package/pkg-rebar.mk

   1 ################################################################################
   2 # rebar package infrastructure for Erlang packages
   3 #
   4 # This file implements an infrastructure that eases development of
   5 # package .mk files for rebar packages.  It should be used for all
   6 # packages that use rebar as their build system.
   7 #
   8 # In terms of implementation, this rebar infrastructure requires the
   9 # .mk file to only specify metadata information about the package:
  10 # name, version, download URL, etc.
  11 #
  12 # We still allow the package .mk file to override what the different
  13 # steps are doing, if needed. For example, if <PKG>_BUILD_CMDS is
  14 # already defined, it is used as the list of commands to perform to
  15 # build the package, instead of the default rebar behaviour. The
  16 # package can also define some post operation hooks.
  17 #
  18 ################################################################################
  19
  20 # Directories to store rebar dependencies in.
  21 #
  22 # These directories actually only contain symbolic links to Erlang
  23 # applications in either $(HOST_DIR) or $(STAGING_DIR).  One needs
  24 # them to avoid rebar complaining about missing dependencies, as this
  25 # infrastructure tells rebar to NOT download dependencies during
  26 # the build stage.
  27 #
  28 REBAR_HOST_DEPS_DIR = $(HOST_DIR)/usr/share/rebar/deps
  29 REBAR_TARGET_DEPS_DIR = $(STAGING_DIR)/usr/share/rebar/deps
  30
  31 # Tell rebar where to find the dependencies
  32 #
  33 REBAR_HOST_DEPS_ENV = \
  34         ERL_COMPILER_OPTIONS='{i, "$(REBAR_HOST_DEPS_DIR)"}' \
  35         ERL_EI_LIBDIR=$(HOST_DIR)/usr/lib/erlang/lib/erl_interface-$(ERLANG_EI_VSN)/lib
  36 REBAR_TARGET_DEPS_ENV = \
  37         ERL_COMPILER_OPTIONS='{i, "$(REBAR_TARGET_DEPS_DIR)"}' \
  38         ERL_EI_LIBDIR=$(STAGING_DIR)/usr/lib/erlang/lib/erl_interface-$(ERLANG_EI_VSN)/lib
  39
  40 ################################################################################
  41 # Helper functions
  42 ################################################################################
  43
  44 # Install an Erlang application from $(@D).
  45 #
  46 # i.e., define a recipe that installs the "bin ebin priv $(2)" directories
  47 # from $(@D) to $(1)$($(PKG)_ERLANG_LIBDIR).
  48 #
  49 #  argument 1 should typically be $(HOST_DIR), $(TARGET_DIR),
  50 #             or $(STAGING_DIR).
  51 #  argument 2 is typically empty when installing in $(TARGET_DIR) and
  52 #             "include" when installing in $(HOST_DIR) or
  53 #             $(STAGING_DIR).
  54 #
  55 # Note: calling this function must be done with $$(call ...) because it
  56 # expands package-related variables.
  57 #
  58 define install-erlang-directories
  59         $(INSTALL) -d $(1)/$($(PKG)_ERLANG_LIBDIR)
  60         for dir in bin ebin priv $(2); do                               \
  61                 if test -d $(@D)/$$dir; then                            \
  62                         cp -r $(@D)/$$dir $(1)$($(PKG)_ERLANG_LIBDIR);  \
  63                 fi;                                                     \
  64         done
  65 endef
  66
  67 # Setup a symbolic link in rebar's deps_dir to the actual location
  68 # where an Erlang application is installed.
  69 #
  70 # i.e., define a recipe that creates a symbolic link
  71 # from $($(PKG)_REBAR_DEPS_DIR)/$($(PKG)_ERLANG_APP)
  72 # to $(1)$($(PKG)_ERLANG_LIBDIR).
  73 #
  74 # For target packages for example, one uses this to setup symbolic
  75 # links from $(STAGING_DIR)/usr/share/rebar/deps/<erlang-app> to
  76 # $(STAGING_DIR)/usr/lib/erlang/lib/<erlang-app>-<version>. This
  77 # infrastructure points rebar at the former in order to tell rebar to
  78 # NOT download dependencies during the build stage, and instead use
  79 # the already available dependencies.
  80 #
  81 # Therefore,
  82 #  argument 1 is $(HOST_DIR) (for host packages) or
  83 #             $(STAGING_DIR) (for target packages).
  84 #
  85 #  argument 2 is HOST (for host packages) or
  86 #             TARGET (for target packages).
  87 #
  88 # Note: calling this function must be done with $$(call ...) because it
  89 # expands package-related variables.
  90 #
  91 define install-rebar-deps
  92         $(INSTALL) -d $(REBAR_$(2)_DEPS_DIR)
  93         ln -f -s $(1)/$($(PKG)_ERLANG_LIBDIR) \
  94                 $(REBAR_$(2)_DEPS_DIR)/$($(PKG)_ERLANG_APP)
  95 endef
  96
  97 ################################################################################
  98 # inner-rebar-package -- defines how the configuration, compilation
  99 # and installation of a rebar package should be done, implements a few
 100 # hooks to tune the build process according to rebar specifities, and
 101 # calls the generic package infrastructure to generate the necessary
 102 # make targets.
 103 #
 104 #  argument 1 is the lowercase package name
 105 #  argument 2 is the uppercase package name, including a HOST_ prefix
 106 #             for host packages
 107 #  argument 3 is the uppercase package name, without the HOST_ prefix
 108 #             for host packages
 109 #  argument 4 is the type (target or host)
 110 #
 111 ################################################################################
 112
 113 define inner-rebar-package
 114
 115 # Extract just the raw package name, lowercase without the leading
 116 # erlang- or host- prefix, as this is used by rebar to find the
 117 # dependencies a package specifies.
 118 #
 119 $(2)_ERLANG_APP = $(subst -,_,$(patsubst erlang-%,%,$(patsubst host-%,%,$(1))))
 120
 121 # Path where to store the package's libs, relative to either $(HOST_DIR)
 122 # for host packages, or $(STAGING_DIR) for target packages.
 123 #
 124 $(2)_ERLANG_LIBDIR = \
 125         /usr/lib/erlang/lib/$$($$(PKG)_ERLANG_APP)-$$($$(PKG)_VERSION)
 126
 127 # If a host package, inherit <pkg>_USE_BUNDLED_REBAR from the target
 128 # package, if not explicitly defined. Otherwise, default to NO.
 129 ifndef $(2)_USE_BUNDLED_REBAR
 130  ifdef $(3)_USE_BUNDLED_REBAR
 131   $(2)_USE_BUNDLED_REBAR = $$($(3)_USE_BUNDLED_REBAR)
 132  else
 133   $(2)_USE_BUNDLED_REBAR ?= NO
 134  endif
 135 endif
 136
 137 # If a host package, inherit <pkg>_USE_AUTOCONF from the target
 138 # package, if not explicitly defined. Otherwise, default to NO.
 139 ifndef $(2)_USE_AUTOCONF
 140  ifdef $(3)_USE_AUTOCONF
 141   $(2)_USE_AUTOCONF = $$($(3)_USE_AUTOCONF)
 142  else
 143   $(2)_USE_AUTOCONF ?= NO
 144  endif
 145 endif
 146
 147 # Define the build and install commands
 148 #
 149 ifeq ($(4),target)
 150
 151 # Target packages need the erlang interpreter on the target
 152 $(2)_DEPENDENCIES += erlang
 153
 154 # Used only if the package uses autotools underneath; otherwise, ignored
 155 $(2)_CONF_ENV += $$(REBAR_TARGET_DEPS_ENV)
 156
 157 ifndef $(2)_BUILD_CMDS
 158 define $(2)_BUILD_CMDS
 159         (cd $$(@D); \
 160                 CC="$$(TARGET_CC)" \
 161                 CXX="$$(TARGET_CXX)" \
 162                 CFLAGS="$$(TARGET_CFLAGS)" \
 163                 CXXFLAGS="$$(TARGET_CXXFLAGS)" \
 164                 LDFLAGS="$$(TARGET_LDFLAGS)" \
 165                 $$(REBAR_TARGET_DEPS_ENV) \
 166                 $$(TARGET_MAKE_ENV) \
 167                 $$($$(PKG)_REBAR_ENV) $$($$(PKG)_REBAR) deps_dir=$$(REBAR_TARGET_DEPS_DIR) compile \
 168         )
 169 endef
 170 endif
 171
 172 # We need to double-$ the 'call' because it wants to expand
 173 # package-related variables
 174 ifndef $(2)_INSTALL_STAGING_CMDS
 175 define $(2)_INSTALL_STAGING_CMDS
 176         $$(call install-erlang-directories,$$(STAGING_DIR),include)
 177         $$(call install-rebar-deps,$$(STAGING_DIR),TARGET)
 178 endef
 179 endif
 180
 181 # We need to double-$ the 'call' because it wants to expand
 182 # package-related variables
 183 ifndef $(2)_INSTALL_TARGET_CMDS
 184 define $(2)_INSTALL_TARGET_CMDS
 185         $$(call install-erlang-directories,$$(TARGET_DIR))
 186 endef
 187 endif
 188
 189 else # !target
 190
 191 # Host packages need the erlang interpreter on the host
 192 $(2)_DEPENDENCIES += host-erlang
 193
 194 # Used only if the package uses autotools underneath; otherwise, ignored
 195 $(2)_CONF_ENV += $$(REBAR_HOST_DEPS_ENV)
 196
 197 ifndef $(2)_BUILD_CMDS
 198 define $(2)_BUILD_CMDS
 199         (cd $$(@D); \
 200                 CC="$$(HOSTCC)" \
 201                 CFLAGS="$$(HOST_CFLAGS)" \
 202                 LDFLAGS="$$(HOST_LDFLAGS)" \
 203                 $$(REBAR_HOST_DEPS_ENV) \
 204                 $$(HOST_MAKE_ENV) \
 205                 $$($$(PKG)_REBAR_ENV) $$($$(PKG)_REBAR) deps_dir=$$(REBAR_HOST_DEPS_DIR) compile \
 206         )
 207 endef
 208 endif
 209
 210 # We need to double-$ the 'call' because it wants to expand
 211 # package-related variables
 212 ifndef $(2)_INSTALL_CMDS
 213 define $(2)_INSTALL_CMDS
 214         $$(call install-erlang-directories,$$(HOST_DIR),include)
 215         $$(call install-rebar-deps,$$(HOST_DIR),HOST)
 216 endef
 217 endif
 218
 219 endif # !target
 220
 221 # Whether to use the generic rebar or the package's bundled rebar
 222 #
 223 ifeq ($$($(2)_USE_BUNDLED_REBAR),YES)
 224 $(2)_REBAR = ./rebar
 225 else
 226 $(2)_REBAR = rebar
 227 $(2)_DEPENDENCIES += host-erlang-rebar
 228 endif
 229
 230 # The package sub-infra to use
 231 #
 232 ifeq ($$($(2)_USE_AUTOCONF),YES)
 233 $(call inner-autotools-package,$(1),$(2),$(3),$(4))
 234 else
 235 $(call inner-generic-package,$(1),$(2),$(3),$(4))
 236 endif
 237
 238 endef # inner-rebar-package
 239
 240 rebar-package = $(call inner-rebar-package,$(pkgname),$(call UPPERCASE,$(pkgname)),$(call UPPERCASE,$(pkgname)),target)
 241 host-rebar-package = $(call inner-rebar-package,host-$(pkgname),$(call UPPERCASE,host-$(pkgname)),$(call UPPERCASE,$(pkgname)),host)