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From bc6b4ffd4e7babd34e207c2aa8bed7f0fd8bafcf Mon Sep 17 00:00:00 2001
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From: Lukas Nykryn <lnykryn@redhat.com>
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Date: Mon, 2 Aug 2021 12:42:09 +0200
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Subject: [PATCH] dracut-functions: backport block_is_* functions
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Based on 480aa9695f8c2e2b30c8f41ae8483140020d23db
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RHEL-only
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Related: #1959336
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---
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dracut-functions.sh | 44 ++++++++++++++++++++++++++++++++++++++++++++
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1 file changed, 44 insertions(+)
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diff --git a/dracut-functions.sh b/dracut-functions.sh
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index d75696fd..14e60a9c 100755
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--- a/dracut-functions.sh
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+++ b/dracut-functions.sh
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@@ -718,3 +718,47 @@ btrfs_devs() {
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printf -- "%s\n" "$_dev"
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done
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}
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+
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+# block_is_nbd <maj:min>
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+# Check whether $1 is an nbd device
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+block_is_nbd() {
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+ [[ -b /dev/block/$1 && $1 == 43:* ]]
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+}
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+
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+# block_is_iscsi <maj:min>
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+# Check whether $1 is an nbd device
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+block_is_iscsi() {
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+ local _dir
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+ local _dev=$1
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+ [[ -L "/sys/dev/block/$_dev" ]] || return
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+ _dir="$(readlink -f "/sys/dev/block/$_dev")" || return
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+ until [[ -d "$_dir/sys" || -d "$_dir/iscsi_session" ]]; do
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+ _dir="$_dir/.."
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+ done
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+ [[ -d "$_dir/iscsi_session" ]]
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+}
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+
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+# block_is_fcoe <maj:min>
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+# Check whether $1 is an FCoE device
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+# Will not work for HBAs that hide the ethernet aspect
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+# completely and present a pure FC device
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+block_is_fcoe() {
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+ local _dir
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+ local _dev=$1
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+ [[ -L "/sys/dev/block/$_dev" ]] || return
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+ _dir="$(readlink -f "/sys/dev/block/$_dev")"
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+ until [[ -d "$_dir/sys" ]]; do
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+ _dir="$_dir/.."
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+ if [[ -d "$_dir/subsystem" ]]; then
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+ subsystem=$(basename $(readlink $_dir/subsystem))
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+ [[ $subsystem == "fcoe" ]] && return 0
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+ fi
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+ done
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+ return 1
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+}
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+
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+# block_is_netdevice <maj:min>
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+# Check whether $1 is a net device
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+block_is_netdevice() {
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+ block_is_nbd "$1" || block_is_iscsi "$1" || block_is_fcoe "$1"
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+}
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\ No newline at end of file
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