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[Arista]: Add support to convert vfat file system to ext4 (#201)
This commit will convert the existing file system of flash drive on Arista switches from VFAT to EXT4 in the booting of SONiC. It will take the whole flash and therefore remove the recovery partition. There is a check in the script making sure that the conversion operation will not happen on a non-Arista switch or if the existing file system is not VFAT.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,170 @@ | ||
| #!/bin/sh | ||
|
|
||
| case $1 in | ||
| prereqs) | ||
| exit 0 | ||
| ;; | ||
| esac | ||
|
|
||
| set -e | ||
| # set -x | ||
| total_mem=$(free | awk '/^Mem:/{print $2}') | ||
| tmpfs_size=$(( $total_mem / 20 * 17 )) | ||
| free_mem_thres=$(( $total_mem / 20 * 18 )) | ||
| tmp_mnt='/mnt/ramdisk-convfs' | ||
| root_mnt='/mnt/root-convfs' | ||
| root_dev='' | ||
| flash_dev='' | ||
| block_flash='' | ||
| aboot_flag='' | ||
| backup_file='' | ||
|
|
||
| # Get the fullpath of flash device, e.g., /dev/sda | ||
| get_flash_dev() { | ||
| for dev in $(ls /sys/block); do | ||
| local is_mmc=$(echo "$dev" | grep 'mmcblk.*boot.*' | cat) | ||
| if [ -n "$is_mmc" ]; then | ||
| continue | ||
| fi | ||
| local devid=$(realpath "/sys/block/$dev/device") | ||
| local is_device=$(echo "$devid" | grep '^/sys/devices/' | cat) | ||
| local is_flash=$(echo "$devid" | grep "$block_flash" | cat) | ||
| if [ -n "$is_device" -a -n "$is_flash" ]; then | ||
| flash_dev="/dev/$dev" | ||
| return 0 | ||
| fi | ||
| done | ||
| return 1 | ||
| } | ||
|
|
||
| # Wait for root_dev to be ready | ||
| wait_for_root_dev() { | ||
| local try_rounds=30 | ||
| while [ $try_rounds -gt 0 ]; do | ||
| if [ -e "$root_dev" ]; then | ||
| return 0 | ||
| fi | ||
| sleep 1 | ||
| try_rounds=$(( $try_rounds - 1 )) | ||
| done | ||
| return 1 | ||
| } | ||
|
|
||
| # Alway run cleanup before exit | ||
| cleanup() { | ||
| if grep -q "$root_mnt" /proc/mounts; then | ||
| umount "$root_mnt" | ||
| fi | ||
| if grep -q "$tmp_mnt" /proc/mounts; then | ||
| umount "$tmp_mnt" | ||
| fi | ||
| [ -e "$root_mnt" ] && rmdir "$root_mnt" | ||
| [ -e "$tmp_mnt" ] && rmdir "$tmp_mnt" | ||
| } | ||
| trap cleanup EXIT | ||
|
|
||
| notification() { | ||
| cat << EOF | ||
| A failure happend in modifying the root file system which stopped the upgrade. Manual interventions are needed to fix the issue. Note that: | ||
| 1) files in the old root file system may have been lost and the old partition table may have been corrupted; | ||
| 2) The files in the old root file system were copied to $tmp_mnt; | ||
| 3) The old partition table was dumped to the file $tmp_mnt/$backup_file by sfdisk; | ||
| 4) Quitting the current shell will lose all files mentioned above permanently. | ||
| EOF | ||
| } | ||
|
|
||
| run_cmd() { | ||
| if ! eval "$1"; then | ||
| echo "$2" | ||
| notification | ||
| sh | ||
| exit 1 | ||
| fi | ||
| } | ||
|
|
||
| # Extract kernel parameters | ||
| set -- $(cat /proc/cmdline) | ||
| for x in "$@"; do | ||
| case "$x" in | ||
| block_flash=*) | ||
| block_flash="${x#block_flash=}" | ||
| ;; | ||
| Aboot=*) | ||
| aboot_flag="${x#Aboot=}" | ||
| esac | ||
| done | ||
| root_dev="$ROOT" | ||
|
|
||
| #Check aboot and root_dev is vfat | ||
| [ -z "$aboot_flag" ] && exit 0 | ||
| if [ -z "$root_dev" ]; then | ||
| echo "Error: root device name is not provided" | ||
| exit 1 | ||
| fi | ||
| if ! wait_for_root_dev; then | ||
| echo "Error: timeout in waiting for $root_dev" | ||
| exit 1 | ||
| fi | ||
| blkid | grep "$root_dev.*vfat" -q || exit 0 | ||
|
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||
|
|
||
| # Get flash dev name | ||
| if [ -z "$block_flash" ]; then | ||
| echo "Error: flash device info is not provided" | ||
| exit 1 | ||
| fi | ||
| if ! get_flash_dev; then | ||
| echo "Error: flash device is not found" | ||
| exit 1 | ||
| fi | ||
|
|
||
| # Check memory size for tmpfs | ||
| free_mem=$(free | awk '/^Mem:/{print $4}') | ||
| if [ "$free_mem" -lt "$free_mem_thres" ]; then | ||
| echo "Error: memory is not enough" | ||
| exit 1 | ||
| fi | ||
|
|
||
| # Backup partition table | ||
| mkdir -p "$root_mnt" | ||
| mount "$root_dev" "$root_mnt" | ||
| backup_file=backup.$(date +%Y-%m-%d.%H-%M-%S) | ||
| sfdisk -d "$flash_dev" > "$root_mnt/$backup_file" | ||
|
|
||
| # Check total size of files in root | ||
| total_file_size=$(du -s "$root_mnt" | awk '{print $1}') | ||
| if [ "$total_file_size" -gt "$tmpfs_size" ]; then | ||
| echo "Error: total file size is too large" | ||
| exit 1 | ||
| fi | ||
|
|
||
| # Create tmpfs, and copy files to tmpfs | ||
| mkdir -p "$tmp_mnt" | ||
| mount -t tmpfs -o size="${tmpfs_size}k" tmpfs "$tmp_mnt" | ||
| cp -a "$root_mnt/." "$tmp_mnt/" | ||
| umount "$root_mnt" | ||
|
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||
| #### Lines below will modify the root file system, so any failure will be trapped to shell for manual interventions. | ||
|
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||
| # Create a new partition table (content in flash_dev will be deleted) | ||
| err_msg="Error: repartitioning $flash_dev failed" | ||
| cmd="echo ';' | sfdisk $flash_dev" | ||
| run_cmd "$cmd" "$err_msg" | ||
|
|
||
| sleep 5 | ||
| err_msg="Error: timeout in waiting for $root_dev after repartition" | ||
| cmd="wait_for_root_dev" | ||
| run_cmd "$cmd" "$err_msg" | ||
|
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||
| err_msg="Error: formatting to ext4 failed" | ||
| cmd="mke2fs -t ext4 -m2 -F -O '^huge_file' $root_dev" | ||
| run_cmd "$cmd" "$err_msg" | ||
|
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||
| err_msg="Error: mounting $root_dev to $root_mnt failed" | ||
| cmd="mount -t ext4 $root_dev $root_mnt" | ||
| run_cmd "$cmd" "$err_msg" | ||
|
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||
| err_msg="Error: copying files form $tmp_mnt to $root_mnt failed" | ||
| cmd="cp -a $tmp_mnt/. $root_mnt/" | ||
| run_cmd "$cmd" "$err_msg" | ||
|
|
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,50 @@ | ||
| #!/bin/sh | ||
| #Part of the code is revised based on initramfs-tools/hooks/fsck and initramfs-tool is under GPL v2. | ||
|
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||
| PREREQ="" | ||
|
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||
| prereqs() | ||
| { | ||
| echo "$PREREQ" | ||
| } | ||
|
|
||
| case $1 in | ||
| prereqs) | ||
| prereqs | ||
| exit 0 | ||
| ;; | ||
| esac | ||
|
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||
| . /usr/share/initramfs-tools/hook-functions | ||
|
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| copy_exec /sbin/mke2fs | ||
| copy_exec /sbin/sfdisk | ||
| copy_exec /sbin/fdisk | ||
|
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| fstypes="ext4" | ||
|
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| for type in $fstypes; do | ||
| prog="/sbin/mkfs.${type}" | ||
| if [ -h "$prog" ]; then | ||
| link=$(readlink -f "$prog") | ||
| copy_exec "$link" | ||
| ln -s "$link" "${DESTDIR}/$prog" | ||
| elif [ -x "$prog" ] ; then | ||
| copy_exec "$prog" | ||
| else | ||
| echo "Warning: /sbin/mkfs.${type} doesn't exist, can't install to initramfs, ignoring." | ||
| fi | ||
| done | ||
|
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||
| for type in $fstypes; do | ||
| prog="/sbin/fsck.${type}" | ||
| if [ -h "$prog" ]; then | ||
| link=$(readlink -f "$prog") | ||
| copy_exec "$link" | ||
| ln -s "$link" "${DESTDIR}/$prog" | ||
| elif [ -x "$prog" ] ; then | ||
| copy_exec "$prog" | ||
| else | ||
| echo "Warning: /sbin/fsck.${type} doesn't exist, can't install to initramfs, ignoring." | ||
| fi | ||
| done |