install: default jj setup in one-click flow

install/install.ps1

@@ -1,6 +1,11 @@
 param(
   [string]$RepoUrl = "https://fun-md.com/Fun_MD/devops-skills.git",
-  [string]$CodexHome = "$HOME\.codex"
+  [string]$CodexHome = "$HOME\.codex",
+  [switch]$SkipJj,
+  [ValidateSet("auto", "winget", "scoop", "cargo")]
+  [string]$JjInstallMethod = $(if ($env:JJ_INSTALL_METHOD) { $env:JJ_INSTALL_METHOD } else { "auto" }),
+  [ValidateSet("release", "prerelease")]
+  [string]$JjChannel = $(if ($env:JJ_CHANNEL) { $env:JJ_CHANNEL } else { "release" })
 )
 
 $ErrorActionPreference = "Stop"
@@ -8,13 +13,136 @@ $ErrorActionPreference = "Stop"
 $skillName = "gitea-issue-devops-agent"
 $targetDir = Join-Path $CodexHome "skills\$skillName"
 $tmpRoot = Join-Path $env:TEMP ("devops-skills-" + [Guid]::NewGuid().ToString("N"))
+$installJj = $true
+if ($SkipJj.IsPresent) {
+  $installJj = $false
+}
+if ($env:INSTALL_JJ -and $env:INSTALL_JJ -eq "0") {
+  $installJj = $false
+}
+
+function Write-InstallLog {
+  param([string]$Message)
+  Write-Host "[install] $Message"
+}
+
+function Write-InstallWarn {
+  param([string]$Message)
+  Write-Warning "[install] $Message"
+}
+
+function Test-CommandAvailable {
+  param([string]$Name)
+  return $null -ne (Get-Command $Name -ErrorAction SilentlyContinue)
+}
+
+function Show-JjManualHelp {
+  Write-InstallWarn "jj was not installed automatically."
+  Write-InstallWarn "Manual options:"
+  Write-InstallWarn "  - winget install jj-vcs.jj"
+  Write-InstallWarn "  - scoop install main/jj"
+  if ($JjChannel -eq "prerelease") {
+    Write-InstallWarn "  - cargo install --git https://github.com/jj-vcs/jj.git --locked --bin jj jj-cli"
+  }
+  else {
+    Write-InstallWarn "  - cargo install --locked --bin jj jj-cli"
+  }
+  Write-InstallWarn "After installation, verify with: jj --version"
+}
+
+function Install-JjWithWinget {
+  if (-not (Test-CommandAvailable winget)) {
+    return $false
+  }
+  if ($JjChannel -ne "release") {
+    Write-InstallWarn "winget path skipped because prerelease jj is requested."
+    return $false
+  }
+
+  Write-InstallLog "attempting jj installation via winget"
+  & winget install --id jj-vcs.jj -e --accept-source-agreements --accept-package-agreements
+  return $LASTEXITCODE -eq 0
+}
+
+function Install-JjWithScoop {
+  if (-not (Test-CommandAvailable scoop)) {
+    return $false
+  }
+  if ($JjChannel -ne "release") {
+    Write-InstallWarn "scoop path skipped because prerelease jj is requested."
+    return $false
+  }
+
+  Write-InstallLog "attempting jj installation via scoop"
+  & scoop install main/jj
+  return $LASTEXITCODE -eq 0
+}
+
+function Install-JjWithCargo {
+  if (-not (Test-CommandAvailable cargo)) {
+    return $false
+  }
+
+  Write-InstallLog "attempting jj installation via cargo"
+  if ($JjChannel -eq "prerelease") {
+    & cargo install --git https://github.com/jj-vcs/jj.git --locked --bin jj jj-cli
+  }
+  else {
+    & cargo install --locked --bin jj jj-cli
+  }
+  return $LASTEXITCODE -eq 0
+}
+
+function Invoke-JjInstall {
+  if (-not $installJj) {
+    Write-InstallLog "skipping jj installation because INSTALL_JJ=0 or -SkipJj was provided"
+    return
+  }
+
+  if (Test-CommandAvailable jj) {
+    Write-InstallLog "jj already installed: $(& jj --version)"
+    return
+  }
+
+  $installed = $false
+  switch ($JjInstallMethod) {
+    "auto" {
+      $installed = (Install-JjWithWinget) -or (Install-JjWithScoop) -or (Install-JjWithCargo)
+      break
+    }
+    "winget" {
+      $installed = Install-JjWithWinget
+      break
+    }
+    "scoop" {
+      $installed = Install-JjWithScoop
+      break
+    }
+    "cargo" {
+      $installed = Install-JjWithCargo
+      break
+    }
+  }
+
+  if (-not $installed) {
+    Show-JjManualHelp
+    return
+  }
+
+  if (Test-CommandAvailable jj) {
+    Write-InstallLog "jj installation succeeded: $(& jj --version)"
+  }
+  else {
+    Show-JjManualHelp
+  }
+}
 
 try {
-  if (-not (Get-Command git -ErrorAction SilentlyContinue)) {
+  if (-not (Test-CommandAvailable git)) {
     throw "[install] git is required but not found."
   }
 
-  Write-Host "[install] downloading $skillName from $RepoUrl"
+  Write-InstallLog "downloading $skillName from $RepoUrl"
   git clone --depth 1 $RepoUrl $tmpRoot | Out-Null
 
   $sourceDir = Join-Path $tmpRoot "skills\$skillName"
@@ -28,8 +156,10 @@ try {
   }
   Copy-Item -Path $sourceDir -Destination $targetDir -Recurse -Force
 
-  Write-Host "[install] done"
-  Write-Host "[install] installed path: $targetDir"
+  Write-InstallLog "skill installed"
+  Write-InstallLog "installed path: $targetDir"
+  Invoke-JjInstall
+  Write-InstallLog "done"
 }
 finally {
   if (Test-Path $tmpRoot) {