Update changelog

CHANGELOG.md

@@ -10,6 +10,8 @@ Note: In this file, do not use the hard wrap in the middle of a sentence for com
 
 ## [Unreleased]
 
+- Support more host architectures. ([#1841](https://github.com/taiki-e/install-action/pull/1841), thanks @Gelbpunkt)
+
 ## [2.78.3] - 2026-05-17
 
 - Update `zizmor@latest` to 1.25.2.

main.sh

@@ -580,7 +580,8 @@ case "${RUNNER_OS}" in
 esac
 case "${RUNNER_ARCH}" in
   X64) host_arch=x86_64 ;;
-  # Ignore 32-bit Arm for now, as we need to consider the version and whether hard-float is supported.
+  # Always fallback to `cargo install` on 32-bit Arm for now, as we need to
+  # consider the version and whether hard-float is supported.
   # https://github.com/rust-lang/rustup/pull/593
   # https://github.com/cross-rs/cross/pull/1018
   # And support for 32-bit Arm will be removed in near future.
@@ -588,23 +589,22 @@ case "${RUNNER_ARCH}" in
   # Does it seem only armv7l+ is supported?
   # https://github.com/actions/runner/blob/v2.321.0/src/Misc/externals.sh#L178
   # https://github.com/actions/runner/issues/688
-  ARM) bail "32-bit Arm runner is currently not supported; if you need support for this platform, please submit an issue at <https://github.com/taiki-e/install-action>" ;;
+  ARM) host_arch=arm ;;
-  X86) bail "32-bit x86 runner is currently not supported; if you need support for this platform, please submit an issue at <https://github.com/taiki-e/install-action>" ;;
+  X86) host_arch=x86 ;;
   ARM64) host_arch=aarch64 ;;
   PPC64LE) host_arch=powerpc64le ;;
   RISCV64) host_arch=riscv64 ;;
   S390X) host_arch=s390x ;;
   *)
     info "unrecognized runner.arch '${RUNNER_ARCH}'; fallback to uname -m"
-    case "$(uname -m)" in
+    host_arch="$(uname -m)"
+    case "${host_arch}" in
       aarch64 | arm64) host_arch=aarch64 ;;
-      xscale | arm | armv*l) bail "32-bit Arm runner is currently not supported; if you need support for this platform, please submit an issue at <https://github.com/taiki-e/install-action>" ;;
       ppc64le) host_arch=powerpc64le ;;
       riscv64) host_arch=riscv64 ;;
       s390x) host_arch=s390x ;;
-      # Very few tools provide prebuilt binaries for these.
+      # On these platforms, we just use the result of `uname -m` as host_arch, and always fallback to `cargo install`.
-      # TODO: fallback to `cargo install`? (binstall fallback is not good idea here as cargo-binstall doesn't provide prebuilt binaries for these.)
+      xscale | arm | armv*l | loongarch64 | mips | mips64 | ppc | ppc64 | sun4v) ;;
-      loongarch64 | mips | mips64 | ppc | ppc64 | sun4v) bail "$(uname -m) runner is not supported yet; please submit an issue at <https://github.com/taiki-e/install-action>" ;;
       # GitHub Actions Runner supports x86_64/AArch64/Arm Linux and x86_64/AArch64 Windows/macOS.
       # https://github.com/actions/runner/blob/v2.332.0/.github/workflows/build.yml#L24
       # https://docs.github.com/en/actions/reference/runners/self-hosted-runners#supported-processor-architectures