From 817562e6946fa44c253beb76a36d85b55fd9c14d Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <edolstra@gmail.com>
Date: Tue, 14 Sep 2021 19:05:28 +0200
Subject: Add "nix profile rollback" command

---
 src/nix-env/nix-env.cc | 35 ++---------------------------------
 1 file changed, 2 insertions(+), 33 deletions(-)

(limited to 'src/nix-env')

diff --git a/src/nix-env/nix-env.cc b/src/nix-env/nix-env.cc
index e04954d45..20bbc2064 100644
--- a/src/nix-env/nix-env.cc
+++ b/src/nix-env/nix-env.cc
@@ -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);
 }
 
 
-- 
cgit v1.2.3


From 229ad612b8d678deee6c5077ff5a5f0b0085bd9e Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <edolstra@gmail.com>
Date: Tue, 14 Sep 2021 19:48:16 +0200
Subject: Fix quotes

---
 src/nix-env/nix-env.cc | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

(limited to 'src/nix-env')

diff --git a/src/nix-env/nix-env.cc b/src/nix-env/nix-env.cc
index 20bbc2064..a86f55f84 100644
--- a/src/nix-env/nix-env.cc
+++ b/src/nix-env/nix-env.cc
@@ -1265,12 +1265,12 @@ static void opDeleteGenerations(Globals & globals, Strings opFlags, Strings opAr
     } else if (opArgs.size() == 1 && opArgs.front().find('d') != string::npos) {
         deleteGenerationsOlderThan(globals.profile, opArgs.front(), globals.dryRun);
     } else if (opArgs.size() == 1 && opArgs.front().find('+') != string::npos) {
-        if(opArgs.front().size() < 2)
-            throw Error("invalid number of generations ‘%1%’", opArgs.front());
+        if (opArgs.front().size() < 2)
+            throw Error("invalid number of generations '%1%'", opArgs.front());
         string str_max = string(opArgs.front(), 1, opArgs.front().size());
         auto max = string2Int<GenerationNumber>(str_max);
         if (!max || *max == 0)
-            throw Error("invalid number of generations to keep ‘%1%’", opArgs.front());
+            throw Error("invalid number of generations to keep '%1%'", opArgs.front());
         deleteGenerationsGreaterThan(globals.profile, *max, globals.dryRun);
     } else {
         std::set<GenerationNumber> gens;
-- 
cgit v1.2.3