From eb233e728f06ec2b5cbcfc85059fa91a1150f291 Mon Sep 17 00:00:00 2001 From: Eelco Dolstra Date: Wed, 25 Aug 2004 16:54:08 +0000 Subject: * `--min-age' flag in nix-store and nix-collect-garbage to only delete unreachable paths that haven't been used for N hours. For instance, `nix-collect-garbage --min-age 168' only deletes paths that haven't been accessed in the last week. This is useful for instance in the build farm where many derivations can be shared between consecutive builds, and we wouldn't want a garbage collect to throw them all away. We could of course register them as roots, but then we'd to unregister them at some point, which would be a pain to manage. The `--min-age' flag gives us a sort of MRU caching scheme. BUG: this really shouldn't be in gc.cc since that violates mechanism/policy separation. --- src/libstore/gc.cc | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-) (limited to 'src/libstore/gc.cc') diff --git a/src/libstore/gc.cc b/src/libstore/gc.cc index aed7c2294..9af957693 100644 --- a/src/libstore/gc.cc +++ b/src/libstore/gc.cc @@ -2,6 +2,11 @@ #include "globals.hh" +#include +#include +#include + + void followLivePaths(Path nePath, PathSet & live) { /* Just to be sure, canonicalise the path. It is important to do @@ -62,16 +67,26 @@ PathSet findLivePaths(const Paths & roots) } -PathSet findDeadPaths(const PathSet & live) +PathSet findDeadPaths(const PathSet & live, time_t minAge) { PathSet dead; startNest(nest, lvlDebug, "finding dead paths"); + time_t now = time(0); + Strings storeNames = readDirectory(nixStore); for (Strings::iterator i = storeNames.begin(); i != storeNames.end(); ++i) { Path p = canonPath(nixStore + "/" + *i); + + if (minAge > 0) { + struct stat st; + if (lstat(p.c_str(), &st) != 0) + throw SysError(format("obtaining information about `%1%'") % p); + if (st.st_atime + minAge >= now) continue; + } + if (live.find(p) == live.end()) { debug(format("dead path `%1%'") % p); dead.insert(p); -- cgit v1.2.3