repart: load libraries before forking off child

src/repart/meson.build

@@ -16,6 +16,7 @@ executables += [
                 'dependencies' : [
                         libblkid_cflags,
                         libfdisk,
+                        libmount_cflags,
                         libopenssl,
                         threads,
                 ],
@@ -35,6 +36,7 @@ executables += [
                 'dependencies' : [
                         libblkid_cflags,
                         libfdisk,
+                        libmount_cflags,
                         libopenssl,
                         threads,
                 ],

src/repart/repart.c

@@ -50,6 +50,7 @@
 #include "initrd-util.h"
 #include "io-util.h"
 #include "json-util.h"
+#include "libmount-util.h"
 #include "list.h"
 #include "loop-util.h"
 #include "main-func.h"
@@ -6616,6 +6617,8 @@ static int partition_populate_filesystem(Context *context, Partition *p, const c
          * appear in the host namespace. Hence we fork a child that has its own file system namespace and
          * detached mount propagation. */
 
+        (void) dlopen_libmount();
+
         r = safe_fork("(sd-copy)", FORK_DEATHSIG_SIGTERM|FORK_LOG|FORK_WAIT|FORK_NEW_MOUNTNS|FORK_MOUNTNS_SLAVE, NULL);
         if (r < 0)
                 return r;