diff --git a/.cirrus.yml b/.cirrus.yml
index 45c1098..67b85e6 100644
--- a/.cirrus.yml
+++ b/.cirrus.yml
@@ -24,7 +24,7 @@ shell_lint_task:
     - apt-get -y install shellcheck
     - apt-get -y clean
   check_script:
-    - shellcheck sysa/run.sh sysb/init sysb/run.sh sysc/init sysc/run.sh sysc/run2.sh sysa/helpers.sh
+    - shellcheck sysa/run.sh sysb/init sysb/run.sh sysc/init sysc/run.sh sysc/run2.sh sysa/helpers.sh download-distfiles.sh
 
 reuse_lint_task:
   container:
diff --git a/README.rst b/README.rst
index 36c47d4..39cf501 100644
--- a/README.rst
+++ b/README.rst
@@ -167,6 +167,7 @@ repository is almost completely in a form where it can be used as the
 source of a build.
 
 1. Download required tarballs into ``sysa/distfiles`` and ``sysc/distfiles``.
+   You can use the ``download-distfiles.sh`` script.
 2. Copy sysa/stage0-posix/src/* to the root of the repository.
 3. Copy sysa/stage0-posix/src/bootstrap-seeds/POSIX/x86/kaem-optional-seed
    to init in the root of the repository.
diff --git a/download-distfiles.sh b/download-distfiles.sh
new file mode 100755
index 0000000..2877cfd
--- /dev/null
+++ b/download-distfiles.sh
@@ -0,0 +1,46 @@
+#!/bin/bash
+
+# SPDX-FileCopyrightText: 2022 fosslinux <fosslinux@aussies.space>
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+download_source() {
+    local distfiles="${1}"
+    local url="${2}"
+    local checksum="${3}"
+    local fname="${4}"
+    # Default to basename of url if not given
+    fname="${fname:-$(basename "${url}")}"
+
+    local dest_path="${distfiles}/${fname}"
+    if ! [ -e "${dest_path}" ]; then
+        echo "Downloading ${fname}"
+        curl -L "${url}" --output "${dest_path}"
+    fi
+    echo "${checksum}  ${dest_path}" | sha256sum -c
+}
+
+download_for_sys() {
+    local sysdir="${1}"
+    local distfiles="${sysdir}/distfiles"
+
+    mkdir -p "${distfiles}"
+
+    local entry
+    for entry in "${sysdir}"/*; do
+        [ -e "${entry}/sources" ] || continue
+
+        local line
+        # shellcheck disable=SC2162
+        while read line; do
+            # This is intentional - we want to split out ${line} into separate arguments.
+            # shellcheck disable=SC2086
+            download_source "${distfiles}" ${line}
+        done < "${entry}/sources"
+    done
+}
+
+set -e
+cd "$(dirname "$(readlink -f "$0")")"
+download_for_sys sysa
+download_for_sys sysc
diff --git a/sysa/helpers.sh b/sysa/helpers.sh
index a012129..150dd7d 100755
--- a/sysa/helpers.sh
+++ b/sysa/helpers.sh
@@ -131,7 +131,7 @@ build() {
     script_name=${2:-${pkg}.sh}
     dirname=${4:-${pkg}}
 
-    # shellcheck ignore=SC2015
+    # shellcheck disable=SC2015
     bin_preseed && return || true # Normal build if preseed fails
 
     cd "${SOURCES}/${pkg}" || (echo "Cannot cd into ${pkg}!"; kill $$)