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moby--moby/contrib/mkimage-unittest.sh
Vincent Bernat 287e604a8f mkimage: use /var/tmp by default instead of /tmp
Additionally, this can be overridden by setting the TMPDIR variable,
like this was already the case for the generic `mkimage.sh` script.

As explained in #6456, the rationale to use `/var/tmp` instead of `/tmp`
is that `/tmp` is often a small tmpfs filesystem with more restricted
rights.

Docker-DCO-1.1-Signed-off-by: Vincent Bernat <vincent@bernat.im> (github: vincentbernat)
2014-06-27 14:43:12 +02:00

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#!/usr/bin/env bash
# Generate a very minimal filesystem based on busybox-static,
# and load it into the local docker under the name "docker-ut".
missing_pkg() {
echo "Sorry, I could not locate $1"
echo "Try 'apt-get install ${2:-$1}'?"
exit 1
}
BUSYBOX=$(which busybox)
[ "$BUSYBOX" ] || missing_pkg busybox busybox-static
SOCAT=$(which socat)
[ "$SOCAT" ] || missing_pkg socat
shopt -s extglob
set -ex
ROOTFS=`mktemp -d ${TMPDIR:-/var/tmp}/rootfs-busybox.XXXXXXXXXX`
trap "rm -rf $ROOTFS" INT QUIT TERM
cd $ROOTFS
mkdir bin etc dev dev/pts lib proc sys tmp
touch etc/resolv.conf
cp /etc/nsswitch.conf etc/nsswitch.conf
echo root:x:0:0:root:/:/bin/sh > etc/passwd
echo daemon:x:1:1:daemon:/usr/sbin:/bin/sh >> etc/passwd
echo root:x:0: > etc/group
echo daemon:x:1: >> etc/group
ln -s lib lib64
ln -s bin sbin
cp $BUSYBOX $SOCAT bin
for X in $(busybox --list)
do
ln -s busybox bin/$X
done
rm bin/init
ln bin/busybox bin/init
cp -P /lib/x86_64-linux-gnu/lib{pthread*,c*(-*),dl*(-*),nsl*(-*),nss_*,util*(-*),wrap,z}.so* lib
cp /lib/x86_64-linux-gnu/ld-linux-x86-64.so.2 lib
cp -P /usr/lib/x86_64-linux-gnu/lib{crypto,ssl}.so* lib
for X in console null ptmx random stdin stdout stderr tty urandom zero
do
cp -a /dev/$X dev
done
chmod 0755 $ROOTFS # See #486
tar --numeric-owner -cf- . | docker import - docker-ut
docker run -i -u root docker-ut /bin/echo Success.
rm -rf $ROOTFS