github.com/circular-dark/docker@v1.7.0/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] 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  optTemp=$(getopt --options '+d:t:h' --longoptions 'dir:,tag:,help' --name "$mkimg" -- "$@")
    20  eval set -- "$optTemp"
    21  unset optTemp
    22  
    23  dir=
    24  tag=
    25  while true; do
    26  	case "$1" in
    27  		-d|--dir) dir="$2" ; shift 2 ;;
    28  		-t|--tag) tag="$2" ; shift 2 ;;
    29  		-h|--help) usage ;;
    30  		--) shift ; break ;;
    31  	esac
    32  done
    33  
    34  script="$1"
    35  [ "$script" ] || usage
    36  shift
    37  
    38  if [ ! -x "$scriptDir/$script" ]; then
    39  	echo >&2 "error: $script does not exist or is not executable"
    40  	echo >&2 "  see $scriptDir for possible scripts"
    41  	exit 1
    42  fi
    43  
    44  # don't mistake common scripts like .febootstrap-minimize as image-creators
    45  if [[ "$script" == .* ]]; then
    46  	echo >&2 "error: $script is a script helper, not a script"
    47  	echo >&2 "  see $scriptDir for possible scripts"
    48  	exit 1
    49  fi
    50  
    51  delDir=
    52  if [ -z "$dir" ]; then
    53  	dir="$(mktemp -d ${TMPDIR:-/var/tmp}/docker-mkimage.XXXXXXXXXX)"
    54  	delDir=1
    55  fi
    56  
    57  rootfsDir="$dir/rootfs"
    58  ( set -x; mkdir -p "$rootfsDir" )
    59  
    60  # pass all remaining arguments to $script
    61  "$scriptDir/$script" "$rootfsDir" "$@"
    62  
    63  # Docker mounts tmpfs at /dev and procfs at /proc so we can remove them
    64  rm -rf "$rootfsDir/dev" "$rootfsDir/proc"
    65  mkdir -p "$rootfsDir/dev" "$rootfsDir/proc"
    66  
    67  # make sure /etc/resolv.conf has something useful in it
    68  mkdir -p "$rootfsDir/etc"
    69  cat > "$rootfsDir/etc/resolv.conf" <<'EOF'
    70  nameserver 8.8.8.8
    71  nameserver 8.8.4.4
    72  EOF
    73  
    74  tarFile="$dir/rootfs.tar.xz"
    75  touch "$tarFile"
    76  
    77  (
    78  	set -x
    79  	tar --numeric-owner -caf "$tarFile" -C "$rootfsDir" --transform='s,^./,,' .
    80  )
    81  
    82  echo >&2 "+ cat > '$dir/Dockerfile'"
    83  cat > "$dir/Dockerfile" <<'EOF'
    84  FROM scratch
    85  ADD rootfs.tar.xz /
    86  EOF
    87  
    88  # if our generated image has a decent shell, let's set a default command
    89  for shell in /bin/bash /usr/bin/fish /usr/bin/zsh /bin/sh; do
    90  	if [ -x "$rootfsDir/$shell" ]; then
    91  		( set -x; echo 'CMD ["'"$shell"'"]' >> "$dir/Dockerfile" )
    92  		break
    93  	fi
    94  done
    95  
    96  ( set -x; rm -rf "$rootfsDir" )
    97  
    98  if [ "$tag" ]; then
    99  	( set -x; docker build -t "$tag" "$dir" )
   100  elif [ "$delDir" ]; then
   101  	# 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_
   102  	( set -x; docker build "$dir" )
   103  fi
   104  
   105  if [ "$delDir" ]; then
   106  	( set -x; rm -rf "$dir" )
   107  fi