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nix-collect-garbage: Don't barf on unreadable directories

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And don't try to delete generations from unwritable directories.
This commit is contained in:
Eelco Dolstra 2015-05-21 15:04:05 +02:00
parent 8d813fe3e0
commit 4441e4cc13
1 changed files with 7 additions and 5 deletions
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10
src/nix-collect-garbage/nix-collect-garbage.cc
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@ -34,21 +34,23 @@ void runProgramSimple(Path program, const Strings & args)
void removeOldGenerations(std::string dir)
{
if (access(dir.c_str(), R_OK) != 0) return;
bool canWrite = access(dir.c_str(), W_OK) == 0;
for (auto & i : readDirectory(dir)) {
checkInterrupt();
auto path = dir + "/" + i.name;
auto type = i.type == DT_UNKNOWN ? getFileType(path) : i.type;
if (type == DT_LNK) {
if (type == DT_LNK && canWrite) {
auto link = readLink(path);
if (link.find("link") != string::npos) {
printMsg(lvlInfo, format("removing old generations of profile %1%") % path);
auto args = Strings{"-p", path, "--delete-generations", gen};
if (dryRun) {
args.push_back("--dry-run");
}
if (dryRun) args.push_back("--dry-run");
runProgramSimple(settings.nixBinDir + "/nix-env", args);
}
} else if (type == DT_DIR) {