tvl-depot/src/libexpr/get-drvs.hh
Eelco Dolstra a9d15d4f43 * nix-env -i: instead of breaking package ties by version, break them
by priority and version install.  That is, if there are multiple
  packages with the same name, then pick the package with the highest
  priority, and only use the version if there are multiple packages
  with the same priority.

  This makes it possible to mark specific versions/variant in Nixpkgs
  more or less desirable than others.  A typical example would be a
  beta version of some package (e.g., "gcc-4.2.0rc1") which should not
  be installed even though it is the highest version, except when it
  is explicitly selected (e.g., "nix-env -i gcc-4.2.0rc1").

* Idem for nix-env -u, only the semantics are a bit trickier since we
  also need to take into account the priority of the currently
  installed package (we never upgrade to a lower priority, unless
  --always is given).
2007-05-01 20:33:18 +00:00

68 lines
1.4 KiB
C++

#ifndef __GET_DRVS_H
#define __GET_DRVS_H
#include <string>
#include <map>
#include <boost/shared_ptr.hpp>
#include "eval.hh"
namespace nix {
typedef std::map<string, string> MetaInfo;
struct DrvInfo
{
private:
string drvPath;
string outPath;
public:
string name;
string attrPath; /* path towards the derivation */
string system;
/* !!! these should really be hidden, and setMetaInfo() should
make a copy since the ATermMap can be shared between multiple
DrvInfos. */
boost::shared_ptr<ATermMap> attrs;
string queryDrvPath(EvalState & state) const;
string queryOutPath(EvalState & state) const;
MetaInfo queryMetaInfo(EvalState & state) const;
string queryMetaInfo(EvalState & state, const string & name) const;
void setDrvPath(const string & s)
{
drvPath = s;
}
void setOutPath(const string & s)
{
outPath = s;
}
void setMetaInfo(const MetaInfo & meta);
};
typedef list<DrvInfo> DrvInfos;
/* Evaluate expression `e'. If it evaluates to a derivation, store
information about the derivation in `drv' and return true.
Otherwise, return false. */
bool getDerivation(EvalState & state, Expr e, DrvInfo & drv);
void getDerivations(EvalState & state, Expr e, const string & pathPrefix,
const ATermMap & autoArgs, DrvInfos & drvs);
}
#endif /* !__GET_DRVS_H */