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Merge pull request #767 from mogorman/garbage_collect_keep_last_few

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Implement --delete-generations + flag for keeping last N number of gens
This commit is contained in:
Peter Simons 2018-05-31 10:00:21 +02:00 • committed by GitHub
commit 93aa3bea2e
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4 changed files with 42 additions and 6 deletions
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23
src/libstore/profiles.cc
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@ -157,6 +157,29 @@ void deleteGenerations(const Path & profile, const std::set<unsigned int> & gens
}
}
void deleteGenerationsGreaterThan(const Path & profile, int max, bool dryRun)
{
PathLocks lock;
lockProfile(lock, profile);
int curGen;
bool fromCurGen = false;
Generations gens = findGenerations(profile, curGen);
for (auto i = gens.rbegin(); i != gens.rend(); ++i) {
if (i->number == curGen) {
fromCurGen = true;
max--;
continue;
}
if (fromCurGen) {
if (max) {
max--;
continue;
}
deleteGeneration2(profile, i->number, dryRun);
}
}
}
void deleteOldGenerations(const Path & profile, bool dryRun)
{

2
src/libstore/profiles.hh
View file

@ -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 int max, bool dryRun);
void deleteOldGenerations(const Path & profile, bool dryRun);
void deleteGenerationsOlderThan(const Path & profile, time_t t, bool dryRun);

8
src/nix-env/nix-env.cc
View file

@ -1284,6 +1284,14 @@ 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) {
if(opArgs.front().size() < 2)
throw Error(format("invalid number of generations ‘%1%’") % opArgs.front());
string str_max = string(opArgs.front(), 1, opArgs.front().size());
int max;
if (!string2Int(str_max, max) || max == 0)
throw Error(format("invalid number of generations to keep ‘%1%’") % opArgs.front());
deleteGenerationsGreaterThan(globals.profile, max, globals.dryRun);
} else {
std::set<unsigned int> gens;
for (auto & i : opArgs) {