Fix fpm installation on openSUSE 15.4; switch to nfpm

fpm currently fails to install because the public_suffix gem dependency
requires Ruby 2.6, which openSUSE 15.4 doesn't provide. Because there have
been so many Ruby dependency issues with fpm in the past, switch to the fewer-
dependency nfpm, which also has better support for code signing if we want to
do that in the future.

builder/Dockerfile.opensuse-154

@@ -40,8 +40,6 @@ RUN zypper --non-interactive --gpg-auto-import-keys -n install \
     perl-macros \
     readline-devel \
     rpm-build \
-    ruby \
-    ruby-devel \
     shadow \
     tcl-devel \
     texinfo \
@@ -74,8 +72,9 @@ RUN curl "https://awscli.amazonaws.com/awscli-exe-linux-x86_64.zip" -o "awscliv2
     ./aws/install && \
     rm -rf aws awscliv2.zip
 
-RUN gem install fpm && \
+RUN curl -LO https://github.com/goreleaser/nfpm/releases/download/v2.18.1/nfpm_amd64.rpm && \
-    ln -s /usr/bin/fpm.ruby2.5 /usr/local/bin/fpm
+    zypper --non-interactive --no-gpg-checks install nfpm_amd64.rpm && \
+    rm nfpm_amd64.rpm
 
 RUN chmod 0777 /opt
 

builder/package.opensuse-154

@@ -1,7 +1,7 @@
 #!/bin/bash
 
-if [[ ! -d /tmp/output/opensuse-154 ]]; then
+if [[ ! -d /tmp/output/${OS_IDENTIFIER} ]]; then
-  mkdir -p /tmp/output/opensuse-154
+  mkdir -p "/tmp/output/${OS_IDENTIFIER}"
 fi
 
 # R 3.x requires PCRE1
@@ -39,49 +39,59 @@ if [ -d /opt/R/${R_VERSION} ]; then
 fi
 EOF
 
-fpm \
+cat <<EOF > /tmp/nfpm.yml
-  -s dir \
+name: R-${R_VERSION}
-  -t rpm \
+version: 1
-  -v 1 \
+version_schema: none
-  -n "R-${R_VERSION}" \
+release: 1
-  --vendor "RStudio, PBC" \
+maintainer: RStudio, PBC <https://github.com/rstudio/r-builds>
-  --url "http://www.r-project.org/" \
+description: |
-  --description "GNU R statistical computation and graphics system" \
+  GNU R statistical computation and graphics system
-  --maintainer "RStudio, PBC <https://github.com/rstudio/r-builds>" \
+vendor: RStudio, PBC
-  --license "GPLv2" \
+homepage: https://www.r-project.org
-  --after-install /post-install.sh \
+license: GPLv2+
-  --after-remove /after-remove.sh \
+depends:
-  -p /tmp/output/opensuse-154/ \
+- fontconfig
-  -d fontconfig \
+- gcc
-  -d gcc \
+- gcc-c++
-  -d gcc-c++ \
+- gcc-fortran
-  -d gcc-fortran \
+- glibc-locale
-  -d glibc-locale \
+- gzip
-  -d gzip \
+- icu.691-devel
-  -d icu.691-devel \
+- libbz2-devel
-  -d libbz2-devel \
+- libcairo2
-  -d libcairo2 \
+- libcurl-devel
-  -d libcurl-devel \
+- libfreetype6
-  -d libfreetype6 \
+- libgomp1
-  -d libgomp1 \
+- libjpeg62
-  -d libjpeg62 \
+- libopenblas_pthreads-devel
-  -d libopenblas_pthreads-devel \
+- libpango-1_0-0
-  -d libpango-1_0-0 \
+- libreadline7
-  -d libreadline7 \
+- libtiff5
-  -d libtiff5 \
+- make
-  -d make \
+- ${pcre_lib}
-  -d ${pcre_lib} \
+- tar
-  -d tar \
+- tcl
-  -d tcl \
+- tk
-  -d tk \
+- unzip
-  -d unzip \
+- which
-  -d which \
+- xorg-x11
-  -d xorg-x11 \
+- xorg-x11-fonts-100dpi
-  -d xorg-x11-fonts-100dpi \
+- xorg-x11-fonts-75dpi
-  -d xorg-x11-fonts-75dpi \
+- xz-devel
-  -d xz-devel \
+- zip
-  -d zip \
+- zlib-devel
-  -d zlib-devel \
+contents:
-  "/opt/R/${R_VERSION}"
+- src: /opt/R/${R_VERSION}
+  dst: /opt/R/${R_VERSION}
+scripts:
+  postinstall: /post-install.sh
+  postremove: /after-remove.sh
+EOF
 
-export PKG_FILE=$(ls /tmp/output/opensuse-154/R-${R_VERSION}*.rpm | head -1)
+nfpm package \
+  -f /tmp/nfpm.yml \
+  -p rpm \
+  -t "/tmp/output/${OS_IDENTIFIER}"
+
+export PKG_FILE=$(ls /tmp/output/${OS_IDENTIFIER}/R-${R_VERSION}*.rpm | head -1)