From c0006e254b350ecca3dc60dcc8069661b0fe614a Mon Sep 17 00:00:00 2001
From: Steffen Deusch <steffen@deusch.me>
Date: Fri, 28 Feb 2025 10:26:25 +0100
Subject: [PATCH] Support Linux MUSL v3 and v4

---
 CHANGELOG.md    | 11 ++++++-----
 README.md       |  9 ++-------
 lib/tailwind.ex | 31 ++++++++++++++++++++++---------
 3 files changed, 30 insertions(+), 21 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index e048849..8f128d5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,13 +1,14 @@
 # CHANGELOG
 
+## v0.3.1
+
+* Support correct target for Linux MUSL with Tailwind v3.
+
 ## v0.3.0 (2025-02-26)
 
-Support Tailwind v4+. This release drops official support for Tailwind v3.
-If you want to continue using Tailwind v3, please pin the `tailwind` dependency to a 0.2 version:
+* Support Tailwind v4+. This release assumes Tailwind v4 for new projects.
 
-```elixir
-{:tailwind, "~> 0.2.0", only: :dev}`
-```
+Note: v0.3.0 dropped target code for handling Linux MUSL with Tailwind v3. Use v0.3.1+ instead.
 
 ## v0.2.4 (2024-10-18)
 
diff --git a/README.md b/README.md
index 3af3ca4..e14efdc 100644
--- a/README.md
+++ b/README.md
@@ -42,13 +42,8 @@ Tailwind version of choice:
 config :tailwind, version: "4.0.9"
 ```
 
-Note that `:tailwind` 0.3+ supports Tailwind v4+. If you need to use Tailwind v3, use
-
-```
-{:tailwind, "~> 0.2.0", only: :dev}
-```
-
-instead, and refer to [the README in the 0.2 branch](https://github.com/phoenixframework/tailwind/blob/v0.2/README.md).
+Note that `:tailwind` 0.3+ assumes Tailwind v4+ by default. It still supports Tailwind v3, but some configuration options when setting up a new
+project might be different. If you use Tailwind v3, also have a look at [the README in the 0.2 branch](https://github.com/phoenixframework/tailwind/blob/v0.2/README.md). 
 
 Now you can install Tailwind by running:
 
diff --git a/lib/tailwind.ex b/lib/tailwind.ex
index 3d5503d..63b3115 100644
--- a/lib/tailwind.ex
+++ b/lib/tailwind.ex
@@ -282,23 +282,36 @@ defmodule Tailwind do
       {{:unix, :freebsd}, arch, _abi, 64} when arch in ~w(x86_64 amd64) ->
         "freebsd-x64"
 
-      {{:unix, :linux}, "aarch64", "musl", 64} ->
-        "linux-arm64-musl"
+      {{:unix, :linux}, "aarch64", abi, 64} ->
+        "linux-arm64" <> maybe_add_abi_suffix(abi)
 
-      {{:unix, :linux}, "aarch64", _abi, 64} ->
-        "linux-arm64"
+      {{:unix, :linux}, "arm", _abi, 32} ->
+        "linux-armv7"
 
-      {{:unix, _osname}, arch, "musl", 64} when arch in ~w(x86_64 amd64) ->
-        "linux-x64-musl"
+      {{:unix, :linux}, "armv7" <> _, _abi, 32} ->
+        "linux-armv7"
 
-      {{:unix, _osname}, arch, _abi, 64} when arch in ~w(x86_64 amd64) ->
-        "linux-x64"
+      {{:unix, _osname}, arch, abi, 64} when arch in ~w(x86_64 amd64) ->
+        "linux-x64" <> maybe_add_abi_suffix(abi)
 
       {_os, _arch, _abi, _wordsize} ->
         raise "tailwind is not available for architecture: #{arch_str}"
     end
   end
 
+  defp maybe_add_abi_suffix("musl") do
+    # Tailwind CLI v4+ added explicit musl versions for Linux as
+    # tailwind-linux-x64-musl
+    # tailwind-linux-arm64-musl
+    if Version.match?(configured_version(), "~> 4.0") do
+      "-musl"
+    else
+      ""
+    end
+  end
+
+  defp maybe_add_abi_suffix(_), do: ""
+
   defp fetch_body!(url, retry \\ true) when is_binary(url) do
     scheme = URI.parse(url).scheme
     url = String.to_charlist(url)
@@ -339,7 +352,7 @@ defmodule Tailwind do
         The tailwind binary couldn't be found at: #{url}
 
         This could mean that you're trying to install a version that does not support the detected
-        target architecture.
+        target architecture. For example, Tailwind v4+ dropped support for 32-bit ARM.
 
         You can see the available files for the configured version at: