mirror of
https://github.com/privatevoid-net/nix-super.git
synced 2024-09-21 08:58:04 +03:00
a5919f4754
Rather than using `/nix/var/nix/{profiles,gcroots}/per-user/`, put the user
profiles and gcroots under `$XDG_DATA_DIR/nix/{profiles,gcroots}`.
This means that the daemon no longer needs to manage these paths itself
(they are fully handled client-side). In particular, it doesn’t have to
`chown` them anymore (removing one need for root).
This does change the layout of the gc-roots created by nix-env, and is
likely to break some stuff, so I’m not sure how to properly handle that.
80 lines
2.4 KiB
C++
80 lines
2.4 KiB
C++
#pragma once
|
||
|
||
#include "types.hh"
|
||
#include "pathlocks.hh"
|
||
|
||
#include <time.h>
|
||
|
||
|
||
namespace nix {
|
||
|
||
class StorePath;
|
||
|
||
|
||
typedef uint64_t GenerationNumber;
|
||
|
||
struct Generation
|
||
{
|
||
GenerationNumber number;
|
||
Path path;
|
||
time_t creationTime;
|
||
};
|
||
|
||
typedef std::list<Generation> Generations;
|
||
|
||
|
||
/* Returns the list of currently present generations for the specified
|
||
profile, sorted by generation number. Also returns the number of
|
||
the current generation. */
|
||
std::pair<Generations, std::optional<GenerationNumber>> findGenerations(Path profile);
|
||
|
||
class LocalFSStore;
|
||
|
||
Path createGeneration(ref<LocalFSStore> store, Path profile, StorePath outPath);
|
||
|
||
void deleteGeneration(const Path & profile, GenerationNumber gen);
|
||
|
||
void deleteGenerations(const Path & profile, const std::set<GenerationNumber> & gensToDelete, bool dryRun);
|
||
|
||
void deleteGenerationsGreaterThan(const Path & profile, GenerationNumber 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, std::string_view timeSpec, bool dryRun);
|
||
|
||
void switchLink(Path link, Path target);
|
||
|
||
/* Roll back a profile to the specified generation, or to the most
|
||
recent one older than the current. */
|
||
void switchGeneration(
|
||
const Path & profile,
|
||
std::optional<GenerationNumber> dstGen,
|
||
bool dryRun);
|
||
|
||
/* 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. */
|
||
std::string optimisticLockProfile(const Path & profile);
|
||
|
||
/* Creates and returns the path to a directory suitable for storing the user’s
|
||
profiles. */
|
||
Path profilesDir();
|
||
|
||
/* Resolve ~/.nix-profile. If ~/.nix-profile doesn't exist yet, create
|
||
it. */
|
||
Path getDefaultProfile();
|
||
|
||
}
|