--- /dev/null
+################################################################################
+#
+# This file contains the download helpers for the various package
+# infrastructures. It is used to handle downloads from HTTP servers,
+# FTP servers, Git repositories, Subversion repositories, Mercurial
+# repositories, Bazaar repositories, and SCP servers.
+#
+################################################################################
+
+# Download method commands
+export WGET := $(call qstrip,$(BR2_WGET))
+export SVN := $(call qstrip,$(BR2_SVN))
+export CVS := $(call qstrip,$(BR2_CVS))
+export BZR := $(call qstrip,$(BR2_BZR))
+export GIT := $(call qstrip,$(BR2_GIT))
+export HG := $(call qstrip,$(BR2_HG))
+export SCP := $(call qstrip,$(BR2_SCP))
+SSH := $(call qstrip,$(BR2_SSH))
+export LOCALFILES := $(call qstrip,$(BR2_LOCALFILES))
+
+DL_WRAPPER = support/download/dl-wrapper
+
+# DL_DIR may have been set already from the environment
+ifeq ($(origin DL_DIR),undefined)
+DL_DIR ?= $(call qstrip,$(BR2_DL_DIR))
+ifeq ($(DL_DIR),)
+DL_DIR := $(TOPDIR)/dl
+endif
+else
+# Restore the BR2_DL_DIR that was overridden by the .config file
+BR2_DL_DIR = $(DL_DIR)
+endif
+
+# ensure it exists and a absolute path
+DL_DIR := $(shell mkdir -p $(DL_DIR) && cd $(DL_DIR) >/dev/null && pwd)
+
+#
+# URI scheme helper functions
+# Example URIs:
+# * http://www.example.com/dir/file
+# * scp://www.example.com:dir/file (with domainseparator :)
+#
+# geturischeme: http
+geturischeme = $(firstword $(subst ://, ,$(call qstrip,$(1))))
+# stripurischeme: www.example.com/dir/file
+stripurischeme = $(lastword $(subst ://, ,$(call qstrip,$(1))))
+# domain: www.example.com
+domain = $(firstword $(subst $(call domainseparator,$(2)), ,$(call stripurischeme,$(1))))
+# notdomain: dir/file
+notdomain = $(patsubst $(call domain,$(1),$(2))$(call domainseparator,$(2))%,%,$(call stripurischeme,$(1)))
+#
+# default domainseparator is /, specify alternative value as first argument
+domainseparator = $(if $(1),$(1),/)
+
+# github(user,package,version): returns site of GitHub repository
+github = https://github.com/$(1)/$(2)/archive/$(3)
+
+# Expressly do not check hashes for those files
+# Exported variables default to immediately expanded in some versions of
+# make, but we need it to be recursively-epxanded, so explicitly assign it.
+export BR_NO_CHECK_HASH_FOR =
+
+################################################################################
+# The DOWNLOAD_* helpers are in charge of getting a 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_SCP uses scp to obtain a remote file with
+# ssh authentication. DOWNLOAD_WGET is the normal wget-based download
+# mechanism.
+#
+# The SOURCE_CHECK_* 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.
+################################################################################
+
+define DOWNLOAD_GIT
+ $(EXTRA_ENV) $(DL_WRAPPER) -b git \
+ -o $(DL_DIR)/$($(PKG)_SOURCE) \
+ $(QUIET) \
+ -- \
+ $($(PKG)_SITE) \
+ $($(PKG)_DL_VERSION) \
+ $($(PKG)_BASE_NAME)
+endef
+
+# TODO: improve to check that the given PKG_DL_VERSION exists on the remote
+# repository
+define SOURCE_CHECK_GIT
+ $(GIT) ls-remote --heads $($(PKG)_SITE) > /dev/null
+endef
+
+define DOWNLOAD_BZR
+ $(EXTRA_ENV) $(DL_WRAPPER) -b bzr \
+ -o $(DL_DIR)/$($(PKG)_SOURCE) \
+ $(QUIET) \
+ -- \
+ $($(PKG)_SITE) \
+ $($(PKG)_DL_VERSION) \
+ $($(PKG)_BASE_NAME)
+endef
+
+define SOURCE_CHECK_BZR
+ $(BZR) ls --quiet $($(PKG)_SITE) > /dev/null
+endef
+
+define DOWNLOAD_CVS
+ $(EXTRA_ENV) $(DL_WRAPPER) -b cvs \
+ -o $(DL_DIR)/$($(PKG)_SOURCE) \
+ $(QUIET) \
+ -- \
+ $(call stripurischeme,$(call qstrip,$($(PKG)_SITE))) \
+ $($(PKG)_DL_VERSION) \
+ $($(PKG)_RAWNAME) \
+ $($(PKG)_BASE_NAME)
+endef
+
+# Not all CVS servers support ls/rls, use login to see if we can connect
+define SOURCE_CHECK_CVS
+ $(CVS) -d:pserver:anonymous:@$(call stripurischeme,$(call qstrip,$($(PKG)_SITE))) login
+endef
+
+define DOWNLOAD_SVN
+ $(EXTRA_ENV) $(DL_WRAPPER) -b svn \
+ -o $(DL_DIR)/$($(PKG)_SOURCE) \
+ $(QUIET) \
+ -- \
+ $($(PKG)_SITE) \
+ $($(PKG)_DL_VERSION) \
+ $($(PKG)_BASE_NAME)
+endef
+
+define SOURCE_CHECK_SVN
+ $(SVN) ls $($(PKG)_SITE)@$($(PKG)_DL_VERSION) > /dev/null
+endef
+
+# SCP URIs should be of the form scp://[user@]host:filepath
+# Note that filepath is relative to the user's home directory, so you may want
+# to prepend the path with a slash: scp://[user@]host:/absolutepath
+define DOWNLOAD_SCP
+ $(EXTRA_ENV) $(DL_WRAPPER) -b scp \
+ -o $(DL_DIR)/$(2) \
+ -H $(PKGDIR)/$($(PKG)_RAWNAME).hash \
+ $(QUIET) \
+ -- \
+ '$(call stripurischeme,$(call qstrip,$(1)))'
+endef
+
+define SOURCE_CHECK_SCP
+ $(SSH) $(call domain,$(1),:) ls '$(call notdomain,$(1),:)' > /dev/null
+endef
+
+define DOWNLOAD_HG
+ $(EXTRA_ENV) $(DL_WRAPPER) -b hg \
+ -o $(DL_DIR)/$($(PKG)_SOURCE) \
+ $(QUIET) \
+ -- \
+ $($(PKG)_SITE) \
+ $($(PKG)_DL_VERSION) \
+ $($(PKG)_BASE_NAME)
+endef
+
+# TODO: improve to check that the given PKG_DL_VERSION exists on the remote
+# repository
+define SOURCE_CHECK_HG
+ $(HG) incoming --force -l1 $($(PKG)_SITE) > /dev/null
+endef
+
+define DOWNLOAD_WGET
+ $(EXTRA_ENV) $(DL_WRAPPER) -b wget \
+ -o $(DL_DIR)/$(2) \
+ -H $(PKGDIR)/$($(PKG)_RAWNAME).hash \
+ $(QUIET) \
+ -- \
+ '$(call qstrip,$(1))'
+endef
+
+define SOURCE_CHECK_WGET
+ $(WGET) --spider '$(call qstrip,$(1))'
+endef
+
+define DOWNLOAD_LOCALFILES
+ $(EXTRA_ENV) $(DL_WRAPPER) -b cp \
+ -o $(DL_DIR)/$(2) \
+ -H $(PKGDIR)/$($(PKG)_RAWNAME).hash \
+ $(QUIET) \
+ -- \
+ $(call stripurischeme,$(call qstrip,$(1)))
+endef
+
+define SOURCE_CHECK_LOCALFILES
+ test -e $(call stripurischeme,$(call qstrip,$(1)))
+endef
+
+################################################################################
+# DOWNLOAD -- Download helper. Will try to download source from:
+# 1) BR2_PRIMARY_SITE if enabled
+# 2) Download site, unless BR2_PRIMARY_SITE_ONLY is set
+# 3) BR2_BACKUP_SITE if enabled, unless BR2_PRIMARY_SITE_ONLY is set
+#
+# Argument 1 is the source location
+#
+# E.G. use like this:
+# $(call DOWNLOAD,$(FOO_SITE))
+################################################################################
+
+define DOWNLOAD
+ $(call DOWNLOAD_INNER,$(1),$(notdir $(1)),DOWNLOAD)
+endef
+
+define SOURCE_CHECK
+ $(call DOWNLOAD_INNER,$(1),$(notdir $(1)),SOURCE_CHECK)
+endef
+
+define DOWNLOAD_INNER
+ $(Q)if test -n "$(call qstrip,$(BR2_PRIMARY_SITE))" ; then \
+ case "$(call geturischeme,$(BR2_PRIMARY_SITE))" in \
+ scp) $(call $(3)_SCP,$(BR2_PRIMARY_SITE)/$(2),$(2)) && exit ;; \
+ *) $(call $(3)_WGET,$(BR2_PRIMARY_SITE)/$(2),$(2)) && exit ;; \
+ esac ; \
+ fi ; \
+ if test "$(BR2_PRIMARY_SITE_ONLY)" = "y" ; then \
+ exit 1 ; \
+ fi ; \
+ if test -n "$(1)" ; then \
+ if test -z "$($(PKG)_SITE_METHOD)" ; then \
+ scheme="$(call geturischeme,$(1))" ; \
+ else \
+ scheme="$($(PKG)_SITE_METHOD)" ; \
+ fi ; \
+ case "$$scheme" in \
+ git) $($(3)_GIT) && exit ;; \
+ svn) $($(3)_SVN) && exit ;; \
+ cvs) $($(3)_CVS) && exit ;; \
+ bzr) $($(3)_BZR) && exit ;; \
+ file) $($(3)_LOCALFILES) && exit ;; \
+ scp) $($(3)_SCP) && exit ;; \
+ hg) $($(3)_HG) && exit ;; \
+ *) $(call $(3)_WGET,$(1),$(2)) && exit ;; \
+ esac ; \
+ fi ; \
+ if test -n "$(call qstrip,$(BR2_BACKUP_SITE))" ; then \
+ $(call $(3)_WGET,$(BR2_BACKUP_SITE)/$(2),$(2)) && exit ; \
+ fi ; \
+ exit 1
+endef
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