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Implement --delete-generations + flag for keeping last N number of generations

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This commit is contained in:
Matthew O'Gorman 2016-01-06 20:15:19 -05:00
parent 4a000cbb39
commit 429154b74c
4 changed files with 32 additions and 2 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, 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)
{

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

2
src/nix-env/nix-env.cc
View file

@ -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) {