When using the rsync:// protocol, duplicity expects to find the rsync binary in the path.
Without rsync in the path, duplicity fails with the following error
Attempt 1 failed. AttributeError: 'NoneType' object has no attribute 'rfind'
Adding rsync to the path enables the rsync:// protocol to work correctly.
This patch makes two changes.
(1) It memoizes the computation of dependsOnOld.
(2) It replaces rewrittenDerivations with a similar memoized table rewriteMemo.
This prevents the entire tree of run-time dependencies from being traversed and instead only traverses the graph of run-time dependencies.
In the case of deep dependency changes (such as changing one's bash version for an entire NixOS system) this can lead to an exponential speedup in processing time
because shared dependencies are no longer traversed multiple times.
This patch isn't quite derivation-per-derivation equivalent to the original computation.
There are two immaterial differences.
(1) The previous version would always call upon sed to replace oldDependency with newDependency even when the store object being updated doesn't directly depend on
oldDependency.
The new version only replaceds oldDependency with newDependency when the store object being updated actually directly depends on oldDependency (which means there is
actually a hash to replace).
(2) The previous version would list the old store object as a source input of the new store object, *except* for the root derivation being updated. Because the
root derivation being updated has its actual derivation avaiable the previous verions would make the updated root derivation depend on the old derivation as a
derivation input instead of a source input.
The new version always lists the old store object as a source input, including the root derivation.
Now that both self and super are available to prefFun, we can use self, where appropriate to access late bound versions of most
packages.
When extensions are not used, there is no difference between self and super.
The existing knot-tying code I felt was a bit incoherent with result, finalReturn, self, refering to different various forms of the "haskellPackages" value and often
different forms in the same place.
This commit instills some object-oriented discipline to the construction of hasekllPackages using a small number of fundamental OO concepts:
* An class is a open recursive function of the form (self : fooBody) where fooBody is a set.
* An instance of a class is the fixed point of the class.
This value is sometimes refered to as an object and the values in the resulting set are sometimes refered to as methods.
* A class, foo = self : fooBody, can be extended by an extension which is a function bar = (self : super : barBody) where barBody a set of overrides for fooBody.
The result of a class extension is a new class whose value is self : foo self // bar self (foo self).
The super parameter gives access to the original methods that barBody may be overriding.
This commit turns the haskell-packages value into a "class".
The knot-tying, a.k.a the object instanitation, is moved into haskells-defaults. The "finalReturn" is no longer needed and is eliminated from the body of
haskell-packages. All the work done by prefFun is moved to haskell-defaults, so that parameter is eliminated form haskell-packages. Notice that the old prefFun took
two pameters named "self" and "super", but both parameters got passed the same value "result". There seems to have been some confusion in the old code.
Inside haskell-defaults, the haskell-packages class is extended twice before instantiation. The first extension is done using prefFun argument.
The second extension is done the extension argument, which is a renamed version of extraPrefs.
This two stage approach means that extension's super gets access to the post "perfFun" object while previously the extraPrefs only had access to the pre "prefFun"
object. Also the extension function has access to both the super (post "perfFun") object and to self, the final object. With extraPrefs, one needed to use the
"finalReturn" of the haskell packages to get access to the final object. Due to significant changes in semantics, I thought it best to replace extraPrefs with
extension so that people using extraPrefs know to update thier cod.
Lastly, all the Prefs functions have renamed the "self" parameter to "super". This is because "self" was never actually a self-reference in the object oriented sense
of the word. For example
Cabal_1_18_1_3 = self.Cabal_1_18_1_3.override { deepseq = self.deepseq_1_3_0_2; };
doesn't actually make sense from an object oriented standpoint because, barring further method overriding, the value of Cabal_1_18_1_3 would be trying to override it's
own value which simply causes a loop exception. Thankfully all these uses of self were really uses of super:
Cabal_1_18_1_3 = super.Cabal_1_18_1_3.override { deepseq = super.deepseq_1_3_0_2; };
In this notation the overriden Cabal_1_18_1_3 method calls the Cabal_1_18_1_3 of the super-class, which is a well-founded notion.
Below is an example use of using "extension" parameter
{
packageOverrides = pkgs : {
testHaskellPackages = pkgs.haskellPackages.override {
extension = self : super : {
transformers_0_4_1_0 = self.cabal.mkDerivation (pkgs: {
pname = "transformers";
version = "0.4.1.0";
sha256 = "0jlnz86f87jndv4sifg1zpv5b2g2cxy1x2575x727az6vyaarwwg";
meta = {
description = "Concrete functor and monad transformers";
license = pkgs.stdenv.lib.licenses.bsd3;
platforms = pkgs.ghc.meta.platforms;
maintainers = [ pkgs.stdenv.lib.maintainers.andres ];
};
});
transformers = self.transformers_0_4_1_0;
lensFamilyCore = super.lensFamilyCore.override { transformers = self.transformers_0_3_0_0; };
};
};
};
}
Notice the use of self in the body of the override of the transformers method which references the newly defined transformers_0_4_1_0 method.
With the previous code, one would have to instead akwardly write
transformers = super.finalReturn.transformers_0_4_1_0;
or use a rec clause, which would prevent futher overriding of transformers_0_4_1_0.
Markus Mottl <markus.mottl@gmail.com> said by email to me that
``Note that this link is served by a Mercurial Apache module, i.e. this
is not static content. It's likely that e.g. tar or bzip2 produce
slightly different output, which would explain changing hashes.
So I guess we shouldn't worry too much about the change in hash?
svn path=/nixpkgs/trunk/; revision=33419
matita and ulex must build against the same version of camlp5, so in an attempt to force them to always be the same I am adding a propgatedBuildInput to ulex.
Granted Matita still requires camlp5_traditional and this is less obvious in the matita file now, so I am not entirely sure this is the right design choice.
svn path=/nixpkgs/trunk/; revision=30552
But it doesn't compile optimized bytecode. :( I would be good if someone who actually knew python could give this package some love.
svn path=/nixpkgs/trunk/; revision=26742
Haddock calls directly into ghclib by passing our carefully crafted ghc-wrapper.
This means that haddock needs to be wrapped itself, which this patch does.
svn path=/nixpkgs/trunk/; revision=24716
The wrapper script works by creating an image of the distribution in the users home directory
(defaulting to $HOME/.config/df_linux). This is done because the program expects to write
state into it's own distribution.
Better ideas are welcome!
What further is needed is to allow users to configure the init. One way is to use nix-config
to apply patches to the init.txt file, though this would break sharing of the package between
different users.
svn path=/nixpkgs/trunk/; revision=24538
Russell O'Connor