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import logging
import os.path
import pathlib
import re
import urllib.parse
import urllib.request
from typing import List, Optional, Tuple
from pip._internal.exceptions import BadCommand, InstallationError
from pip._internal.utils.misc import HiddenText, display_path, hide_url
from pip._internal.utils.subprocess import make_command
from pip._internal.vcs.versioncontrol import (
AuthInfo,
RemoteNotFoundError,
RemoteNotValidError,
RevOptions,
VersionControl,
find_path_to_project_root_from_repo_root,
vcs,
)
urlsplit = urllib.parse.urlsplit
urlunsplit = urllib.parse.urlunsplit
logger = logging.getLogger(__name__)
GIT_VERSION_REGEX = re.compile(
r"^git version " # Prefix.
r"(\d+)" # Major.
r"\.(\d+)" # Dot, minor.
r"(?:\.(\d+))?" # Optional dot, patch.
r".*$" # Suffix, including any pre- and post-release segments we don't care about.
)
HASH_REGEX = re.compile("^[a-fA-F0-9]{40}$")
# SCP (Secure copy protocol) shorthand. e.g. 'git@example.com:foo/bar.git'
SCP_REGEX = re.compile(
r"""^
# Optional user, e.g. 'git@'
(\w+@)?
# Server, e.g. 'github.com'.
([^/:]+):
# The server-side path. e.g. 'user/project.git'. Must start with an
# alphanumeric character so as not to be confusable with a Windows paths
# like 'C:/foo/bar' or 'C:\foo\bar'.
(\w[^:]*)
$""",
re.VERBOSE,
)
def looks_like_hash(sha: str) -> bool:
return bool(HASH_REGEX.match(sha))
class Git(VersionControl):
name = "git"
dirname = ".git"
repo_name = "clone"
schemes = (
"git+http",
"git+https",
"git+ssh",
"git+git",
"git+file",
)
# Prevent the user's environment variables from interfering with pip:
# https://github.com/pypa/pip/issues/1130
unset_environ = ("GIT_DIR", "GIT_WORK_TREE")
default_arg_rev = "HEAD"
@staticmethod
def get_base_rev_args(rev: str) -> List[str]:
return [rev]
def is_immutable_rev_checkout(self, url: str, dest: str) -> bool:
_, rev_options = self.get_url_rev_options(hide_url(url))
if not rev_options.rev:
return False
if not self.is_commit_id_equal(dest, rev_options.rev):
# the current commit is different from rev,
# which means rev was something else than a commit hash
return False
# return False in the rare case rev is both a commit hash
# and a tag or a branch; we don't want to cache in that case
# because that branch/tag could point to something else in the future
is_tag_or_branch = bool(self.get_revision_sha(dest, rev_options.rev)[0])
return not is_tag_or_branch
def get_git_version(self) -> Tuple[int, ...]:
version = self.run_command(
["version"],
command_desc="git version",
show_stdout=False,
stdout_only=True,
)
match = GIT_VERSION_REGEX.match(version)
if not match:
logger.warning("Can't parse git version: %s", version)
return ()
return tuple(int(c) for c in match.groups())
@classmethod
def get_current_branch(cls, location: str) -> Optional[str]:
"""
Return the current branch, or None if HEAD isn't at a branch
(e.g. detached HEAD).
"""
# git-symbolic-ref exits with empty stdout if "HEAD" is a detached
# HEAD rather than a symbolic ref. In addition, the -q causes the
# command to exit with status code 1 instead of 128 in this case
# and to suppress the message to stderr.
args = ["symbolic-ref", "-q", "HEAD"]
output = cls.run_command(
args,
extra_ok_returncodes=(1,),
show_stdout=False,
stdout_only=True,
cwd=location,
)
ref = output.strip()
if ref.startswith("refs/heads/"):
return ref[len("refs/heads/") :]
return None
@classmethod
def get_revision_sha(cls, dest: str, rev: str) -> Tuple[Optional[str], bool]:
"""
Return (sha_or_none, is_branch), where sha_or_none is a commit hash
if the revision names a remote branch or tag, otherwise None.
Args:
dest: the repository directory.
rev: the revision name.
"""
# Pass rev to pre-filter the list.
output = cls.run_command(
["show-ref", rev],
cwd=dest,
show_stdout=False,
stdout_only=True,
on_returncode="ignore",
)
refs = {}
# NOTE: We do not use splitlines here since that would split on other
# unicode separators, which can be maliciously used to install a
# different revision.
for line in output.strip().split("\n"):
line = line.rstrip("\r")
if not line:
continue
try:
ref_sha, ref_name = line.split(" ", maxsplit=2)
except ValueError:
# Include the offending line to simplify troubleshooting if
# this error ever occurs.
raise ValueError(f"unexpected show-ref line: {line!r}")
refs[ref_name] = ref_sha
branch_ref = f"refs/remotes/origin/{rev}"
tag_ref = f"refs/tags/{rev}"
sha = refs.get(branch_ref)
if sha is not None:
return (sha, True)
sha = refs.get(tag_ref)
return (sha, False)
@classmethod
def _should_fetch(cls, dest: str, rev: str) -> bool:
"""
Return true if rev is a ref or is a commit that we don't have locally.
Branches and tags are not considered in this method because they are
assumed to be always available locally (which is a normal outcome of
``git clone`` and ``git fetch --tags``).
"""
if rev.startswith("refs/"):
# Always fetch remote refs.
return True
if not looks_like_hash(rev):
# Git fetch would fail with abbreviated commits.
return False
if cls.has_commit(dest, rev):
# Don't fetch if we have the commit locally.
return False
return True
@classmethod
def resolve_revision(
cls, dest: str, url: HiddenText, rev_options: RevOptions
) -> RevOptions:
"""
Resolve a revision to a new RevOptions object with the SHA1 of the
branch, tag, or ref if found.
Args:
rev_options: a RevOptions object.
"""
rev = rev_options.arg_rev
# The arg_rev property's implementation for Git ensures that the
# rev return value is always non-None.
assert rev is not None
sha, is_branch = cls.get_revision_sha(dest, rev)
if sha is not None:
rev_options = rev_options.make_new(sha)
rev_options.branch_name = rev if is_branch else None
return rev_options
# Do not show a warning for the common case of something that has
# the form of a Git commit hash.
if not looks_like_hash(rev):
logger.warning(
"Did not find branch or tag '%s', assuming revision or ref.",
rev,
)
if not cls._should_fetch(dest, rev):
return rev_options
# fetch the requested revision
cls.run_command(
make_command("fetch", "-q", url, rev_options.to_args()),
cwd=dest,
)
# Change the revision to the SHA of the ref we fetched
sha = cls.get_revision(dest, rev="FETCH_HEAD")
rev_options = rev_options.make_new(sha)
return rev_options
@classmethod
def is_commit_id_equal(cls, dest: str, name: Optional[str]) -> bool:
"""
Return whether the current commit hash equals the given name.
Args:
dest: the repository directory.
name: a string name.
"""
if not name:
# Then avoid an unnecessary subprocess call.
return False
return cls.get_revision(dest) == name
def fetch_new(
self, dest: str, url: HiddenText, rev_options: RevOptions, verbosity: int
) -> None:
rev_display = rev_options.to_display()
logger.info("Cloning %s%s to %s", url, rev_display, display_path(dest))
if verbosity <= 0:
flags: Tuple[str, ...] = ("--quiet",)
elif verbosity == 1:
flags = ()
else:
flags = ("--verbose", "--progress")
if self.get_git_version() >= (2, 17):
# Git added support for partial clone in 2.17
# https://git-scm.com/docs/partial-clone
# Speeds up cloning by functioning without a complete copy of repository
self.run_command(
make_command(
"clone",
"--filter=blob:none",
*flags,
url,
dest,
)
)
else:
self.run_command(make_command("clone", *flags, url, dest))
if rev_options.rev:
# Then a specific revision was requested.
rev_options = self.resolve_revision(dest, url, rev_options)
branch_name = getattr(rev_options, "branch_name", None)
logger.debug("Rev options %s, branch_name %s", rev_options, branch_name)
if branch_name is None:
# Only do a checkout if the current commit id doesn't match
# the requested revision.
if not self.is_commit_id_equal(dest, rev_options.rev):
cmd_args = make_command(
"checkout",
"-q",
rev_options.to_args(),
)
self.run_command(cmd_args, cwd=dest)
elif self.get_current_branch(dest) != branch_name:
# Then a specific branch was requested, and that branch
# is not yet checked out.
track_branch = f"origin/{branch_name}"
cmd_args = [
"checkout",
"-b",
branch_name,
"--track",
track_branch,
]
self.run_command(cmd_args, cwd=dest)
else:
sha = self.get_revision(dest)
rev_options = rev_options.make_new(sha)
logger.info("Resolved %s to commit %s", url, rev_options.rev)
#: repo may contain submodules
self.update_submodules(dest)
def switch(self, dest: str, url: HiddenText, rev_options: RevOptions) -> None:
self.run_command(
make_command("config", "remote.origin.url", url),
cwd=dest,
)
cmd_args = make_command("checkout", "-q", rev_options.to_args())
self.run_command(cmd_args, cwd=dest)
self.update_submodules(dest)
def update(self, dest: str, url: HiddenText, rev_options: RevOptions) -> None:
# First fetch changes from the default remote
if self.get_git_version() >= (1, 9):
# fetch tags in addition to everything else
self.run_command(["fetch", "-q", "--tags"], cwd=dest)
else:
self.run_command(["fetch", "-q"], cwd=dest)
# Then reset to wanted revision (maybe even origin/master)
rev_options = self.resolve_revision(dest, url, rev_options)
cmd_args = make_command("reset", "--hard", "-q", rev_options.to_args())
self.run_command(cmd_args, cwd=dest)
#: update submodules
self.update_submodules(dest)
@classmethod
def get_remote_url(cls, location: str) -> str:
"""
Return URL of the first remote encountered.
Raises RemoteNotFoundError if the repository does not have a remote
url configured.
"""
# We need to pass 1 for extra_ok_returncodes since the command
# exits with return code 1 if there are no matching lines.
stdout = cls.run_command(
["config", "--get-regexp", r"remote\..*\.url"],
extra_ok_returncodes=(1,),
show_stdout=False,
stdout_only=True,
cwd=location,
)
remotes = stdout.splitlines()
try:
found_remote = remotes[0]
except IndexError:
raise RemoteNotFoundError
for remote in remotes:
if remote.startswith("remote.origin.url "):
found_remote = remote
break
url = found_remote.split(" ")[1]
return cls._git_remote_to_pip_url(url.strip())
@staticmethod
def _git_remote_to_pip_url(url: str) -> str:
"""
Convert a remote url from what git uses to what pip accepts.
There are 3 legal forms **url** may take:
1. A fully qualified url: ssh://git@example.com/foo/bar.git
2. A local project.git folder: /path/to/bare/repository.git
3. SCP shorthand for form 1: git@example.com:foo/bar.git
Form 1 is output as-is. Form 2 must be converted to URI and form 3 must
be converted to form 1.
See the corresponding test test_git_remote_url_to_pip() for examples of
sample inputs/outputs.
"""
if re.match(r"\w+://", url):
# This is already valid. Pass it though as-is.
return url
if os.path.exists(url):
# A local bare remote (git clone --mirror).
# Needs a file:// prefix.
return pathlib.PurePath(url).as_uri()
scp_match = SCP_REGEX.match(url)
if scp_match:
# Add an ssh:// prefix and replace the ':' with a '/'.
return scp_match.expand(r"ssh://\1\2/\3")
# Otherwise, bail out.
raise RemoteNotValidError(url)
@classmethod
def has_commit(cls, location: str, rev: str) -> bool:
"""
Check if rev is a commit that is available in the local repository.
"""
try:
cls.run_command(
["rev-parse", "-q", "--verify", "sha^" + rev],
cwd=location,
log_failed_cmd=False,
)
except InstallationError:
return False
else:
return True
@classmethod
def get_revision(cls, location: str, rev: Optional[str] = None) -> str:
if rev is None:
rev = "HEAD"
current_rev = cls.run_command(
["rev-parse", rev],
show_stdout=False,
stdout_only=True,
cwd=location,
)
return current_rev.strip()
@classmethod
def get_subdirectory(cls, location: str) -> Optional[str]:
"""
Return the path to Python project root, relative to the repo root.
Return None if the project root is in the repo root.
"""
# find the repo root
git_dir = cls.run_command(
["rev-parse", "--git-dir"],
show_stdout=False,
stdout_only=True,
cwd=location,
).strip()
if not os.path.isabs(git_dir):
git_dir = os.path.join(location, git_dir)
repo_root = os.path.abspath(os.path.join(git_dir, ".."))
return find_path_to_project_root_from_repo_root(location, repo_root)
@classmethod
def get_url_rev_and_auth(cls, url: str) -> Tuple[str, Optional[str], AuthInfo]:
"""
Prefixes stub URLs like 'user@hostname:user/repo.git' with 'ssh://'.
That's required because although they use SSH they sometimes don't
work with a ssh:// scheme (e.g. GitHub). But we need a scheme for
parsing. Hence we remove it again afterwards and return it as a stub.
"""
# Works around an apparent Git bug
# (see https://article.gmane.org/gmane.comp.version-control.git/146500)
scheme, netloc, path, query, fragment = urlsplit(url)
if scheme.endswith("file"):
initial_slashes = path[: -len(path.lstrip("/"))]
newpath = initial_slashes + urllib.request.url2pathname(path).replace(
"\\", "/"
).lstrip("/")
after_plus = scheme.find("+") + 1
url = scheme[:after_plus] + urlunsplit(
(scheme[after_plus:], netloc, newpath, query, fragment),
)
if "://" not in url:
assert "file:" not in url
url = url.replace("git+", "git+ssh://")
url, rev, user_pass = super().get_url_rev_and_auth(url)
url = url.replace("ssh://", "")
else:
url, rev, user_pass = super().get_url_rev_and_auth(url)
return url, rev, user_pass
@classmethod
def update_submodules(cls, location: str) -> None:
if not os.path.exists(os.path.join(location, ".gitmodules")):
return
cls.run_command(
["submodule", "update", "--init", "--recursive", "-q"],
cwd=location,
)
@classmethod
def get_repository_root(cls, location: str) -> Optional[str]:
loc = super().get_repository_root(location)
if loc:
return loc
try:
r = cls.run_command(
["rev-parse", "--show-toplevel"],
cwd=location,
show_stdout=False,
stdout_only=True,
on_returncode="raise",
log_failed_cmd=False,
)
except BadCommand:
logger.debug(
"could not determine if %s is under git control "
"because git is not available",
location,
)
return None
except InstallationError:
return None
return os.path.normpath(r.rstrip("\r\n"))
@staticmethod
def should_add_vcs_url_prefix(repo_url: str) -> bool:
"""In either https or ssh form, requirements must be prefixed with git+."""
return True
vcs.register(Git)