X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=tags%2Fgsoc_final%2FR%2Fgetrpkg.R;fp=tags%2Fgsoc_final%2FR%2Fgetrpkg.R;h=3c7e0af2cfb5b02f023a50bf5262ebc5bf43ab9e;hb=5101cce1568b46d042316f32c8216e956f76ff65;hp=0000000000000000000000000000000000000000;hpb=1d3c6e2092b87a8e640704ce3ceec4e8ece3859e;p=cran2deb.git

diff --git a/tags/gsoc_final/R/getrpkg.R b/tags/gsoc_final/R/getrpkg.R
new file mode 100644
index 0000000..3c7e0af
--- /dev/null
+++ b/tags/gsoc_final/R/getrpkg.R
@@ -0,0 +1,157 @@
+setup <- function() {
+    # set up the working directory
+    tmp <- tempfile('cran2deb')
+    dir.create(tmp)
+    return (tmp)
+}
+
+cleanup <- function(dir) {
+    # remove the working directory
+    unlink(dir,recursive=T)
+    invisible()
+}
+
+download_pkg <- function(dir, pkgname) {
+    # download pkgname into dir, and construct some metadata
+
+    # record some basic information
+    pkg <- pairlist()
+    pkg$date_stamp = format(Sys.time(),'%a, %d %b %Y %H:%M:%S %z')
+    pkg$name = pkgname
+    pkg$repoURL = available[pkgname,'Repository']
+    pkg$repo = repourl_as_debian(pkg$repoURL)
+    if (!length(grep('^[A-Za-z0-9][A-Za-z0-9+.-]+$',pkg$name))) {
+        fail('Cannot convert package name into a Debian name',pkg$name)
+    }
+    pkg$srcname = pkgname_as_debian(pkg$name,binary=F)
+    pkg$debname = pkgname_as_debian(pkg$name,repo=pkg$repo)
+    pkg$version <- available[pkgname,'Version']
+
+    # see if we have already built this release and uploaded it.
+    debfn <- file.path(pbuilder_results, paste(pkg$srcname, '_', pkg$version, '.orig.tar.gz', sep=''))
+    pkg$need_repack = FALSE
+    if (file.exists(debfn)) {
+        # if so, use the existing archive. this is good for three reasons:
+        # 1. it saves downloading the archive again
+        # 2. the repacking performed below changes the MD5 sum of the archive
+        #    which upsets some Debian archive software.
+        # 3. why repack more than once?
+        pkg$archive <- file.path(dir, basename(debfn))
+        file.copy(debfn,pkg$archive)
+        pkg$path = file.path(dir, paste(pkg$srcname ,pkg$version ,sep='-'))
+    } else {
+        # use this instead of download.packages as it is more resilient to
+        # dodgy network connections (hello BT 'OpenWorld', bad ISP)
+        fn <- paste(pkgname, '_', pkg$version, '.tar.gz', sep='')
+        url <- paste(available[pkgname,'Repository'], fn, sep='/')
+        archive <- file.path(dir, fn)
+        # don't log the output -- we don't care!
+        ret <- system(paste('curl','-o',shQuote(archive),'-m 720 --retry 5',shQuote(url)))
+        if (ret != 0) {
+            fail('failed to download',url)
+        }
+        # end of download.packages replacement
+
+        if (length(grep('\\.\\.',archive)) || normalizePath(archive) != archive) {
+            fail('funny looking path',archive)
+        }
+        pkg$path = sub("_\\.(zip|tar\\.gz)", ""
+                      ,gsub(.standard_regexps()$valid_package_version, ""
+                      ,archive))
+        pkg$archive = archive
+        # this is not a Debian conformant archive
+        pkg$need_repack = TRUE
+    }
+    return(pkg)
+}
+
+repack_pkg <- function(pkg) {
+    # re-pack into a Debian-named archive with a Debian-named directory.
+    debpath = file.path(dirname(pkg$archive)
+                   ,paste(pkg$srcname
+                         ,pkg$version
+                         ,sep='-'))
+    file.rename(pkg$path, debpath)
+    pkg$path = debpath
+    debarchive = file.path(dirname(pkg$archive)
+                          ,paste(pkg$srcname,'_'
+                                ,pkg$version,'.orig.tar.gz'
+                                ,sep=''))
+    wd <- getwd()
+    setwd(dirname(pkg$path))
+    # remove them pesky +x files
+    # BUT EXCLUDE configure and cleanup
+    log_system('find',shQuote(basename(pkg$path))
+                ,'-type f -a '
+                ,   '! \\( -name configure -o -name cleanup \\)'
+                ,'-exec chmod -x {} \\;')
+    # tar it all back up
+    log_system('tar -czf',shQuote(debarchive),shQuote(basename(pkg$path)))
+    setwd(wd)
+    file.remove(pkg$archive)
+    pkg$archive = debarchive
+    pkg$need_repack = FALSE
+    return(pkg)
+}
+
+prepare_pkg <- function(dir, pkgname) {
+    # download and extract an R package named pkgname
+    # OR the bundle containing pkgname
+
+    # based loosely on library/utils/R/packages2.R::install.packages
+
+    # first a little trick; change pkgname if pkgname is contained in a bundle
+    if (!(pkgname %in% rownames(available))) {
+        bundle <- r_bundle_of(pkgname)
+        if (is.null(bundle)) {
+            fail('package',pkgname,'is unavailable')
+        }
+        pkgname <- bundle
+    }
+
+    # grab the archive and some metadata
+    pkg <- download_pkg(dir, pkgname)
+
+    # now extract the archive
+    if (!length(grep('\\.tar\\.gz',pkg$archive))) {
+        fail('archive is not tarball')
+    }
+    wd <- getwd()
+    setwd(dir)
+    ret = log_system('tar','xzf',shQuote(pkg$archive))
+    setwd(wd)
+    if (ret != 0) {
+        fail('Extraction of archive',pkg$archive,'failed.')
+    }
+
+    # if necessary, repack the archive into Debian-conformant format
+    if (pkg$need_repack) {
+        pkg <- repack_pkg(pkg)
+    }
+    if (!file.info(pkg$path)[,'isdir']) {
+        fail(pkg$path,'is not a directory and should be.')
+    }
+
+    # extract the DESCRIPTION file, which contains much metadata
+    pkg$description = read.dcf(file.path(pkg$path,'DESCRIPTION'))
+
+    # ensure consistency of version numbers
+    if ('Version' %in% names(pkg$description[1,])) {
+        if (pkg$description[1,'Version'] != available[pkg$name,'Version']) {
+            # should never happen since available is the basis upon which the
+            # package is retrieved.
+            error('available version:',available[pkg$name,'Version'])
+            error('package version:',pkg$description[1,'Version'])
+            fail('inconsistency between R package version and cached R version')
+        }
+    }
+
+    pkg$is_bundle = 'Bundle' %in% names(pkg$description[1,])
+    # note subtly of short circuit operators (no absorption)
+    if ((!pkg$is_bundle && pkg$description[1,'Package'] != pkg$name) ||
+        ( pkg$is_bundle && pkg$description[1,'Bundle'] != pkg$name)) {
+        fail('package name mismatch')
+    }
+    return(pkg)
+}
+