usr/lib/systemd/system/resize2fs-root.service

   1 [Unit]
   2 Description=Resize of File System on the Root Device
   3 DefaultDependencies=no
   4 Requires=fsck-root.service
   5 After=fsck-root.service
   6 Before=remount-rootfs.service local-fs.target shutdown.target
   7
   8 [Service]
   9 Type=oneshot
  10 RemainAfterExit=no
  11 ExecStartPre=/bin/mount -o remount,rw /
  12 ExecStart=/bin/with-dev-root-do /sbin/resize2fs
  13 ExecStartPost=/bin/ln -s /dev/null /etc/systemd/system/resize2fs-root.service
  14 ExecStartPost=/bin/mount -o remount /
  15 StandardOutput=journal+console
  16 TimeoutSec=0