From 30c6dce7f7d3808b544ac1c3dbcb4d32c9831c60 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=D0=BD=D0=B0=D0=B1?= <nabijaczleweli@nabijaczleweli.xyz>
Date: Mon, 4 Apr 2022 23:39:18 +0200
Subject: [PATCH] contrib: dracut: don't require essentials to be under the
 same encroot
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Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #13291
---
 contrib/dracut/90zfs/mount-zfs.sh.in    |  1 +
 contrib/dracut/90zfs/zfs-load-key.sh.in | 67 ++++++++++++++-----------
 2 files changed, 38 insertions(+), 30 deletions(-)

diff --git a/contrib/dracut/90zfs/mount-zfs.sh.in b/contrib/dracut/90zfs/mount-zfs.sh.in
index 5d02a8d745..fa9f1bb767 100755
--- a/contrib/dracut/90zfs/mount-zfs.sh.in
+++ b/contrib/dracut/90zfs/mount-zfs.sh.in
@@ -93,6 +93,7 @@ if ! zpool get -Ho name "${ZFS_POOL}" > /dev/null 2>&1; then
 fi
 
 # Load keys if we can or if we need to
+# TODO: for_relevant_root_children like in zfs-load-key.sh.in
 if [ "$(zpool get -Ho value feature@encryption "${ZFS_POOL}")" = 'active' ]; then
 	# if the root dataset has encryption enabled
 	ENCRYPTIONROOT="$(zfs get -Ho value encryptionroot "${ZFS_DATASET}")"
diff --git a/contrib/dracut/90zfs/zfs-load-key.sh.in b/contrib/dracut/90zfs/zfs-load-key.sh.in
index 97e9246d46..d916f43b4e 100755
--- a/contrib/dracut/90zfs/zfs-load-key.sh.in
+++ b/contrib/dracut/90zfs/zfs-load-key.sh.in
@@ -22,36 +22,43 @@ fi
 
 [ "$(zpool get -Ho value feature@encryption "${BOOTFS%%/*}")" = 'active' ] || return 0
 
-ENCRYPTIONROOT="$(zfs get -Ho value encryptionroot "${BOOTFS}")"
-[ "${ENCRYPTIONROOT}" = "-" ] && return 0
+_load_key_cb() {
+    dataset="$1"
 
-[ "$(zfs get -Ho value keystatus "${ENCRYPTIONROOT}")" = "unavailable" ] || return 0
+    ENCRYPTIONROOT="$(zfs get -Ho value encryptionroot "${dataset}")"
+    [ "${ENCRYPTIONROOT}" = "-" ] && return 0
 
-KEYLOCATION="$(zfs get -H -o value keylocation "${ENCRYPTIONROOT}")"
-case "${KEYLOCATION%%://*}" in
-    prompt)
-        for _ in 1 2 3; do
-            systemd-ask-password --no-tty "Encrypted ZFS password for ${BOOTFS}" | zfs load-key "${ENCRYPTIONROOT}" && break
-        done
-        ;;
-    http*)
-        systemctl start network-online.target
-        zfs load-key "${ENCRYPTIONROOT}"
-        ;;
-    file)
-        KEYFILE="${KEYLOCATION#file://}"
-        [ -r "${KEYFILE}" ] || udevadm settle
-        [ -r "${KEYFILE}" ] || {
-            info "ZFS: Waiting for key ${KEYFILE} for ${ENCRYPTIONROOT}..."
-            for _ in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20; do
-                sleep 0.5s
-                [ -r "${KEYFILE}" ] && break
+    [ "$(zfs get -Ho value keystatus "${ENCRYPTIONROOT}")" = "unavailable" ] || return 0
+
+    KEYLOCATION="$(zfs get -Ho value keylocation "${ENCRYPTIONROOT}")"
+    case "${KEYLOCATION%%://*}" in
+        prompt)
+            for _ in 1 2 3; do
+                systemd-ask-password --no-tty "Encrypted ZFS password for ${dataset}" | zfs load-key "${ENCRYPTIONROOT}" && break
             done
-        }
-        [ -r "${KEYFILE}" ] || warn "ZFS: Key ${KEYFILE} for ${ENCRYPTIONROOT} hasn't appeared. Trying anyway."
-        zfs load-key "${ENCRYPTIONROOT}"
-        ;;
-    *)
-        zfs load-key "${ENCRYPTIONROOT}"
-        ;;
-esac
+            ;;
+        http*)
+            systemctl start network-online.target
+            zfs load-key "${ENCRYPTIONROOT}"
+            ;;
+        file)
+            KEYFILE="${KEYLOCATION#file://}"
+            [ -r "${KEYFILE}" ] || udevadm settle
+            [ -r "${KEYFILE}" ] || {
+                info "ZFS: Waiting for key ${KEYFILE} for ${ENCRYPTIONROOT}..."
+                for _ in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20; do
+                    sleep 0.5s
+                    [ -r "${KEYFILE}" ] && break
+                done
+            }
+            [ -r "${KEYFILE}" ] || warn "ZFS: Key ${KEYFILE} for ${ENCRYPTIONROOT} hasn't appeared. Trying anyway."
+            zfs load-key "${ENCRYPTIONROOT}"
+            ;;
+        *)
+            zfs load-key "${ENCRYPTIONROOT}"
+            ;;
+    esac
+}
+
+_load_key_cb "$BOOTFS"
+for_relevant_root_children "$BOOTFS" _load_key_cb