Script the Chrome Enterprise Core enrolment

Enrolling is what lifts the off-store restriction without joining a domain, and
it is one machine-scoped token in both places Chrome looks: HKLM on Windows, a
file under /etc/opt/chrome/policies/enrollment on Linux. Both scripts take
--remove, and both say plainly that removing the token locally does not release
the seat in the Admin console.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

scripts/enroll-chrome-management.sh

@@ -0,0 +1,47 @@
+#!/usr/bin/env bash
+# Enrol this machine's Chrome in Chrome Enterprise Core.
+#
+# The Linux counterpart to enroll-chrome-management.ps1. Chrome reads the token
+# from a file under /etc at startup, so this needs root, and it applies to every
+# user on the machine.
+#
+#   sudo scripts/enroll-chrome-management.sh <token>
+#   sudo scripts/enroll-chrome-management.sh --remove
+#
+# Chrome only — Chromium builds have no cloud-management support, so a Chromium
+# install cannot be enrolled and stays subject to the off-store restriction.
+set -euo pipefail
+
+DIR=/etc/opt/chrome/policies/enrollment
+TOKEN_FILE="$DIR/CloudManagementEnrollmentToken"
+
+info() { printf '  %s\n' "$1"; }
+fail() { printf '\n\033[1;31mERROR: %s\033[0m\n' "$1" >&2; exit 1; }
+
+[ "$(id -u)" -eq 0 ] || fail "run this with sudo — the token lives under /etc"
+[ $# -ge 1 ] || fail "usage: $0 <enrollment-token> | --remove"
+
+if [ "$1" = "--remove" ]; then
+    rm -f "$TOKEN_FILE" "$DIR/CloudManagementEnrollmentOptions"
+    info "removed $TOKEN_FILE"
+    info "Restart Chrome. This stops it asking for policy, but does not undo the"
+    info "enrolment on Google's side — delete the browser from Devices > Chrome >"
+    info "Managed browsers too."
+    exit 0
+fi
+
+[ -d /etc/opt/chrome ] || fail "no /etc/opt/chrome — this is for Google Chrome, not Chromium"
+
+mkdir -p "$DIR"
+# The file must contain the token and nothing else: no quotes, no newline noise,
+# no filename extension. Chrome reads it verbatim.
+printf '%s' "$1" > "$TOKEN_FILE"
+chmod 644 "$TOKEN_FILE"
+info "wrote $TOKEN_FILE"
+
+echo
+info "Next:"
+info "  1. Restart Chrome completely."
+info "  2. chrome://policy should name the Admin console as a policy source, and"
+info "     chrome://management should say the browser is managed."
+info "  3. Then: sudo scripts/install-extension-policy.sh"