Old implementation of the local resolver did not copy directory if it
was writable. This optimization can lead to some potential problems if
the directory is writable, but its subdirectories aren't.
New implementation of the local resolver does not have this
optimization and it always copies the directory into staging area.
All subversion URIs have to be prefixed with 'svn:' to separate them
from URIs for other resolvers. For example, 'svn:https://server/repo'
can now be used.
All mercurial URIs have to be prefixed with 'hg:' to separate them
from URIs for other resolvers. For example,
'hg:https://server/user/repo' can now be used.
Non-standard git URIs are ones that do not start with 'git:' nor end
with '.git'. An example of non-standard git URI is
'ssh://server/home/user/repo'.
The mechanism for specifying a non-standard git URI is done by
prefixing the whole URI with 'git:' to signify that it should be
handled with the git resolver. For example, non-standard git URIs like
'git:ssh://server/user/repo' and 'git:https://server/user/repo' can
now be used.
Instead of cloning from a remote git repository for each branch,
revision or tag separately, the git resolver locally clones only once
the remote git repository and then creates further local clones from
this local copy of the remote repository.
First, optimization, of course, is execution speed, because cloning
local repository is much faster than remote repository. Furthermore,
because git uses hard-linking when a clone of local repository is
created, the second optimization is in space consumption.
For example, if we have one project that uses
https://github.com/harrah/xsbt.git#v0.11.1 and second project that
uses https://github.com/harrah/xsbt.git#v0.11.2, in previous git
resolver implementation it would require two separate clones of the
remote git repository at https://github.com/harrah/xsbt.git. But, the
new git resolver requires only one clone of the remote git repository
and two local clones which take no space because of hard-linking.
Eugene Vigdorchik
Mark Harrah
Sanjin Sehic