Add auto install script and procedure

README.md

@@ -17,12 +17,19 @@ Un fichier "manifeste" (par défaut `scaffold.yml`) peut être créé afin de d
 ```
 go install forge.cadoles.com/wpetit/scaffold/cmd/scaffold
 ```
-
-### À partir des binaires
+### Manuellement, à partir des binaires
 
 1. [Télécharger la dernière version du binaire correspondant à votre plateforme](https://forge.cadoles.com/wpetit/scaffold/releases) (dernière version stable: 0.0.2)
 2. Extraire l'archive et place le binaire `bin/scaffold` dans votre `$PATH` (par exemple dans le répertoire `/usr/local/bin`)
 
+### Automatiquement, via le script d'installation
+
+```shell
+curl -s https://forge.cadoles.com/wpetit/scaffold/raw/branch/master/misc/script/install | bash
+```
+
+L'utilitaire [`jq`](https://stedolan.github.io/jq/) doit être installé sur votre système.
+
 ## Usage
 
 ```

misc/script/install

@@ -0,0 +1,98 @@
+#!/bin/bash
+
+set -eo pipefail
+
+SCAFFOLD_VERSION=${SCAFFOLD_VERSION:-0.0.2}
+RELEASE_INFO_URL=https://forge.cadoles.com/api/v1/repos/wpetit/scaffold/releases/tags/0.0.2
+
+function assert_command_available {
+    local command=$1
+    local command_path=$(which $command)
+
+    if [ -z "$command_path" ]; then
+        echo "The '$command' command could not be found. Please install it before using this script." 1>&2
+        exit 1
+    fi
+}
+
+function fetch_release_info {
+    curl -s -H "accept: application/json" -XGET "${RELEASE_INFO_URL}"
+}
+
+function get_archive_name {
+    local os="$(get_normalized_os)"
+    local arch="$(get_normalized_arch)"
+    echo "scaffold-${os}-${arch}.tar.gz"
+}
+
+function get_normalized_os {
+    echo "$(uname -s | tr '[:upper:]' '[:lower:]')"
+}
+
+function get_normalized_arch {
+    local arch=$(uname -m)
+    case $(uname -m) in
+        i?86)   arch="386" ;;
+        x86_64) arch="amd64" ;;
+        arm[4567]*) arch="arm" ;;
+        arm[8]*) arch="arm64" ;;
+        *) echo 1>&2 "Unsupported architecture '${arch}' !"; exit 1 ;;
+    esac
+    echo "$arch"
+}
+
+function find_attachment_url {
+    local release_info=$1
+    local expected_attachment_name=$2
+
+    echo "${release_info}" | jq -r ".assets[] | select(.name == \"${expected_attachment_name}\") | .browser_download_url"
+}
+
+function download_attachment {
+    local attachment_url=$1
+    local attachment_name=$2
+
+    curl -o "${attachment_name}" "$attachment_url"
+}
+
+function main {
+    assert_command_available 'curl'
+    assert_command_available 'jq'
+    assert_command_available 'tar'
+    assert_command_available 'tr'
+
+    local archive_name="$(get_archive_name)"
+
+    echo "Fetching scaffold release '${SCAFFOLD_VERSION}' informations..."
+    local release_info="$(fetch_release_info)"
+
+    local archive_url=$(find_attachment_url "$release_info" "$archive_name")
+
+    if [ -z "$archive_url" ]; then
+        echo 1>&2 "Could not find archive url !"
+        exit 1
+    fi
+
+    local tmpdir=$(mktemp -d)
+
+    ( 
+        cd "${tmpdir}";
+        
+        echo "Downloading release file '${archive_name}' to '${tmpdir}'..."
+        download_attachment "${archive_url}" "${archive_name}"
+        
+        echo "Extracting archive..."
+        tar -xzf "${archive_name}"
+        
+        local dirname="$(echo "${archive_name}" | cut -f 1 -d '.')"
+
+        echo "Copying scaffold binary to /usr/local/bin..."
+        sudo cp -i "${dirname}/bin/scaffold" /usr/local/bin/
+    )
+
+    rm -rf "${tmpdir}"
+
+    echo "Done."
+}
+
+main