[Compass-ci] Re: [PATCH compass-ci] doc: optimize os_mount.md

这样描述清楚多了。

• check_src_lv()
• {
• lvdisplay $1 > /dev/null || exit 1

exit 1 => exit

一般使用原始命令的exit code

• }
• clone_boot_lv_from_src_lv()
• {
• src_lv=$1
• boot_lv=$2

src_lv == boot_lv 的情况下，需要跳过，直接返回

• lvremove -f ${boot_lv}

-f => --force 描述更清楚点

• lvcreate ${boot_lv} from ${src_lv} || exit 1

from => --snapshot 这里可以使用原始命令选项，不长，而且更清晰明了

• }
• no_save_no_use()
• {
• src_lv="/dev/mapper/os-openeuler_aarch64_20.03_${timestamp}"
• boot_lv="/dev/mapper/os-openeuler_aarch64_20.03"
• copy_nfsroot_to_src_lv ${src_lv}

copy_nfsroot_to_src_lv => rsync_to

• clone_boot_lv_from_src_lv ${src_lv} ${boot_lv}

clone_boot_lv_from_src_lv => snapshot_to

• boot_from_lv ${boot_lv}
• }
• only_save()
• {
• src_lv="/dev/mapper/os-openeuler_aarch64_20.03_${timestamp}"
• boot_lv="/dev/mapper/os-openeuler_aarch64_20.03_${save_root_partition}"
• copy_nfsroot_to_src_lv ${src_lv}
• clone_boot_lv_from_src_lv ${src_lv} ${boot_lv}
• boot_from_lv ${boot_lv}
• }
• only_use()
• {
• src_lv="/dev/mapper/os-openeuler_aarch64_20.03_${use_root_partition}"
• boot_lv="/dev/mapper/os-openeuler_aarch64_20.03"
• check_src_lv ${src_lv}
• clone_boot_lv_from_src_lv ${src_lv} ${boot_lv}
• boot_from_lv ${boot_lv}
• }
• save_and_use()
• {
• src_lv="/dev/mapper/os-openeuler_aarch64_20.03_${use_root_partition}"
• boot_lv="/dev/mapper/os-openeuler_aarch64_20.03_${save_root_partition}"
• check_src_lv ${src_lv}
• clone_boot_lv_from_src_lv ${src_lv} ${boot_lv}
• boot_from_lv ${boot_lv}
• }
• main()
• {
• [ -z ${use_root_partition} ] && [ -z ${save_root_partition} ] && no_save_no_use
• [ -z ${use_root_partition} ] && [ -n ${save_root_partition} ] && only_save
• [ -n ${use_root_partition} ] && [ -z ${save_root_partition} ] && only_use
• [ -n ${use_root_partition} ] && [ -n ${save_root_partition} ] && save_and_use

clone_boot_lv_from_src_lv ${src_lv} ${boot_lv} boot_lv ${boot_lv}

都是公共行为，可以放这里来

• }
• main()

4. execute the job

-- 2.23.0