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# -*- Python -*-
"""Repository rule for system library autoconfiguration.
`syslibs_configure` depends on the following environment variables:
* `TF_SYSTEM_LIBS`: list of third party dependencies that should use
the system version instead
"""
_TF_SYSTEM_LIBS = "TF_SYSTEM_LIBS"
VALID_LIBS = [
"astor_archive",
"com_googlesource_code_re2",
"curl",
"cython",
"double_conversion",
"flatbuffers",
"gif_archive",
"grpc",
"jemalloc",
"jpeg",
"jsoncpp_git",
"lmdb",
"nasm",
"nsync",
"org_sqlite",
"pcre",
"png_archive",
"six_archive",
"snappy",
"swig",
"termcolor_archive",
"zlib_archive",
]
def auto_configure_fail(msg):
"""Output failure message when syslibs configuration fails."""
red = "\033[0;31m"
no_color = "\033[0m"
fail("\n%sSystem Library Configuration Error:%s %s\n" % (red, no_color, msg))
def _is_windows(repository_ctx):
"""Returns true if the host operating system is windows."""
os_name = repository_ctx.os.name.lower()
if os_name.find("windows") != -1:
return True
return False
def _enable_syslibs(repository_ctx):
s = repository_ctx.os.environ.get(_TF_SYSTEM_LIBS, "").strip()
if not _is_windows(repository_ctx) and s != None and s != "":
return True
return False
def _get_system_lib_list(repository_ctx):
"""Gets the list of deps that should use the system lib.
Args:
repository_ctx: The repository context.
Returns:
A string version of a python list
"""
if _TF_SYSTEM_LIBS not in repository_ctx.os.environ:
return []
libenv = repository_ctx.os.environ[_TF_SYSTEM_LIBS].strip()
libs = []
for lib in list(libenv.split(",")):
lib = lib.strip()
if lib == "":
continue
if lib not in VALID_LIBS:
auto_configure_fail("Invalid system lib set: %s" % lib)
return []
libs.append(lib)
return libs
def _format_system_lib_list(repository_ctx):
"""Formats the list of deps that should use the system lib.
Args:
repository_ctx: The repository context.
Returns:
A list of the names of deps that should use the system lib.
"""
libs = _get_system_lib_list(repository_ctx)
ret = ""
for lib in libs:
ret += "'%s',\n" % lib
return ret
def _tpl(repository_ctx, tpl, substitutions = {}, out = None):
if not out:
out = tpl.replace(":", "")
repository_ctx.template(
out,
Label("//third_party/systemlibs%s.tpl" % tpl),
substitutions,
False,
)
def _create_dummy_repository(repository_ctx):
"""Creates the dummy repository to build with all bundled libraries."""
_tpl(repository_ctx, ":BUILD")
_tpl(
repository_ctx,
":build_defs.bzl",
{
"%{syslibs_enabled}": "False",
"%{syslibs_list}": "",
},
)
def _create_local_repository(repository_ctx):
"""Creates the repository to build with system libraries."""
_tpl(repository_ctx, ":BUILD")
_tpl(
repository_ctx,
":build_defs.bzl",
{
"%{syslibs_enabled}": "True",
"%{syslibs_list}": _format_system_lib_list(repository_ctx),
},
)
def _syslibs_autoconf_impl(repository_ctx):
"""Implementation of the syslibs_configure repository rule."""
if not _enable_syslibs(repository_ctx):
_create_dummy_repository(repository_ctx)
else:
_create_local_repository(repository_ctx)
syslibs_configure = repository_rule(
implementation = _syslibs_autoconf_impl,
environ = [
_TF_SYSTEM_LIBS,
],
)
"""Configures the build to link to system libraries
instead of using bundled versions.
Add the following to your WORKSPACE FILE:
```python
syslibs_configure(name = "local_config_syslibs")
```
Args:
name: A unique name for this workspace rule.
"""
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