Add section about reproducible build to README

In addition, the build script isn't needed any more.

README.rst

@@ -68,6 +68,15 @@ following principles in mind:
    data should be de-duplicated before it is actually written to the
    storage back end to save precious backup space.
 
+Reproducible Builds
+-------------------
+
+The binaries released with each restic version starting at 0.6.1 are
+[reproducible](https://reproducible-builds.org/), which means that you can
+easily reproduce a byte identical version from the source code for that
+release. Instructions on how to do that are contained in the
+[build repository](https://github.com/restic/build).
+
 News
 ----
 

build_release_binaries.sh

@@ -1,69 +0,0 @@
-#!/bin/bash
-
-set -e
-
-if [[ -z "$VERSION" ]]; then
-    echo '$VERSION unset'
-    exit 1
-fi
-
-if [[ -n "$(git diff)" ]]; then
-    echo 'workspace is dirty'
-    exit 1
-fi
-
-dir=$(mktemp -d --tmpdir restic-release-XXXXXX)
-echo "path is ${dir}"
-
-for R in       \
-    darwin/386     \
-    darwin/amd64   \
-    freebsd/386    \
-    freebsd/amd64  \
-    freebsd/arm    \
-    linux/386      \
-    linux/amd64    \
-    linux/arm      \
-    linux/arm64    \
-    openbsd/386   \
-    openbsd/amd64 \
-    windows/386    \
-    windows/amd64  \
-    ; do \
-
-    OS=$(dirname $R)
-    ARCH=$(basename $R)
-    filename=restic_${VERSION}_${OS}_${ARCH}
-
-    if [[ "$OS" == "windows" ]]; then
-        filename="${filename}.exe"
-    fi
-
-    echo $filename
-
-    go run build.go --goos $OS --goarch $ARCH --output ${filename}
-    if [[ "$OS" == "windows" ]]; then
-        zip ${filename%.exe}.zip ${filename}
-        rm ${filename}
-        mv ${filename%.exe}.zip ${dir}
-    else
-        bzip2 ${filename}
-        mv ${filename}.bz2 ${dir}
-    fi
-done
-
-echo "packing sources"
-git archive --format=tar --prefix=restic-$VERSION/ v$VERSION | gzip -n > restic-$VERSION.tar.gz
-mv restic-$VERSION.tar.gz ${dir}
-
-echo "creating checksums"
-pushd ${dir}
-sha256sum restic_*.{zip,bz2} restic-$VERSION.tar.gz > SHA256SUMS
-gpg --armor --detach-sign SHA256SUMS
-popd
-
-echo "creating source signature file"
-gpg --armor --detach-sign ${dir}/restic-$VERSION.tar.gz
-
-echo
-echo "done, path is ${dir}"