40 lines
1008 B
Bash
40 lines
1008 B
Bash
#!/bin/sh
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ROOTFS=`mktemp -d rootfs.XXX -t`
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TMPDIR=/tmp
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TARBALL=alpine-minirootfs-3.9.0-x86_64.tar.gz
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URL=http://dl-cdn.alpinelinux.org/alpine/v3.9/releases/x86_64/$TARBALL
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[ "$URL" ] && wget -c $URL
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mkdir $ROOTFS
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# 1. create rootfs
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tar xf $TARBALL -C $ROOTFS/ \
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./etc/os-release ./usr ./lib ./bin ./sbin
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# 2. create mount points
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mkdir -p $ROOTFS/etc/systemd/system $ROOTFS/var/{lib,run,tmp} $ROOTFS/{dev,proc,sys,tmp,run,root}
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touch $ROOTFS/etc/machine-id $ROOTFS/etc/resolv.conf
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# 3. simple service unit
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cat <<EOF > $ROOTFS/etc/systemd/system/simple.service
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[Unit]
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Description=Simple portable test service
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[Service]
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Type=exec
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ExecStart=/bin/sh -c 'while /bin/sleep 5; do echo ping; done'
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EOF
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# 4. create a read-only squashfs rootfs image
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mksquashfs $ROOTFS $TMPDIR/simple.raw -all-root -noappend
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# 5. attach and start the service
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sudo portablectl attach $TMPDIR/simple.raw
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sudo systemctl start simple-test
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# 6. undo
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#sudo systemctl stop simple-test
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#sudo portablectl detach $TMPDIR/simple.raw
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