From 78e9625b62fee387e65f6b5a79d5a18f36046259 Mon Sep 17 00:00:00 2001
From: Pingfan Liu <piliu@redhat.com>
Date: Tue, 13 Jun 2023 17:43:21 +0800
Subject: [PATCH] kdump-lib: Introduce parse_kver_from_path() to get kernel
 version from its path name

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=2160676
Upstream: Fedora rawhide
Conflict: None

commit d8b961be37de09289a2ffff8c9c51cca4d153a92
Author: Pingfan Liu <piliu@redhat.com>
Date:   Tue Jun 13 17:43:21 2023 +0800

    kdump-lib: Introduce parse_kver_from_path() to get kernel version from its path name

    kdump_get_arch_recommend_crashkernel() expects the kernel version info,
    while _update_kernel() provides the absolute path, which contains the
    kernel version info.

    This patch introduce a dedicated function parse_kver_from_path() to
    extract the kernel info from the path

    Credit to Philipp, who contributes the original code.

    Signed-off-by: Pingfan Liu <piliu@redhat.com>
    Reviewed-by: Coiby Xu <coxu@redhat.com>
    Reviewed-by: Philipp Rudo <prudo@redhat.com>

Signed-off-by: Pingfan Liu <piliu@redhat.com>
---
 kdump-lib.sh | 43 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/kdump-lib.sh b/kdump-lib.sh
index 6009360..e15ec22 100755
--- a/kdump-lib.sh
+++ b/kdump-lib.sh
@@ -648,6 +648,49 @@ prepare_kdump_kernel()
 	echo "$kdump_kernel"
 }
 
+_is_valid_kver()
+{
+	[[ -f /usr/lib/modules/$1/modules.dep ]]
+}
+
+# This function is introduced since 64k variant may be installed on 4k or vice versa
+# $1 the kernel path name.
+parse_kver_from_path()
+{
+	local _img _kver
+
+	[[ -z "$1" ]] && return
+
+	_img=$1
+	BLS_ENTRY_TOKEN=$(</etc/machine-id)
+
+	# Fedora standard installation, i.e. $BOOT/vmlinuz-<version>
+	_kver=${_img##*/vmlinuz-}
+	_kver=${_kver%"$KDUMP_IMG_EXT"}
+	if _is_valid_kver "$_kver"; then
+		echo "$_kver"
+		return
+	fi
+
+	# BLS recommended image names, i.e. $BOOT/<token>/<version>/linux
+	_kver=${_img##*/"$BLS_ENTRY_TOKEN"/}
+	_kver=${_kver%%/*}
+	if _is_valid_kver "$_kver"; then
+		echo "$_kver"
+		return
+	fi
+
+	# Fedora UKI installation, i.e. $BOOT/efi/EFI/Linux/<token>-<version>.efi
+	_kver=${_img##*/"$BLS_ENTRY_TOKEN"-}
+	_kver=${_kver%.efi}
+	if _is_valid_kver "$_kver"; then
+		echo "$_kver"
+		return
+	fi
+
+	ddebug "Could not parse version from $_img"
+}
+
 _get_kdump_kernel_version()
 {
 	local _version _version_nondebug