From 693ba6e8a6f15556be2a1bfd247f614475688d16 Mon Sep 17 00:00:00 2001
From: Iacopo Isimbaldi <isiachi@rhye.it>
Date: Fri, 15 Jan 2016 02:22:55 +0100
Subject: Updated zfs.install

Now invoke mkinitcpio if "zfs" hook is present in mkinitcpio.conf file
---
 zfs.install | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)

diff --git a/zfs.install b/zfs.install
index 28e3d16..6cba9a6 100644
--- a/zfs.install
+++ b/zfs.install
@@ -3,7 +3,9 @@ post_install() {
     cat << EOF
 ==> To build and install your modules run: dkms install zfs/${1%%[_-]*} -k [KERNEL]
 ==> To do this automatically at startup run: systemctl enable dkms.service
+
 EOF
+    check_hook
 }
 
 pre_upgrade() {
@@ -21,3 +23,56 @@ post_upgrade() {
 pre_remove() {
     [ -n "${1%%[-_]*}" ] && dkms remove zfs/${1%%[-_]*} --all -q || true
 }
+
+post_remove() {
+    check_hook remove
+}
+
+check_hook() {
+    ZFSHOOKFILES=()
+
+    for preset in /etc/mkinitcpio.d/*.preset; do
+        source $preset
+        CONF_FILE=()
+
+        if [ -n "${ALL_config}" ]; then
+            CONF_FILE+=("${ALL_config}")
+            unset ALL_config
+        fi
+
+        for prefix in ${PRESETS[@]}; do
+            varname="${prefix}_config"
+            if [ -n "$(eval echo \$$varname)" ]; then
+                eval CONF_FILE+=("$(eval echo \$$varname)")
+                unset $varname
+            fi
+        done
+
+        i=0
+        unset ZFSHOOKPRESENCE
+        while [ $i -lt ${#CONF_FILE[@]} ]; do
+            if [ -e "${CONF_FILE[$i]}" ] && [ $(grep -q "zfs" ${CONF_FILE[$i]} && echo -n "1") ]; then
+                ZFSHOOKPRESENCE=1
+                if [ "$1" == "remove" ] && [ $(echo -n "${ZFSHOOKFILES[@]}" | grep -q "${CONF_FILE[$i]}" || echo -n "1") ]; then
+                    ZFSHOOKFILES+=("${CONF_FILE[$i]}")
+                fi
+            fi
+            i+=1
+        done
+
+        if [ ${ZFSHOOKPRESENCE} ]; then
+            if [ "$1" != "remove" ]; then
+                echo "==> Generating initial ramdisk for $(basename "$preset" .preset), using mkinitcpio. Please wait..."
+                mkinitcpio -p $(basename "$preset" .preset)
+            fi
+        fi
+    done
+
+    if [ "$1" == "remove" ] && [ ${#ZFSHOOKFILES[@]} -gt 0 ]; then
+        echo "==> zfs-dkms package has been removed but \"zfs\" is still in the hooks list of:"
+        for file in ${ZFSHOOKFILES[@]}; do
+            echo "  -> ${file}"
+        done
+        echo "==> Remove \"zfs\" and generate a new initrd."
+    fi
+}
-- 
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