[haveged] introduce new module

for early entropy generation

1 files changed, 41 insertions, 0 deletions

diff --git a/builder/modules.d/haveged/module-setup.sh b/builder/modules.d/haveged/module-setup.sh
new file mode 100644
index 00000000..d3183dbe
--- /dev/null
+++ b/builder/modules.d/haveged/module-setup.sh
@@ -0,0 +1,41 @@
+#!/bin/bash
+
+check() {
+	if ! hash haveged 2>/dev/null; then
+		warn "Could not find haveged in $PATH. Check if its installed."
+		return 1
+	fi
+	return 0
+}
+# called by dracut
+install() {
+	# see where haveged is installed
+	local haveged_bin="$(command -v haveged)"
+	if [ -z "$haveged_bin" ]; then
+		warn "Could not find havaged in $PATH. Check if its installed."
+		return 1
+	fi
+	# TODO SysVInit support, if that even a thing anymore :)
+	local haveged_service="$systemdsystemunitdir/haveged.service"
+	if [ ! -f "$haveged_service" ]; then
+		# query systemd	directly
+		haveged_service="$(systemctl show -p FragmentPath haveged | cut -c 14-)"
+		if [ -z "$haveged_service" ]; then
+			warn "Could not find haveged service in '$systemdsystemunitdir' or by querying systemd."
+			warn "Check if it is installed properly."
+			return 1
+		fi
+	fi
+	inst_multiple -o \
+		"$haveged_bin" \
+		"$haveged_service"
+
+	# In Ubuntu, the service sources an EnvironmentFile for default options
+	local haveged_env_file="$(grep -oP '^EnvironmentFile=-?\K.*' $haveged_service)"
+	if [ -n "$haveged_env_file" ]; then
+		mkdir -p "$initdir/${haveged_env_file%/*}" 2>/dev/null
+		cp "$haveged_env_file" "$initdir/$haveged_env_file"
+	fi
+	mkdir "$initdir/$systemdsystemunitdir/sysinit.target.wants" 2>/dev/null
+	ln_r "$systemdsystemunitdir/haveged.service" "$systemdsystemunitdir/sysinit.target.wants/haveged.service"
+}