Merge "Remove static initializers for `RegisterLegacyCommand`" into main

1 files changed, 118 insertions, 0 deletions

diff --git a/src/legacy/nix-collect-garbage.cc b/src/legacy/nix-collect-garbage.cc
new file mode 100644
index 000000000..7640100a0
--- /dev/null
+++ b/src/legacy/nix-collect-garbage.cc
@@ -0,0 +1,118 @@
+#include "file-system.hh"
+#include "store-api.hh"
+#include "store-cast.hh"
+#include "gc-store.hh"
+#include "profiles.hh"
+#include "shared.hh"
+#include "globals.hh"
+#include "legacy.hh"
+#include "signals.hh"
+#include "nix-collect-garbage.hh"
+
+#include <iostream>
+#include <cerrno>
+
+namespace nix {
+
+std::string deleteOlderThan;
+bool dryRun = false;
+
+
+/* If `-d' was specified, remove all old generations of all profiles.
+ * Of course, this makes rollbacks to before this point in time
+ * impossible. */
+
+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 && canWrite) {
+            std::string link;
+            try {
+                link = readLink(path);
+            } catch (SysError & e) {
+                if (e.errNo == ENOENT) continue;
+                throw;
+            }
+            if (link.find("link") != std::string::npos) {
+                printInfo("removing old generations of profile %s", path);
+                if (deleteOlderThan != "") {
+                    auto t = parseOlderThanTimeSpec(deleteOlderThan);
+                    deleteGenerationsOlderThan(path, t, dryRun);
+                } else
+                    deleteOldGenerations(path, dryRun);
+            }
+        } else if (type == DT_DIR) {
+            removeOldGenerations(path);
+        }
+    }
+}
+
+static int main_nix_collect_garbage(int argc, char * * argv)
+{
+    {
+        bool removeOld = false;
+
+        GCOptions options;
+
+        parseCmdLine(argc, argv, [&](Strings::iterator & arg, const Strings::iterator & end) {
+            if (*arg == "--help")
+                showManPage("nix-collect-garbage");
+            else if (*arg == "--version")
+                printVersion("nix-collect-garbage");
+            else if (*arg == "--delete-old" || *arg == "-d") removeOld = true;
+            else if (*arg == "--delete-older-than") {
+                removeOld = true;
+                deleteOlderThan = getArg(*arg, arg, end);
+            }
+            else if (*arg == "--dry-run") dryRun = true;
+            else if (*arg == "--max-freed")
+                options.maxFreed = std::max(getIntArg<int64_t>(*arg, arg, end, true), (int64_t) 0);
+            else
+                return false;
+            return true;
+        });
+
+        if (removeOld) {
+            std::set<Path> dirsToClean = {
+                profilesDir(), settings.nixStateDir + "/profiles", dirOf(getDefaultProfile())};
+            for (auto & dir : dirsToClean)
+                removeOldGenerations(dir);
+        }
+
+        // Run the actual garbage collector.
+        if (!dryRun) {
+            options.action = GCOptions::gcDeleteDead;
+        } else {
+            options.action = GCOptions::gcReturnDead;
+        }
+        auto store = openStore();
+        auto & gcStore = require<GcStore>(*store);
+        GCResults results;
+        PrintFreed freed(true, results);
+        gcStore.collectGarbage(options, results);
+
+        if (dryRun) {
+            // Only print results for dry run; when !dryRun, paths will be printed as they're deleted.
+            for (auto & i : results.paths) {
+                printInfo("%s", i);
+            }
+        }
+
+        return 0;
+    }
+}
+
+void registerNixCollectGarbage() {
+    LegacyCommands::add("nix-collect-garbage", main_nix_collect_garbage);
+}
+
+}