From 651ab439cf5b0c6ab2044257a30b0d94406d57d3 Mon Sep 17 00:00:00 2001 From: Eelco Dolstra Date: Thu, 16 Feb 2006 13:19:15 +0000 Subject: * A simple hack to fix NIX-18: the garbage collector cannot run when the disk is full (because to delete something from the Nix store, we need a Berkeley DB transaction, which takes up disk space). Under normal operation, we make sure that there exists a file /nix/var/nix/db/reserved of 1 MB. When running the garbage collector, we delete that file before we open the Berkeley DB environment. --- src/libstore/store.cc | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) (limited to 'src/libstore/store.cc') diff --git a/src/libstore/store.cc b/src/libstore/store.cc index 9c68c3392b4f..25e2d6e36009 100644 --- a/src/libstore/store.cc +++ b/src/libstore/store.cc @@ -76,10 +76,24 @@ static void upgradeStore07(); static void upgradeStore09(); -void openDB() +void openDB(bool reserveSpace) { if (readOnlyMode) return; + try { + Path reservedPath = nixDBPath + "/reserved"; + off_t reservedSize = 1024 * 1024; + if (reserveSpace) { + struct stat st; + if (stat(reservedPath.c_str(), &st) == -1 || + st.st_size != reservedSize) + writeFile(reservedPath, string(1024 * 1024, 'X')); + } + else + deletePath(reservedPath); + } catch (SysError & e) { /* don't care about errors */ + } + try { nixDB.open(nixDBPath); } catch (DbNoPermission & e) { -- cgit 1.4.1