Fix infinite recursion in bash_env

Signed-off-by: Mark Anderson <manderson@hashicorp.com>

.circleci/bash_env.sh

@@ -4,5 +4,7 @@ export GIT_COMMIT=$(git rev-parse --short HEAD)
 export GIT_COMMIT_YEAR=$(git show -s --format=%cd --date=format:%Y HEAD)
 export GIT_DIRTY=$(test -n "`git status --porcelain`" && echo "+CHANGES" || true)
 export GIT_IMPORT=github.com/hashicorp/consul/version
-export GIT_DATE=$("${CIRCLE_WORKING_DIRECTORY}/build-support/scripts/build-date.sh") # we're using this for build date because it's stable across platform builds
-export GOLDFLAGS="-X ${GIT_IMPORT}.GitCommit=${GIT_COMMIT}${GIT_DIRTY} -X $(GIT_IMPORT).BuildDate=$(GIT_DATE)"
+# we're using this for build date because it's stable across platform builds
+# the env -i and -noprofile are used to ensure we don't try to recursively call this profile when starting bash
+export GIT_DATE=$(env -i /bin/bash --noprofile -norc ${CIRCLE_WORKING_DIRECTORY}/build-support/scripts/build-date.sh)
+export GOLDFLAGS="-X ${GIT_IMPORT}.GitCommit=${GIT_COMMIT}${GIT_DIRTY} -X ${GIT_IMPORT}.BuildDate=${GIT_DATE}"