feat: experimental uvr backend (shiny2docker_uvr)

NAMESPACE

@@ -3,10 +3,12 @@
 export(set_github_action)
 export(set_gitlab_ci)
 export(shiny2docker)
+export(shiny2docker_uvr)
 importFrom(attachment,create_renv_for_prod)
 importFrom(cli,cli_alert_danger)
 importFrom(cli,cli_alert_info)
 importFrom(cli,cli_alert_success)
+importFrom(dockerfiler,Dockerfile)
 importFrom(dockerfiler,dock_from_renv)
 importFrom(here,here)
 importFrom(yesno,yesno2)

R/shiny2docker_uvr.R

@@ -0,0 +1,67 @@
+#' shiny2docker_uvr
+#'
+#' Generate a Dockerfile for a Shiny application using
+#' [uvr](https://github.com/nbafrank/uvr) instead of `renv`. The R version is
+#' installed inside the container by `uvr` (no `rocker/r-ver` base image
+#' required) and packages are restored from `uvr.lock` via `uvr sync --frozen`.
+#'
+#' Lifecycle: experimental. Requires the project to already be uvr-managed
+#' (`uvr.toml`, `uvr.lock`, and `.r-version` present at the project root).
+#'
+#' @param path Character. Path to the folder containing the Shiny application.
+#' @param output Character. Path to the generated Dockerfile.
+#' @param uvr_toml Path to the `uvr.toml` manifest. Defaults to `<path>/uvr.toml`.
+#' @param uvr_lock Path to the `uvr.lock` lockfile. Defaults to `<path>/uvr.lock`.
+#' @param r_version_file Path to the R version pin. Defaults to `<path>/.r-version`.
+#' @param base_image Character. Docker base image. Defaults to `"debian:stable-slim"`.
+#' @param uvr_version Character. `"latest"` or a semver tag like `"v0.3.1"`.
+#'   Pinning a tag is recommended for reproducible builds.
+#' @param port Integer. Shiny port to expose. Default `3838`.
+#' @param host Character. Shiny host. Default `"0.0.0.0"`.
+#' @param extra_sysreqs Character vector of extra debian packages to install
+#'   before `uvr sync` (escape hatch for system dependencies that uvr does not
+#'   detect on its own).
+#' @param write Logical. Whether to write the Dockerfile to `output`. Default `TRUE`.
+#'
+#' @return Invisibly, an R6 `dockerfiler::Dockerfile` object that can be further
+#'   customised before writing.
+#'
+#' @export
+#'
+#' @importFrom dockerfiler Dockerfile
+shiny2docker_uvr <- function(path           = ".",
+                             output         = file.path(path, "Dockerfile"),
+                             uvr_toml       = file.path(path, "uvr.toml"),
+                             uvr_lock       = file.path(path, "uvr.lock"),
+                             r_version_file = file.path(path, ".r-version"),
+                             base_image     = "debian:stable-slim",
+                             uvr_version    = "latest",
+                             port           = 3838,
+                             host           = "0.0.0.0",
+                             extra_sysreqs  = NULL,
+                             write          = TRUE) {
+
+  uvr_assert_state(
+    uvr_toml       = uvr_toml,
+    uvr_lock       = uvr_lock,
+    r_version_file = r_version_file
+  )
+
+  if (!file.exists(file.path(dirname(output), ".dockerignore"))) {
+    create_dockerignore_uvr(path = file.path(dirname(output), ".dockerignore"))
+  }
+
+  dock <- uvr_build_dockerfile(
+    base_image    = base_image,
+    uvr_version   = uvr_version,
+    port          = port,
+    host          = host,
+    extra_sysreqs = extra_sysreqs
+  )
+
+  if (isTRUE(write)) {
+    dock$write(output)
+  }
+
+  invisible(dock)
+}

R/utils_uvr.R

@@ -0,0 +1,198 @@
+#' Write a uvr-aware .dockerignore
+#'
+#' Adds the entries that are specific to a uvr-managed project (`.uvr/`,
+#' `.Rprofile` written by `uvr init`) on top of the defaults used by the
+#' `renv` backend.
+#'
+#' @param path Path to the `.dockerignore` to write.
+#' @noRd
+create_dockerignore_uvr <- function(path = ".dockerignore") {
+  entries <- c(
+    ".Rhistory",
+    ".git",
+    ".gitignore",
+    ".Rproj.user",
+    "manifest.json",
+    "rsconnect/",
+    ".uvr/",
+    "renv/",
+    "renv.lock"
+  )
+  writeLines(entries, con = path)
+}
+
+#' Assert that the project is uvr-ready
+#'
+#' Checks that `uvr.toml`, `uvr.lock` and a R version pin file all exist, and
+#' that `uvr.lock` is at least as recent as `uvr.toml`. Stops with an actionable
+#' message otherwise.
+#'
+#' @param uvr_toml Path to `uvr.toml`.
+#' @param uvr_lock Path to `uvr.lock`.
+#' @param r_version_file Path to `.r-version`.
+#'
+#' @return Invisibly `TRUE` on success.
+#' @noRd
+uvr_assert_state <- function(uvr_toml, uvr_lock, r_version_file) {
+
+  if (!file.exists(uvr_toml)) {
+    stop(
+      "uvr.toml not found at '", uvr_toml, "'.\n",
+      "Run `uvr init` (or `uvr import` from an existing renv.lock), then `uvr lock`.",
+      call. = FALSE
+    )
+  }
+  if (!file.exists(uvr_lock)) {
+    stop(
+      "uvr.lock not found at '", uvr_lock, "'.\n",
+      "Run `uvr lock` to generate it.",
+      call. = FALSE
+    )
+  }
+  if (file.info(uvr_lock)$mtime < file.info(uvr_toml)$mtime) {
+    stop(
+      "uvr.lock is older than uvr.toml — manifest changed since last lock.\n",
+      "Run `uvr lock` to refresh it.",
+      call. = FALSE
+    )
+  }
+  if (!file.exists(r_version_file)) {
+    stop(
+      ".r-version not found at '", r_version_file, "'.\n",
+      "Run `uvr r pin <version>` to pin the R version for the project.",
+      call. = FALSE
+    )
+  }
+
+  invisible(TRUE)
+}
+
+#' Build the uvr release download URL
+#'
+#' @param uvr_version Either `"latest"` or a tag like `"v0.3.1"` / `"0.3.1"`.
+#' @return A list with `url` and `arg_value`. `arg_value` is `NA` when
+#'   `uvr_version = "latest"` (no `ARG UVR_VERSION` injected).
+#' @noRd
+uvr_release_url <- function(uvr_version = "latest") {
+  asset <- "uvr-x86_64-unknown-linux-gnu.tar.gz"
+  base  <- "https://github.com/nbafrank/uvr/releases"
+
+  if (identical(uvr_version, "latest")) {
+    return(list(
+      url       = sprintf("%s/latest/download/%s", base, asset),
+      arg_value = NA_character_
+    ))
+  }
+
+  tag <- if (startsWith(uvr_version, "v")) uvr_version else paste0("v", uvr_version)
+  if (!grepl("^v[0-9]+\\.[0-9]+\\.[0-9]+", tag)) {
+    stop(
+      "uvr_version must be 'latest' or a semver tag like 'v0.3.1' / '0.3.1'. ",
+      "Got: '", uvr_version, "'",
+      call. = FALSE
+    )
+  }
+  list(
+    url       = sprintf("%s/download/%s/%s", base, tag, asset),
+    arg_value = tag
+  )
+}
+
+#' Build the Dockerfile object for the uvr backend
+#'
+#' @param base_image Base OS image (e.g. `"debian:stable-slim"`).
+#' @param uvr_version `"latest"` or a tag (`"v0.3.1"`).
+#' @param port Shiny port.
+#' @param host Shiny host.
+#' @param extra_sysreqs Optional character vector of extra debian packages to
+#'   `apt-get install` before `uvr sync`.
+#'
+#' @return An R6 `dockerfiler::Dockerfile` object.
+#' @noRd
+uvr_build_dockerfile <- function(base_image    = "debian:stable-slim",
+                                 uvr_version   = "latest",
+                                 port          = 3838,
+                                 host          = "0.0.0.0",
+                                 extra_sysreqs = NULL) {
+
+  release <- uvr_release_url(uvr_version)
+
+  dock <- dockerfiler::Dockerfile$new(FROM = base_image)
+
+  dock$ENV("DEBIAN_FRONTEND", "noninteractive")
+  dock$ENV("LANG",   "en_US.UTF-8")
+  dock$ENV("LC_ALL", "en_US.UTF-8")
+
+  dock$RUN(paste(
+    "apt-get update && apt-get install -y --no-install-recommends",
+    # base tooling
+    "ca-certificates curl locales tzdata",
+    # binutils provides `ar`, used by `uvr r install` to extract the Posit .deb
+    "binutils",
+    # runtime + build deps required by Posit's R .deb
+    "g++ gcc gfortran make zip unzip ucf",
+    "libbz2-dev libc6 libcairo2 libcurl4-openssl-dev libdeflate-dev",
+    "libglib2.0-0 libgomp1 libicu-dev liblzma-dev libopenblas-dev",
+    "libpango-1.0-0 libpangocairo-1.0-0 libpaper-utils libpcre2-dev",
+    "libpng16-16 libreadline8 libtcl8.6 libtiff6 libtirpc-dev libtk8.6",
+    "libx11-6 libxt6 zlib1g-dev",
+    # extra deps commonly needed when uvr falls back to source compilation
+    # (P3M binaries are not always available on debian targets as of uvr 0.2.15)
+    "libuv1-dev libxml2-dev libssl-dev libsodium-dev",
+    "&& sed -i '/en_US.UTF-8/s/^# //' /etc/locale.gen && locale-gen",
+    "&& rm -rf /var/lib/apt/lists/*"
+  ))
+
+  if (!is.na(release$arg_value)) {
+    dock$ARG(paste0("UVR_VERSION=", release$arg_value))
+  }
+
+  dock$RUN(paste0(
+    "curl -fsSL ", release$url,
+    " | tar xz -C /usr/local/bin uvr && uvr --version"
+  ))
+
+  dock$WORKDIR("/srv/shiny-server")
+  dock$COPY(from = ".r-version", to = "./")
+  dock$COPY(from = "uvr.toml",   to = "./")
+  dock$COPY(from = "uvr.lock",   to = "./")
+
+  # Workaround for nbafrank/uvr <= 0.2.15: `uvr r install` writes
+  # `etc/Renviron.site` directly under <r-versions>/<ver>/ but fails because
+  # that `etc/` dir doesn't exist (Posit's .deb places etc under lib/R/).
+  # Pre-creating the dir lets the install complete. Track upstream and drop
+  # this once fixed.
+  dock$RUN(paste(
+    "mkdir -p \"/root/.uvr/r-versions/$(cat .r-version)/etc\"",
+    "&& uvr r install \"$(cat .r-version)\""
+  ))
+
+  if (length(extra_sysreqs) > 0) {
+    dock$RUN(paste(
+      "apt-get update && apt-get install -y --no-install-recommends",
+      paste(extra_sysreqs, collapse = " "),
+      "&& rm -rf /var/lib/apt/lists/*"
+    ))
+  }
+
+  # Note: ideally `uvr sync --frozen` for CI strictness, but as of uvr 0.2.15
+  # the frozen check rejects locks generated on a different host than the
+  # container's target OS (e.g. host-side P3M URL vs CRAN source URL). Track
+  # upstream and switch back to --frozen once that's resolved.
+  dock$RUN("apt-get update && uvr sync && rm -rf /var/lib/apt/lists/*")
+
+  dock$COPY(from = ".", to = "/srv/shiny-server/")
+
+  # `uvr run` takes a script, not arbitrary R args, so embed the launch as a
+  # tiny R file written into the image at build time.
+  dock$RUN(sprintf(
+    "printf '%%s\\n' \"shiny::runApp(appDir = '/srv/shiny-server', host = '%s', port = %s)\" > /srv/shiny-server/_uvr_start.R",
+    host, port
+  ))
+
+  dock$EXPOSE(port)
+
+  dock$CMD("uvr run /srv/shiny-server/_uvr_start.R")
+
+  dock
+}

tests/testthat/fixtures/uvr-app/.gitignore

@@ -0,0 +1 @@
+/.uvr/library/

tests/testthat/fixtures/uvr-app/.r-version

@@ -0,0 +1 @@
+4.4.2

tests/testthat/fixtures/uvr-app/app.R

@@ -0,0 +1,9 @@
+library(shiny)
+ui <- fluidPage(
+  titlePanel("uvr POC"),
+  textOutput("msg")
+)
+server <- function(input, output, session) {
+  output$msg <- renderText("Hello from a uvr-built shiny container.")
+}
+shinyApp(ui, server)