Make "files" a reserved word for legacy local domain

This patch introduces provider=files as a valid provider.
Upon loading the backend, its properties in confdb are overwritten to
those that represent legacy local domain.

Also document this in sssd.conf(5) and example config

1 files changed, 43 insertions, 0 deletions

diff --git a/server/providers/data_provider_be.c b/server/providers/data_provider_be.c
index c92289b6d..24d9105ef 100644
--- a/server/providers/data_provider_be.c
+++ b/server/providers/data_provider_be.c
@@ -874,6 +874,43 @@ done:
     return ret;
 }
 
+/* Some providers are just aliases for more complicated settings,
+ * rewrite the alias into the actual settings */
+static int be_rewrite(struct be_ctx *ctx)
+{
+    int ret;
+    const char *val[2];
+    val[1] = NULL;
+
+    /* "files" is a special case that means:
+     *  provider = proxy
+     *  libName  = files
+     */
+    if (strcasecmp(ctx->name, "files") == 0) {
+        DEBUG(5, ("Rewriting provider %s\n", ctx->name));
+
+        val[0] = "proxy";
+        ret = confdb_add_param(ctx->cdb, true,
+                               ctx->conf_path,
+                               "provider",
+                               val);
+        if (ret) {
+            return ret;
+        }
+
+        val[0] = "files";
+        ret = confdb_add_param(ctx->cdb, true,
+                               ctx->conf_path,
+                               "libName",
+                               val);
+        if (ret) {
+            return ret;
+        }
+    }
+
+    return EOK;
+}
+
 int be_process_init(TALLOC_CTX *mem_ctx,
                     const char *be_name,
                     const char *be_domain,
@@ -922,6 +959,12 @@ int be_process_init(TALLOC_CTX *mem_ctx,
         return ret;
     }
 
+    ret = be_rewrite(ctx);
+    if (ret != EOK) {
+        DEBUG(0, ("error rewriting provider types\n"));
+        return ret;
+    }
+
     ret = load_backend_module(ctx, BET_ID,
                               &ctx->bet_info[BET_ID].bet_ops,
                               &ctx->bet_info[BET_ID].pvt_bet_data);