Kernel CI fails if hwpack isn't available

This issue re-produced on panda build=30

https://ci.linaro.org/jenkins/job/linux-next/hwpack=panda,label=precise_hwpack_cloud/30/console

01:31:55 ++ python lci-build-tools/get_latest_slo_hwpack
01:31:55 Traceback (most recent call last):
01:31:55 File "lci-build-tools/get_latest_slo_hwpack", line 16, in <module>
01:31:55 hwpack_url = find_latest_hwpack(hwpack_type)
01:31:55 File "/mnt/ci_build/workspace/linux-next/hwpack/panda/label/precise_hwpack_cloud/lci-build-tools/find_latest.py", line 96, in find_latest_hwpack
01:31:55 filename = find_latest(hwpack_url)
01:31:55 File "/mnt/ci_build/workspace/linux-next/hwpack/panda/label/precise_hwpack_cloud/lci-build-tools/find_latest.py", line 72, in find_latest
01:31:55 lastdate = dates.pop()
01:31:55 IndexError: pop from empty list

This issue re-produced on below builds

origen build=30
https://ci.linaro.org/jenkins/job/linux-next/hwpack=origen,label=precise_hwpack_cloud/30/console

panda build=30
https://ci.linaro.org/jenkins/job/linux-next/hwpack=panda,label=precise_hwpack_cloud/30/console

Kernel CI failed summart report:
Failed to build linux-next and linux-arm-soc-for-next: snowball hw-pack.
kernel image (zImage) build successful but failed to create hw-pack.

Failed logs:
- https://ci.linaro.org/jenkins/job/linux-next/hwpack=snowball,label=kernel_cloud/113/consoleFull
- https://ci.linaro.org/jenkins/job/linux-arm-soc-for-next/hwpack=snowball,label=kernel_cloud/115/consoleFull

Error log:
02:18:33 dpkg-deb: building package
`linux-image-3.11.0-rc2-linaro-u8500' in
`../linux-image-3.11.0-rc2-linaro-u8500_3.11.0-rc2-linaro-u8500-1_armhf.deb'.
02:18:38 ++ date +%s
02:18:38 + END=1375064317
02:18:38 + EXECUTION_TIME_IN_SEC=666
02:18:38 + '[' 1 -eq 1 ']'
02:18:38 ++ python lci-build-tools/get_latest_slo_hwpack
02:18:39 Traceback (most recent call last):
02:18:39 File "lci-build-tools/get_latest_slo_hwpack", line 16, in <module>
02:18:39 hwpack_url = find_latest_hwpack(hwpack_type)
02:18:39 File
"/mnt/ci_build/workspace/linux-next/hwpack/snowball/label/kernel_cloud/lci-build-tools/find_latest.py",
line 96, in find_latest_hwpack
02:18:39 filename = find_latest(hwpack_url)
02:18:39 File
"/mnt/ci_build/workspace/linux-next/hwpack/snowball/label/kernel_cloud/lci-build-tools/find_latest.py",
line 72, in find_latest
02:18:39 lastdate = dates.pop()
02:18:39 IndexError: pop from empty list
02:18:39 + latest_kernel=
02:18:39 + cleanup_exit
02:18:39 + cd /mnt/ci_build/workspace/linux-next/hwpack/snowball/label/kernel_cloud
02:18:39 + rm -rf lci-build-tools
02:18:39 + rm -rf builddir-3.11.0-rc2-linaro-u8500
02:18:40 Build step 'Execute shell' marked build as failure
02:18:40 Finished: FAILURE

Snowball hwpack build failure summary report:
-------------------------------------------------------------------
https://ci.linaro.org/jenkins/job/linux-next/hwpack=snowball,label=kernel_cloud/165/consoleFull
https://ci.linaro.org/jenkins/job/linux-next/hwpack=snowball,label=kernel_cloud/166/consoleFull

Build error log:
---------------------
02:31:14 ++ python lci-build-tools/get_latest_slo_hwpack
02:31:14 Traceback (most recent call last):
02:31:14 File "lci-build-tools/get_latest_slo_hwpack", line 16, in <module>
02:31:14 hwpack_url = find_latest_hwpack(hwpack_type)
02:31:14 File "/mnt/ci_build/workspace/linux-next/hwpack/snowball/label/kernel_cloud/lci-build-tools/find_latest.py", line 96, in find_latest_hwpack
02:31:14 filename = find_latest(hwpack_url)
02:31:14 File "/mnt/ci_build/workspace/linux-next/hwpack/snowball/label/kernel_cloud/lci-build-tools/find_latest.py", line 72, in find_latest
02:31:14 lastdate = dates.pop()
02:31:14 IndexError: pop from empty list

STE Snowball Kernel CI build failed on all following 3 branches since 19 September 2013:

linux-arm-soc-for-next: https://ci.linaro.org/jenkins/job/linux-arm-soc-for-next/hwpack=snowball,label=kernel_cloud/167/console
linux-mainline: https://ci.linaro.org/jenkins/job/linux-mainline/hwpack=snowball,label=kernel_cloud/165/console
linux-next: https://ci.linaro.org/jenkins/job/linux-next/hwpack=snowball,label=kernel_cloud/165/console

The error looks same:

++ python lci-build-tools/get_latest_slo_hwpack
Traceback (most recent call last):
  File "lci-build-tools/get_latest_slo_hwpack", line 16, in <module>
    hwpack_url = find_latest_hwpack(hwpack_type)
  File "/mnt/ci_build/workspace/linux-mainline/hwpack/snowball/label/kernel_cloud/lci-build-tools/find_latest.py", line 96, in find_latest_hwpack
    filename = find_latest(hwpack_url)
  File "/mnt/ci_build/workspace/linux-mainline/hwpack/snowball/label/kernel_cloud/lci-build-tools/find_latest.py", line 72, in find_latest
    lastdate = dates.pop()
IndexError: pop from empty list

So looks like the hardware pack is missing again. I also found another 2 errors in build log:

[1] ERROR: ld.so: object 'libfakeroot-sysv.so' from LD_PRELOAD cannot be preloaded: ignored.
[2] stat: cannot stat `arch/arm/boot/*.dtb': No such file or directory

I noticed that at the end of build log, it says:
Sending email to: <email address hidden>, <email address hidden>, <email address hidden>
Therefore I assume you have received notification email.

The project linux-next » snowball,kernel_cloud Build # 180 - Still Failing.
Console output at https://ci.linaro.org/jenkins/job/linux-next/./hwpack=snowball,label=kernel_cloud/180/

The project linux-next » snowball,kernel_cloud Build # 190 - Still Failing.
Console output at https://ci.linaro.org/jenkins/job/linux-next/./hwpack=snowball,label=kernel_cloud/190/

linux-next Build # 198 - Still Failing.

console output at https://ci.linaro.org/jenkins/job/linux-next/198/

 linux-next » snowball,kernel_cloud Build # 224 - Still Failing.
console output at https://ci.linaro.org/jenkins/job/linux-next/./hwpack=snowball,label=kernel_cloud/224/

linux-next » snowball,kernel_cloud Build # 240 - Still Failing.
Console output at https://ci.linaro.org/jenkins/job/linux-next/./hwpack=snowball,label=kernel_cloud/240/

linux-next » snowball,kernel_cloud Build # 256 - Still Failing
console output at https://ci.linaro.org/jenkins/job/linux-next/./hwpack=snowball,label=kernel_cloud/256

Migrated to bugzilla: https://bugs.linaro.org/show_bug.cgi?id=492