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73 lines
1.8 KiB
Bash
73 lines
1.8 KiB
Bash
#!/bin/bash
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## @author gdm85
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##
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## build a base Ubuntu image, can be Trusty, Wily etc
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#
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BASENAME=$(dirname $(readlink -m $0))
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## the distro we are going to use
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REPOSRC=http://archive.ubuntu.com/ubuntu/
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if [ ! $UID -eq 0 ]; then
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echo "This script can only be run as root" 1>&2
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exit 1
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fi
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if [ ! $# -eq 1 ]; then
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echo "Usage: build-ubuntu-image.sh release-name" 1>&2
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exit 2
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fi
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DISTNAME="$1"
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## check for prerequisites
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if ! type -P debootstrap >/dev/null; then
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echo "You need to install debootstrap" 1>&2
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exit 2
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fi
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## check about the Ubuntu archive keyring
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DEFK=/usr/share/keyrings/ubuntu-archive-keyring.gpg
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KEYRING=$BASENAME/../keyrings/ubuntu-archive-keyring.gpg
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if [ -s $DEFK ]; then
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if ! diff $DEFK $KEYRING; then
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ANSWER=
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while [[ "$ANSWER" != "Y" && "$ANSWER" != "n" ]]; do
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echo -n "The Ubuntu Archive keyring in your system ($DEFK) that will be used to debootstrap is different from the reference provided keyring. Continue? (Y/n) "
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read -r ANSWER || exit $?
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done
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if [[ "$ANSWER" == "n" ]]; then
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exit 1
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fi
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## use system's keyring, even if different than provided one
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## this is a no-issue only in case the system's keyring is more recent than the provided one
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KEYRING=$DEFK
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fi
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else
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ANSWER=
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while [[ "$ANSWER" != "Y" && "$ANSWER" != "n" ]]; do
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echo -n "Your system comes with no Ubuntu Archive keyring in $DEFK that is necessary for debootstrap. Use reference provided keyring? (Y/n) "
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read -r ANSWER || exit $?
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done
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if [[ "$ANSWER" == "n" ]]; then
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exit 1
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fi
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fi
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echo "Will use $KEYRING"
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## NOTE: a temporary directory under /tmp is not used because can't be mounted dev/exec
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mkdir $DISTNAME || exit $?
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TMPDIR=$PWD/$DISTNAME
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debootstrap --keyring=$KEYRING $DISTNAME $DISTNAME $REPOSRC && \
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cd $DISTNAME && \
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tar -c . | docker import - gdm85/$DISTNAME
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RV=$?
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# always perform cleanup
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rm -rf $TMPDIR
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exit $RV
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