diff options
| -rw-r--r-- | doc/manual/command-ref/nix-env.xml | 7 | ||||
| -rw-r--r-- | src/libstore/profiles.cc | 23 | ||||
| -rw-r--r-- | src/libstore/profiles.hh | 2 | ||||
| -rw-r--r-- | src/nix-env/nix-env.cc | 2 |
4 files changed, 32 insertions, 2 deletions
diff --git a/doc/manual/command-ref/nix-env.xml b/doc/manual/command-ref/nix-env.xml index d4563ac47551..f0e70a41c024 100644 --- a/doc/manual/command-ref/nix-env.xml +++ b/doc/manual/command-ref/nix-env.xml @@ -1346,9 +1346,10 @@ $ nix-env --list-generations <para>This operation deletes the specified generations of the current profile. The generations can be a list of generation numbers, the special value <literal>old</literal> to delete all non-current -generations, or a value such as <literal>30d</literal> to delete all +generations, a value such as <literal>30d</literal> to delete all generations older than the specified number of days (except for the -generation that was active at that point in time). +generation that was active at that point in time), or a value such as. +<literal>+5</literal> to delete all but the number of items specified. Periodically deleting old generations is important to make garbage collection effective.</para> @@ -1359,6 +1360,8 @@ collection effective.</para> <screen> $ nix-env --delete-generations 3 4 8 +$ nix-env --delete-generations +5 + $ nix-env --delete-generations 30d $ nix-env -p other_profile --delete-generations old</screen> diff --git a/src/libstore/profiles.cc b/src/libstore/profiles.cc index 4a607b584506..e6300cf05552 100644 --- a/src/libstore/profiles.cc +++ b/src/libstore/profiles.cc @@ -157,6 +157,29 @@ void deleteGenerations(const Path & profile, const std::set<unsigned int> & gens } } +void deleteGenerationsGreaterThan(const Path & profile, const string & max, bool dryRun) +{ + int max_keep = 0; + PathLocks lock; + if(max.size() < 2) + throw Error(format("invalid number of generations ‘%1%’") % max); + string str_max = string(max, 1, max.size()); + if (!string2Int(str_max, max_keep) || max_keep == 0) + throw Error(format("invalid number of generations to keep ‘%1%’") % max); + + lockProfile(lock, profile); + + int curGen; + Generations gens = findGenerations(profile, curGen); + + for (auto i = gens.rbegin(); i != gens.rend(); ++i) { + if (max_keep) { + max_keep--; + continue; + } + deleteGeneration2(profile, i->number, dryRun); + } +} void deleteOldGenerations(const Path & profile, bool dryRun) { diff --git a/src/libstore/profiles.hh b/src/libstore/profiles.hh index 1d4e6d3037db..3cad08dc5265 100644 --- a/src/libstore/profiles.hh +++ b/src/libstore/profiles.hh @@ -39,6 +39,8 @@ 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 string & max, bool dryRun); + void deleteOldGenerations(const Path & profile, bool dryRun); void deleteGenerationsOlderThan(const Path & profile, time_t t, bool dryRun); diff --git a/src/nix-env/nix-env.cc b/src/nix-env/nix-env.cc index 97e66cbd937e..1440b7744fd6 100644 --- a/src/nix-env/nix-env.cc +++ b/src/nix-env/nix-env.cc @@ -1284,6 +1284,8 @@ static void opDeleteGenerations(Globals & globals, Strings opFlags, Strings opAr deleteOldGenerations(globals.profile, globals.dryRun); } 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) { + deleteGenerationsGreaterThan(globals.profile, opArgs.front(), globals.dryRun); } else { std::set<unsigned int> gens; for (auto & i : opArgs) { |