spec: debian: monitoring: build jsonnet from source to use 0.18.0

As this new version is recently released it's still not in every distro
we use. We now build jsonnet from source so that we can use this new
version of jsonnet. This commit could be reverted later on when the new
version would be available everywhere.

Signed-off-by: Arthur Outhenin-Chalandre <arthur.outhenin-chalandre@cern.ch>

ceph.spec.in

@@ -345,7 +345,6 @@ BuildRequires:	lz4-devel >= 1.7
 BuildRequires:	golang
 %if 0%{?fedora} || 0%{?rhel}
 BuildRequires:	golang-github-prometheus
-BuildRequires:	jsonnet
 BuildRequires:	libtool-ltdl-devel
 BuildRequires:	ninja-build
 BuildRequires:	xmlsec1
@@ -364,7 +363,6 @@ BuildRequires:	python%{python3_pkgversion}-pyOpenSSL
 %endif
 %if 0%{?suse_version}
 BuildRequires:	golang-github-prometheus-prometheus
-BuildRequires:	jsonnet
 BuildRequires:	libxmlsec1-1
 BuildRequires:	libxmlsec1-nss1
 BuildRequires:	libxmlsec1-openssl1

debian/control

@@ -24,7 +24,6 @@ Build-Depends: automake,
                hostname <pkg.ceph.check>,
                javahelper,
                jq <pkg.ceph.check>,
-               jsonnet <pkg.ceph.check>,
                junit4,
                libaio-dev,
                libbabeltrace-ctf-dev,

monitoring/ceph-mixin/CMakeLists.txt

@@ -17,6 +17,17 @@ if(WITH_GRAFANA)
       BUILD_IN_SOURCE 1
       INSTALL_COMMAND cp <SOURCE_DIR>/_output/jb <INSTALL_DIR>)
 
+    ExternalProject_Add(jsonnet
+      GIT_REPOSITORY "https://github.com/google/go-jsonnet.git"
+      GIT_TAG "v0.18.0"
+      GIT_SHALLOW TRUE
+      SOURCE_DIR ${CMAKE_CURRENT_BINARY_DIR}/src
+      CONFIGURE_COMMAND ""
+      DOWNLOAD_DIR ${CMAKE_CURRENT_BINARY_DIR}/src
+      BUILD_COMMAND make build
+      BUILD_IN_SOURCE 1
+      INSTALL_COMMAND cp <SOURCE_DIR>/_output/jsonnet <INSTALL_DIR>)
+
     set(CEPH_BUILD_VIRTUALENV $ENV{TMPDIR})
     if(NOT CEPH_BUILD_VIRTUALENV)
       include(AddCephTest)

monitoring/ceph-mixin/README.md

@@ -40,7 +40,7 @@ file, developers should include any necessary changes to the MIB.
 
 ### Building from Jsonnet
 
-- Install [jsonnet](https://jsonnet.org/)
+- Install [jsonnet](https://jsonnet.org/) (at least v0.18.0)
     - By installing the package `jsonnet` in most of the distro and
       `golang-github-google-jsonnet` in fedora
 - Install [jsonnet-bundler](https://github.com/jsonnet-bundler/jsonnet-bundler)