2019-08-13
xbps bug results in missing /bin/sh
Due to a bug in xbps there was an issue this morning where /bin/sh disappeared after an update.
The bug was fixed quickly, but there’s a 2h window where an update may have resulted in a broken system.
If you’re affected by this issue you may experience error messages like these during boot:
runit: fatal: unable to start child: /etc/runit/1 file does not exist
These are the steps to recover your system:
Case 1: System is still running and you have a working shell open
Run the following command as root:
# xbps-install -Su
Afterwards your system should update xbps and recreate /bin/sh
Case 2: System has rebooted or no shell is opened anymore
Restart your system
GNU GRUB version 2.02
┌────────────────────────────────────────────────────────────────────────────┐
│*Void GNU/Linux │
│ Advanced options for Void GNU/Linux │
│ │
│ │
│ │
│ │
│ │
│ │
│ │
│ │
│ │
│ │
│ │
└────────────────────────────────────────────────────────────────────────────┘
Use the ↑ and ↓ keys to select which entry is highlighted.
Press enter to boot the selected OS, `e' to edit the commands
before booting or `c' for a command-line.
Once grub comes up, select the kernel you want to boot and press E.
GNU GRUB version 2.02
┌────────────────────────────────────────────────────────────────────────────┐
│ search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --\│↑
│hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 XXXXXXXX-XXXX-XXXX-XXXX-\│
│XXXXXXXXXXXX │
│ else │
│ search --no-floppy --fs-uuid --set=root XXXXXXXX-XXXX-XXXX-XXXX-X\│
│XXXXXXXXXXX │
│ fi │
│ echo 'Loading Linux 4.19.15_1 ...' │
│ linux /boot/vmlinuz-4.19.15_1 ro loglevel=4 slub_debug=P pa\│
│ge_poison=1 rd.break │
│ echo 'Loading initial ramdisk ...' │
│ initrd /boot/initramfs-4.19.15_1.img │
│ │
└────────────────────────────────────────────────────────────────────────────┘
Minimum Emacs-like screen editing is supported. TAB lists
completions. Press Ctrl-x or F10 to boot, Ctrl-c or F2 for
a command-line or ESC to discard edits and return to the GRUB menu.
find the line that starts with linux /boot/... and add rd.break at the end of the line.
Make sure it is seperated with a space from the rest of the line
Afterwards Press Ctrl + X to boot the configuration.
Dropping to debug shell.
dracut:/#
Once you’ve got a shell execute the following commands:
dracut:/# mount -o remount,rw /sysroot
dracut:/# chroot /sysroot xbps-alternatives -s bash
dracut:/# exit
Afterwards the system should work as expected.
Please use xbps-install -Su to fetch the newest xbps version that fixes this bug.
If it doesn’t help
Join over on #voidlinux in freenode or ask on reddit.