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* Operation `--delete-generations' to delete generations of a

Browse source 
profile.  Arguments are either generation number, or `old' to delete
  all non-current generations.  Typical use:

  $ nix-env --delete-generations old
  $ nix-collect-garbage

* istringstream -> string2Int.
This commit is contained in:
Eelco Dolstra 2004-09-10 13:32:08 +00:00
parent c16be6ac92
commit dcc433de47
8 changed files with 100 additions and 33 deletions
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49
src/nix-env/main.cc
View file

@ -643,10 +643,8 @@ static void opSwitchGeneration(Globals & globals,
if (opArgs.size() != 1)
throw UsageError(format("exactly one argument expected"));
istringstream str(opArgs.front());
int dstGen;
str >> dstGen;
if (!str || !str.eof())
if (!string2Int(opArgs.front(), dstGen))
throw UsageError(format("expected a generation number"));
switchGeneration(globals, dstGen);
@ -688,6 +686,49 @@ static void opListGenerations(Globals & globals,
}
static void deleteGeneration2(const Path & profile, unsigned int gen)
{
printMsg(lvlInfo, format("removing generation %1%") % gen);
deleteGeneration(profile, gen);
}
static void opDeleteGenerations(Globals & globals,
Strings opFlags, Strings opArgs)
{
if (opFlags.size() > 0)
throw UsageError(format("unknown flag `%1%'") % opFlags.front());
int curGen;
Generations gens = findGenerations(globals.profile, curGen);
for (Strings::iterator i = opArgs.begin(); i != opArgs.end(); ++i) {
if (*i == "old") {
for (Generations::iterator j = gens.begin(); j != gens.end(); ++j)
if (j->number != curGen)
deleteGeneration2(globals.profile, j->number);
}
else {
int n;
if (!string2Int(*i, n) || n < 0)
throw UsageError(format("invalid generation specifier `%1%'") % *i);
bool found = false;
for (Generations::iterator j = gens.begin(); j != gens.end(); ++j) {
if (j->number == n) {
deleteGeneration2(globals.profile, j->number);
found = true;
break;
}
}
if (!found)
printMsg(lvlError, format("generation %1% does not exist") % n);
}
}
}
static void opDefaultExpr(Globals & globals,
Strings opFlags, Strings opArgs)
{
@ -750,6 +791,8 @@ void run(Strings args)
op = opRollback;
else if (arg == "--list-generations")
op = opListGenerations;
else if (arg == "--delete-generations")
op = opDeleteGenerations;
else if (arg == "--dry-run") {
printMsg(lvlInfo, "(dry run; not doing anything)");
globals.dryRun = true;