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* Get rid of the substitutes database table (NIX-47). Instead, if we

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need any info on substitutable paths, we just call the substituters
  (such as download-using-manifests.pl) directly.  This means that
  it's no longer necessary for nix-pull to register substitutes or for
  nix-channel to clear them, which makes those operations much faster
  (NIX-95).  Also, we don't have to worry about keeping nix-pull
  manifests (in /nix/var/nix/manifests) and the database in sync with
  each other.

  The downside is that there is some overhead in calling an external
  program to get the substitutes info.  For instance, "nix-env -qas"
  takes a bit longer.

  Abolishing the substitutes table also makes the logic in
  local-store.cc simpler, as we don't need to store info for invalid
  paths.  On the downside, you cannot do things like "nix-store -qR"
  on a substitutable but invalid path (but nobody did that anyway).

* Never catch interrupts (the Interrupted exception).
This commit is contained in:
Eelco Dolstra 2007-08-12 00:29:28 +00:00
parent 4695f4edd6
commit 9e975458b4
24 changed files with 357 additions and 469 deletions
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26
src/libutil/types.hh
View file

@ -19,23 +19,18 @@ using std::vector;
using boost::format;
class Error : public std::exception
/* BaseError should generally not be caught, as it has Interrupted as
a subclass. Catch Error instead. */
class BaseError : public std::exception
{
protected:
string err;
public:
Error(const format & f);
~Error() throw () { };
BaseError(const format & f);
~BaseError() throw () { };
const char * what() const throw () { return err.c_str(); }
const string & msg() const throw () { return err; }
Error & addPrefix(const format & f);
};
class SysError : public Error
{
public:
int errNo;
SysError(const format & f);
BaseError & addPrefix(const format & f);
};
#define MakeError(newClass, superClass) \
@ -45,6 +40,15 @@ public:
newClass(const format & f) : superClass(f) { }; \
};
MakeError(Error, BaseError)
class SysError : public Error
{
public:
int errNo;
SysError(const format & f);
};
typedef list<string> Strings;
typedef set<string> StringSet;