rear/SOURCES/rear-rhbz1610638.patch
2021-10-08 16:24:02 +00:00

86 lines
3.5 KiB
Diff

diff --git a/usr/share/rear/conf/GNU/Linux.conf b/usr/share/rear/conf/GNU/Linux.conf
index 5b9343b9..f0c44381 100644
--- a/usr/share/rear/conf/GNU/Linux.conf
+++ b/usr/share/rear/conf/GNU/Linux.conf
@@ -184,6 +184,8 @@ env
w
dosfslabel
sysctl
+blockdev
+lsblk
)
# the lib* serves to cover both 32bit and 64bit libraries!
diff --git a/usr/share/rear/lib/layout-functions.sh b/usr/share/rear/lib/layout-functions.sh
index eb45115b..af1069ea 100644
--- a/usr/share/rear/lib/layout-functions.sh
+++ b/usr/share/rear/lib/layout-functions.sh
@@ -365,7 +365,9 @@ get_partition_start() {
local disk_name=$1
local start_block start
- local block_size=$(get_block_size ${disk_name%/*})
+ # When reading /sys/block/.../start or "dmsetup table", output is always in
+ # 512 bytes blocks
+ local block_size=512
if [[ -r /sys/block/$disk_name/start ]] ; then
start_block=$(< $path/start)
@@ -548,11 +550,32 @@ get_device_mapping() {
}
# Get the size in bytes of a disk/partition.
+# For disks, use "sda" as argument.
# For partitions, use "sda/sda1" as argument.
get_disk_size() {
local disk_name=$1
+ # When a partition is specified (e.g. sda/sda1)
+ # then it has to read /sys/block/sda/sda1/size in the old code below.
+ # In contrast the get_block_size() function below is different
+ # because it is non-sense asking for block size of a partition,
+ # so that the get_block_size() function below is stripping everything
+ # in front of the blockdev basename (e.g. /some/path/sda -> sda)
+ # cf. https://github.com/rear/rear/pull/1885#discussion_r207900308
+
+ # Preferably use blockdev, see https://github.com/rear/rear/issues/1884
+ if has_binary blockdev; then
+ # ${disk_name##*/} translates 'sda/sda1' into 'sda1' and 'sda' into 'sda'
+ blockdev --getsize64 /dev/${disk_name##*/} && return
+ # If blockdev fails do not error out but fall through to the old code below
+ # because blockdev fails e.g. for a CDROM device when no DVD or ISO is attached to
+ # cf. https://github.com/rear/rear/pull/1885#issuecomment-410676283
+ # and https://github.com/rear/rear/pull/1885#issuecomment-410697398
+ fi
- local block_size=$(get_block_size ${disk_name%/*})
+ # Linux always considers sectors to be 512 bytes long. See the note in the
+ # kernel source, specifically, include/linux/types.h regarding the sector_t
+ # type for details.
+ local block_size=512
retry_command test -r /sys/block/$disk_name/size || Error "Could not determine size of disk $disk_name"
@@ -565,9 +588,20 @@ get_disk_size() {
# Get the block size of a disk.
get_block_size() {
+ local disk_name="${1##*/}" # /some/path/sda -> sda
+
+ # Preferably use blockdev, see https://github.com/rear/rear/issues/1884
+ if has_binary blockdev; then
+ blockdev --getss /dev/$disk_name && return
+ # If blockdev fails do not error out but fall through to the old code below
+ # because blockdev fails e.g. for a CDROM device when no DVD or ISO is attached to
+ # cf. https://github.com/rear/rear/pull/1885#issuecomment-410676283
+ # and https://github.com/rear/rear/pull/1885#issuecomment-410697398
+ fi
+
# Only newer kernels have an interface to get the block size
- if [ -r /sys/block/$1/queue/logical_block_size ] ; then
- echo $( < /sys/block/$1/queue/logical_block_size)
+ if [ -r /sys/block/$disk_name/queue/logical_block_size ] ; then
+ echo $( < /sys/block/$disk_name/queue/logical_block_size)
else
echo "512"
fi