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https://github.com/linuxkit/linuxkit.git
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73e30a757f
- this needs improvements to make it more "platform native", in particular GCP supports multiple users and more ssh key mangement options. - at present you can login as root with any platform ssh key - add support for uts=host and ipc=host - set the hostname from the metadata as well Signed-off-by: Justin Cormack <justin.cormack@docker.com>
63 lines
2.2 KiB
Bash
Executable File
63 lines
2.2 KiB
Bash
Executable File
#!/bin/sh
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set -e
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# arguments are image name, prefix, then arguments passed to Docker
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# eg ./riddler.sh alpine:3.4 / --read-only alpine:3.4 ls
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# This script will output a tarball under prefix/ with rootfs and config.json
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IMAGE="$1"; shift
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PREFIX="$1"; shift
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cd /tmp
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mkdir -p /tmp/$PREFIX
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cd /tmp/$PREFIX
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# riddler always adds the apparmor options if this is not present
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EXTRA_OPTIONS="--security-opt apparmor=unconfined"
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ARGS="$@"
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CONTAINER=$(docker create $EXTRA_OPTIONS $ARGS)
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riddler $CONTAINER > /dev/null
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docker rm $CONTAINER > /dev/null
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# unfixed known issues
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# noNewPrivileges is always set by riddler, but that is fine for our use cases
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# These fixes should be removed when riddler is fixed
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# process.rlimits, just a constant at present, not useful
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# memory swappiness is too big by default
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# remove user namespaces
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# --read-only sets /dev ro
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# /sysfs ro unless privileged - cannot detect so will do if grant all caps
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# ipc, uts namespaces always isolated
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UTS="."
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IPC="."
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echo $ARGS | grep -q uts=host && UTS=".linux.namespaces = (.linux.namespaces|map(select(.type!=\"uts\")))"
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echo $ARGS | grep -q ipc=host && IPC=".linux.namespaces = (.linux.namespaces|map(select(.type!=\"ipc\")))"
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mv config.json config.json.orig
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cat config.json.orig | \
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jq "$UTS" | \
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jq "$IPC" | \
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jq 'del(.process.rlimits)' | \
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jq 'del (.linux.resources.memory.swappiness)' | \
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jq 'del(.linux.uidMappings) | del(.linux.gidMappings) | .linux.namespaces = (.linux.namespaces|map(select(.type!="user")))' | \
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jq 'if .root.readonly==true then .mounts = (.mounts|map(if .destination=="/dev" then .options |= .+ ["ro"] else . end)) else . end' | \
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jq '.mounts = if .process.capabilities | length != 38 then (.mounts|map(if .destination=="/sys" then .options |= .+ ["ro"] else . end)) else . end' \
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> config.json
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rm config.json.orig
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# extract rootfs
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EXCLUDE="--exclude .dockerenv --exclude Dockerfile \
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--exclude dev/console --exclude dev/pts --exclude dev/shm \
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--exclude etc/hostname --exclude etc/hosts --exclude etc/mtab --exclude etc/resolv.conf"
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mkdir -p rootfs
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CONTAINER="$(docker create $IMAGE /dev/null)"
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docker export "$CONTAINER" | tar -xf - -C rootfs $EXCLUDE
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docker rm "$CONTAINER" > /dev/null
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cd /tmp
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tar cf - .
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