Waiting for services to be up and running...
Pulling docker image docker:stable ...
Using docker image sha256:fd7e073eb60f300c2e6c7e4035e23fff313c3a72f73c704a52095f0db736e62e for docker:stable ...
section_start:1539179051:prepare_script
Running on runner-a334e492-project-1975139-concurrent-0 via runner-a334e492-gitlab-runner-autoscale-1539178747-bdac5da2...
section_end:1539179053:prepare_script
section_start:1539179053:get_sources
Cloning repository...
Cloning into '/builds/BuildStream/buildstream'...
Checking out 122d7d0b as tpollard/494...
fatal: reference is not a tree: 122d7d0bc4514c511091be5539ad1e6ccd0673a9
section_end:1539179058:get_sources
section_start:1539179058:upload_artifacts_on_failure
section_end:1539179060:upload_artifacts_on_failure
ERROR: Job failed: exit code 1