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#' Lockfiles
#'
#' A **lockfile** records the state of a project at some point in time.
#'
#' A lockfile captures the state of a project's library at some point in time.
#' In particular, the package names, their versions, and their sources (when
#' known) are recorded in the lockfile.
#'
#' Projects can be restored from a lockfile using the [restore()] function. This
#' implies reinstalling packages into the project's private library, as encoded
#' within the lockfile.
#'
#' While lockfiles are normally generated and used with [snapshot()] /
#' [restore()], they can also be edited by hand if so desired. Lockfiles are
#' written as `.json`, to allow for easy consumption by other tools.
#'
#' An example lockfile follows:
#'
#' ```
#' {
#' "R": {
#' "Version": "3.6.1",
#' "Repositories": [
#' {
#' "Name": "CRAN",
#' "URL": "https://cloud.r-project.org"
#' }
#' ]
#' },
#' "Packages": {
#' "markdown": {
#' "Package": "markdown",
#' "Version": "1.0",
#' "Source": "Repository",
#' "Repository": "CRAN",
#' "Hash": "4584a57f565dd7987d59dda3a02cfb41"
#' },
#' "mime": {
#' "Package": "mime",
#' "Version": "0.7",
#' "Source": "Repository",
#' "Repository": "CRAN",
#' "Hash": "908d95ccbfd1dd274073ef07a7c93934"
#' }
#' }
#' }
#' ```
#'
#' The sections used within a lockfile are described next.
#'
#' ## renv
#'
#' Information about the version of renv used to manage this project.
#'
#' \tabular{ll}{
#' \strong{Version} \tab The version of the renv package used with this project. \cr
#' }
#'
#' ## R
#'
#' Properties related to the version of \R associated with this project.
#'
#' \tabular{ll}{
#' \strong{Version} \tab The version of \R used. \cr
#' \strong{Repositories} \tab The \R repositories used in this project. \cr
#' }
#'
#' ## Packages
#'
#' \R package records, capturing the packages used or required by a project
#' at the time when the lockfile was generated.
#'
#' \tabular{ll}{
#' \strong{Package} \tab The package name. \cr
#' \strong{Version} \tab The package version. \cr
#' \strong{Source} \tab The location from which this package was retrieved. \cr
#' \strong{Repository} \tab The name of the repository (if any) from which this package was retrieved. \cr
#' \strong{Hash} \tab (Optional) A unique hash for this package, used for package caching. \cr
#' }
#'
#' Additional remote fields, further describing how the package can be
#' retrieved from its corresponding source, will also be included as
#' appropriate (e.g. for packages installed from GitHub).
#'
#' ## Python
#'
#' Metadata related to the version of Python used with this project (if any).
#'
#' \tabular{ll}{
#' \strong{Version} \tab The version of Python being used. \cr
#' \strong{Type} \tab The type of Python environment being used ("virtualenv", "conda", "system") \cr
#' \strong{Name} \tab The (optional) name of the environment being used.
#' }
#'
#' Note that the `Name` field may be empty. In that case, a project-local Python
#' environment will be used instead (when not directly using a system copy of Python).
#'
#' # Caveats
#'
#' These functions are primarily intended for expert users -- in most cases,
#' [snapshot()] and [restore()] are the primariy tools you will need when
#' creating and using lockfiles.
#'
#' @inheritParams snapshot
#' @inheritParams renv-params
#'
#' @param lockfile An `renv` lockfile; typically created by either
#' `lockfile_create()` or `lockfile_read()`.
#'
#' @param file A file path, or \R connection.
#'
#' @family reproducibility
#' @name lockfiles
#' @rdname lockfiles
NULL
#' @param libpaths The library paths to be used when generating the lockfile.
#' @rdname lockfiles
#' @export
lockfile_create <- function(type = settings$snapshot.type(project = project),
libpaths = .libPaths(),
packages = NULL,
exclude = NULL,
prompt = interactive(),
force = FALSE,
...,
project = NULL)
{
renv_dots_check(...)
project <- renv_project_resolve(project)
renv_scope_verbose_if(prompt)
renv_lockfile_create(
project = project,
type = type,
libpaths = libpaths,
packages = packages,
exclude = exclude,
prompt = prompt,
force = force
)
}
#' @rdname lockfiles
#' @export
lockfile_read <- function(file = NULL, ..., project = NULL) {
project <- renv_project_resolve(project)
file <- file %||% renv_paths_lockfile(project = project)
renv_lockfile_read(file = file)
}
#' @rdname lockfiles
#' @export
lockfile_write <- function(lockfile, file = NULL, ..., project = NULL) {
project <- renv_project_resolve(project)
file <- file %||% renv_paths_lockfile(project = project)
renv_lockfile_write(lockfile, file = file)
}
#' @param remotes An \R vector of remote specifications.
#'
#' @param repos A named vector, mapping \R repository names to their URLs.
#'
#' @rdname lockfiles
#' @export
lockfile_modify <- function(lockfile = NULL,
...,
remotes = NULL,
repos = NULL,
project = NULL)
{
renv_dots_check(...)
project <- renv_project_resolve(project)
lockfile <- lockfile %||% renv_lockfile_load(project, strict = TRUE)
if (!is.null(repos))
lockfile$R$Repositories <- as.list(repos)
if (!is.null(remotes)) {
remotes <- renv_records_resolve(remotes, latest = TRUE)
names(remotes) <- map_chr(remotes, `[[`, "Package")
enumerate(remotes, function(package, remote) {
record <- renv_remotes_resolve(remote)
renv_lockfile_records(lockfile)[[package]] <<- record
})
}
lockfile
}
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