nspawn: support ephemeral boots from images

[elogind.git] / src / basic / rm-rf.c

diff --git a/src/basic/rm-rf.c b/src/basic/rm-rf.c
index 6912b23f5fc89430389ca6a96c1b5c2c1a479ef5..78de895d35d7188aebd699f632ceaa088d735fbb 100644 (file)
--- a/src/basic/rm-rf.c
+++ b/src/basic/rm-rf.c
@@ -27,6 +27,7 @@
 #include <unistd.h>
 
 //#include "btrfs-util.h"
+#include "cgroup-util.h"
 #include "fd-util.h"
 #include "log.h"
 #include "macro.h"
@@ -36,9 +37,14 @@
 #include "stat-util.h"
 #include "string-util.h"
 
+static bool is_physical_fs(const struct statfs *sfs) {
+        return !is_temporary_fs(sfs) && !is_cgroup_fs(sfs);
+}
+
 int rm_rf_children(int fd, RemoveFlags flags, struct stat *root_dev) {
         _cleanup_closedir_ DIR *d = NULL;
         int ret = 0, r;
+        struct statfs sfs;
 
         assert(fd >= 0);
 
@@ -47,13 +53,13 @@ int rm_rf_children(int fd, RemoveFlags flags, struct stat *root_dev) {
 
         if (!(flags & REMOVE_PHYSICAL)) {
 
-                r = fd_is_temporary_fs(fd);
+                r = fstatfs(fd, &sfs);
                 if (r < 0) {
                         safe_close(fd);
-                        return r;
+                        return -errno;
                 }
 
-                if (!r) {
+                if (is_physical_fs(&sfs)) {
                         /* We refuse to clean physical file systems
                          * with this call, unless explicitly
                          * requested. This is extra paranoia just to
@@ -128,7 +134,7 @@ int rm_rf_children(int fd, RemoveFlags flags, struct stat *root_dev) {
                                 continue;
                         }
 
-#if 0
+#if 0 /// elogind does not support BTRFS this directly
                         if ((flags & REMOVE_SUBVOLUME) && st.st_ino == 256) {
 
                                 /* This could be a subvolume, try to remove it */
@@ -190,7 +196,7 @@ int rm_rf(const char *path, RemoveFlags flags) {
                 return -EPERM;
         }
 
-#if 0
+#if 0 /// elogind does not support BTRFS this directly
         if ((flags & (REMOVE_SUBVOLUME|REMOVE_ROOT|REMOVE_PHYSICAL)) == (REMOVE_SUBVOLUME|REMOVE_ROOT|REMOVE_PHYSICAL)) {
                 /* Try to remove as subvolume first */
                 r = btrfs_subvol_remove(path, BTRFS_REMOVE_RECURSIVE|BTRFS_REMOVE_QUOTA);
@@ -214,7 +220,7 @@ int rm_rf(const char *path, RemoveFlags flags) {
                         if (statfs(path, &s) < 0)
                                 return -errno;
 
-                        if (!is_temporary_fs(&s)) {
+                        if (is_physical_fs(&s)) {
                                 log_error("Attempted to remove disk file system, and we can't allow that.");
                                 return -EPERM;
                         }