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       emvendor - retrieve vendor-specific package configuration strings


        emvendor -V|--vendor VENDOR -p|--package PACKAGE -k|--key KEY
        emvendor -?|-h|--help|--version


        -v|--vendor VENDOR:    the vendor name from dpkg-vendor
        -p|--package PACKAGE:  the package name (usually source)
        -k|--key KEY:          arbitrary string for the key of the data

       All commands must be specified every time.

       On success, the string is printed and emvendor exits with zero.

       In the case of error, emvendor dies with an empty string on STDERR and
       exits with a non-zero return value.


       emvendor provides a way for debian/rules to call in a string for a
       particular package that fits into the rules for that package and
       conforms to the requirements of the vendor.

       It is fairly obvious that specifying each vendor in the debian/rules
       file of each package is not going to be particularly flexible.

        DEB_VENDOR=$(shell dpkg-vendor --query vendor)
        ifeq (Debian,$(DEB_VENDOR))
         # Debian build
         EXCONFARGS=--disable-mono --disable-monodoc
         # any-vendor build
         EXCONFARGS=$(shell emvendor --vendor $(DEB_VENDOR) --package avahi --key EXCONFARGS)

       or use the short options:

        EXCONFARGS=$(shell foo-bar -V $(DEB_VENDOR) -p avahi -k EXCONFARGS)

       The values themselves are in a vendor-specific conf file in

        $ cat /etc/foo-bar.d/emdebian-crush
        EXCONFARGS=--disable-mono --disable-monodoc --disable-python
        --disable-doxygen-doc --disable-pygtk --disable-python-dbus
        --disable-core-docs --disable-qt3 --disable-qt4 --disable-gobject
        --with-distro debian


       (Note that the value has to be all on one line which is a little
       awkward - also note that values are not able to include the equals sign
       which could be more of an issue.)

       Packages that need two strings can do so - the key string is entirely
       arbitrary as long as it fits in the style of a typical ini file.

       Therefore, the key can be matched to the needs of the relevant package.

       "emdebian-buildsupport" provides /etc/emvendor.d/emdebian-crush with
       all the content for all packages that need such details.

emvendor and dpkg-vendor

       dpkg-vendor supports vendor functionality but emvendor adds an extra
       hierarchy, organised by Debian source package name. It would be
       possible to include the relevant strings in /etc/dpkg/origins/vendor
       but each identifier string would need to be unique across all packages
       for each vendor, which is an unrealistic limitation.