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This gist enables to build a minimal initramfs with a shell by relying on busybox. This only requires the busybox binary. The busybox binary must be statically linked (see https://gist.github.com/chrisdone/02e165a0004be33734ac2334f215380e).
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| #!/bin/sh | |
| mount -t proc none /proc | |
| mount -t sysfs none /sys | |
| echo -e "\nBoot took $(cut -d' ' -f1 /proc/uptime) seconds\n" | |
| setsid cttyhack sh | |
| exec /bin/sh |
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| dir /dev 755 0 0 | |
| nod /dev/console 644 0 0 c 5 1 | |
| dir /proc 755 0 0 | |
| dir /sys 755 0 0 | |
| nod /dev/hvc0 644 0 0 c 229 0 | |
| nod /dev/tty0 644 0 0 c 4 0 | |
| nod /dev/loop0 644 0 0 b 7 0 | |
| dir /bin 755 1000 1000 | |
| slink /bin/mount busybox 777 0 0 | |
| slink /bin/sh busybox 777 0 0 | |
| slink /bin/setsid busybox 777 0 0 | |
| slink /bin/cttyhack busybox 777 0 0 | |
| slink /bin/ls busybox 777 0 0 | |
| slink /bin/cut busybox 777 0 0 | |
| file /bin/busybox usr/initramfs/busybox 755 0 0 | |
| file /init usr/initramfs/init.sh 755 0 0 |
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