(amd64)ubuntu@localhost:~$ sudo system-image-cli -C /writable/cache/system/etc/system-image/config.d/ -n -v
[systemimage] Oct 13 10:37:46 2015 (1310) Looking for blacklist: https://system-image.ubuntu.com/gpg/blacklist.tar.xz
[systemimage] Oct 13 10:37:46 2015 (1310) [0x7f4630283908] Requesting group download:
	https://system-image.ubuntu.com/gpg/blacklist.tar.xz -> /var/lib/system-image/keyring.tar.xz
	https://system-image.ubuntu.com/gpg/blacklist.tar.xz.asc -> /var/lib/system-image/keyring.tar.xz.asc

[systemimage] Oct 13 10:37:47 2015 (1310) Local blacklist file: /var/lib/system-image/blacklist.tar.xz
[systemimage] Oct 13 10:37:47 2015 (1310) Looking for: https://system-image.ubuntu.com/channels.json
[systemimage] Oct 13 10:37:47 2015 (1310) [0x7f462f73fb38] Requesting group download:
	https://system-image.ubuntu.com/channels.json -> /tmp/system-image-vm_c347c/channels.json
	https://system-image.ubuntu.com/channels.json.asc -> /tmp/system-image-vm_c347c/channels.json.asc

[systemimage] Oct 13 10:37:48 2015 (1310) Local channels file: /tmp/system-image-vm_c347c/channels.json
[systemimage] Oct 13 10:37:48 2015 (1310) got channel: ubuntu-core/rolling/edge
[systemimage] Oct 13 10:37:48 2015 (1310) found channel/device entry: ubuntu-core/rolling/edge/generic_amd64
[systemimage] Oct 13 10:37:48 2015 (1310) [0x7f462f73fb38] Requesting group download:
	https://system-image.ubuntu.com/ubuntu-core/rolling/edge/generic_amd64/index.json -> /tmp/system-image-vm_c347c/index.json
	https://system-image.ubuntu.com/ubuntu-core/rolling/edge/generic_amd64/index.json.asc -> /tmp/system-image-vm_c347c/index.json.asc

[systemimage] Oct 13 10:37:49 2015 (1310) Upgrade path is 201
Upgrade path is 201
Target phase: 9%