1、报错信息如下
[root@localhost mkinitrd]# xz -dc initrd.img | cpio -id
cpio: usr/bin: Cannot symlink to ‘bin’: Operation not permitted
cpio: dev/console: Cannot mknod: Operation not permitted
cpio: dev/kmsg: Cannot mknod: Operation not permitted
cpio: dev/null: Cannot mknod: Operation not permitted
cpio: dev/random: Cannot mknod: Operation not permitted
cpio: dev/urandom: Cannot mknod: Operation not permitted
cpio: ../usr/lib/initrd-release: Cannot symlink to ‘etc/initrd-release’: Operation not permitted
cpio: /proc/self/mounts: Cannot symlink to ‘etc/mtab’: Operation not permitted
cpio: initrd-release: Cannot symlink to ‘etc/os-release’: Operation not permitted
cpio: ../../ca-trust/extracted/pem/tls-ca-bundle.pem: Cannot symlink to ‘etc/pki/tls/certs/ca-bundle.crt’: Operation not permitted
cpio: centos-release: Cannot symlink to ‘etc/system-release’: Operation not permitted
cpio: usr/lib/systemd/systemd: Cannot symlink to ‘init’: Operation not permitted
cpio: usr/lib: Cannot symlink to ‘lib’: Operation not permitted
cpio: usr/lib64: Cannot symlink to ‘lib64’: Operation not permitted
cpio: usr/sbin: Cannot symlink to ‘sbin’: Operation not permitted
cpio: gawk: Cannot symlink to ‘usr/bin/awk’: Operation not permitted
cpio: true: Cannot symlink to ‘usr/bin/loginctl’: Operation not permitted
cpio: bash: Cannot symlink to ‘usr/bin/sh’: Operation not permitted
cpio: t4fw-1.24.3.0.bin: Cannot symlink to ‘usr/lib/firmware/cxgb4/t4fw.bin’: Operation not permitted
cpio: t5fw-1.24.3.0.bin: Cannot symlink to ‘usr/lib/firmware/cxgb4/t5fw.bin’: Operation not permitted
cpio: t6fw-1.24.3.0.bin: Cannot symlink to ‘usr/lib/firmware/cxgb4/t6fw.bin’: Operation not permitted
cpio: ice-1.3.4.0.pkg: Cannot symlink to ‘usr/lib/firmware/intel/ice/ddp/ice.pkg’: Operation not permitted
cpio: nic/nic_AMDA0058-0011_2x40.nffw: Cannot symlink to ‘usr/lib/firmware/netronome/nic_AMDA0058-0011_2x40.nffw’: Operation not permitted
cpio: nic/nic_AMDA0058-0012_2x40.nffw: Cannot symlink to ‘usr/lib/firmware/netronome/nic_AMDA0058-0012_2x40.nffw’: Operation not permitted
cpio: nic/nic_AMDA0081-0001_1x40.nffw: Cannot symlink to ‘usr/lib/firmware/netronome/nic_AMDA0081-0001_1x40.nffw’: Operation not permitted
2、解决方式
I just realized the reason these links failed was because my USB stick was in vfat format and that doesn’t support symbolic links. As always, user error.
即不支持的磁盘格式，目前测试通过ext4格式进行解压缩就不会报错了
插入U盘7.5G
[root@localhost mkinitrd]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 20G 0 disk
├─sda1 8:1 0 1G 0 part /boot
└─sda2 8:2 0 19G 0 part
├─cl-root 253:0 0 17G 0 lvm /
└─cl-swap 253:1 0 2G 0 lvm [SWAP]
sdc 8:32 1 7.5G 0 disk
[root@localhost mkinitrd]# mkfs.ext4 /dev/sdc
[root@localhost mkinitrd]# mkdir sandisk && mount /dev/sdc sandisk/
[root@localhost mkinitrd]# blkid /dev/sdc
/dev/sdc: UUID="175f5de9-f82f-4138-8423-f738d4a21f2c" BLOCK_SIZE="4096" TYPE="ext4"
[root@localhost mkinitrd]# cp initrd.img sandisk/
[root@localhost mkinitrd]# cd sandisk/
[root@localhost sandisk]# xz -dc initrd.img | cpio -id
3、参考
cpio complains when unpacking initrd.img