+ kvm -m 256 -nographic -kernel live/boot/vmlinuz -initrd live/boot/initrd.img -append 'console=ttyS0 root=/dev/vda loglevel=1 security=selinux boot=overlaytest' -drive file=live/boot/filesystem.squashfs,index=0,media=disk,if=virtio -net nic,model=virtio
Warning: vlan 0 is not connected to host network
Loading, please wait...
Begin: Loading essential drivers ... done.
Begin: Running /scripts/init-premount ... done.
Begin: Mounting root file system ... Begin: Running /scripts/nfs-top ... done.
Begin: Running /scripts/nfs-premount ... done.
+ : --> Mount a tmpfs on /live for use by overlay
+ mkdir /live
+ mount -t tmpfs tmpfs /live
+ : --> Make the two subdirs required by overlay
+ mkdir -p /live/overlay/rw /live/overlay/work
+ : --> Make /filesystem to mount the read-only squashfs
+ mkdir /filesystem
+ : --> Create a /etc directory in what will become the writable portion of
+ : --> the overlay filesystem
+ mkdir -p /live/overlay/rw/etc
+ : --> Mount the squashfs
+ mount -t squashfs /dev/vda /filesystem
+ : --> Union the tmpfs and the squashfs with overlayfs and mount them on
+ : --> /root
+ mount -t overlay -o noatime,lowerdir=/filesystem/,upperdir=/live/overlay/rw,workdir=/live/overlay/work overlay /root/
+ : --> Demonstrate that creating a file...
+ touch /root/newfile
+ : --> ... creating a directory...
+ mkdir -p /root/newdir
+ : --> ... and creating a file in the new directory all work in the
+ : --> root of the overlay filesystem...
+ touch /root/newdir/newfile
+ : --> ...before cleaning up those files/dirs
+ rm -r /root/newfile /root/newdir/newfile /root/newdir
+ : --> Demonstrate that touching an existing directory (/etc, which we
+ : --> created earlier), and a file within it, works
+ touch /root/etc/
+ touch /root/etc/newfile
+ : --> Demonstrate that touching a directory or file not already present in
+ : --> the read-write part of overlay does *NOT* work
+ touch /root/home/
touch: /root/home/: Operation not supported
+ touch /root/home/newfile
touch: /root/home/newfile: Operation not supported
+ set +x
Spawning shell within the initramfs
modprobe: module ehci-orion not found in modules.dep


BusyBox v1.22.1 (Debian 1:1.22.0-9+deb8u1) built-in shell (ash)
Enter 'help' for a list of built-in commands.

/bin/sh: can't access tty; job control turned off
(initramfs) strace touch /root/home/newfile
execve("/bin/touch", ["touch", "/root/home/newfile"], [/* 32 vars */]) = 0
brk(0)                                  = 0x1db8000
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or directory)
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f64fcfce000
access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=1358, ...}) = 0
mmap(NULL, 1358, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f64fcfcd000
close(3)                                = 0
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or directory)
open("/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0P\34\2\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=1729984, ...}) = 0
mmap(NULL, 3836448, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f64fca07000
mprotect(0x7f64fcba6000, 2097152, PROT_NONE) = 0
mmap(0x7f64fcda6000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x19f000) = 0x7f64fcda6000
mmap(0x7f64fcdac000, 14880, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f64fcdac000
close(3)                                = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f64fcfcc000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f64fcfcb000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f64fcfca000
arch_prctl(ARCH_SET_FS, 0x7f64fcfcb700) = 0
mprotect(0x7f64fcda6000, 16384, PROT_READ) = 0
mprotect(0x69a000, 4096, PROT_READ)     = 0
mprotect(0x7f64fcfd0000, 4096, PROT_READ) = 0
munmap(0x7f64fcfcd000, 1358)            = 0
getuid()                                = 0
utimes("/root/home/newfile", NULL)      = -1 ENOENT (No such file or directory)
open("/root/home/newfile", O_RDWR|O_CREAT, 0666) = -1 EOPNOTSUPP (Operation not supported)
brk(0)                                  = 0x1db8000
brk(0x1dd9000)                          = 0x1dd9000
write(2, "touch: /root/home/newfile: Opera"..., 51touch: /root/home/newfile: Operation not supported
) = 51
exit_group(1)                           = ?
+++ exited with 1 +++
(initramfs)