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https://github.com/linuxkit/linuxkit.git
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75 lines
1.7 KiB
Bash
Executable File
75 lines
1.7 KiB
Bash
Executable File
#!/bin/sh
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infinite_loop() {
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while true; do
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$@
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done
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}
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# run getty on all known consoles
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start_getty() {
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tty=${1%,*}
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speed=${1#*,}
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securetty="$2"
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line=
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term="linux"
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[ "$speed" = "$1" ] && speed=115200
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# does the device even exist?
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if [ ! -c /dev/$tty ]; then
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echo "getty: cmdline has console=$tty but /dev/$tty is not a character device; not starting getty for $tty" | tee /dev/console
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return
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fi
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case "$tty" in
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ttyS*|ttyAMA*|ttyUSB*|ttyMFD*)
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line="-L"
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term="vt100"
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;;
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tty?)
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line=""
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speed="38400"
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term=""
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;;
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esac
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# are we secure or insecure?
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loginargs=
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if [ "$INSECURE" == "true" ]; then
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loginargs="-a root"
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fi
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if ! grep -q -w "$tty" "$securetty"; then
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# we could not find the tty in securetty, so start a getty but warn that root login will not work
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echo "getty: cmdline has console=$tty but does not exist in $securetty; will not be able to log in as root on this tty $tty." | tee /dev/$tty
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fi
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# respawn forever
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infinite_loop setsid.getty -w /sbin/agetty $loginargs $line $speed $tty $term &
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}
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# check if we are namespaced, and, if so, indicate in the PS1
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if [ -z "$INITGETTY" ]; then
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cat >/etc/profile.d/namespace.sh <<"EOF"
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export PS1="(ns: getty) $PS1"
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EOF
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fi
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# check if we have /etc/getty.shadow
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ROOTSHADOW=/hostroot/etc/getty.shadow
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if [ -f $ROOTSHADOW ]; then
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cp $ROOTSHADOW /etc/shadow
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# just in case someone forgot a newline
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echo >> /etc/shadow
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fi
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for opt in $(cat /proc/cmdline); do
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case "$opt" in
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console=*)
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start_getty ${opt#console=} /etc/securetty
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esac
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done
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# if we are in a container (not in root init) wait for all our child process to exit; tini will handle subreaping, if necessary
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[ -z "$INITGETTY" ] && wait
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