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only delete things older than current gen and update logic in doc as

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This commit is contained in:
Matthew O'Gorman 2018-03-01 22:59:00 -05:00
parent 3c16044cb0
commit 467fdd8ca4
2 changed files with 14 additions and 9 deletions
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6
doc/manual/command-ref/nix-env.xml
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@ -1349,9 +1349,9 @@ special value <literal>old</literal> to delete all non-current
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), 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>
<literal>+5</literal> to only keep the specified items older than the
current generation. Periodically deleting old generations is important
to make garbage collection effective.</para>
</refsection>

13
src/libstore/profiles.cc
View file

@ -160,19 +160,24 @@ 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 (max) {
if (i->number == curGen) {
fromCurGen = true;
max--;
continue;
}
if (i->number != curGen)
if (fromCurGen) {
if (max) {
max--;
continue;
}
deleteGeneration2(profile, i->number, dryRun);
}
}
}