Fix install script instructions

1 files changed, 155 insertions, 0 deletions

diff --git a/ci/install.sh b/ci/install.sh
new file mode 100644
index 0000000..2830b7b
--- /dev/null
+++ b/ci/install.sh
@@ -0,0 +1,155 @@
+#!/bin/sh
+
+set -e
+
+help() {
+    cat <<'EOF'
+Install a binary release of a Rust crate hosted on GitHub
+
+Usage:
+    install.sh [options]
+
+Options:
+    -h, --help      Display this message
+    --git SLUG      Get the crate from "https://github/$SLUG"
+    -f, --force     Force overwriting an existing binary
+    --crate NAME    Name of the crate to install (default <repository name>)
+    --tag TAG       Tag (version) of the crate to install (default <latest release>)
+    --target TARGET Install the release compiled for $TARGET (default <`rustc` host>)
+    --to LOCATION   Where to install the binary (default ~/.cargo/bin)
+EOF
+}
+
+say() {
+    echo "install.sh: $1"
+}
+
+say_err() {
+    say "$1" >&2
+}
+
+err() {
+    if [ ! -z $td ]; then
+        rm -rf $td
+    fi
+
+    say_err "ERROR $1"
+    exit 1
+}
+
+need() {
+    if ! command -v $1 > /dev/null 2>&1; then
+        err "need $1 (command not found)"
+    fi
+}
+
+force=false
+while test $# -gt 0; do
+    case $1 in
+        --crate)
+            crate=$2
+            shift
+            ;;
+        --force | -f)
+            force=true
+            ;;
+        --git)
+            git=$2
+            shift
+            ;;
+        --help | -h)
+            help
+            exit 0
+            ;;
+        --tag)
+            tag=$2
+            shift
+            ;;
+        --target)
+            target=$2
+            shift
+            ;;
+        --to)
+            dest=$2
+            shift
+            ;;
+        *)
+            ;;
+    esac
+    shift
+done
+
+# Dependencies
+need basename
+need curl
+need install
+need mkdir
+need mktemp
+need tar
+
+# Optional dependencies
+if [ -z $crate ] || [ -z $tag ] || [ -z $target ]; then
+    need cut
+fi
+
+if [ -z $tag ]; then
+    need rev
+fi
+
+if [ -z $target ]; then
+    need grep
+    need rustc
+fi
+
+if [ -z $git ]; then
+    err 'must specify a git repository using `--git`. Example: `install.sh --git japaric/cross`'
+fi
+
+url="https://github.com/$git"
+say_err "GitHub repository: $url"
+
+if [ -z $crate ]; then
+    crate=$(echo $git | cut -d'/' -f2)
+fi
+
+say_err "Crate: $crate"
+
+url="$url/releases"
+
+if [ -z $tag ]; then
+    tag=$(curl -s "$url/latest" | cut -d'"' -f2 | rev | cut -d'/' -f1 | rev)
+    say_err "Tag: latest ($tag)"
+else
+    say_err "Tag: $tag"
+fi
+
+if [ -z $target ]; then
+    target=$(rustc -Vv | grep host | cut -d' ' -f2)
+fi
+
+say_err "Target: $target"
+
+if [ -z $dest ]; then
+    dest="$HOME/.cargo/bin"
+fi
+
+say_err "Installing to: $dest"
+
+url="$url/download/$tag/$crate-$tag-$target.tar.gz"
+
+say_err "Downloading: $url"
+td=$(mktemp -d || mktemp -d -t tmp)
+curl -sL $url | tar -C $td -xz
+
+for f in $(cd $td && find . -type f); do
+    test -x $td/$f || continue
+
+    if [ -e "$dest/$f" ] && [ $force = false ]; then
+        err "$f already exists in $dest"
+    else
+        mkdir -p $dest
+        install -v -m 755 $td/$f $dest
+    fi
+done
+
+rm -rf $td