lfs: verify lfs object content when transferring to and from the remote store
This avoids inserting corrupt files into the usercache, and local and remote
stores. One down side is that the bad file won't be available locally for
forensic purposes after a remote download. I'm thinking about adding an
'incoming' directory to the local lfs store to handle the download, and then
move it to the 'objects' directory after it passes verification. That would
have the additional benefit of not concatenating each transfer chunk in memory
until the full file is transferred.
Verification isn't needed when the data is passed back through the revlog
interface or when the oid was just calculated, but otherwise it is on by
default. The additional overhead should be well worth avoiding problems with
file based remote stores, or buggy lfs servers.
Having two different verify functions is a little sad, but the full data of the
blob is mostly passed around in memory, because that's what the revlog interface
wants. The upload function, however, chunks up the data. It would be ideal if
that was how the content is always handled, but that's probably a huge project.
I don't really like printing the long hash, but `hg debugdata` isn't a public
interface, and is the only way to get it. The filelog and revision info is
nowhere near this area, so recommending `hg verify` is the easiest thing to do.
# An example WSGI for use with mod_wsgi, edit as necessary
# See https://mercurial-scm.org/wiki/modwsgi for more information
# Path to repo or hgweb config to serve (see 'hg help hgweb')
config = "/path/to/repo/or/config"
# Uncomment and adjust if Mercurial is not installed system-wide
# (consult "installed modules" path from 'hg debuginstall'):
#import sys; sys.path.insert(0, "/path/to/python/lib")
# Uncomment to send python tracebacks to the browser if an error occurs:
#import cgitb; cgitb.enable()
# enable demandloading to reduce startup time
from mercurial import demandimport; demandimport.enable()
from mercurial.hgweb import hgweb
application = hgweb(config)