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* Nix-store queries --references' and referers' to query the pointer

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graph.  That is, `nix-store --query --references PATH' shows the set
  of paths referenced by PATH, and `nix-store --query --referers PATH'
  shows the set of paths referencing PATH.
This commit is contained in:
Eelco Dolstra 2005-01-19 16:59:56 +00:00
parent 96de272b48
commit e0f4e587c3
3 changed files with 33 additions and 18 deletions
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10
src/libstore/store.cc
View file

@ -272,6 +272,16 @@ void queryReferences(const Path & storePath, PathSet & references)
}
void queryReferers(const Path & storePath, PathSet & referers)
{
Paths referers2;
if (!isValidPath(storePath))
throw Error(format("path `%1%' is not valid") % storePath);
nixDB.queryStrings(noTxn, dbReferers, storePath, referers2);
referers.insert(referers2.begin(), referers2.end());
}
static Substitutes readSubstitutes(const Transaction & txn,
const Path & srcPath)
{

4
src/libstore/store.hh
View file

@ -84,6 +84,10 @@ void setReferences(const Transaction & txn, const Path & storePath,
result is not cleared. */
void queryReferences(const Path & storePath, PathSet & references);
/* Queries the set of incoming FS references for a store path. The
result is not cleared. */
void queryReferers(const Path & storePath, PathSet & referers);
/* Constructs a unique store path name. */
Path makeStorePath(const string & type,
const Hash & hash, const string & suffix);