[Libguestfs] [PATCH nbdkit UNFINISHED] Add the ability to write plugins in golang.

Similar to C, OCaml and Rust, this is not a plugin per se. Instead it's more of a method and set of tests around writing plugins in golang. They are standalone programs that compile into shared objects that nbdkit can then load (so there is no "go plugin" between nbdkit and the user plugin, unlike in scripting languages like Perl). --- plugins/golang/nbdkit-golang-plugin.pod | 34 ++++++++ configure.ac | 32 +++++++ plugins/golang/Makefile.am | 75 ++++++++++++++++ plugins/golang/test/wrappers.h | 40 +++++++++ plugins/golang/config-test.go | 38 +++++++++ .../src/libguestfs.org/nbdkit/nbdkit.go | 57 +++++++++++++ plugins/golang/test/init.go | 67 +++++++++++++++ plugins/golang/test/run-test.sh | 41 +++++++++ plugins/golang/test/test.go | 82 ++++++++++++++++++ plugins/golang/test/wrappers.go | 85 +++++++++++++++++++ .gitignore | 2 + README | 4 + 12 files changed, 557 insertions(+) diff --git a/plugins/golang/nbdkit-golang-plugin.pod b/plugins/golang/nbdkit-golang-plugin.pod new file mode 100644 index 00000000..b449a830 --- /dev/null +++ b/plugins/golang/nbdkit-golang-plugin.pod @@ -0,0 +1,34 @@ +=head1 NAME + +nbdkit-golang-plugin - writing nbdkit plugins in Go + +=head1 SYNOPSIS + + nbdkit /path/to/plugin.so [arguments...] + +=head1 DESCRIPTION + +This manual page describes how to write nbdkit plugins in compiled +Golang code. Go plugins are compiled to F<*.so> files (the same as +plugins written in C) and are used in the same way. + +XXX MORE DOCS + + + +=head1 VERSION + +Golang plugins first appeared in nbdkit 1.20. + +=head1 SEE ALSO + +L<nbdkit(1)>, +L<nbdkit-plugin(3)>. + +=head1 AUTHORS + +Richard W.M. Jones + +=head1 COPYRIGHT + +Copyright (C) 2020 Red Hat Inc. diff --git a/configure.ac b/configure.ac index c5db962c..4b1c4cd6 100644 --- a/configure.ac +++ b/configure.ac @@ -49,6 +49,7 @@ LT_INIT dnl List of plugins and filters. lang_plugins="\ + golang \ lua \ ocaml \ perl \ @@ -754,6 +755,34 @@ AS_IF([test "x$enable_lua" != "xno"],[ ]) AM_CONDITIONAL([HAVE_LUA],[test "x$enable_lua" = "xyes"]) +dnl Check for golang. +AC_ARG_ENABLE([golang], + AS_HELP_STRING([--disable-golang], [disable Go language plugin]), + [], + [enable_golang=yes]) +AS_IF([test "x$enable_golang" != "xno"],[ + AC_CHECK_PROG([GOLANG],[go],[go],[no]) + AS_IF([test "x$GOLANG" != "xno"],[ + AC_MSG_CHECKING([if $GOLANG is usable]) + AS_IF([$GOLANG run $srcdir/plugins/golang/config-test.go 2>&AS_MESSAGE_LOG_FD],[ + AC_MSG_RESULT([yes]) + + # Substitute some golang environment. + GOOS=`$GOLANG env GOOS` + GOARCH=`$GOLANG env GOARCH` + GOROOT=`$GOLANG env GOROOT` + AC_SUBST([GOOS]) + AC_SUBST([GOARCH]) + AC_SUBST([GOROOT]) + ],[ + AC_MSG_RESULT([no]) + AC_MSG_WARN([golang ($GOLANG) is installed but not usable]) + GOLANG=no + ]) + ]) +],[GOLANG=no]) +AM_CONDITIONAL([HAVE_GOLANG],[test "x$GOLANG" != "xno"]) + dnl Check for curl (only if you want to compile the curl plugin). AC_ARG_WITH([curl], [AS_HELP_STRING([--without-curl], @@ -1002,6 +1031,7 @@ AC_CONFIG_FILES([Makefile plugins/file/Makefile plugins/floppy/Makefile plugins/full/Makefile + plugins/golang/Makefile plugins/guestfs/Makefile plugins/gzip/Makefile plugins/info/Makefile @@ -1125,6 +1155,8 @@ feature "vddk ................................... " \ echo echo "Languages:" echo +feature "go ..................................... " \ + test "x$HAVE_GOLANG_TRUE" = "x" feature "lua .................................... " \ test "x$HAVE_LUA_TRUE" = "x" feature "ocaml .................................. " \ diff --git a/plugins/golang/Makefile.am b/plugins/golang/Makefile.am new file mode 100644 index 00000000..961495f8 --- /dev/null +++ b/plugins/golang/Makefile.am @@ -0,0 +1,75 @@ +# nbdkit +# Copyright (C) 2020 Red Hat Inc. +# +# Redistribution and use in source and binary forms, with or without +# modification, are permitted provided that the following conditions are +# met: +# +# * Redistributions of source code must retain the above copyright +# notice, this list of conditions and the following disclaimer. +# +# * Redistributions in binary form must reproduce the above copyright +# notice, this list of conditions and the following disclaimer in the +# documentation and/or other materials provided with the distribution. +# +# * Neither the name of Red Hat nor the names of its contributors may be +# used to endorse or promote products derived from this software without +# specific prior written permission. +# +# THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND +# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, +# THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A +# PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR +# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF +# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND +# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, +# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT +# OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF +# SUCH DAMAGE. + +include $(top_srcdir)/common-rules.mk + +EXTRA_DIST = \ + nbdkit-golang-plugin.pod \ + src/libguestfs.org/nbdkit/nbdkit.go \ + test/init.go \ + test/run-test.sh \ + test/test.go \ + test/wrappers.go \ + test/wrappers.h \ + $(NULL) + +if HAVE_GOLANG + +# There is nothing to build. Everything is statically compiled and +# linked together when we compile the test. + +TESTS = test/run-test.sh +check_DATA = test/nbdkit-gotest-plugin.so + +test/nbdkit-gotest-plugin.so: src/libguestfs.org/nbdkit/nbdkit.go test/init.go test/test.go test/wrappers.go test/wrappers.h + cd test && \ + GOPATH="$(abs_builddir)" \ + $(GOLANG) build \ + -o nbdkit-gotest-plugin.so -buildmode=c-shared + +CLEANFILES += \ + test/nbdkit-gotest-plugin.so \ + test/nbdkit-gotest-plugin.h \ + $(NULL) + +if HAVE_POD + +man_MANS = nbdkit-golang-plugin.3 +CLEANFILES += $(man_MANS) + +nbdkit-golang-plugin.3: nbdkit-golang-plugin.pod + $(PODWRAPPER) --section=3 --man $@ \ + --html $(top_builddir)/html/$@.html \ + $< + +endif HAVE_POD + +endif HAVE_GOLANG diff --git a/plugins/golang/test/wrappers.h b/plugins/golang/test/wrappers.h new file mode 100644 index 00000000..ea654631 --- /dev/null +++ b/plugins/golang/test/wrappers.h @@ -0,0 +1,40 @@ +/* Go wrappers + * Copyright (C) 2013-2020 Red Hat Inc. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * * Neither the name of Red Hat nor the names of its contributors may be + * used to endorse or promote products derived from this software without + * specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, + * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A + * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF + * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +extern void *open_wrapper (int readonly); +extern void close_wrapper (void *handle); +extern int64_t get_size_wrapper (void *handle); +extern int pread_wrapper (void *handle, void *buf, + uint32_t count, uint64_t offset, uint32_t flags); +extern int pwrite_wrapper (void *handle, const void *buf, + uint32_t count, uint64_t offset, uint32_t flags); +// XXX ALL WRAPPERS diff --git a/plugins/golang/config-test.go b/plugins/golang/config-test.go new file mode 100644 index 00000000..0f5cfe6b --- /dev/null +++ b/plugins/golang/config-test.go @@ -0,0 +1,38 @@ +/* Go configuration test + * Copyright (C) 2013-2020 Red Hat Inc. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * * Neither the name of Red Hat nor the names of its contributors may be + * used to endorse or promote products derived from this software without + * specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, + * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A + * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF + * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +/* Used by ./configure to check golang is functional. */ + +package main + +func main() { +} diff --git a/plugins/golang/src/libguestfs.org/nbdkit/nbdkit.go b/plugins/golang/src/libguestfs.org/nbdkit/nbdkit.go new file mode 100644 index 00000000..c21eabb3 --- /dev/null +++ b/plugins/golang/src/libguestfs.org/nbdkit/nbdkit.go @@ -0,0 +1,57 @@ +/* Go helper functions. + * Copyright (C) 2013-2020 Red Hat Inc. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * * Neither the name of Red Hat nor the names of its contributors may be + * used to endorse or promote products derived from this software without + * specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, + * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A + * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF + * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +package nbdkit + +/* +#cgo pkg-config: nbdkit +#cgo LDFLAGS: -Wl,--unresolved-symbols=ignore-in-object-files + +#include <stdio.h> +#include <stdlib.h> + +#define NBDKIT_API_VERSION 2 +#include <nbdkit-plugin.h> + +// cgo cannot call varargs functions. +void +_nbdkit_debug (const char *s) +{ + nbdkit_debug ("%s", s); +} + +*/ +import "C" + +func Debug(s string) { + C._nbdkit_debug(C.CString(s)) +} diff --git a/plugins/golang/test/init.go b/plugins/golang/test/init.go new file mode 100644 index 00000000..bfb02f62 --- /dev/null +++ b/plugins/golang/test/init.go @@ -0,0 +1,67 @@ +/* Initialize the plugin. + * Copyright (C) 2013-2020 Red Hat Inc. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * * Neither the name of Red Hat nor the names of its contributors may be + * used to endorse or promote products derived from this software without + * specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, + * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A + * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF + * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +package main + +/* +#cgo pkg-config: nbdkit + +#include <stdio.h> +#include <stdlib.h> + +#define NBDKIT_API_VERSION 2 +#include <nbdkit-plugin.h> +*/ +import "C" +import "unsafe" + +var plugin C.struct_nbdkit_plugin + +//export plugin_init +func plugin_init() *C.struct_nbdkit_plugin { + // Initialization is asynchronous, but need it to happen + // synchronously, so we need to provide a function that the + // user code can call to set plugin fields. + init_plugin() + + // Set up the hidden plugin fields as for C. + struct_size := C.ulong(unsafe.Sizeof(plugin)) + plugin._struct_size = struct_size + plugin._api_version = C.NBDKIT_API_VERSION + plugin._thread_model = C.NBDKIT_THREAD_MODEL_PARALLEL + p := (*C.struct_nbdkit_plugin)(C.malloc(struct_size)) + *p = plugin + return p +} + +// This must exist, but it is never called. +func main() {} diff --git a/plugins/golang/test/run-test.sh b/plugins/golang/test/run-test.sh new file mode 100755 index 00000000..5c10f1b7 --- /dev/null +++ b/plugins/golang/test/run-test.sh @@ -0,0 +1,41 @@ +#!/usr/bin/env bash +# nbdkit +# Copyright (C) 2020 Red Hat Inc. +# +# Redistribution and use in source and binary forms, with or without +# modification, are permitted provided that the following conditions are +# met: +# +# * Redistributions of source code must retain the above copyright +# notice, this list of conditions and the following disclaimer. +# +# * Redistributions in binary form must reproduce the above copyright +# notice, this list of conditions and the following disclaimer in the +# documentation and/or other materials provided with the distribution. +# +# * Neither the name of Red Hat nor the names of its contributors may be +# used to endorse or promote products derived from this software without +# specific prior written permission. +# +# THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND +# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, +# THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A +# PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR +# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF +# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND +# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, +# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT +# OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF +# SUCH DAMAGE. + +set -e +set -x + +if ! qemu-img --version; then + echo "qemu-img is required to run this test" + exit 1 +fi + +../../nbdkit -f -v test/nbdkit-gotest-plugin.so --run 'qemu-img info $nbd' diff --git a/plugins/golang/test/test.go b/plugins/golang/test/test.go new file mode 100644 index 00000000..c9544abc --- /dev/null +++ b/plugins/golang/test/test.go @@ -0,0 +1,82 @@ +/* Test plugin. + * Copyright (C) 2013-2020 Red Hat Inc. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * * Neither the name of Red Hat nor the names of its contributors may be + * used to endorse or promote products derived from this software without + * specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, + * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A + * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF + * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +package main + +/* +#cgo pkg-config: nbdkit + +#include <stdio.h> +#include <stdlib.h> + +#define NBDKIT_API_VERSION 2 +#include <nbdkit-plugin.h> +#include "wrappers.h" +*/ +import "C" +import "unsafe" +import "libguestfs.org/nbdkit" + +//export pluginOpen +func pluginOpen(readonly C.int) unsafe.Pointer { + nbdkit.Debug("golang code running in the .open callback") + // Cannot return a golang pointer, need to allocate a C obj. + return unsafe.Pointer(C.CString("hello")) +} + +//export pluginClose +func pluginClose(handle unsafe.Pointer) { + nbdkit.Debug("golang code running in the .close callback") + C.free(handle) +} + +//export pluginGetSize +func pluginGetSize(handle unsafe.Pointer) C.int64_t { + nbdkit.Debug("golang code running in the .get_size callback") + return 1024 * 1024 +} + +//export pluginPRead +func pluginPRead(handle unsafe.Pointer, buf []byte, count C.uint32_t, + offset C.uint64_t, flags C.uint32_t) C.int { + nbdkit.Debug("golang code running in the .pread callback") + // XXX + return 0 +} + +func init_plugin() { + plugin.name = C.CString("test") + plugin.open = (*[0]byte)(C.open_wrapper) + plugin.close = (*[0]byte)(C.close_wrapper) + plugin.get_size = (*[0]byte)(C.get_size_wrapper) + plugin.pread = (*[0]byte)(C.pread_wrapper) +} diff --git a/plugins/golang/test/wrappers.go b/plugins/golang/test/wrappers.go new file mode 100644 index 00000000..e7e0d3a9 --- /dev/null +++ b/plugins/golang/test/wrappers.go @@ -0,0 +1,85 @@ +/* Go wrappers + * Copyright (C) 2013-2020 Red Hat Inc. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * * Neither the name of Red Hat nor the names of its contributors may be + * used to endorse or promote products derived from this software without + * specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, + * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A + * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF + * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +package main + +/* +#cgo pkg-config: nbdkit + +#include <stdio.h> +#include <stdlib.h> + +#define NBDKIT_API_VERSION 2 +#include <nbdkit-plugin.h> +#include "wrappers.h" + +extern void *pluginOpen (); +void * +open_wrapper (int readonly) +{ + return pluginOpen (readonly); +} + +extern void pluginClose (); +void +close_wrapper (void *handle) +{ + pluginClose (handle); +} + +extern int64_t pluginGetSize (); +int64_t +get_size_wrapper (void *handle) +{ + return pluginGetSize (handle); +} + +extern int pluginPRead (); +int +pread_wrapper (void *handle, void *buf, uint32_t count, uint64_t offset, + uint32_t flags) +{ + return pluginPRead (handle, buf, count, offset, flags); +} + +//extern int pluginPWrite (); +//int +//pwrite_wrapper (void *handle, const void *buf, uint32_t count, uint64_t offset, +// uint32_t flags) +//{ +// return pluginPWrite (handle, buf, count, offset, flags); +//} + +// XXX ALL WRAPPERS + +*/ +import "C" diff --git a/.gitignore b/.gitignore index c44fb40d..7e71df35 100644 --- a/.gitignore +++ b/.gitignore @@ -71,6 +71,8 @@ plugins/*/*.3 /plugins/example4/nbdkit-example4-plugin /plugins/eval/call.c /plugins/eval/methods.c +/plugins/golang/test/nbdkit-gotest-plugin.h +/plugins/golang/test/nbdkit-gotest-plugin.so /plugins/ocaml/nbdkit-ocamlexample-plugin.so /plugins/rust/Cargo.lock /plugins/rust/Cargo.toml diff --git a/README b/README index 05f1e060..1e05846d 100644 --- a/README +++ b/README @@ -148,6 +148,10 @@ For the Rust plugin: - cargo (other dependencies will be downloaded at build time) +To be able to write plugins in golang: + + - go >= 1.5 + For bash tab completion: - bash-completion >= 1.99 -- 2.25.0