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Add "nix profile rollback" command

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This commit is contained in:
Eelco Dolstra 2021-09-14 19:05:28 +02:00
parent 1fbaf36729
commit 817562e694
6 changed files with 108 additions and 34 deletions
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35
src/nix-env/nix-env.cc
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@ -1204,37 +1204,6 @@ static void opSwitchProfile(Globals & globals, Strings opFlags, Strings opArgs)
}
static constexpr GenerationNumber prevGen = std::numeric_limits<GenerationNumber>::max();
static void switchGeneration(Globals & globals, GenerationNumber dstGen)
{
PathLocks lock;
lockProfile(lock, globals.profile);
auto [gens, curGen] = findGenerations(globals.profile);
std::optional<Generation> dst;
for (auto & i : gens)
if ((dstGen == prevGen && i.number < curGen) ||
(dstGen >= 0 && i.number == dstGen))
dst = i;
if (!dst) {
if (dstGen == prevGen)
throw Error("no generation older than the current (%1%) exists", curGen.value_or(0));
else
throw Error("generation %1% does not exist", dstGen);
}
printInfo("switching from generation %1% to %2%", curGen.value_or(0), dst->number);
if (globals.dryRun) return;
switchLink(globals.profile, dst->path);
}
static void opSwitchGeneration(Globals & globals, Strings opFlags, Strings opArgs)
{
if (opFlags.size() > 0)
@ -1243,7 +1212,7 @@ static void opSwitchGeneration(Globals & globals, Strings opFlags, Strings opArg
throw UsageError("exactly one argument expected");
if (auto dstGen = string2Int<GenerationNumber>(opArgs.front()))
switchGeneration(globals, *dstGen);
switchGeneration(globals.profile, *dstGen, globals.dryRun);
else
throw UsageError("expected a generation number");
}
@ -1256,7 +1225,7 @@ static void opRollback(Globals & globals, Strings opFlags, Strings opArgs)
if (opArgs.size() != 0)
throw UsageError("no arguments expected");
switchGeneration(globals, prevGen);
switchGeneration(globals.profile, {}, globals.dryRun);
}