My custom build stage was dropping a 2 text files on /boot and that
was causing rsync to fail on my stage when it didn't fail on stage2.
Before making this change I was getting this error:
+ mkdosfs -n boot -F 32 -v /dev/loop0
mkfs.fat: warning - lowercase labels might not work properly with DOS or Windows
+ mkfs.ext4 -O '^huge_file' /dev/loop1
mke2fs 1.42.13 (17-May-2015)
+ mount -v /dev/loop1 /home/ubuntu/ies_rpi/pi-gen/work/2017-10-04-Raspbian/export-image/rootfs -t ext4
mount: /dev/loop1 mounted on /home/ubuntu/ies_rpi/pi-gen/work/2017-10-04-Raspbian/export-image/rootfs.
+ mkdir -p /home/ubuntu/ies_rpi/pi-gen/work/2017-10-04-Raspbian/export-image/rootfs/boot
+ mount -v /dev/loop0 /home/ubuntu/ies_rpi/pi-gen/work/2017-10-04-Raspbian/export-image/rootfs/boot -t vfat
mount: /dev/loop0 mounted on /home/ubuntu/ies_rpi/pi-gen/work/2017-10-04-Raspbian/export-image/rootfs/boot.
+ rsync -aHAXx --exclude var/cache/apt/archives /home/ubuntu/ies_rpi/pi-gen/work/2017-10-04-Raspbian/stage4/rootfs/ /home/ubuntu/ies_rpi/pi-gen/work/201
7-10-04-Raspbian/export-image/rootfs/
rsync: chown "/home/ubuntu/ies_rpi/pi-gen/work/2017-10-04-Raspbian/export-image/rootfs/boot/.meta-data.57XaxF" failed: Operation not permitted (1)
rsync: chown "/home/ubuntu/ies_rpi/pi-gen/work/2017-10-04-Raspbian/export-image/rootfs/boot/.user-data.9Icrdz" failed: Operation not permitted (1)
rsync error: some files/attrs were not transferred (see previous errors) (code 23) at main.c(1183) [sender=3.1.1]
