Avoid speed issues with trusty

And re-enable build

.gitlab-ci.yml

@@ -25,5 +25,5 @@ before_script:
 xenial:
   <<: *build_job
 
-#trusty:
-#  <<: *build_job
+trusty:
+  <<: *build_job

trusty/x86/Dockerfile

@@ -2,6 +2,15 @@ FROM i386/ubuntu:trusty
 
 ENV DEBIAN_FRONTEND=noninteractive
 
+# This avoids long-running apt and dpkg commands
+# apt seems to close all FDs with fcntl() until the open file limit...
+RUN ( \
+  echo '#!/bin/bash'; \
+  echo 'ulimit -n 512'; \
+  echo 'exec /usr/bin/apt-get "$@"'; \
+ ) >/usr/local/sbin/apt-get \
+ && chmod +x /usr/local/sbin/apt-get
+
 RUN apt-get update \
  && apt-get install -y eatmydata \
  && eatmydata apt-get upgrade -y

trusty/x86_64/Dockerfile

@@ -2,6 +2,15 @@ FROM ubuntu:trusty
 
 ENV DEBIAN_FRONTEND=noninteractive
 
+# This avoids long-running apt and dpkg commands
+# apt seems to close all FDs with fcntl() until the open file limit...
+RUN ( \
+  echo '#!/bin/bash'; \
+  echo 'ulimit -n 512'; \
+  echo 'exec /usr/bin/apt-get "$@"'; \
+ ) >/usr/local/sbin/apt-get \
+ && chmod +x /usr/local/sbin/apt-get
+
 RUN apt-get update \
  && apt-get install -y eatmydata \
  && eatmydata apt-get upgrade -y