ci: extract dumping the environment into a script

Author: pietroalbini

src/ci/azure-pipelines/steps/run.yml

@@ -48,16 +48,8 @@ steps:
 - bash: python src/ci/cpu-usage-over-time.py &> cpu-usage.csv &
   displayName: "Collect CPU-usage statistics in the background"
 
-- bash: printenv | sort
-  displayName: Show environment variables
-
-- bash: |
-    set -e
-    df -h
-    du . | sort -nr | head -n100
-  displayName: Show disk usage
-  # FIXME: this hasn't been tested, but maybe it works on Windows? Should test!
-  condition: and(succeeded(), ne(variables['Agent.OS'], 'Windows_NT'))
+- bash: src/ci/scripts/dump-environment.sh
+  displayName: Show the current environment
 
 - template: install-sccache.yml
 - template: install-clang.yml

src/ci/scripts/dump-environment.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+# This script dumps information about the build environment to stdout.
+
+set -euo pipefail
+IFS=$'\n\t'
+
+echo "environment variables:"
+printenv | sort
+echo
+
+echo "disk usage:"
+df -h
+echo
+
+echo "biggest files in the working dir:"
+set +o pipefail
+du . | sort -nr | head -n100
+set -o pipefail
+echo