aboutsummaryrefslogtreecommitdiffstats
path: root/sdc-os-chef/scripts/k8s/get_helm.sh
blob: 79e9f3520351514032cf686be38f7a000d31e449 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
#!/usr/bin/env bash

# Copyright 2016 The Kubernetes Authors All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# The install script is based off of the MIT-licensed script from glide,
# the package manager for Go: https://github.com/Masterminds/glide.sh/blob/master/get

PROJECT_NAME="helm"

: ${HELM_INSTALL_DIR:="/usr/local/bin"}

# initArch discovers the architecture for this system.
initArch() {
  ARCH=$(uname -m)
  case $ARCH in
    armv5*) ARCH="armv5";;
    armv6*) ARCH="armv6";;
    armv7*) ARCH="armv7";;
    aarch64) ARCH="arm64";;
    x86) ARCH="386";;
    x86_64) ARCH="amd64";;
    i686) ARCH="386";;
    i386) ARCH="386";;
  esac
}

# initOS discovers the operating system for this system.
initOS() {
  OS=$(echo `uname`|tr '[:upper:]' '[:lower:]')

  case "$OS" in
    # Minimalist GNU for Windows
    mingw*) OS='windows';;
  esac
}

# runs the given command as root (detects if we are root already)
runAsRoot() {
  local CMD="$*"
  
  if [ $EUID -ne 0 ]; then
    CMD="sudo $CMD"
  fi
  
  $CMD
}

# verifySupported checks that the os/arch combination is supported for
# binary builds.
verifySupported() {
  local supported="darwin-386\ndarwin-amd64\nlinux-386\nlinux-amd64\nlinux-arm\nlinux-arm64\nlinux-ppc64le\nwindows-386\nwindows-amd64"
  if ! echo "${supported}" | grep -q "${OS}-${ARCH}"; then
    echo "No prebuilt binary for ${OS}-${ARCH}."
    echo "To build from source, go to https://github.com/kubernetes/helm"
    exit 1
  fi

  if ! type "curl" > /dev/null && ! type "wget" > /dev/null; then
    echo "Either curl or wget is required"
    exit 1
  fi
}

# checkDesiredVersion checks if the desired version is available.
checkDesiredVersion() {
  # Use the GitHub releases webpage for the project to find the desired version for this project.
  local release_url="https://github.com/kubernetes/helm/releases/${DESIRED_VERSION:-latest}"
  if type "curl" > /dev/null; then
    TAG=$(curl -SsL $release_url | awk '/\/tag\//' | cut -d '"' -f 2 | awk '{n=split($NF,a,"/");print a[n]}' | awk 'a !~ $0{print}; {a=$0}')
  elif type "wget" > /dev/null; then
    TAG=$(wget -q -O - $release_url | awk '/\/tag\//' | cut -d '"' -f 2 | awk '{n=split($NF,a,"/");print a[n]}' | awk 'a !~ $0{print}; {a=$0}')
  fi
  if [ "x$TAG" == "x" ]; then
    echo "Cannot determine ${DESIRED_VERSION} tag."
    exit 1
  fi
}

# checkHelmInstalledVersion checks which version of helm is installed and
# if it needs to be changed.
checkHelmInstalledVersion() {
  if [[ -f "${HELM_INSTALL_DIR}/${PROJECT_NAME}" ]]; then
    local version=$(helm version | grep '^Client' | cut -d'"' -f2)
    if [[ "$version" == "$TAG" ]]; then
      echo "Helm ${version} is already ${DESIRED_VERSION:-latest}"
      return 0
    else
      echo "Helm ${TAG} is available. Changing from version ${version}."
      return 1
    fi
  else
    return 1
  fi
}

# downloadFile downloads the latest binary package and also the checksum
# for that binary.
downloadFile() {
  HELM_DIST="helm-$TAG-$OS-$ARCH.tar.gz"
  DOWNLOAD_URL="https://kubernetes-helm.storage.googleapis.com/$HELM_DIST"
  CHECKSUM_URL="$DOWNLOAD_URL.sha256"
  HELM_TMP_ROOT="$(mktemp -dt helm-installer-XXXXXX)"
  HELM_TMP_FILE="$HELM_TMP_ROOT/$HELM_DIST"
  HELM_SUM_FILE="$HELM_TMP_ROOT/$HELM_DIST.sha256"
  echo "Downloading $DOWNLOAD_URL"
  if type "curl" > /dev/null; then
    curl -SsL "$CHECKSUM_URL" -o "$HELM_SUM_FILE"
  elif type "wget" > /dev/null; then
    wget -q -O "$HELM_SUM_FILE" "$CHECKSUM_URL"
  fi
  if type "curl" > /dev/null; then
    curl -SsL "$DOWNLOAD_URL" -o "$HELM_TMP_FILE"
  elif type "wget" > /dev/null; then
    wget -q -O "$HELM_TMP_FILE" "$DOWNLOAD_URL"
  fi
}

# installFile verifies the SHA256 for the file, then unpacks and
# installs it.
installFile() {
  HELM_TMP="$HELM_TMP_ROOT/$PROJECT_NAME"
  local sum=$(openssl sha1 -sha256 ${HELM_TMP_FILE} | awk '{print $2}')
  local expected_sum=$(cat ${HELM_SUM_FILE})
  if [ "$sum" != "$expected_sum" ]; then
    echo "SHA sum of $HELM_TMP does not match. Aborting."
    exit 1
  fi

  mkdir -p "$HELM_TMP"
  tar xf "$HELM_TMP_FILE" -C "$HELM_TMP"
  HELM_TMP_BIN="$HELM_TMP/$OS-$ARCH/$PROJECT_NAME"
  echo "Preparing to install into ${HELM_INSTALL_DIR}"
  runAsRoot cp "$HELM_TMP_BIN" "$HELM_INSTALL_DIR"
}

# fail_trap is executed if an error occurs.
fail_trap() {
  result=$?
  if [ "$result" != "0" ]; then
    if [[ -n "$INPUT_ARGUMENTS" ]]; then
      echo "Failed to install $PROJECT_NAME with the arguments provided: $INPUT_ARGUMENTS"
      help
    else
      echo "Failed to install $PROJECT_NAME"
    fi
    echo -e "\tFor support, go to https://github.com/kubernetes/helm."
  fi
  cleanup
  exit $result
}

# testVersion tests the installed client to make sure it is working.
testVersion() {
  set +e
  echo "$PROJECT_NAME installed into $HELM_INSTALL_DIR/$PROJECT_NAME"
  HELM="$(which $PROJECT_NAME)"
  if [ "$?" = "1" ]; then
    echo "$PROJECT_NAME not found. Is $HELM_INSTALL_DIR on your "'$PATH?'
    exit 1
  fi
  set -e
  echo "Run '$PROJECT_NAME init' to configure $PROJECT_NAME."
}

# help provides possible cli installation arguments
help () {
  echo "Accepted cli arguments are:"
  echo -e "\t[--help|-h ] ->> prints this help"
  echo -e "\t[--version|-v <desired_version>] . When not defined it defaults to latest"
  echo -e "\te.g. --version v2.4.0  or -v latest"
}

# cleanup temporary files to avoid https://github.com/kubernetes/helm/issues/2977
cleanup() {
  rm -rf "$HELM_TMP_ROOT"
}

# Execution

#Stop execution on any error
trap "fail_trap" EXIT
set -e

# Parsing input arguments (if any)
export INPUT_ARGUMENTS="${@}"
set -u
while [[ $# -gt 0 ]]; do
  case $1 in
    '--version'|-v)
       shift
       if [[ $# -ne 0 ]]; then
           export DESIRED_VERSION="${1}"
       else
           echo -e "Please provide the desired version. e.g. --version v2.4.0 or -v latest"
           exit 0
       fi
       ;;
    '--help'|-h)
       help
       exit 0
       ;;
    *) exit 1
       ;;
  esac
  shift
done
set +u

initArch
initOS
verifySupported
checkDesiredVersion
if ! checkHelmInstalledVersion; then
  downloadFile
  installFile
fi
testVersion
cleanup