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https://github.com/kevingruesser/bootstrap-vz.git
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1e2fe02847
This change makes two fixes. First, it fixes a race condition on Debian 8 GCE instances which caused instances with >2TB disks to fail. Second, it adds the required "PREREQ" header to the script, which was previously missing and caused errors at build time. These two issues are somewhat unrelated to each other, but debugging the first led to finding the second.
77 lines
2.1 KiB
Bash
Executable file
77 lines
2.1 KiB
Bash
Executable file
# Selectively disable growroot -*- shell-script -*-
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set -e
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PREREQ=""
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prereqs()
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{
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echo "$PREREQ"
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}
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case $1 in
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prereqs)
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prereqs
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exit 0
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;;
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esac
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message() { echo "DISABLE-GROWROOT:" "$@" ; }
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error_exit() { message "$@"; exit 1; }
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. /scripts/functions
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# initramfs-tools exports the following variables, used below:
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# $ROOT - Generally "/dev/disk/by-uuid/<id>" which is a link to /dev/sda1
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# $ROOTFLAGS - Generally empty
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# $ROOTFSTYPE - Generally empty
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# $rootmnt - Set to "/root"
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# According to the initramfs documentation, it's supposed to wait until
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# the disks have been attached and verified before the local-premount scripts
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# run. This does not happen, however, and failures can happen below if $ROOT
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# is referenced before the disk that it points to is attached. This allows for
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# up to 4 seconds for that to happen. In practice, it generally takes less
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# than half a second.
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for i in $(seq 1 20); do
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if [ -e "${ROOT}" ]; then
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break
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fi
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sleep 0.2
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done
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# Follow link to get real root location
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if [ ! -L "${ROOT}" ]; then
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real_root=${ROOT}
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else
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real_root=$(readlink -f "${ROOT}")
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fi
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# Remove partition number to get disk
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disk=$(echo ${real_root} | sed 's/[0-9]*$//')
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# Determine number of 512-byte sectors in 2TB
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two_tb=$((2*(1024**4)))
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max_sectors=$((${two_tb}/512))
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# Determine number of sectors on disk
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geometry=$(sfdisk ${disk} --show-pt-geometry)
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cyl=$(echo $geometry | cut -d " " -f 2)
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heads=$(echo $geometry | cut -d " " -f 4)
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secs=$(echo $geometry | cut -d " " -f 6)
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sectors=$((${cyl}*${heads}*${secs}))
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# If disk is >2TB, disable growroot
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if [ "$sectors" -gt "$max_sectors" ]; then
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message "Disk size >2TB - Not expanding root partition"
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# Temporarily mount filesystem
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if [ -z "${ROOTFSTYPE}" ]; then
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fstype=$(get_fstype "${ROOT}")
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else
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fstype=${ROOTFSTYPE}
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fi
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mount -w ${fstype:+-t ${fstype} }${ROOTFLAGS} ${ROOT} ${rootmnt} ||
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error_exit "failed to mount ${ROOT}."
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# Disable growroot
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touch "${rootmnt}/etc/growroot-disabled"
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# Unmount filesystem
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umount "${rootmnt}" || error_exit "failed to umount ${rootmnt}";
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fi
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