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20cfa2af2c
This was missed when things were renamed. The intention with this code was (apparently) to provide a (pseudo)unique hostname in the case where something more specific was not provided (e.g. by DHCP). Make this a little clearer by using '(none)' rather than 'linuxkit' as the default, in the normal case this will be overwritten by something more specific and if it isn't we will change it to something somewhat unique derived from the MAC address (as before). nb: '(none)' is already used by Debian so I think it is a safe choice as the sentinel value. The use of both CONFIG_DEFAULT_HOSTNAME and the explicit /etc/hostname from mkimage.sh is likely to be redundant in some cases, but neither seems to completely cover all cases so keep both. Signed-off-by: Ian Campbell <ian.campbell@docker.com>
47 lines
1.0 KiB
Bash
Executable File
47 lines
1.0 KiB
Bash
Executable File
#!/bin/sh
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set -e
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# arguments are image name
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# This script will output a tarball, suitable to be turned into a cpio archive
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# This is a bit hacky, should be improved later, as it hardcodes config.
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IMAGE="$1"; shift
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cd /tmp
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# extract rootfs
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EXCLUDE="--exclude .dockerenv --exclude Dockerfile \
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--exclude dev/console --exclude dev/pts --exclude dev/shm \
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--exclude etc/hostname --exclude etc/hosts --exclude etc/mtab --exclude etc/resolv.conf"
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CONTAINER="$(docker create $IMAGE /dev/null)"
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docker export "$CONTAINER" | tar -xf - $EXCLUDE
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docker rm "$CONTAINER" > /dev/null
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# these three files are bind mounted in by docker so they are not what we want
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mkdir -p etc
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cat << EOF > etc/hosts
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127.0.0.1 localhost
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::1 localhost ip6-localhost ip6-loopback
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fe00::0 ip6-localnet
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ff00::0 ip6-mcastprefix
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ff02::1 ip6-allnodes
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ff02::2 ip6-allrouters
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EOF
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cat << EOF > etc/resolv.conf
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nameserver 8.8.8.8
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nameserver 8.8.4.4
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nameserver 2001:4860:4860::8888
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nameserver 2001:4860:4860::8844
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EOF
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printf '(none)' > etc/hostname
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ln -s /proc/mounts etc/mtab
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tar cf - .
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