability, return True. if string capability, return string.''' if name in self.capabilities: return True name_eq = name + '=' for cap in self.capabilities: if cap.startswith(name_eq): return cap[len(name_eq):] return False def requirecap(self, name, purpose): '''raise an exception if the given capability is not present''' if not self.capable(name): raise NoCapability(_('cannot %s; remote repository does not ' 'support the %r capability') % (purpose, name))