| #!/bin/sh |
| |
| # This script replaces the default busybox init process to avoid having that |
| # process staying alive and sleeping in the background, (uselessly) consuming |
| # precious memory. |
| |
| # Mount procfs and sysfs |
| /bin/mount -t proc proc /proc |
| /bin/mount -t sysfs sysfs /sys |
| |
| # When the kernel is directly booted, devtmpfs is not automatically mounted. |
| # Manually mount it if needed. |
| devmnt=$(mount | grep -c devtmpfs) |
| if [ "${devmnt}" -eq 0 ]; then |
| /bin/mount -t devtmpfs devtmpfs /dev |
| fi |
| |
| # Use the /dev/console device node from devtmpfs if possible to not |
| # confuse glibc's ttyname_r(). |
| # This may fail (E.G. booted with console=), and errors from exec will |
| # terminate the shell, so use a subshell for the test |
| if (exec 0</dev/console) 2>/dev/null; then |
| exec 0</dev/console |
| exec 1>/dev/console |
| exec 2>/dev/console |
| fi |
| |
| # Clear memory to reduce page fragmentation |
| echo 3 > /proc/sys/vm/drop_caches |
| |
| # Finally, let's start an interactive shell |
| exec /bin/sh |
