website: blow away $JIRI_ROOT in setup instructions
Necessary because bootstrap.sh expects $JIRI_ROOT to not
already exist.
Our Jenkins test harness currently does not start each test
from a clean slate/workspace, so it's necessary to manually
blow away old unwanted state. (It would be better if the
default was a clean slate, with a whitelist for state that
should persist across tests.)
Change-Id: Ic67603bb99678d438adbfe0a411b9e4da0d79b1c
diff --git a/content/installation/step-by-step.md b/content/installation/step-by-step.md
index 094e5e4..6f572d2 100644
--- a/content/installation/step-by-step.md
+++ b/content/installation/step-by-step.md
@@ -64,6 +64,23 @@
export V23_RELEASE=${JIRI_ROOT}/release/go
```
+# Start from a clean slate
+
+The `bootstrap.sh` script checks that the `JIRI_ROOT` directory does not yet
+exist, then creates it. So, let's blow away `JIRI_ROOT` if it exists.
+
+{{# helpers.warning }}
+## Danger!
+This will blow away your `JIRI_ROOT` directory, including any pending changes to
+repositories in that directory. Make sure you're not deleting something
+important.
+{{/ helpers.warning }}
+<!-- @define_rmrf_JIRI_ROOT @test -->
+```
+# WARNING: Make sure you're not deleting something important.
+rm -rf $JIRI_ROOT
+```
+
# Fetch Vanadium repositories
Run the `bootstrap.sh` script. This script will (1) install the `jiri` tool in
