github.com/docker/docker@v299999999.0.0-20200612211812-aaf470eca7b5+incompatible/contrib/mkimage.sh (about) 1 #!/usr/bin/env bash 2 set -e 3 4 mkimg="$(basename "$0")" 5 6 usage() { 7 echo >&2 "usage: $mkimg [-d dir] [-t tag] [--compression algo| --no-compression] script [script-args]" 8 echo >&2 " ie: $mkimg -t someuser/debian debootstrap --variant=minbase jessie" 9 echo >&2 " $mkimg -t someuser/ubuntu debootstrap --include=ubuntu-minimal --components=main,universe trusty" 10 echo >&2 " $mkimg -t someuser/busybox busybox-static" 11 echo >&2 " $mkimg -t someuser/centos:5 rinse --distribution centos-5" 12 echo >&2 " $mkimg -t someuser/mageia:4 mageia-urpmi --version=4" 13 echo >&2 " $mkimg -t someuser/mageia:4 mageia-urpmi --version=4 --mirror=http://somemirror/" 14 exit 1 15 } 16 17 scriptDir="$(dirname "$(readlink -f "$BASH_SOURCE")")/mkimage" 18 19 os= 20 os=$(uname -o) 21 22 optTemp=$(getopt --options '+d:t:c:hC' --longoptions 'dir:,tag:,compression:,no-compression,help' --name "$mkimg" -- "$@") 23 eval set -- "$optTemp" 24 unset optTemp 25 26 dir= 27 tag= 28 compression="auto" 29 while true; do 30 case "$1" in 31 -d | --dir) 32 dir="$2" 33 shift 2 34 ;; 35 -t | --tag) 36 tag="$2" 37 shift 2 38 ;; 39 --compression) 40 compression="$2" 41 shift 2 42 ;; 43 --no-compression) 44 compression="none" 45 shift 1 46 ;; 47 -h | --help) usage ;; 48 --) 49 shift 50 break 51 ;; 52 esac 53 done 54 55 script="$1" 56 [ "$script" ] || usage 57 shift 58 59 if [ "$compression" == 'auto' ] || [ -z "$compression" ]; then 60 compression='xz' 61 fi 62 63 [ "$compression" == 'none' ] && compression='' 64 65 if [ ! -x "$scriptDir/$script" ]; then 66 echo >&2 "error: $script does not exist or is not executable" 67 echo >&2 " see $scriptDir for possible scripts" 68 exit 1 69 fi 70 71 # don't mistake common scripts like .febootstrap-minimize as image-creators 72 if [[ "$script" == .* ]]; then 73 echo >&2 "error: $script is a script helper, not a script" 74 echo >&2 " see $scriptDir for possible scripts" 75 exit 1 76 fi 77 78 delDir= 79 if [ -z "$dir" ]; then 80 dir="$(mktemp -d ${TMPDIR:-/var/tmp}/docker-mkimage.XXXXXXXXXX)" 81 delDir=1 82 fi 83 84 rootfsDir="$dir/rootfs" 85 ( 86 set -x 87 mkdir -p "$rootfsDir" 88 ) 89 90 # pass all remaining arguments to $script 91 "$scriptDir/$script" "$rootfsDir" "$@" 92 93 # Docker mounts tmpfs at /dev and procfs at /proc so we can remove them 94 rm -rf "$rootfsDir/dev" "$rootfsDir/proc" 95 mkdir -p "$rootfsDir/dev" "$rootfsDir/proc" 96 97 # make sure /etc/resolv.conf has something useful in it 98 mkdir -p "$rootfsDir/etc" 99 cat > "$rootfsDir/etc/resolv.conf" << 'EOF' 100 nameserver 8.8.8.8 101 nameserver 8.8.4.4 102 EOF 103 104 tarFile="$dir/rootfs.tar${compression:+.$compression}" 105 touch "$tarFile" 106 107 ( 108 set -x 109 tar --numeric-owner --create --auto-compress --file "$tarFile" --directory "$rootfsDir" --transform='s,^./,,' . 110 ) 111 112 echo >&2 "+ cat > '$dir/Dockerfile'" 113 cat > "$dir/Dockerfile" << EOF 114 FROM scratch 115 ADD $(basename "$tarFile") / 116 EOF 117 118 # if our generated image has a decent shell, let's set a default command 119 for shell in /bin/bash /usr/bin/fish /usr/bin/zsh /bin/sh; do 120 if [ -x "$rootfsDir/$shell" ]; then 121 ( 122 set -x 123 echo 'CMD ["'"$shell"'"]' >> "$dir/Dockerfile" 124 ) 125 break 126 fi 127 done 128 129 ( 130 set -x 131 rm -rf "$rootfsDir" 132 ) 133 134 if [ "$tag" ]; then 135 ( 136 set -x 137 docker build -t "$tag" "$dir" 138 ) 139 elif [ "$delDir" ]; then 140 # if we didn't specify a tag and we're going to delete our dir, let's just build an untagged image so that we did _something_ 141 ( 142 set -x 143 docker build "$dir" 144 ) 145 fi 146 147 if [ "$delDir" ]; then 148 ( 149 set -x 150 rm -rf "$dir" 151 ) 152 fi