[PATCH v2] util/grub.d/linux: Improve initramfs detection

[Oskari Pirhonen <xxc3ncoredxx@gmail.com>]

Add detection for initramfs of the form *.img.old. For example, Gentoo's
sys-kernel/genkernel installs it as initramfs-*.img and moves any
existing one to initramfs-*.img.old.

Signed-off-by: Oskari Pirhonen <xxc3ncoredxx@gmail.com>
---
v1 -> v2:
- don't reorder the checks
- include 20_linux_xen.in

 util/grub.d/10_linux.in     | 17 +++++++++--------
 util/grub.d/20_linux_xen.in | 29 +++++++++++++++--------------
 2 files changed, 24 insertions(+), 22 deletions(-)

diff --git a/util/grub.d/10_linux.in b/util/grub.d/10_linux.in
index ca068038e..cb049e943 100644
--- a/util/grub.d/10_linux.in
+++ b/util/grub.d/10_linux.in
@@ -215,14 +215,15 @@ while [ "x$list" != "x" ] ; do
   done
 
   initrd_real=
-  for i in "initrd.img-${version}" "initrd-${version}.img" "initrd-${version}.gz" \
-	   "initrd-${version}" "initramfs-${version}.img" \
-	   "initrd.img-${alt_version}" "initrd-${alt_version}.img" \
-	   "initrd-${alt_version}" "initramfs-${alt_version}.img" \
-	   "initramfs-genkernel-${version}" \
-	   "initramfs-genkernel-${alt_version}" \
-	   "initramfs-genkernel-${GENKERNEL_ARCH}-${version}" \
-	   "initramfs-genkernel-${GENKERNEL_ARCH}-${alt_version}"; do
+  for i in "initrd.img-${version}" "initrd-${version}.img" \
+        "initrd-${alt_version}.img.old" "initrd-${version}.gz" \
+        "initrd-${alt_version}.gz.old" "initrd-${version}" \
+        "initramfs-${version}.img" "initramfs-${alt_version}.img.old" \
+        "initrd.img-${alt_version}" "initrd-${alt_version}.img" \
+        "initrd-${alt_version}" "initramfs-${alt_version}.img" \
+        "initramfs-genkernel-${version}" "initramfs-genkernel-${alt_version}" \
+        "initramfs-genkernel-${GENKERNEL_ARCH}-${version}" \
+        "initramfs-genkernel-${GENKERNEL_ARCH}-${alt_version}"; do
     if test -e "${dirname}/${i}" ; then
       initrd_real="${i}"
       break
diff --git a/util/grub.d/20_linux_xen.in b/util/grub.d/20_linux_xen.in
index f45559ff8..5a1b7b7d4 100644
--- a/util/grub.d/20_linux_xen.in
+++ b/util/grub.d/20_linux_xen.in
@@ -283,20 +283,21 @@ while [ "x${xen_list}" != "x" ] ; do
 	alt_version=`echo $version | sed -e "s,\.old$,,g"`
 	linux_root_device_thisversion="${LINUX_ROOT_DEVICE}"
 
-	initrd_real=
-	for i in "initrd.img-${version}" "initrd-${version}.img" "initrd-${version}.gz" \
-	   "initrd-${version}" "initramfs-${version}.img" \
-	   "initrd.img-${alt_version}" "initrd-${alt_version}.img" \
-	   "initrd-${alt_version}" "initramfs-${alt_version}.img" \
-	   "initramfs-genkernel-${version}" \
-	   "initramfs-genkernel-${alt_version}" \
-	   "initramfs-genkernel-${GENKERNEL_ARCH}-${version}" \
-	   "initramfs-genkernel-${GENKERNEL_ARCH}-${alt_version}" ; do
-	    if test -e "${dirname}/${i}" ; then
-		initrd_real="$i"
-		break
-	    fi
-	done
+    initrd_real=
+    for i in "initrd.img-${version}" "initrd-${version}.img" \
+        "initrd-${alt_version}.img.old" "initrd-${version}.gz" \
+        "initrd-${alt_version}.gz.old" "initrd-${version}" \
+        "initramfs-${version}.img" "initramfs-${alt_version}.img.old" \
+        "initrd.img-${alt_version}" "initrd-${alt_version}.img" \
+        "initrd-${alt_version}" "initramfs-${alt_version}.img" \
+        "initramfs-genkernel-${version}" "initramfs-genkernel-${alt_version}" \
+        "initramfs-genkernel-${GENKERNEL_ARCH}-${version}" \
+        "initramfs-genkernel-${GENKERNEL_ARCH}-${alt_version}"; do
+        if test -e "${dirname}/${i}" ; then
+            initrd_real="${i}"
+            break
+        fi
+    done
 
 	initrd=
 	if test -n "${initrd_early}" || test -n "${initrd_real}"; then
-- 
2.34.1