68 lines
1.9 KiB
C++
68 lines
1.9 KiB
C++
#pragma once
|
|
|
|
#include "types.hh"
|
|
#include "pathlocks.hh"
|
|
|
|
#include <time.h>
|
|
|
|
|
|
namespace nix {
|
|
|
|
|
|
struct Generation
|
|
{
|
|
int number;
|
|
Path path;
|
|
time_t creationTime;
|
|
Generation()
|
|
{
|
|
number = -1;
|
|
}
|
|
operator bool() const
|
|
{
|
|
return number != -1;
|
|
}
|
|
};
|
|
|
|
typedef list<Generation> Generations;
|
|
|
|
|
|
/* Returns the list of currently present generations for the specified
|
|
profile, sorted by generation number. */
|
|
Generations findGenerations(Path profile, int & curGen);
|
|
|
|
class LocalFSStore;
|
|
|
|
Path createGeneration(ref<LocalFSStore> store, Path profile, Path outPath);
|
|
|
|
void deleteGeneration(const Path & profile, unsigned int gen);
|
|
|
|
void deleteGenerations(const Path & profile, const std::set<unsigned int> & gensToDelete, bool dryRun);
|
|
|
|
void deleteGenerationsGreaterThan(const Path & profile, const int max, bool dryRun);
|
|
|
|
void deleteOldGenerations(const Path & profile, bool dryRun);
|
|
|
|
void deleteGenerationsOlderThan(const Path & profile, time_t t, bool dryRun);
|
|
|
|
void deleteGenerationsOlderThan(const Path & profile, const string & timeSpec, bool dryRun);
|
|
|
|
void switchLink(Path link, Path target);
|
|
|
|
/* Ensure exclusive access to a profile. Any command that modifies
|
|
the profile first acquires this lock. */
|
|
void lockProfile(PathLocks & lock, const Path & profile);
|
|
|
|
/* Optimistic locking is used by long-running operations like `nix-env
|
|
-i'. Instead of acquiring the exclusive lock for the entire
|
|
duration of the operation, we just perform the operation
|
|
optimistically (without an exclusive lock), and check at the end
|
|
whether the profile changed while we were busy (i.e., the symlink
|
|
target changed). If so, the operation is restarted. Restarting is
|
|
generally cheap, since the build results are still in the Nix
|
|
store. Most of the time, only the user environment has to be
|
|
rebuilt. */
|
|
string optimisticLockProfile(const Path & profile);
|
|
|
|
}
|