add docker for building qemu 5.0.0-rc1 on alpine

 * cherry-picked patches from apline apk community/qemu:

   - 0006-linux-user-signal.c-define-__SIGRTMIN-MAX-for-non-GN.patch
   - fix-sigevent-and-sigval_t.patch
   - musl-F_SHLCK-and-F_EXLCK.patch

Author: mikdusan

.dockerignore

@@ -0,0 +1 @@
+.git

Dockerfile

@@ -0,0 +1,43 @@
+FROM alpine:3.11.5
+
+RUN apk update
+RUN apk upgrade
+
+# required by qemu
+RUN apk add\
+ make\
+ python3\
+ gcc\
+ libc-dev\
+ pkgconf\
+ linux-headers\
+ glib-dev glib-static\
+ zlib-dev zlib-static
+
+# additional
+RUN apk add bash xz
+
+WORKDIR /work
+
+COPY command/base command/base
+COPY command/fetch command/fetch
+RUN /work/command/fetch
+
+COPY command/extract command/extract
+RUN /work/command/extract
+
+COPY patch patch
+COPY command/patch command/patch
+RUN /work/command/patch
+
+COPY command/configure command/configure
+RUN /work/command/configure
+
+COPY command/make command/make
+RUN /work/command/make
+
+COPY command/install command/install
+RUN /work/command/install
+
+COPY command/package command/package
+RUN /work/command/package

README.md

@@ -0,0 +1,25 @@
+# qemu-static
+
+The purpose of this project is to build a highly compatible QEMU binary package
+for linux. The overall strategy is to use Alpine Linux and link statically to
+all possible libraries.
+
+## build docker image
+```
+docker build --tag qemu-static:5.0.0-rc1 .
+```
+
+## run container, save ID, copy artifact(s)
+```
+docker run -it --cidfile=qemu.cid qemu-static:5.0.0-rc1 true
+docker cp "$(cat qemu.cid):work/artifact" artifact
+```
+
+## review final artifact(s)
+```
+ls -al artifact/
+total 28100
+drwxr-xr-x 2 nobody users     4096 Apr 11 07:42 .
+drwxr-xr-x 6 nobody users     4096 Apr 11 08:02 ..
+-rw-r--r-- 1 nobody users 28762792 Apr 11 07:43 qemu-linux-x86_64-5.0.0-rc1.tar.xz
+```

command/base

@@ -0,0 +1,25 @@
+WORK_ROOT=$(pwd)
+
+HOST_OS_RAW=$(uname -s)
+HOST_ARCH_RAW=$(uname -m)
+
+HOST_OS=${HOST_OS_RAW,,}
+HOST_ARCH=${HOST_ARCH_RAW,,}
+
+QEMU_NAME="qemu"
+QEMU_REV="5.0.0-rc1"
+QEMU_SRC_BASENAME="${QEMU_NAME}-${QEMU_REV}"
+QEMU_SRC_URL="https://download.qemu.org/${QEMU_SRC_BASENAME}.tar.xz"
+QEMU_SRC_PREFIX="${QEMU_REV}"
+QEMU_ARTIFACT_BASENAME="${QEMU_NAME}-${HOST_OS}-${HOST_ARCH}-${QEMU_REV}"
+
+WORKDIR() {
+    mkdir -p $1
+    cd $1
+    echo "workdir: $(pwd)"
+}
+
+RUN() {
+    echo "run: $@"
+    "$@"
+}

command/configure

@@ -0,0 +1,14 @@
+#!/bin/bash
+
+set -e
+
+. $(dirname $0)/base
+
+WORKDIR "/work/out/${QEMU_SRC_BASENAME}"
+RUN "/work/src/${QEMU_SRC_BASENAME}/configure" \
+    --prefix="/work/dst/${QEMU_ARTIFACT_BASENAME}" \
+    --disable-debug-info \
+    --disable-system \
+    --disable-werror \
+    --enable-linux-user \
+    --static

command/extract

@@ -0,0 +1,8 @@
+#!/bin/bash
+
+set -e
+
+. $(dirname $0)/base
+
+WORKDIR /work/src
+RUN tar xf "$(basename ${QEMU_SRC_URL})"

command/fetch

@@ -0,0 +1,8 @@
+#!/bin/bash
+
+set -e
+
+. $(dirname $0)/base
+
+WORKDIR /work/src
+RUN wget "${QEMU_SRC_URL}"

command/install

@@ -0,0 +1,8 @@
+#!/bin/bash
+
+set -e
+
+. $(dirname $0)/base
+
+WORKDIR "/work/out/${QEMU_SRC_BASENAME}"
+RUN make -j$(nproc) install

command/make

@@ -0,0 +1,8 @@
+#!/bin/bash
+
+set -e
+
+. $(dirname $0)/base
+
+WORKDIR "/work/out/${QEMU_SRC_BASENAME}"
+RUN make -j$(nproc)

command/package

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+set -e
+
+. $(dirname $0)/base
+
+
+WORKDIR /work/artifact
+RUN tar cJf "${QEMU_ARTIFACT_BASENAME}.tar.xz" -C /work/dst "${QEMU_ARTIFACT_BASENAME}"

command/patch

@@ -0,0 +1,8 @@
+#!/bin/bash
+
+set -e
+
+. $(dirname $0)/base
+
+WORKDIR "/work/src/${QEMU_SRC_BASENAME}"
+RUN patch -p1 -i "${WORK_ROOT}/patch/${QEMU_NAME}.diff"

patch/qemu.diff

@@ -0,0 +1,58 @@
+diff --git a/linux-user/signal.c b/linux-user/signal.c
+index 8cf51ffe..a006f7b0 100644
+--- a/linux-user/signal.c
++++ b/linux-user/signal.c
+@@ -25,6 +25,13 @@
+ #include "trace.h"
+ #include "signal-common.h"
+ 
++#ifndef __SIGRTMIN
++#define __SIGRTMIN 32
++#endif
++#ifndef __SIGRTMAX
++#define __SIGRTMAX (NSIG-1)
++#endif
++
+ static struct target_sigaction sigact_table[TARGET_NSIG];
+ 
+ static void host_signal_handler(int host_signum, siginfo_t *info,
+diff --git a/linux-user/syscall.c b/linux-user/syscall.c
+index 6495ddc4..debb6f33 100644
+--- a/linux-user/syscall.c
++++ b/linux-user/syscall.c
+@@ -123,6 +123,13 @@
+ #include "fd-trans.h"
+ #include "tcg/tcg.h"
+ 
++#ifndef F_SHLCK
++#define F_SHLCK 8
++#endif
++#ifndef F_EXLCK
++#define F_EXLCK 4
++#endif
++
+ #ifndef CLONE_IO
+ #define CLONE_IO                0x80000000      /* Clone io context */
+ #endif
+@@ -6771,9 +6778,20 @@ static inline abi_long host_to_target_timex(abi_long target_addr,
+ }
+ #endif
+ 
+-static inline abi_long target_to_host_sigevent(struct sigevent *host_sevp,
++struct host_sigevent {
++    union sigval sigev_value;
++    int sigev_signo;
++    int sigev_notify;
++    union {
++       int _pad[64-sizeof(int) * 2 + sizeof(union sigval)];
++       int _tid;
++    } _sigev_un;
++};
++
++static inline abi_long target_to_host_sigevent(struct sigevent *sevp,
+                                                abi_ulong target_addr)
+ {
++    struct host_sigevent *host_sevp = (struct host_sigevent *) sevp;
+     struct target_sigevent *target_sevp;
+ 
+     if (!lock_user_struct(VERIFY_READ, target_sevp, target_addr, 1)) {