Support installing specific versions via script

install.ps1

@@ -41,20 +41,24 @@ if ([string]::IsNullOrEmpty($url)) {
     if($null -eq $version){
       $version = "latest"
     }
-    $releaseInfoUrl = "https://buildkite.com/agent/releases/$($version)?platform=windows&arch=$arch"
-    if($beta) {
-        $releaseInfoUrl = $releaseInfoUrl + "&prerelease=true"
+    if ($version -eq "latest") {
+      $releaseInfoUrl = "https://buildkite.com/agent/releases/$($version)?platform=windows&arch=$arch"
+      if($beta) {
+          $releaseInfoUrl = $releaseInfoUrl + "&prerelease=true"
+      }
+      Write-Host "Finding latest release"
+
+      $resp = Invoke-WebRequest -Uri "$releaseInfoUrl" -UseBasicParsing -Method GET
+
+      $releaseInfo = @{}
+      foreach ($line in $resp.Content.Split("`n")) {
+          $info = $line -split "="
+          $releaseInfo.add($info[0],$info[1])
+      }
+      $url = $releaseInfo.url
+    } else {
+      $url = "https://github.com/buildkite/agent/releases/download/v$($version)/buildkite-agent-windows-$arch-$($version).zip"
     }
-    Write-Host "Finding latest release"
-
-    $resp = Invoke-WebRequest -Uri "$releaseInfoUrl" -UseBasicParsing -Method GET
-
-    $releaseInfo = @{}
-    foreach ($line in $resp.Content.Split("`n")) {
-        $info = $line -split "="
-        $releaseInfo.add($info[0],$info[1])
-    }
-    $url = $releaseInfo.url
 }
 
 # Github requires TLS1.2

install.sh

@@ -18,8 +18,6 @@ echo -e "\033[33m
                                                 __/ |
                                                |___/\033[0m"
 
-echo -e "Finding latest release..."
-
 SYSTEM="$(uname -s | awk '{print tolower($0)}')"
 MACHINE="$(uname -m | awk '{print tolower($0)}')"
 
@@ -73,11 +71,6 @@ else
   esac
 fi
 
-RELEASE_INFO_URL="https://buildkite.com/agent/releases/latest?platform=${PLATFORM}&arch=${ARCH}&system=${SYSTEM}&machine=${MACHINE}"
-if [[ "${BETA:-}" == "true" ]]; then
-  RELEASE_INFO_URL="${RELEASE_INFO_URL}&prerelease=true"
-fi
-
 if command -v curl >/dev/null 2>&1 ; then
   HTTP_GET="curl -LsS"
 elif command -v wget >/dev/null 2>&1 ; then
@@ -88,11 +81,24 @@ else
   exit 1
 fi
 
-LATEST_RELEASE="$(eval "${HTTP_GET} '${RELEASE_INFO_URL}'")"
+if [[ "${BUILDKITE_AGENT_VERSION:-"latest"}" == "latest" ]]; then
+    echo -e "Finding latest release..."
+
+    RELEASE_INFO_URL="https://buildkite.com/agent/releases/latest?platform=${PLATFORM}&arch=${ARCH}&system=${SYSTEM}&machine=${MACHINE}"
+    if [[ "${BETA:-}" == "true" ]]; then
+      RELEASE_INFO_URL="${RELEASE_INFO_URL}&prerelease=true"
+    fi
+
+    LATEST_RELEASE="$(eval "${HTTP_GET} '${RELEASE_INFO_URL}'")"
 
-VERSION="$(          echo "${LATEST_RELEASE}" | awk -F= '/version=/  { print $2 }')"
-DOWNLOAD_FILENAME="$(echo "${LATEST_RELEASE}" | awk -F= '/filename=/ { print $2 }')"
-DOWNLOAD_URL="$(     echo "${LATEST_RELEASE}" | awk -F= '/url=/      { print $2 }')"
+    VERSION="$(          echo "${LATEST_RELEASE}" | awk -F= '/version=/  { print $2 }')"
+    DOWNLOAD_FILENAME="$(echo "${LATEST_RELEASE}" | awk -F= '/filename=/ { print $2 }')"
+    DOWNLOAD_URL="$(     echo "${LATEST_RELEASE}" | awk -F= '/url=/      { print $2 }')"
+else
+    VERSION=$BUILDKITE_AGENT_VERSION
+    DOWNLOAD_FILENAME="buildkite-agent-${PLATFORM}-${ARCH}-${VERSION}.tar.gz"
+    DOWNLOAD_URL="https://github.com/buildkite/agent/releases/download/v${VERSION}/${DOWNLOAD_FILENAME}"
+fi
 
 if [[ "${DISABLE_CHECKSUM_VERIFICATION:-}" != "true" ]]; then
   if command -v openssl >/dev/null 2>&1 ; then