[tarantool-patches] [PATCH] debian: don't install systemd service file twice

[Alexander Turenko <alexander.turenko@tarantool.org>]

It fixes the following errors during tarantool installation from
packages on debian / ubuntu:

```
Unpacking tarantool (1.9.1.23.gacbd91c-1) ...
dpkg: error processing archive /var/cache/apt/archives/tarantool_1.9.1.23.gacbd91c-1_amd64.deb (--unpack):
 trying to overwrite '/lib/systemd/system/tarantool.service', which is also in package tarantool-common 1.9.1.23.gacbd91c-1
```

The problem is that tarantool.service file was shipped with
tarantool-common and tarantool packages both. It is the regression after
8925b8622f381378684de633e917229051e3482f.

The way to avoid installing / enabling the service file within tarantool
package is to pass `--name` option to dh_systemd_enable, but do not pass
the service file name. In that case dh_systemd_enable does not found the
service file and does not enforce existence of the file.

Hope there is less hacky way to do so, but I don't found one at the
moment.
---

issue: no
branch: Totktonada/fix-debian-packages
travis-ci: https://travis-ci.org/tarantool/tarantool/builds/389768109

 debian/rules | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/debian/rules b/debian/rules
index f3be35edc..edfecfc33 100755
--- a/debian/rules
+++ b/debian/rules
@@ -20,9 +20,12 @@ DEB_CMAKE_EXTRA_FLAGS := \
 	-DWITH_SYSVINIT=ON \
 	-DWITH_SYSTEMD=$(WITH_SYSTEMD)
 
-DEB_DH_INSTALLINIT_ARGS    := --name=tarantool
+# Install tarantool.service within tarantool-common package, but does not
+# install it within tarantool and tarantool-dev packages.
+DEB_DH_INSTALLINIT_ARGS                     := --name=tarantool
+DEB_DH_SYSTEMD_ENABLE_ARGS_tarantool        := --name=tarantool
 DEB_DH_SYSTEMD_ENABLE_ARGS_tarantool-common := --name=tarantool tarantool.service
-DEB_DH_SYSTEMD_START_ARGS_tarantool-common := --no-restart-on-upgrade tarantool.service
+DEB_DH_SYSTEMD_START_ARGS_tarantool-common  := --no-restart-on-upgrade tarantool.service
 
 # Needed for proper backtraces in fiber.info()
 DEB_DH_STRIP_ARGS	        := -X/usr/bin/tarantool
-- 
2.17.1