- imported from fedora, needs a lot of love

diff --git a/cargo.spec b/cargo.spec
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+++ b/cargo.spec
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+# Only x86_64 and i686 are Tier 1 platforms at this time.
+# https://forge.rust-lang.org/platform-support.html
+%define rust_arches x86_64 i686 armv7hl aarch64 ppc64 ppc64le s390x
+
+# Only the specified arches will use bootstrap binaries.
+#define bootstrap_arches %%{rust_arches}
+
+%define cargo_version %{version}
+%define cargo_bootstrap 0.18.0
+
+Summary:       Rust's package manager and build tool
+Name:          cargo
+Version:       0.19.0
+Release:       0.1
+License:       ASL 2.0 or MIT
+Source0:       https://github.com/rust-lang/cargo/archive/%{cargo_version}/%{name}-%{cargo_version}.tar.gz
+# submodule, bundled for local installation only, not distributed
+%define rust_installer 4f994850808a572e2cc8d43f968893c8e942e9bf
+Source1:       https://github.com/rust-lang/rust-installer/archive/%{rust_installer}/rust-installer-%{rust_installer}.tar.gz
+
+# Use vendored crate dependencies so we can build offline.
+# Created using https://github.com/alexcrichton/cargo-vendor/ 0.1.7
+# It's so big because some of the -sys crates include the C library source they
+# want to link to.  With our -devel buildreqs in place, they'll be used instead.
+# FIXME: These should all eventually be packaged on their own!
+Source100:     %{name}-%{version}-vendor.tar.xz
+
+URL:           https://crates.io/
+%ifarch %{bootstrap_arches}
+%define bootstrap_root cargo-%{cargo_bootstrap}-%{rust_triple}
+%define local_cargo %{_builddir}/%{bootstrap_root}/cargo/bin/cargo
+%else
+BuildRequires: %{name} >= 0.13.0
+%define local_cargo %{_bindir}/%{name}
+%endif
+
+BuildRequires: cmake
+BuildRequires: gcc
+BuildRequires: rust
+# Indirect dependencies for vendored -sys crates above
+BuildRequires: curl-devel
+BuildRequires: libgit2-devel >= 0.24
+BuildRequires: libssh2-devel
+BuildRequires: openssl-devel
+BuildRequires: pkgconfig
+BuildRequires: zlib-devel
+Requires:      rust
+ExclusiveArch: %{rust_arches}
+
+%define rust_triple %{_target_cpu}-unknown-linux-gnu
+
+%description
+Cargo is a tool that allows Rust projects to declare their various
+dependencies and ensure that you'll always get a repeatable build.
+
+%prep
+%ifarch %{bootstrap_arches}
+%setup -q -n %{bootstrap_root} -T -b %{bootstrap_source}
+test -f '%{local_cargo}'
+%endif
+
+# vendored crates
+%setup -q -n %{name}-%{version}-vendor -T -b 100
+
+# cargo sources
+%setup -q -n %{name}-%{cargo_version}
+
+# rust-installer
+%setup -q -n %{name}-%{cargo_version} -T -D -a 1
+rmdir src/rust-installer
+mv rust-installer-%{rust_installer} src/rust-installer
+
+# define the offline registry
+%define cargo_home $PWD/.cargo
+mkdir -p %{cargo_home}
+cat >.cargo/config <<EOF
+[source.crates-io]
+registry = 'https://github.com/rust-lang/crates.io-index'
+replace-with = 'vendored-sources'
+
+[source.vendored-sources]
+directory = '$PWD/../%{name}-%{version}-vendor'
+EOF
+
+# This should eventually migrate to distro policy
+# Enable optimization, debuginfo, and link hardening.
+%define rustflags -Copt-level=3 -Cdebuginfo=2 -Clink-arg=-Wl,-z,relro,-z,now
+
+%build
+# convince libgit2-sys to use the distro libgit2
+export LIBGIT2_SYS_USE_PKG_CONFIG=1
+
+# use our offline registry and custom rustc flags
+export CARGO_HOME="%{cargo_home}"
+export RUSTFLAGS="%{rustflags}"
+
+%configure \
+       --disable-option-checking \
+       --build=%{rust_triple} --host=%{rust_triple} --target=%{rust_triple} \
+       --rustc=%{_bindir}/rustc --rustdoc=%{_bindir}/rustdoc \
+       --cargo=%{local_cargo} \
+       --release-channel=stable \
+       --disable-cross-tests
+
+%{__make}
+
+%install
+rm -rf $RPM_BUILD_ROOT
+export CARGO_HOME="%{cargo_home}"
+export RUSTFLAGS="%{rustflags}"
+
+%{__make} install \
+       DESTDIR=$RPM_BUILD_ROOT
+
+# Remove installer artifacts (manifests, uninstall scripts, etc.)
+rm -rv $RPM_BUILD_ROOT%{_prefix}/lib/
+
+# Fix the etc/ location
+mv -v $RPM_BUILD_ROOT%{_prefix}/%{_sysconfdir} $RPM_BUILD_ROOT%{_sysconfdir}
+
+# Remove unwanted documentation files (we already package them)
+rm -rf $RPM_BUILD_ROOT%{_docdir}/%{name}/
+
+# Create the path for crate-devel packages
+install -d $RPM_BUILD_ROOT%{_datadir}/cargo/registry
+
+%clean
+rm -rf $RPM_BUILD_ROOT
+
+%files
+%defattr(644,root,root,755)
+%doc LICENSE-APACHE LICENSE-MIT LICENSE-THIRD-PARTY
+%doc README.md
+%attr(755,root,root) %{_bindir}/cargo
+%{_mandir}/man1/cargo*.1*
+%{_sysconfdir}/bash_completion.d/cargo
+%{zsh_compdir}/_cargo
+%dir %{_datadir}/cargo
+%dir %{_datadir}/cargo/registry