CRAN release v0.4.9

Packrat 0.4.9

• Packrat now understands how to install R packages from private GitHub
  repositories. (The GITHUB_PAT environment variable should be set with
  an access token that provides access to the associated repositories.)
  (#449, #448, @ras44)

• Packrat gained the get_lockfile_metadata() and set_lockfile_metadata()
  functions, for changing metadata associated with a particular Packrat project;
  e.g. the active R version, or the active set of repositories. (#429, @cderv)

• Packrat now ignores all source files within a packrat/ directory when
  inferring dependencies, not just the packrat/ directory discovered at
  the top level. (#385)

• Packrat no longer includes the .Rhistory file when creating bundles. (#401)

• Packrat now properly handles the plain 'http' protocol when using versions
  R >= 3.2. (We now set options(download.file.method = "wininet") rather than
  options(download.file.method = "internal") in such cases.)

• The infer.dependencies argument can now be used to switch off the scanning of
  code for dependencies when using packrat::init() and packrat::snapshot().

• Packrat no longer fails to download the current version of a package if
  the binary and source branches of the active repositories are out of sync.

• Packrat now attempts to parse scripts using UTF-8 encoding in addition to the
  system encoding. This should primarily help users on Windows who (rightly)
  save their documents using UTF-8 encoding rather than the default system
  encoding.

• Packrat now screens out empty package names discovered during package
  dependency discovery. (#314)

• The Packrat global cache is now enabled on Windows. Junction points
  (rather than symbolic links) are used to populate entries in the
  private Packrat library.

• The 'lib-R' and 'lib-ext' directories now use architecture-specific
  sub-directories for their libraries. This should further help in cases
  where multiple versions of R are operating within a Packrat project
  at the same time.

• Packrat now better handles cases where non-symlink files find their
  way into the 'lib-R' and 'lib-ext' folders.

• Packrat now better handles packages that contain trailing
  newlines in their DESCRIPTION file -- it now avoids
  inserting intervening blank lines between records, which
  should resolve the 'Error: contains a blank line' error that
  can occur during package installation.

• Packrat now only checks for the 'BiocInstaller' package within the
  Packrat private library, when attempting to ascertain whether
  Bioconductor is used by a particular project.

• Packrat no longer automatically restores projects on startup when
  Packrat is not detected within the library directory.

• Packrat now more eagerly caches packages during packrat::restore() --
  packages will be immediately cached following successful installation,
  rather than at the end of the restore process. (#324)

• Packrat now better handles cases where multiple R processes attempt
  to write the same package to the cache at the same time. (#333)

• Packrat now properly checks whether a package exists in the cache
  before attempting to copy / symlink that package to the active library
  directory. (#335)

• Users can now control whether Packrat snapshots sources by setting the
  R_PACKRAT_SNAPSHOT_SOURCES environment variable to a 'truthy' value, or by
  setting the R option packrat.snapshot.sources.

• Packrat now provides APIs for accessing the active paths to resource
  directories, with:

  • packrat::project_dir(project)
  • packrat::src_dir(project)
  • packrat::lib_dir(project)
  • packrat::bundles_dir(project)

  See ?packrat-resources for more details.

• Packrat better preserves the pre-existing contents of ignore files. (#332)