import sys

import pathlib

import subprocess

import os

sources = [pathlib.Path(arg).resolve() for arg in sys.argv[1:]]

source_dir = pathlib.Path(os.path.commonpath(src.parent for src in sources))

for src in sources:

with open(src, 'rb') as input:

lfs_pointer = subprocess.run(["git", "lfs", "clean", "--", src],

stdin=input, stdout=subprocess.PIPE, check=True, cwd=source_dir).stdout

with open(src.name, 'wb') as output:

subprocess.run(["git", "lfs", "smudge", "--", src], input=lfs_pointer, stdout=output, check=True, cwd=source_dir)

def _smudge(repository_ctx, srcs):

for src in srcs:

repository_ctx.watch(src)

script = Label("//misc/bazel/internal:git_lfs_smudge.py")

python = repository_ctx.which("python3") or repository_ctx.which("python")

if not python:

fail("Neither python3 nor python executables found")

res = repository_ctx.execute([python, script] + srcs, quiet = False)

if res.return_code != 0:

fail("git LFS smudging failed while instantiating @%s" % repository_ctx.name)

def _download_and_extract_lfs(repository_ctx):

attr = repository_ctx.attr

src = repository_ctx.path(attr.src)

if attr.build_file_content and attr.build_file:

fail("You should specify only one among build_file_content and build_file for rule @%s" % repository_ctx.name)

_smudge(repository_ctx, [src])

repository_ctx.extract(src.basename, stripPrefix = attr.strip_prefix)

repository_ctx.delete(src.basename)

if attr.build_file_content:

repository_ctx.file("BUILD.bazel", attr.build_file_content)

elif attr.build_file:

repository_ctx.symlink(attr.build_file, "BUILD.bazel")

def _download_lfs(repository_ctx):

attr = repository_ctx.attr

if int(bool(attr.srcs)) + int(bool(attr.dir)) != 1:

fail("Exactly one between `srcs` and `dir` must be defined for @%s" % repository_ctx.name)

if attr.srcs:

srcs = [repository_ctx.path(src) for src in attr.srcs]

else:

dir = repository_ctx.path(attr.dir)

if not dir.is_dir:

fail("`dir` not a directory in @%s" % repository_ctx.name)

srcs = [f for f in dir.readdir() if not f.is_dir]

_smudge(repository_ctx, srcs)

# with bzlmod the name is qualified with `~` separators, and we want the base name here

name = repository_ctx.name.split("~")[-1]

repository_ctx.file("BUILD.bazel", """

""".format(name = name, files = repr([src.basename for src in srcs])))

lfs_archive = repository_rule(

doc = "Export the contents from an on-demand LFS archive. The corresponding path should be added to be ignored " +

"in `.lfsconfig`.",

implementation = _download_and_extract_lfs,

attrs = {

"src": attr.label(mandatory = True, doc = "Local path to the LFS archive to extract."),

"build_file_content": attr.string(doc = "The content for the BUILD file for this repository. " +

"Either build_file or build_file_content can be specified, but not both."),

"build_file": attr.label(doc = "The file to use as the BUILD file for this repository. " +

"Either build_file or build_file_content can be specified, but not both."),

"strip_prefix": attr.string(default = "", doc = "A directory prefix to strip from the extracted files. "),

},

)

lfs_files = repository_rule(

doc = "Export LFS files for on-demand download. Exactly one between `srcs` and `dir` must be defined. The " +

"corresponding paths should be added to be ignored in `.lfsconfig`.",

implementation = _download_lfs,

attrs = {

"srcs": attr.label_list(doc = "Local paths to the LFS files to export."),

"dir": attr.label(doc = "Local path to a directory containing LFS files to export. Only the direct contents " +

"of the directory are exported"),

},

)