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* Substitutes now should produce a path with the same id as they are

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substituting for (obvious, really).

* For greater efficiency, nix-pull/unnar will place the output in a
  path that is probably the same as what is actually needed, thus
  preventing a path copy.

* Even if a output id is given in a Fix package expression, ensure
  that the resulting Nix derive expression has a different id.  This
  is because Nix expressions that are semantically equivalent (i.e.,
  build the same result) might be different w.r.t. efficiency or
  divergence.  It is absolutely vital for the substitute mechanism
  that such expressions are not used interchangeably.
This commit is contained in:
Eelco Dolstra 2003-07-22 15:15:15 +00:00
parent df648c4967
commit e877c69d78
8 changed files with 86 additions and 50 deletions
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6
src/normalise.hh
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@ -5,11 +5,11 @@
/* Normalise an fstate-expression, that is, return an equivalent
Slice. */
Slice normaliseFState(FSId id);
Slice. (For the meaning of `pending', see expandId()). */
Slice normaliseFState(FSId id, FSIdSet pending = FSIdSet());
/* Realise a Slice in the file system. */
void realiseSlice(const Slice & slice);
void realiseSlice(const Slice & slice, FSIdSet pending = FSIdSet());
/* Get the list of root (output) paths of the given
fstate-expression. */