Install packages required for installation if not installed

.github/.cspell/project-dictionary.txt

@@ -1,5 +1,7 @@
 binstall
 bytecodealliance
+distro
+doas
 Dpkg
 jfrimmel
 koalaman

.github/workflows/ci.yml

@@ -75,10 +75,10 @@ jobs:
         run: |
           set -ex
           apt-get -o Acquire::Retries=10 -qq update
-          apt-get -o Acquire::Retries=10 -qq -o Dpkg::Use-Pty=0 install -y --no-install-recommends ca-certificates cargo curl unzip xz-utils
+          apt-get -o Acquire::Retries=10 -qq -o Dpkg::Use-Pty=0 install -y --no-install-recommends cargo
         if: startsWith(matrix.container, 'ubuntu') || startsWith(matrix.container, 'debian')
       - name: Install requirements (alpine)
-        run: apk add bash cargo curl tar xz
+        run: apk add bash cargo
         shell: sh
         if: startsWith(matrix.container, 'alpine')
       - uses: ./

CHANGELOG.md

@@ -10,6 +10,12 @@ Note: In this file, do not use the hard wrap in the middle of a sentence for com
 
 ## [Unreleased]
 
+- If the host environment lacks packages required for installation, such as `curl` or `tar`, install them if possible.
+
+  It is mainly intended to make the use of this action easy on containers or self-hosted runners, and currently supports Debian-based distributions (including Ubuntu) and Alpine.
+
+  The system's package manager is used for these installations. However, bash, which is an execution requirement of the action itself, and rustc, which is usually preferred for installation by rustup rather than the system's package manager, are *not* covered by these installations.
+
 ## [1.15.5] - 2022-12-13
 
 - Update `shellcheck@latest` to 0.9.0.

main.sh

@@ -47,9 +47,29 @@ download() {
     local tar_args=()
     case "${url}" in
         *.tar.gz | *.tgz) tar_args+=("xzf") ;;
-        *.tar.bz2 | *.tbz2) tar_args+=("xjf") ;;
-        *.tar.xz | *.txz) tar_args+=("xJf") ;;
+        *.tar.bz2 | *.tbz2)
+            tar_args+=("xjf")
+            if ! type -P bzip2 &>/dev/null; then
+                case "${base_distro}" in
+                    debian | alpine) sys_install bzip2 ;;
+                esac
+            fi
+            ;;
+        *.tar.xz | *.txz)
+            tar_args+=("xJf")
+            if ! type -P xz &>/dev/null; then
+                case "${base_distro}" in
+                    debian) sys_install xz-utils ;;
+                    alpine) sys_install xz ;;
+                esac
+            fi
+            ;;
         *.zip)
+            if ! type -P unzip &>/dev/null; then
+                case "${base_distro}" in
+                    debian | alpine) sys_install unzip ;;
+                esac
+            fi
             mkdir -p .install-action-tmp
             (
                 cd .install-action-tmp
@@ -133,8 +153,12 @@ apt_update() {
     else
         retry apt-get -o Acquire::Retries=10 -qq update
     fi
+    apt_updated=1
 }
 apt_install() {
+    if [[ -z "${apt_updated:-}" ]]; then
+        apt_update
+    fi
     if type -P sudo &>/dev/null; then
         retry sudo apt-get -o Acquire::Retries=10 -qq -o Dpkg::Use-Pty=0 install -y --no-install-recommends "$@"
     else
@@ -155,6 +179,19 @@ snap_install() {
         retry snap install "$@"
     fi
 }
+apk_install() {
+    if type -P doas &>/dev/null; then
+        doas apk add "$@"
+    else
+        apk add "$@"
+    fi
+}
+sys_install() {
+    case "${base_distro}" in
+        debian) apt_install "$@" ;;
+        alpine) apk_install "$@" ;;
+    esac
+}
 
 if [[ $# -gt 0 ]]; then
     bail "invalid argument '$1'"
@@ -169,17 +206,21 @@ if [[ -n "${tool}" ]]; then
     while read -rd,; do tools+=("${REPLY}"); done <<<"${tool},"
 fi
 
-# Refs: https://github.com/rust-lang/rustup/blob/HEAD/rustup-init.sh
+base_distro=""
+exe=""
 case "${OSTYPE}" in
     linux*)
         host_env="gnu"
+        # Refs: https://github.com/rust-lang/rustup/blob/HEAD/rustup-init.sh
         if (ldd --version 2>&1 || true) | grep -q 'musl'; then
             host_env="musl"
         fi
+        if grep -q '^ID_LIKE=' /etc/os-release; then
+            base_distro="$(grep '^ID_LIKE=' /etc/os-release | sed 's/^ID_LIKE=//')"
+        else
+            base_distro="$(grep '^ID=' /etc/os-release | sed 's/^ID=//')"
+        fi
         ;;
-esac
-exe=""
-case "${OSTYPE}" in
     cygwin* | msys*) exe=".exe" ;;
 esac
 
@@ -188,6 +229,12 @@ if [[ ! -d "${cargo_bin}" ]]; then
     cargo_bin=/usr/local/bin
 fi
 
+if ! type -P curl &>/dev/null || ! type -P tar &>/dev/null; then
+    case "${base_distro}" in
+        debian | alpine) sys_install ca-certificates curl tar ;;
+    esac
+fi
+
 for tool in "${tools[@]}"; do
     if [[ "${tool}" == *"@"* ]]; then
         version="${tool#*@}"
@@ -354,6 +401,11 @@ for tool in "${tools[@]}"; do
                 cygwin* | msys*) url="${base_url}-win64.zip" ;;
                 *) bail "unsupported OSTYPE '${OSTYPE}' for ${tool}" ;;
             esac
+            if ! type -P unzip &>/dev/null; then
+                case "${base_distro}" in
+                    debian | alpine) sys_install unzip ;;
+                esac
+            fi
             mkdir -p .install-action-tmp
             (
                 cd .install-action-tmp
@@ -437,7 +489,6 @@ for tool in "${tools[@]}"; do
                 darwin* | cygwin* | msys*) bail "${tool} for non-linux is not supported yet by this action" ;;
                 *) bail "unsupported OSTYPE '${OSTYPE}' for ${tool}" ;;
             esac
-            apt_update
             # libc6-dbg is needed to run Valgrind
             apt_install libc6-dbg
             # Use snap to install the latest Valgrind