Add support for local package downloads (file://)

@@ -89,14 +89,15 @@
 # working copy of the source repository for their corresponding SCM,
 # checking out the requested version / commit / tag, and create an
 # archive out of it. DOWNLOAD_WGET is the normal wget-based download
-# mechanism.
+# mechanism. DOWNLOAD_FILE is for packages residing on standard
+# filesystem paths (local, nfs, ...).
 #
-# The SOURCE_CHECK_{GIT,SVN,BZR,WGET} helpers are in charge of simply
+# The SOURCE_CHECK_{GIT,SVN,BZR,WGET,FILE} helpers are in charge of simply
 # checking that the source is available for download. This can be used
 # to make sure one will be able to get all the sources needed for
 # one's build configuration.
 #
-# The SHOW_EXTERNAL_DEPS_{GIT,SVN,BZR,WGET} helpers simply output to
+# The SHOW_EXTERNAL_DEPS_{GIT,SVN,BZR,WGET,FILE} helpers simply output to
 # the console the names of the files that will be downloaded, or path
 # and revision of the source repositories, producing a list of all the
 # "external dependencies" of a given build configuration.

@@ -170,6 +171,20 @@
   echo $(2)
 endef
 
+
+define DOWNLOAD_FILE
+	test -e $(DL_DIR)/$(2) || \
+	cp `echo "$(call qstrip,$(1))/$(2)" | sed 's_^.*://__'` $(DL_DIR)
+endef
+
+define SOURCE_CHECK_FILE
+  test -e `echo "$(call qstrip,$(1))/$(2)" | sed 's_^.*://__'`
+endef
+
+define SHOW_EXTERNAL_DEPS_FILE
+  echo $(2)
+endef
+
 ################################################################################
 # DOWNLOAD -- Download helper. Will try to download source from:
 # 1) BR2_PRIMARY_SITE if enabled

@@ -192,6 +207,7 @@
 			git) $($(DL_MODE)_GIT) && exit ;; \
 			svn) $($(DL_MODE)_SVN) && exit ;; \
 			bzr) $($(DL_MODE)_BZR) && exit ;; \
+			file) $($(DL_MODE)_FILE) && exit ;; \
 			*) $(call $(DL_MODE)_WGET,$(1),$(2)) && exit ;; \
 		esac ; \
 	fi ; \

@@ -198,9 +198,14 @@
 # $(call DOWNLOAD,$(FOO_SITE),$(FOO_SOURCE))
 ################################################################################
 
+geturischeme=$(firstword $(subst ://, ,$(call qstrip,$(1))))
+
 define DOWNLOAD
 	$(Q)if test -n "$(call qstrip,$(BR2_PRIMARY_SITE))" ; then \
-		$(call $(DL_MODE)_WGET,$(BR2_PRIMARY_SITE),$(2)) && exit ; \
+		case "$(call geturischeme,$(BR2_PRIMARY_SITE))" in \
+			file) $(call $(DL_MODE)_FILE,$(BR2_PRIMARY_SITE),$(2)) && exit ;; \
+			*) $(call $(DL_MODE)_WGET,$(BR2_PRIMARY_SITE),$(2)) && exit ;; \
+		esac ; \
 	fi ; \
 	if test -n "$(1)" ; then \
 		case "$($(PKG)_SITE_METHOD)" in \

@@ -212,7 +217,10 @@
 		esac ; \
 	fi ; \
 	if test -n "$(call qstrip,$(BR2_BACKUP_SITE))" ; then \
-		$(call $(DL_MODE)_WGET,$(BR2_BACKUP_SITE),$(2)) && exit ; \
+		case "$(call geturischeme,$(BR2_BACKUP_SITE))" in \
+			file) $(call $(DL_MODE)_FILE,$(BR2_BACKUP_SITE),$(2)) && exit ;; \
+			*) $(call $(DL_MODE)_WGET,$(BR2_BACKUP_SITE),$(2)) && exit ;; \
+		esac ; \
 	fi ; \
 	exit 1
 endef

@@ -419,7 +427,7 @@
   $(2)_SITE_METHOD = $($(3)_SITE_METHOD)
  else
 	# Try automatic detection using the scheme part of the URI
-	$(2)_SITE_METHOD = $(firstword $(subst ://, ,$(call qstrip,$($(2)_SITE))))
+	$(2)_SITE_METHOD = $(call geturischeme,$($(2)_SITE))
  endif
 endif
 

@@ -1045,8 +1045,8 @@
       in the package directory inside Buildroot will be applied to the
       package after extraction.</li>
 
-      <li><code>LIBFOO_SITE</code> may contain the Internet location
-      of the package. It can either be the HTTP or FTP location of a
+      <li><code>LIBFOO_SITE</code> may contain the location
+      of the package. It can either be the HTTP, FTP or filesystem location of a
       tarball, or the URL of a Git or Subversion repository
       (see <code>LIBFOO_SITE_METHOD</code>
       below). If <code>HOST_LIBFOO_SITE</code> is not specified, it

@@ -1055,17 +1055,20 @@
       <code>http://$$(BR2_SOURCEFORGE_MIRROR).dl.sourceforge.net/sourceforge/packagename</code>.
       <br/>Examples:<br/>
       <code>LIBFOO_SITE=http://www.libfoosoftware.org/libfoo</code><br/>
-      <code>LIBFOO_SITE=http://svn.xiph.org/trunk/Tremor/</code></li>
+      <code>LIBFOO_SITE=http://svn.xiph.org/trunk/Tremor/</code><br/>
+      <code>LIBFOO_SITE=file://project/store/</code></li>
 
       <li><code>LIBFOO_SITE_METHOD</code> may contain the method to
       fetch the package source code. It can either
       be <code>wget</code> (for normal FTP/HTTP downloads of
-      tarballs), <code>svn</code>, <code>git</code> or <code>bzr</code>.
+      tarballs), <code>file</code> (for local filesystem copy),
+      <code>svn</code>, <code>git</code> or <code>bzr</code>.
       When not specified, it is guessed from the URL given
-      in <code>LIBFOO_SITE</code>: <code>svn://</code>, <code>git://</code>
-      and <code>bzr://</code> URLs will use the <code>svn</code>,
-      <code>git</code> and <code>bzr</code> methods respectively. All other
-      URL-types will use the <code>wget</code> method. So for example, in the
+      in <code>LIBFOO_SITE</code>: <code>svn://</code>, <code>git://</code>,
+      <code>bzr://</code> and <code>file://</code> URLs will use the
+      <code>svn</code>, <code>git</code>, <code>bzr</code> and
+      <code>file</code> methods respectively. All other URL-types will
+      use the <code>wget</code> method. So for example, in the
       case of a package whose source code is available through
       Subversion repository on HTTP, one <i>must</i>
       specifiy <code>LIBFOO_SITE_METHOD=svn</code>. For <code>svn</code>

@@ -1073,10 +1076,12 @@
       checkout/clone of the repository which is then tarballed and
       stored into the download cache. Next builds will not
       checkout/clone again, but will use the tarball
-      directly. When <code>HOST_LIBFOO_SITE_METHOD</code> is not
-      specified, it defaults to the value
-      of <code>LIBFOO_SITE_METHOD</code>. See <code>package/multimedia/tremor/</code>
-      for an example.</li>
+      directly. Note that the <code>file</code> method is only useful in
+      projects where all developers have access to the same filesystem
+      (which can be an NFS share, of course). When
+      <code>HOST_LIBFOO_SITE_METHOD</code> is not specified, it defaults
+      to the value of <code>LIBFOO_SITE_METHOD</code>.
+      See <code>package/multimedia/tremor/</code> for an example.</li>
 
       <li><code>LIBFOO_DEPENDENCIES</code> lists the dependencies (in terms
       of package name) that are required for the current target package to