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152 lines
6.4 KiB
152 lines
6.4 KiB
import os
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import shutil
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from pathlib import Path
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from typing import Tuple
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from wasabi import msg
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from .commands import run_command
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from .filesystem import is_subpath_of, make_tempdir
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def git_checkout(
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repo: str, subpath: str, dest: Path, *, branch: str = "master", sparse: bool = False
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):
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git_version = get_git_version()
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if dest.exists():
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msg.fail("Destination of checkout must not exist", exits=1)
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if not dest.parent.exists():
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msg.fail("Parent of destination of checkout must exist", exits=1)
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if sparse and git_version >= (2, 22):
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return git_sparse_checkout(repo, subpath, dest, branch)
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elif sparse:
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# Only show warnings if the user explicitly wants sparse checkout but
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# the Git version doesn't support it
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err_old = (
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f"You're running an old version of Git (v{git_version[0]}.{git_version[1]}) "
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f"that doesn't fully support sparse checkout yet."
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)
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err_unk = "You're running an unknown version of Git, so sparse checkout has been disabled."
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msg.warn(
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f"{err_unk if git_version == (0, 0) else err_old} "
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f"This means that more files than necessary may be downloaded "
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f"temporarily. To only download the files needed, make sure "
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f"you're using Git v2.22 or above."
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)
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with make_tempdir() as tmp_dir:
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cmd = f"git -C {tmp_dir} clone {repo} . -b {branch}"
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run_command(cmd, capture=True)
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# We need Path(name) to make sure we also support subdirectories
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try:
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source_path = tmp_dir / Path(subpath)
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if not is_subpath_of(tmp_dir, source_path):
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err = f"'{subpath}' is a path outside of the cloned repository."
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msg.fail(err, repo, exits=1)
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if os.path.isdir(source_path):
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shutil.copytree(source_path, dest)
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else:
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shutil.copyfile(source_path, dest)
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except FileNotFoundError:
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err = f"Can't clone {subpath}. Make sure the directory exists in the repo (branch '{branch}')"
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msg.fail(err, repo, exits=1)
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def git_sparse_checkout(repo, subpath, dest, branch):
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# We're using Git, partial clone and sparse checkout to
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# only clone the files we need
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# This ends up being RIDICULOUS. omg.
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# So, every tutorial and SO post talks about 'sparse checkout'...But they
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# go and *clone* the whole repo. Worthless. And cloning part of a repo
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# turns out to be completely broken. The only way to specify a "path" is..
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# a path *on the server*? The contents of which, specifies the paths. Wat.
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# Obviously this is hopelessly broken and insecure, because you can query
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# arbitrary paths on the server! So nobody enables this.
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# What we have to do is disable *all* files. We could then just checkout
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# the path, and it'd "work", but be hopelessly slow...Because it goes and
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# transfers every missing object one-by-one. So the final piece is that we
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# need to use some weird git internals to fetch the missings in bulk, and
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# *that* we can do by path.
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# We're using Git and sparse checkout to only clone the files we need
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with make_tempdir() as tmp_dir:
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# This is the "clone, but don't download anything" part.
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cmd = (
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f"git clone {repo} {tmp_dir} --no-checkout --depth 1 "
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f"-b {branch} --filter=blob:none"
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)
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run_command(cmd)
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# Now we need to find the missing filenames for the subpath we want.
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# Looking for this 'rev-list' command in the git --help? Hah.
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cmd = f"git -C {tmp_dir} rev-list --objects --all --missing=print -- {subpath}"
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ret = run_command(cmd, capture=True)
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git_repo = _http_to_git(repo)
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# Now pass those missings into another bit of git internals
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missings = " ".join([x[1:] for x in ret.stdout.split() if x.startswith("?")])
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if not missings:
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err = (
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f"Could not find any relevant files for '{subpath}'. "
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f"Did you specify a correct and complete path within repo '{repo}' "
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f"and branch {branch}?"
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)
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msg.fail(err, exits=1)
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cmd = f"git -C {tmp_dir} fetch-pack {git_repo} {missings}"
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run_command(cmd, capture=True)
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# And finally, we can checkout our subpath
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cmd = f"git -C {tmp_dir} checkout {branch} {subpath}"
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run_command(cmd, capture=True)
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# Get a subdirectory of the cloned path, if appropriate
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source_path = tmp_dir / Path(subpath)
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if not is_subpath_of(tmp_dir, source_path):
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err = f"'{subpath}' is a path outside of the cloned repository."
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msg.fail(err, repo, exits=1)
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shutil.move(str(source_path), str(dest))
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def git_repo_branch_exists(repo: str, branch: str) -> bool:
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"""Uses 'git ls-remote' to check if a repository and branch exists
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repo (str): URL to get repo.
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branch (str): Branch on repo to check.
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RETURNS (bool): True if repo:branch exists.
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"""
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get_git_version()
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cmd = f"git ls-remote {repo} {branch}"
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# We might be tempted to use `--exit-code` with `git ls-remote`, but
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# `run_command` handles the `returncode` for us, so we'll rely on
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# the fact that stdout returns '' if the requested branch doesn't exist
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ret = run_command(cmd, capture=True)
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exists = ret.stdout != ""
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return exists
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def get_git_version(
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error: str = "Could not run 'git'. Make sure it's installed and the executable is available.",
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) -> Tuple[int, int]:
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"""Get the version of git and raise an error if calling 'git --version' fails.
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error (str): The error message to show.
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RETURNS (Tuple[int, int]): The version as a (major, minor) tuple. Returns
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(0, 0) if the version couldn't be determined.
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"""
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try:
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ret = run_command("git --version", capture=True)
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except Exception:
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raise RuntimeError(error)
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stdout = ret.stdout.strip()
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if not stdout or not stdout.startswith("git version"):
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return 0, 0
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version = stdout[11:].strip().split(".")
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return int(version[0]), int(version[1])
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def _http_to_git(repo: str) -> str:
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if repo.startswith("http://"):
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repo = repo.replace(r"http://", r"https://")
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if repo.startswith(r"https://"):
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repo = repo.replace("https://", "git@").replace("/", ":", 1)
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if repo.endswith("/"):
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repo = repo[:-1]
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repo = f"{repo}.git"
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return repo
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