mirror of
https://github.com/thegeeklab/ansible-later.git
synced 2024-11-26 23:00:36 +00:00
345 lines
11 KiB
Python
345 lines
11 KiB
Python
"""Package with general repository related functions"""
|
|
import os
|
|
import stat
|
|
from string import digits
|
|
|
|
from git.compat import xrange
|
|
from git.exc import WorkTreeRepositoryUnsupported
|
|
from git.objects import Object
|
|
from git.refs import SymbolicReference
|
|
from git.util import hex_to_bin, bin_to_hex, decygpath
|
|
from gitdb.exc import (
|
|
BadObject,
|
|
BadName,
|
|
)
|
|
|
|
import os.path as osp
|
|
from git.cmd import Git
|
|
|
|
|
|
__all__ = ('rev_parse', 'is_git_dir', 'touch', 'find_submodule_git_dir', 'name_to_object', 'short_to_long', 'deref_tag',
|
|
'to_commit', 'find_worktree_git_dir')
|
|
|
|
|
|
def touch(filename):
|
|
with open(filename, "ab"):
|
|
pass
|
|
return filename
|
|
|
|
|
|
def is_git_dir(d):
|
|
""" This is taken from the git setup.c:is_git_directory
|
|
function.
|
|
|
|
@throws WorkTreeRepositoryUnsupported if it sees a worktree directory. It's quite hacky to do that here,
|
|
but at least clearly indicates that we don't support it.
|
|
There is the unlikely danger to throw if we see directories which just look like a worktree dir,
|
|
but are none."""
|
|
if osp.isdir(d):
|
|
if osp.isdir(osp.join(d, 'objects')) and osp.isdir(osp.join(d, 'refs')):
|
|
headref = osp.join(d, 'HEAD')
|
|
return osp.isfile(headref) or \
|
|
(osp.islink(headref) and
|
|
os.readlink(headref).startswith('refs'))
|
|
elif (osp.isfile(osp.join(d, 'gitdir')) and
|
|
osp.isfile(osp.join(d, 'commondir')) and
|
|
osp.isfile(osp.join(d, 'gitfile'))):
|
|
raise WorkTreeRepositoryUnsupported(d)
|
|
return False
|
|
|
|
|
|
def find_worktree_git_dir(dotgit):
|
|
"""Search for a gitdir for this worktree."""
|
|
try:
|
|
statbuf = os.stat(dotgit)
|
|
except OSError:
|
|
return None
|
|
if not stat.S_ISREG(statbuf.st_mode):
|
|
return None
|
|
|
|
try:
|
|
lines = open(dotgit, 'r').readlines()
|
|
for key, value in [line.strip().split(': ') for line in lines]:
|
|
if key == 'gitdir':
|
|
return value
|
|
except ValueError:
|
|
pass
|
|
return None
|
|
|
|
|
|
def find_submodule_git_dir(d):
|
|
"""Search for a submodule repo."""
|
|
if is_git_dir(d):
|
|
return d
|
|
|
|
try:
|
|
with open(d) as fp:
|
|
content = fp.read().rstrip()
|
|
except (IOError, OSError):
|
|
# it's probably not a file
|
|
pass
|
|
else:
|
|
if content.startswith('gitdir: '):
|
|
path = content[8:]
|
|
|
|
if Git.is_cygwin():
|
|
## Cygwin creates submodules prefixed with `/cygdrive/...` suffixes.
|
|
path = decygpath(path)
|
|
if not osp.isabs(path):
|
|
path = osp.join(osp.dirname(d), path)
|
|
return find_submodule_git_dir(path)
|
|
# end handle exception
|
|
return None
|
|
|
|
|
|
def short_to_long(odb, hexsha):
|
|
""":return: long hexadecimal sha1 from the given less-than-40 byte hexsha
|
|
or None if no candidate could be found.
|
|
:param hexsha: hexsha with less than 40 byte"""
|
|
try:
|
|
return bin_to_hex(odb.partial_to_complete_sha_hex(hexsha))
|
|
except BadObject:
|
|
return None
|
|
# END exception handling
|
|
|
|
|
|
def name_to_object(repo, name, return_ref=False):
|
|
"""
|
|
:return: object specified by the given name, hexshas ( short and long )
|
|
as well as references are supported
|
|
:param return_ref: if name specifies a reference, we will return the reference
|
|
instead of the object. Otherwise it will raise BadObject or BadName
|
|
"""
|
|
hexsha = None
|
|
|
|
# is it a hexsha ? Try the most common ones, which is 7 to 40
|
|
if repo.re_hexsha_shortened.match(name):
|
|
if len(name) != 40:
|
|
# find long sha for short sha
|
|
hexsha = short_to_long(repo.odb, name)
|
|
else:
|
|
hexsha = name
|
|
# END handle short shas
|
|
# END find sha if it matches
|
|
|
|
# if we couldn't find an object for what seemed to be a short hexsha
|
|
# try to find it as reference anyway, it could be named 'aaa' for instance
|
|
if hexsha is None:
|
|
for base in ('%s', 'refs/%s', 'refs/tags/%s', 'refs/heads/%s', 'refs/remotes/%s', 'refs/remotes/%s/HEAD'):
|
|
try:
|
|
hexsha = SymbolicReference.dereference_recursive(repo, base % name)
|
|
if return_ref:
|
|
return SymbolicReference(repo, base % name)
|
|
# END handle symbolic ref
|
|
break
|
|
except ValueError:
|
|
pass
|
|
# END for each base
|
|
# END handle hexsha
|
|
|
|
# didn't find any ref, this is an error
|
|
if return_ref:
|
|
raise BadObject("Couldn't find reference named %r" % name)
|
|
# END handle return ref
|
|
|
|
# tried everything ? fail
|
|
if hexsha is None:
|
|
raise BadName(name)
|
|
# END assert hexsha was found
|
|
|
|
return Object.new_from_sha(repo, hex_to_bin(hexsha))
|
|
|
|
|
|
def deref_tag(tag):
|
|
"""Recursively dereference a tag and return the resulting object"""
|
|
while True:
|
|
try:
|
|
tag = tag.object
|
|
except AttributeError:
|
|
break
|
|
# END dereference tag
|
|
return tag
|
|
|
|
|
|
def to_commit(obj):
|
|
"""Convert the given object to a commit if possible and return it"""
|
|
if obj.type == 'tag':
|
|
obj = deref_tag(obj)
|
|
|
|
if obj.type != "commit":
|
|
raise ValueError("Cannot convert object %r to type commit" % obj)
|
|
# END verify type
|
|
return obj
|
|
|
|
|
|
def rev_parse(repo, rev):
|
|
"""
|
|
:return: Object at the given revision, either Commit, Tag, Tree or Blob
|
|
:param rev: git-rev-parse compatible revision specification as string, please see
|
|
http://www.kernel.org/pub/software/scm/git/docs/git-rev-parse.html
|
|
for details
|
|
:raise BadObject: if the given revision could not be found
|
|
:raise ValueError: If rev couldn't be parsed
|
|
:raise IndexError: If invalid reflog index is specified"""
|
|
|
|
# colon search mode ?
|
|
if rev.startswith(':/'):
|
|
# colon search mode
|
|
raise NotImplementedError("commit by message search ( regex )")
|
|
# END handle search
|
|
|
|
obj = None
|
|
ref = None
|
|
output_type = "commit"
|
|
start = 0
|
|
parsed_to = 0
|
|
lr = len(rev)
|
|
while start < lr:
|
|
if rev[start] not in "^~:@":
|
|
start += 1
|
|
continue
|
|
# END handle start
|
|
|
|
token = rev[start]
|
|
|
|
if obj is None:
|
|
# token is a rev name
|
|
if start == 0:
|
|
ref = repo.head.ref
|
|
else:
|
|
if token == '@':
|
|
ref = name_to_object(repo, rev[:start], return_ref=True)
|
|
else:
|
|
obj = name_to_object(repo, rev[:start])
|
|
# END handle token
|
|
# END handle refname
|
|
|
|
if ref is not None:
|
|
obj = ref.commit
|
|
# END handle ref
|
|
# END initialize obj on first token
|
|
|
|
start += 1
|
|
|
|
# try to parse {type}
|
|
if start < lr and rev[start] == '{':
|
|
end = rev.find('}', start)
|
|
if end == -1:
|
|
raise ValueError("Missing closing brace to define type in %s" % rev)
|
|
output_type = rev[start + 1:end] # exclude brace
|
|
|
|
# handle type
|
|
if output_type == 'commit':
|
|
pass # default
|
|
elif output_type == 'tree':
|
|
try:
|
|
obj = to_commit(obj).tree
|
|
except (AttributeError, ValueError):
|
|
pass # error raised later
|
|
# END exception handling
|
|
elif output_type in ('', 'blob'):
|
|
if obj.type == 'tag':
|
|
obj = deref_tag(obj)
|
|
else:
|
|
# cannot do anything for non-tags
|
|
pass
|
|
# END handle tag
|
|
elif token == '@':
|
|
# try single int
|
|
assert ref is not None, "Requre Reference to access reflog"
|
|
revlog_index = None
|
|
try:
|
|
# transform reversed index into the format of our revlog
|
|
revlog_index = -(int(output_type) + 1)
|
|
except ValueError:
|
|
# TODO: Try to parse the other date options, using parse_date
|
|
# maybe
|
|
raise NotImplementedError("Support for additional @{...} modes not implemented")
|
|
# END handle revlog index
|
|
|
|
try:
|
|
entry = ref.log_entry(revlog_index)
|
|
except IndexError:
|
|
raise IndexError("Invalid revlog index: %i" % revlog_index)
|
|
# END handle index out of bound
|
|
|
|
obj = Object.new_from_sha(repo, hex_to_bin(entry.newhexsha))
|
|
|
|
# make it pass the following checks
|
|
output_type = None
|
|
else:
|
|
raise ValueError("Invalid output type: %s ( in %s )" % (output_type, rev))
|
|
# END handle output type
|
|
|
|
# empty output types don't require any specific type, its just about dereferencing tags
|
|
if output_type and obj.type != output_type:
|
|
raise ValueError("Could not accommodate requested object type %r, got %s" % (output_type, obj.type))
|
|
# END verify output type
|
|
|
|
start = end + 1 # skip brace
|
|
parsed_to = start
|
|
continue
|
|
# END parse type
|
|
|
|
# try to parse a number
|
|
num = 0
|
|
if token != ":":
|
|
found_digit = False
|
|
while start < lr:
|
|
if rev[start] in digits:
|
|
num = num * 10 + int(rev[start])
|
|
start += 1
|
|
found_digit = True
|
|
else:
|
|
break
|
|
# END handle number
|
|
# END number parse loop
|
|
|
|
# no explicit number given, 1 is the default
|
|
# It could be 0 though
|
|
if not found_digit:
|
|
num = 1
|
|
# END set default num
|
|
# END number parsing only if non-blob mode
|
|
|
|
parsed_to = start
|
|
# handle hierarchy walk
|
|
try:
|
|
if token == "~":
|
|
obj = to_commit(obj)
|
|
for _ in xrange(num):
|
|
obj = obj.parents[0]
|
|
# END for each history item to walk
|
|
elif token == "^":
|
|
obj = to_commit(obj)
|
|
# must be n'th parent
|
|
if num:
|
|
obj = obj.parents[num - 1]
|
|
elif token == ":":
|
|
if obj.type != "tree":
|
|
obj = obj.tree
|
|
# END get tree type
|
|
obj = obj[rev[start:]]
|
|
parsed_to = lr
|
|
else:
|
|
raise ValueError("Invalid token: %r" % token)
|
|
# END end handle tag
|
|
except (IndexError, AttributeError):
|
|
raise BadName("Invalid revision spec '%s' - not enough parent commits to reach '%s%i'" % (rev, token, num))
|
|
# END exception handling
|
|
# END parse loop
|
|
|
|
# still no obj ? Its probably a simple name
|
|
if obj is None:
|
|
obj = name_to_object(repo, rev)
|
|
parsed_to = lr
|
|
# END handle simple name
|
|
|
|
if obj is None:
|
|
raise ValueError("Revision specifier could not be parsed: %s" % rev)
|
|
|
|
if parsed_to != lr:
|
|
raise ValueError("Didn't consume complete rev spec %s, consumed part: %s" % (rev, rev[:parsed_to]))
|
|
|
|
return obj
|