From 7342b40d920864dcd341d9ac853bc1da8404c2cd Mon Sep 17 00:00:00 2001 From: Julio Biason Date: Fri, 9 Dec 2022 15:43:38 -0300 Subject: [PATCH] A sparse-checkout without sparse-checkout --- sparse-checkout/README.md | 27 ++++ sparse-checkout/poetry.lock | 238 +++++++++++++++++++++++++++++++++ sparse-checkout/pyproject.toml | 16 +++ sparse-checkout/sc.py | 139 +++++++++++++++++++ 4 files changed, 420 insertions(+) create mode 100644 sparse-checkout/README.md create mode 100644 sparse-checkout/poetry.lock create mode 100644 sparse-checkout/pyproject.toml create mode 100644 sparse-checkout/sc.py diff --git a/sparse-checkout/README.md b/sparse-checkout/README.md new file mode 100644 index 0000000..2230c00 --- /dev/null +++ b/sparse-checkout/README.md @@ -0,0 +1,27 @@ +# Sparse-Checkout + +This code tries to simulate the way `sparse-checkout` works in recent Git +versions. + +## The Problem + +The problem is that the behaviour of `sparse-checkout` changed somewhere in the +line. In most recent versions, `sparse-checkout init`, on a clone, will hide +every single file; older versions, though, will refuse to init the +`sparse-checkout` if that would leave the current directory empty. + +## Solution + +The idea is to push `update-index --skip-worktree` to tag a file as "being +ignored" (Git will always assume the file checksum is still the same as in the +index, no matter what you do with the file). Then, when a user wants to +re-enable the directory/file, use `update-index --no-skip-worktree`. + +Although that sounds simple, there an issue that Git deals only with files and +not directories, and trying to disable/enable the file in the index requires to +pass the files; for example, on the re-enable, how to find the names of the +files we just deleted? + +That requires a combination of use with `ls-files --cached [pattern]`. This way +we can get all the files that need to be pushed back/ignored, reading directly +from the Git information. diff --git a/sparse-checkout/poetry.lock b/sparse-checkout/poetry.lock new file mode 100644 index 0000000..110f2eb --- /dev/null +++ b/sparse-checkout/poetry.lock @@ -0,0 +1,238 @@ +[[package]] +name = "black" +version = "22.12.0" +description = "The uncompromising code formatter." +category = "dev" +optional = false +python-versions = ">=3.7" + +[package.dependencies] +click = ">=8.0.0" +mypy-extensions = ">=0.4.3" +pathspec = ">=0.9.0" +platformdirs = ">=2" +tomli = {version = ">=1.1.0", markers = "python_full_version < \"3.11.0a7\""} +typed-ast = {version = ">=1.4.2", markers = "python_version < \"3.8\" and implementation_name == \"cpython\""} +typing-extensions = {version = ">=3.10.0.0", markers = "python_version < \"3.10\""} + +[package.extras] +colorama = ["colorama (>=0.4.3)"] +d = ["aiohttp (>=3.7.4)"] +jupyter = ["ipython (>=7.8.0)", "tokenize-rt (>=3.2.0)"] 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hash = "sha256:a7a22e05929290a67401440b39690ae6563279bced5f314609d9d03798f56766"}, +] diff --git a/sparse-checkout/pyproject.toml b/sparse-checkout/pyproject.toml new file mode 100644 index 0000000..5534f8b --- /dev/null +++ b/sparse-checkout/pyproject.toml @@ -0,0 +1,16 @@ +[tool.poetry] +name = "sparse-checkout" +version = "0.1.0" +description = "" +authors = ["Julio Biason "] + +[tool.poetry.dependencies] +python = ">=3.7" + +[tool.poetry.dev-dependencies] +pyright = "^1.1.283" +black = "^22.12.0" + +[build-system] +requires = ["poetry-core>=1.0.0"] +build-backend = "poetry.core.masonry.api" diff --git a/sparse-checkout/sc.py b/sparse-checkout/sc.py new file mode 100644 index 0000000..9ac2208 --- /dev/null +++ b/sparse-checkout/sc.py @@ -0,0 +1,139 @@ +#!/bin/env python + +import shutil +import subprocess +import os + +from argparse import ArgumentParser +from pathlib import Path +from typing import List +from typing import Optional +from typing import Generator + + +GIT_EXE = shutil.which("git", mode=os.X_OK) +WORKING_DIRECTORY = Path.cwd() / "test" + + +def run(command: str, args: List[str]): + """Run Git with the specified arguments.""" + full_command = [str(GIT_EXE)] + full_command.extend(command.split()) + full_command.extend(args) + + result = None + print(f"Git: {full_command}") + proc = subprocess.Popen( + full_command, + stdout=subprocess.PIPE, + stderr=subprocess.PIPE, + cwd=WORKING_DIRECTORY, + ) + result = proc.communicate() + (out, err) = result + print(f"Out:\n{out}") + print(f"Err:\n{err}") + return result + + +def files(base: Optional[str] = None) -> List[str]: + """Return the list of files for the base directory or all the files in the + repo in case there is no base. + """ + params = ["--cached"] + if base: + params.append(base) + result = run("ls-files", params) + return result[0].decode("utf-8").strip().split("\n") + + +def hide(files: List[str]): + """Hide a list of files by tagging them to skip the worktree.""" + params = ["--skip-worktree", "--force-remove"] + params.extend(files) + run("update-index", params) + + +def show(files: List[str]): + """Display files by removing the tagging to skip the worktree.""" + params = ["--no-skip-worktree"] + params.extend(files) + run("update-index", params) + run("checkout", files) + + +def bases(files: List[str]) -> Generator[str, None, None]: + """Produces only the bases for the list of files.""" + last_seen = None + for filename in files: + as_path = Path(filename) + base = as_path.parts[0] + if base != last_seen: + yield base + last_seen = base + + +def clone(args): + print(f"Clonining {args.url} on {args.branch}") + shutil.rmtree(WORKING_DIRECTORY, ignore_errors=True) + WORKING_DIRECTORY.mkdir() + run( + "clone", + ["--no-checkout", args.url, "--branch", args.branch, str(WORKING_DIRECTORY)], + ) + run("reset", []) + hide(files()) + + +def enable(args): + """Make the files under a directory available again.""" + print(f"Enabling {args.path}") + to_enable = [] + for base in args.path: + to_enable.extend(files(base)) + show(to_enable) + + +def disable(args): + """Make the files under a directory unavailable.""" + print(f"Disabling {args.path}") + to_enable = [] + for base in args.path: + to_enable.extend(files(base)) + hide(to_enable) + for base in args.path: + shutil.rmtree(WORKING_DIRECTORY / base, ignore_errors=True) + + +def list(_args): + """List all the bases available.""" + for filename in bases(files()): + print(f"{filename}") + + +def main(): + parser = ArgumentParser() + subparsers = parser.add_subparsers() + + clone_cmd = subparsers.add_parser("clone") + clone_cmd.add_argument("url") + clone_cmd.add_argument("branch") + clone_cmd.set_defaults(func=clone) + + enable_cmd = subparsers.add_parser("enable") + enable_cmd.add_argument("path", nargs="+") + enable_cmd.set_defaults(func=enable) + + disable_cmd = subparsers.add_parser("disable") + disable_cmd.add_argument("path", nargs="+") + disable_cmd.set_defaults(func=disable) + + list_cmd = subparsers.add_parser("list") + list_cmd.set_defaults(func=list) + + args = parser.parse_args() + args.func(args) + + +if __name__ == "__main__": + main()