The latest Nexus version, 3.25.1*, does not upgrade smoothly. New exe version is not pointed to, and SSL certs are not preserved. This script is a workaround for that, with Chocolatey running the upgrade piece.

Update-SonatypeNexus.ps1

Stop-Service nexus

#Backup SSL Configuration
if(-not (Test-Path C:\nexusbackup)){
  New-Item C:\nexusbackup -ItemType Directory
}

if(Test-Path C:\ProgramData\nexus\etc\ssl\keystore.jks){
  Copy-Item C:\ProgramData\nexus\etc\ssl\keystore.jks C:\nexusbackup
}

if(Test-Path C:\ProgramData\nexus\etc\jetty\jetty-https.xml){
  Copy-Item C:\ProgramData\nexus\etc\jetty\jetty-https.xml C:\nexusbackup
}

#Remove the current Nexus folder
Remove-Item C:\ProgramData\nexus -Recurse -Force -ErrorAction SilentlyContinue

#Upgrade the package
choco upgrade nexus-repository -y -f -s "'https://chocolatey.org/api/v2/'"

#Restore SSL Configuration
if(Test-Path C:\nexusbackup\keystore.jks){
  Copy-Item C:\nexusbackup\keystore.jks C:\ProgramData\nexus\etc\ssl
}

if(Test-Path C:\nexusbackup\jetty-https.xml){
  Copy-Item C:\nexusbackup\jetty-https.xml C:\ProgramData\nexus\etc\jetty
}

#Restart the nexus service to apply the configuration
Start-Service nexus

#Cleanup backup folder
Remove-Item C:\nexusbackup -Recurse -Force