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nix-env: Add support for --delete-generations 15d

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It will delete all generations older than the specified number of days.
This commit is contained in:
Ricardo M. Correia 2014-03-11 21:47:21 +01:00 committed by Eelco Dolstra
parent 59c9019685
commit 7ef7597f71
2 changed files with 24 additions and 5 deletions
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10
doc/manual/nix-env.xml
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@ -1167,10 +1167,12 @@ $ nix-env --list-generations
<refsection><title>Description</title>
<para>This operation deletes the specified generations of the current
profile. The generations can be a list of generation numbers, or the
profile. The generations can be a list of generation numbers, the
special value <literal>old</literal> to delete all non-current
generations. Periodically deleting old generations is important to
make garbage collection effective.</para>
generations, or a value such as <literal>30d</literal> to delete all
non-current generations older than the specified number of days.
Periodically deleting old generations is important to make garbage
collection effective.</para>
</refsection>
@ -1179,6 +1181,8 @@ make garbage collection effective.</para>
<screen>
$ nix-env --delete-generations 3 4 8
$ nix-env --delete-generations 30d
$ nix-env -p other_profile --delete-generations old</screen>
</refsection>

19
src/nix-env/nix-env.cc
View file

@ -1304,9 +1304,24 @@ static void opDeleteGenerations(Globals & globals,
for (Generations::iterator j = gens.begin(); j != gens.end(); ++j)
if (j->number != curGen)
deleteGeneration2(globals, j->number);
}
} else if (i->size() >= 2 && tolower(*i->rbegin()) == 'd') {
time_t curTime = time(NULL);
time_t oldTime;
string strDays = string(*i, 0, i->size() - 1);
int days;
else {
if (!string2Int(strDays, days) || days < 1)
throw UsageError(format("invalid number of days specifier `%1%'") % *i);
oldTime = curTime - days * 24 * 3600;
for (Generations::iterator j = gens.begin(); j != gens.end(); ++j) {
if (j->number == curGen) continue;
if (j->creationTime < oldTime)
deleteGeneration2(globals, j->number);
}
} else {
int n;
if (!string2Int(*i, n) || n < 0)
throw UsageError(format("invalid generation specifier `%1%'") % *i);