From ca482036c7eabbfcacd60349cc3312208fe4f6ac Mon Sep 17 00:00:00 2001
From: Benjamin Berg <bberg@redhat.com>
Date: Wed, 31 Jul 2019 16:00:12 +0200
Subject: [PATCH] storage: Add function to discover users that have prints

For sensors with internal storage we may want to garbage collect prints.
Adding this API means we can list all local prints, allowing us to find
out whether there are prints on the device's storage with no
corresponding print on the host.
---
 src/file_storage.c | 23 +++++++++++++++++++++++
 src/file_storage.h |  1 +
 src/main.c         |  1 +
 src/storage.h      |  2 ++
 4 files changed, 27 insertions(+)

diff --git a/src/file_storage.c b/src/file_storage.c
index 90c001d..c7278fb 100644
--- a/src/file_storage.c
+++ b/src/file_storage.c
@@ -254,6 +254,29 @@ GSList *file_storage_discover_prints(FpDevice *dev, const char *username)
 	return list;
 }
 
+GSList *file_storage_discover_users()
+{
+	g_autoptr(GError) err = NULL;
+	GSList *list = NULL;
+	const gchar *ent;
+	GDir *dir = g_dir_open(FILE_STORAGE_PATH, 0, &err);
+
+	if (!dir) {
+		return list;
+	}
+
+	while ((ent = g_dir_read_name(dir))) {
+		/* ent is a username */
+		if (*ent == 0)
+			continue;
+
+		list = g_slist_prepend(list, g_strdup (ent));
+	}
+
+	g_dir_close(dir);
+	return list;
+}
+
 int file_storage_init(void)
 {
 	/* Nothing to do */
diff --git a/src/file_storage.h b/src/file_storage.h
index 4d276fa..2209410 100644
--- a/src/file_storage.h
+++ b/src/file_storage.h
@@ -38,5 +38,6 @@ int file_storage_init(void);
 int file_storage_deinit(void);
 
 GSList *file_storage_discover_prints(FpDevice *dev, const char *username);
+GSList *file_storage_discover_users(void);
 
 #endif
diff --git a/src/main.c b/src/main.c
index bd25a70..05184ea 100644
--- a/src/main.c
+++ b/src/main.c
@@ -46,6 +46,7 @@ set_storage_file (void)
 	store.print_data_load = &file_storage_print_data_load;
 	store.print_data_delete = &file_storage_print_data_delete;
 	store.discover_prints = &file_storage_discover_prints;
+	store.discover_users = &file_storage_discover_users;
 }
 
 static gboolean
diff --git a/src/storage.h b/src/storage.h
index 6b8afc1..3819b87 100644
--- a/src/storage.h
+++ b/src/storage.h
@@ -31,6 +31,7 @@ typedef int (*storage_print_data_delete)(FpDevice   *dev,
                                          FpFinger    finger,
                                          const char *username);
 typedef GSList *(*storage_discover_prints)(FpDevice *dev, const char *username);
+typedef GSList *(*storage_discover_users)();
 typedef int (*storage_init)(void);
 typedef int (*storage_deinit)(void);
 
@@ -41,6 +42,7 @@ struct storage {
 	storage_print_data_load print_data_load;
 	storage_print_data_delete print_data_delete;
 	storage_discover_prints discover_prints;
+	storage_discover_users discover_users;
 };
 
 typedef struct storage fp_storage;