[2019/02/14 05:49:10.131] Running command 'shell.exec' (step 3 of 7)
[2019/02/14 05:49:10.137] # We get the raw version string (r1.2.3-45-gabcdef) from git
[2019/02/14 05:49:10.137] MONGO_VERSION=$(git describe)
[2019/02/14 05:49:10.137] git describe)
[2019/02/14 05:49:10.149] git describe
[2019/02/14 05:49:10.149] # If this is a patch build, we add the patch version id to the version string so we know
[2019/02/14 05:49:10.149] # this build was a patch, and which evergreen task it came from
[2019/02/14 05:49:10.149] if [ "" = "true" ]; then
[2019/02/14 05:49:10.149]   MONGO_VERSION="$MONGO_VERSION-patch-performance_6089c4c1d8f166b6b61cec980672779b7cedc303"
[2019/02/14 05:49:10.149] fi
[2019/02/14 05:49:10.149] # This script converts the generated version string into a sanitized version string for
[2019/02/14 05:49:10.149] # use by scons and uploading artifacts as well as information about for the scons cache.
[2019/02/14 05:49:10.149] MONGO_VERSION=$MONGO_VERSION USE_SCONS_CACHE=true /opt/mongodbtoolchain/v3/bin/python2 buildscripts/generate_compile_expansions.py --out compile_expansions.yml
[2019/02/14 05:49:10.171] Traceback (most recent call last):
[2019/02/14 05:49:10.171]   File "buildscripts/generate_compile_expansions.py", line 16, in <module>
[2019/02/14 05:49:10.173]     import yaml
ImportError: No module named yaml
[2019/02/14 05:49:10.173] Command failed: command [pid=3003] encountered problem: exit status 1
[2019/02/14 05:49:10.175] Task completed - FAILURE.