From e0f4e587c3a5110f57fbf4e85e14fdc606b1eaf6 Mon Sep 17 00:00:00 2001 From: Eelco Dolstra Date: Wed, 19 Jan 2005 16:59:56 +0000 Subject: * Nix-store queries `--references' and `referers' to query the pointer 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. --- src/libstore/store.cc | 10 ++++++++++ src/libstore/store.hh | 4 ++++ 2 files changed, 14 insertions(+) (limited to 'src/libstore') diff --git a/src/libstore/store.cc b/src/libstore/store.cc index 49a9d2734..631984784 100644 --- a/src/libstore/store.cc +++ b/src/libstore/store.cc @@ -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) { diff --git a/src/libstore/store.hh b/src/libstore/store.hh index 239493a88..8f5190f80 100644 --- a/src/libstore/store.hh +++ b/src/libstore/store.hh @@ -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); -- cgit v1.2.3