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249
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1 #!/bin/bash
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2 set -e
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3
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4 # first arg is `-f` or `--some-option`
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5 if [ "${1#-}" != "$1" ]; then
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6 set -- docker "$@"
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7 fi
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8
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9 # if our command is a valid Docker subcommand, let's invoke it through Docker instead
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10 # (this allows for "docker run docker ps", etc)
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11 if docker help "$1" > /dev/null 2>&1; then
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12 set -- docker "$@"
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13 fi
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14
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15 # if we have "--link some-docker:docker" and not DOCKER_HOST, let's set DOCKER_HOST automatically
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16 if [ -z "$DOCKER_HOST" -a "$DOCKER_PORT_2375_TCP" ]; then
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17 export DOCKER_HOST='tcp://docker:2375'
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18 fi
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19
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20 if [ "$1" = 'dockerd' ]; then
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21 cat >&2 <<-'EOW'
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22 📎 Hey there! It looks like you're trying to run a Docker daemon.
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23 You probably should use the "dind" image variant instead, something like:
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24 docker run --privileged --name some-overlay-docker -d docker:stable-dind --storage-driver=overlay
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25 See https://hub.docker.com/_/docker/ for more documentation and usage examples.
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26 EOW
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27 sleep 3
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28 fi
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29
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30 exec "$@"
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