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* Lock the Nix store during upgrades.

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This commit is contained in:
Eelco Dolstra 2008-03-08 23:47:05 +00:00
parent 4df6dc28c3
commit 341b2de643
5 changed files with 53 additions and 26 deletions
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12
src/libstore/upgrade-schema.cc
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@ -3,6 +3,7 @@
#include "util.hh"
#include "local-store.hh"
#include "globals.hh"
#include "pathlocks.hh"
#include <iostream>
@ -18,8 +19,15 @@ Hash parseHashField(const Path & path, const string & s);
meta-information in files. */
void LocalStore::upgradeStore12()
{
if (!lockFile(globalLock, ltWrite, false)) {
printMsg(lvlError, "waiting for exclusive access to the Nix store...");
lockFile(globalLock, ltWrite, true);
}
printMsg(lvlError, "upgrading Nix store to new schema (this may take a while)...");
if (getSchema() >= nixSchemaVersion) return; /* somebody else beat us to it */
/* Open the old Nix database and tables. */
Database nixDB;
nixDB.open(nixDBPath);
@ -76,6 +84,10 @@ void LocalStore::upgradeStore12()
}
std::cerr << std::endl;
writeFile(schemaPath, (format("%1%") % nixSchemaVersion).str());
lockFile(globalLock, ltRead, true);
}