287e604a8f
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)
49 lines
1.4 KiB
Bash
Executable file
49 lines
1.4 KiB
Bash
Executable file
#!/usr/bin/env bash
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# Generate a very minimal filesystem based on busybox-static,
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# and load it into the local docker under the name "docker-ut".
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missing_pkg() {
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echo "Sorry, I could not locate $1"
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echo "Try 'apt-get install ${2:-$1}'?"
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exit 1
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}
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BUSYBOX=$(which busybox)
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[ "$BUSYBOX" ] || missing_pkg busybox busybox-static
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SOCAT=$(which socat)
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[ "$SOCAT" ] || missing_pkg socat
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shopt -s extglob
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set -ex
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ROOTFS=`mktemp -d ${TMPDIR:-/var/tmp}/rootfs-busybox.XXXXXXXXXX`
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trap "rm -rf $ROOTFS" INT QUIT TERM
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cd $ROOTFS
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mkdir bin etc dev dev/pts lib proc sys tmp
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touch etc/resolv.conf
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cp /etc/nsswitch.conf etc/nsswitch.conf
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echo root:x:0:0:root:/:/bin/sh > etc/passwd
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echo daemon:x:1:1:daemon:/usr/sbin:/bin/sh >> etc/passwd
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echo root:x:0: > etc/group
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echo daemon:x:1: >> etc/group
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ln -s lib lib64
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ln -s bin sbin
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cp $BUSYBOX $SOCAT bin
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for X in $(busybox --list)
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do
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ln -s busybox bin/$X
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done
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rm bin/init
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ln bin/busybox bin/init
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cp -P /lib/x86_64-linux-gnu/lib{pthread*,c*(-*),dl*(-*),nsl*(-*),nss_*,util*(-*),wrap,z}.so* lib
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cp /lib/x86_64-linux-gnu/ld-linux-x86-64.so.2 lib
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cp -P /usr/lib/x86_64-linux-gnu/lib{crypto,ssl}.so* lib
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for X in console null ptmx random stdin stdout stderr tty urandom zero
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do
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cp -a /dev/$X dev
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done
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chmod 0755 $ROOTFS # See #486
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tar --numeric-owner -cf- . | docker import - docker-ut
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docker run -i -u root docker-ut /bin/echo Success.
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rm -rf $ROOTFS
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