musl compability + alpine dockerfile (#1115)

Author: carlhoerberg

packaging/alpine/Dockerfile

@@ -0,0 +1,21 @@
+FROM 84codes/crystal:latest-alpine AS builder
+RUN apk add lz4-dev
+WORKDIR /tmp
+COPY shard.yml shard.lock .
+RUN shards install --production
+COPY ./static ./static
+COPY ./views ./views
+COPY ./src ./src
+COPY Makefile .
+ARG MAKEFLAGS=-j2
+RUN make all
+
+FROM alpine:latest
+RUN apk add openssl lz4-libs pcre2 libgcc
+COPY --from=builder /tmp/bin/* /usr/bin/
+EXPOSE 5672 15672
+VOLUME /var/lib/lavinmq
+WORKDIR /var/lib/lavinmq
+ENV GC_UNMAP_THRESHOLD=1
+HEALTHCHECK CMD ["/usr/bin/lavinmqctl", "status"]
+ENTRYPOINT ["/usr/bin/lavinmq", "-b", "0.0.0.0", "--guest-only-loopback=false"]

src/stdlib/filesystem.cr

@@ -17,7 +17,11 @@ lib LibC
       spare : StaticArray(Long, 4)
     end
 
-    fun statfs64(file : Char*, buf : Statfs*) : Int
+    {% if flag?(:musl) %}
+      fun statfs(file : Char*, buf : Statfs*) : Int
+    {% else %}
+      fun statfs64(file : Char*, buf : Statfs*) : Int
+    {% end %}
   {% elsif flag?(:darwin) %}
     struct Statfs
       bsize : UInt32
@@ -85,7 +89,7 @@ struct FilesystemInfo
   getter total : UInt64
 end
 
-{% if flag?(:linux) || flag?(:darwin) %}
+{% if (flag?(:linux) && !flag?(:musl)) || flag?(:darwin) %}
   module Filesystem
     def self.info(path)
       statfs = uninitialized LibC::Statfs
@@ -95,7 +99,7 @@ end
       FilesystemInfo.new(statfs)
     end
   end
-{% elsif flag?(:freebsd) %}
+{% elsif flag?(:freebsd) || flag?(:musl) %}
   module Filesystem
     def self.info(path)
       statfs = uninitialized LibC::Statfs