overlay: create a common function for deleting all overlay data (optionally excluding...

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

diff --git a/jffs2reset.c b/jffs2reset.c
index 6beb81e70e86ec050083bfa30507b9a3d464c444..c9d4f5fb182cfe1027a78dee77d4dc2f1eeffa52 100644 (file)
--- a/jffs2reset.c
+++ b/jffs2reset.c
@@ -27,33 +27,6 @@
 #include "libfstools/libfstools.h"
 #include "libfstools/volume.h"
 
-static int
-handle_rmdir(const char *dir)
-{
-       struct dirent *dt;
-       struct stat st;
-       DIR *d;
-       int fd;
-
-       d = opendir(dir);
-       if (!d)
-               return -1;
-
-       fd = dirfd(d);
-
-       while ((dt = readdir(d)) != NULL) {
-               if (fstatat(fd, dt->d_name, &st, AT_SYMLINK_NOFOLLOW) || S_ISDIR(st.st_mode))
-                       continue;
-
-               unlinkat(fd, dt->d_name, 0);
-       }
-
-       closedir(d);
-       rmdir(dir);
-
-       return 0;
-}
-
 static int
 ask_user(int argc, char **argv)
 {
@@ -89,7 +62,7 @@ jffs2_reset(int argc, char **argv)
        mp = find_mount_point(v->blk, 1);
        if (mp) {
                ULOG_INFO("%s is mounted as %s, only erasing files\n", v->blk, mp);
-               foreachdir(mp, handle_rmdir);
+               overlay_delete(mp, false);
                mount(mp, "/", NULL, MS_REMOUNT, 0);
        } else {
                ULOG_INFO("%s is not mounted, erasing it\n", v->blk);

diff --git a/libfstools/libfstools.h b/libfstools/libfstools.h
index a9f8576207546dc682b7929d9a56e1f406608b19..1d41eea42feafa3aa8ffe92b79bf95210a7d9581 100644 (file)
--- a/libfstools/libfstools.h
+++ b/libfstools/libfstools.h
@@ -48,4 +48,6 @@ extern int jffs2_switch(struct volume *v);
 extern int handle_whiteout(const char *dir);
 extern void foreachdir(const char *dir, int (*cb)(const char*));
 
+extern void overlay_delete(const char *dir, bool keep_sysupgrade);
+
 #endif

diff --git a/libfstools/overlay.c b/libfstools/overlay.c
index 21012ba1ab1367999e88fe1034bfc2739585656a..c5356931cceb4007a62164caca60b88b838585a8 100644 (file)
--- a/libfstools/overlay.c
+++ b/libfstools/overlay.c
@@ -32,6 +32,38 @@
 
 #define SWITCH_JFFS2 "/tmp/.switch_jffs2"
 
+static bool keep_sysupgrade;
+
+static int
+handle_rmdir(const char *dir)
+{
+       struct dirent *dt;
+       struct stat st;
+       DIR *d;
+       int fd;
+
+       d = opendir(dir);
+       if (!d)
+               return -1;
+
+       fd = dirfd(d);
+
+       while ((dt = readdir(d)) != NULL) {
+               if (fstatat(fd, dt->d_name, &st, AT_SYMLINK_NOFOLLOW) || S_ISDIR(st.st_mode))
+                       continue;
+
+               if (keep_sysupgrade && !strcmp(dt->d_name, "sysupgrade.tgz"))
+                       continue;
+
+               unlinkat(fd, dt->d_name, 0);
+       }
+
+       closedir(d);
+       rmdir(dir);
+
+       return 0;
+}
+
 void
 foreachdir(const char *dir, int (*cb)(const char*))
 {
@@ -51,6 +83,13 @@ foreachdir(const char *dir, int (*cb)(const char*))
        cb(dir);
 }
 
+void
+overlay_delete(const char *dir, bool _keep_sysupgrade)
+{
+       keep_sysupgrade = _keep_sysupgrade;
+       foreachdir(dir, handle_rmdir);
+}
+
 static int
 overlay_mount(struct volume *v, char *fs)
 {