github.com/coreos/docker@v1.13.1/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  	echo >&2 "       $mkimg -t someuser/solaris solaris" 
    15  	exit 1
    16  }
    17  
    18  scriptDir="$(dirname "$(readlink -f "$BASH_SOURCE")")/mkimage"
    19  
    20  os=
    21  os=$(uname -o)
    22  
    23  # set up path to gnu tools if solaris
    24  [[ $os == "Solaris" ]] && export PATH=/usr/gnu/bin:$PATH 
    25  # TODO check for gnu-tar, gnu-getopt
    26  
    27  # TODO requires root/sudo due to some pkg operations. sigh.
    28  [[ $os == "Solaris" && $EUID != "0" ]] && echo >&2 "image create on Solaris requires superuser privilege"
    29  
    30  optTemp=$(getopt --options '+d:t:c:hC' --longoptions 'dir:,tag:,compression:,no-compression,help' --name "$mkimg" -- "$@")
    31  eval set -- "$optTemp"
    32  unset optTemp
    33  
    34  dir=
    35  tag=
    36  compression="auto"
    37  while true; do
    38  	case "$1" in
    39  		-d|--dir) dir="$2" ; shift 2 ;;
    40  		-t|--tag) tag="$2" ; shift 2 ;;
    41  		--compression)    compression="$2"   ; shift 2 ;;
    42  		--no-compression) compression="none" ; shift 1 ;;
    43  		-h|--help) usage ;;
    44  		--) shift ; break ;;
    45  	esac
    46  done
    47  
    48  script="$1"
    49  [ "$script" ] || usage
    50  shift
    51  
    52  if [ "$compression" == 'auto' ] || [ -z "$compression" ]
    53  then
    54      compression='xz'
    55  fi
    56  
    57  [ "$compression" == 'none' ] && compression=''
    58  
    59  if [ ! -x "$scriptDir/$script" ]; then
    60  	echo >&2 "error: $script does not exist or is not executable"
    61  	echo >&2 "  see $scriptDir for possible scripts"
    62  	exit 1
    63  fi
    64  
    65  # don't mistake common scripts like .febootstrap-minimize as image-creators
    66  if [[ "$script" == .* ]]; then
    67  	echo >&2 "error: $script is a script helper, not a script"
    68  	echo >&2 "  see $scriptDir for possible scripts"
    69  	exit 1
    70  fi
    71  
    72  delDir=
    73  if [ -z "$dir" ]; then
    74  	dir="$(mktemp -d ${TMPDIR:-/var/tmp}/docker-mkimage.XXXXXXXXXX)"
    75  	delDir=1
    76  fi
    77  
    78  rootfsDir="$dir/rootfs"
    79  ( set -x; mkdir -p "$rootfsDir" )
    80  
    81  # pass all remaining arguments to $script
    82  "$scriptDir/$script" "$rootfsDir" "$@"
    83  
    84  # Docker mounts tmpfs at /dev and procfs at /proc so we can remove them
    85  rm -rf "$rootfsDir/dev" "$rootfsDir/proc"
    86  mkdir -p "$rootfsDir/dev" "$rootfsDir/proc"
    87  
    88  # make sure /etc/resolv.conf has something useful in it
    89  mkdir -p "$rootfsDir/etc"
    90  cat > "$rootfsDir/etc/resolv.conf" <<'EOF'
    91  nameserver 8.8.8.8
    92  nameserver 8.8.4.4
    93  EOF
    94  
    95  tarFile="$dir/rootfs.tar${compression:+.$compression}"
    96  touch "$tarFile"
    97  
    98  (
    99  	set -x
   100  	tar --numeric-owner --create --auto-compress --file "$tarFile" --directory "$rootfsDir" --transform='s,^./,,' .
   101  )
   102  
   103  echo >&2 "+ cat > '$dir/Dockerfile'"
   104  cat > "$dir/Dockerfile" <<EOF
   105  FROM scratch
   106  ADD $(basename "$tarFile") /
   107  EOF
   108  
   109  # if our generated image has a decent shell, let's set a default command
   110  for shell in /bin/bash /usr/bin/fish /usr/bin/zsh /bin/sh; do
   111  	if [ -x "$rootfsDir/$shell" ]; then
   112  		( set -x; echo 'CMD ["'"$shell"'"]' >> "$dir/Dockerfile" )
   113  		break
   114  	fi
   115  done
   116  
   117  ( set -x; rm -rf "$rootfsDir" )
   118  
   119  if [ "$tag" ]; then
   120  	( set -x; docker build -t "$tag" "$dir" )
   121  elif [ "$delDir" ]; then
   122  	# if we didn't specify a tag and we're going to delete our dir, let's just build an untagged image so that we did _something_
   123  	( set -x; docker build "$dir" )
   124  fi
   125  
   126  if [ "$delDir" ]; then
   127  	( set -x; rm -rf "$dir" )
   128  fi