Use vendored dependency in RHEL builds

RHEL does not ship individual Rust package dependencies.

.gitignore

@@ -10,3 +10,4 @@
 /zram-generator-1.1.0.crate
 /zram-generator-1.1.1.crate
 /zram-generator-1.1.2.crate
+/zram-generator-1.1.2-vendor.tar.xz

rust-zram-generator.spec

@@ -1,6 +1,13 @@
 # Generated by rust2rpm 19
 %bcond_without check
 
+# RHEL does not have packages for Rust dependencies
+%if 0%{?rhel}
+%global bundled_rust_deps 1
+%else
+%global bundled_rust_deps 0
+%endif
+
 %global crate zram-generator
 
 Name:           rust-%{crate}
@@ -13,10 +20,21 @@ License:        MIT
 URL:            https://crates.io/crates/zram-generator
 Source:         %{crates_source}
 Source1:        zram-generator.conf
+# To create the vendor tarball:
+#   tar xf %%{crate}-%%{version}.crate ; pushd %%{crate}-%%{version} ; \
+#   cargo vendor && tar Jcvf ../%%{crate}-%%{version}-vendor.tar.xz vendor/ ; popd
+Source2:        %{crate}-%{version}-vendor.tar.xz
 
 ExclusiveArch:  %{rust_arches}
 
+%if 0%{?bundled_rust_deps}
+BuildRequires:  rust-toolset
+BuildRequires:  make
+BuildRequires:  /usr/bin/ronn
+BuildRequires:  systemd-rpm-macros
+%else
 BuildRequires:  rust-packaging
+%endif
 
 %global _description %{expand:
 This is a systemd unit generator that enables swap on zram.
@@ -57,6 +75,7 @@ BuildArch:      noarch
 %files       -n %{crate}-defaults
 %{_prefix}/lib/systemd/zram-generator.conf
 
+%if ! 0%{?bundled_rust_deps}
 %package        devel
 Summary:        %{summary}
 BuildArch:      noarch
@@ -82,10 +101,14 @@ which use "default" feature of "%{crate}" crate.
 
 %files       -n %{name}+default-devel
 %ghost %{cargo_registry}/%{crate}-%{version_no_tilde}/Cargo.toml
+%endif
 
 %prep
 %autosetup -n %{crate}-%{version_no_tilde} -p1
 cp -a %{S:1} .
+%if 0%{?bundled_rust_deps}
+%cargo_prep -V 2
+%else
 %cargo_prep
 
 %generate_buildrequires
@@ -93,6 +116,7 @@ cp -a %{S:1} .
 echo '/usr/bin/make'
 echo '/usr/bin/ronn'
 echo 'systemd-rpm-macros'
+%endif
 
 %build
 export SYSTEMD_UTIL_DIR=%{_systemd_util_dir}

sources

@@ -1 +1,2 @@
 SHA512 (zram-generator-1.1.2.crate) = dfad7d4384eb4635c33475e4571d33a3135c92cf42138dd1cb50f19aef4b3f2465130783e385a3f544e43a1653273cee9b2d8f45177a8b053acf37805dc939c8
+SHA512 (zram-generator-1.1.2-vendor.tar.xz) = 0d628fd3543ea2351d628a0fb61603cb838050050b1766a4c8c45e5de3a6513d724ca4d97081e112cf8accb9c23045a2b0a3de556374020bedb87ead310e9cf2