1 files changed, 78 insertions, 0 deletions
diff --git a/upgrade.c b/upgrade.c
new file mode 100644
index 0000000..e4c75bb
--- /dev/null
+++ b/upgrade.c
@@ -0,0 +1,78 @@
+/* snac - A simple, minimalistic ActivityPub instance */
+/* copyright (c) 2022 grunfink - MIT license */
+
+#include "xs.h"
+#include "xs_io.h"
+#include "xs_json.h"
+#include "xs_glob.h"
+
+#include "snac.h"
+
+#include <sys/stat.h>
+
+
+int db_upgrade(d_char **error)
+{
+    int ret = 1;
+    int changed = 0;
+    double f = 0.0;
+
+    for (;;) {
+        char *layout = xs_dict_get(srv_config, "layout");
+        double nf;
+
+        f = nf = xs_number_get(layout);
+
+        if (!(f < db_layout))
+            break;
+
+        srv_log(xs_fmt("db_upgrade %1.1lf < %1.1lf", f, db_layout));
+
+        if (f < 2.0) {
+            *error = xs_fmt("ERROR: unsupported old disk layout %1.1lf\n", f);
+            ret    = 0;
+            break;
+        }
+        else
+        if (f < 2.1) {
+            xs *dir = xs_fmt("%s/object", srv_basedir);
+            mkdir(dir, 0755);
+
+            nf = 2.1;
+        }
+
+        if (f < nf) {
+            f          = nf;
+            xs *nv     = xs_number_new(f);
+            srv_config = xs_dict_set(srv_config, "layout", nv);
+
+            srv_log(xs_fmt("db_upgrade converted to version %1.1lf", f));
+            changed++;
+        }
+        else
+            break;
+    }
+
+    if (f > db_layout) {
+        *error = xs_fmt("ERROR: unknown future version %lf\n", f);
+        ret    = 0;
+    }
+
+    if (changed) {
+        /* upgrade the configuration file */
+        xs *fn = xs_fmt("%s/server.json", srv_basedir);
+        FILE *f;
+
+        if ((f = fopen(fn, "w")) != NULL) {
+            xs *j = xs_json_dumps_pp(srv_config, 4);
+            fwrite(j, strlen(j), 1, f);
+            fclose(f);
+
+            srv_log(xs_fmt("upgraded db %s after %d changes", fn, changed));
+        }
+        else
+            ret = 0;
+    }
+
+    return ret;
+}