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fun.py
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"""Package with general repository related functions"""
from __future__importannotations
importos
importstat
fromstringimportdigits
fromgit.excimportWorkTreeRepositoryUnsupported
fromgit.objectsimportObject
fromgit.refsimportSymbolicReference
fromgit.utilimporthex_to_bin,bin_to_hex,decygpath
fromgitdb.excimport (
BadObject,
BadName,
)
importos.pathasosp
fromgit.cmdimportGit
# Typing ----------------------------------------------------------------------
fromtypingimportUnion,Optional,cast,TYPE_CHECKING
fromgit.typesimportCommit_ish
ifTYPE_CHECKING:
fromgit.typesimportPathLike
from .baseimportRepo
fromgit.dbimportGitCmdObjectDB
fromgit.refs.referenceimportReference
fromgit.objectsimportCommit,TagObject,Blob,Tree
fromgit.refs.tagimportTag
# ----------------------------------------------------------------------------
__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')
deftouch(filename:str)->str:
withopen(filename,"ab"):
pass
returnfilename
defis_git_dir(d:'PathLike')->bool:
""" 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."""
ifosp.isdir(d):
if (osp.isdir(osp.join(d,'objects'))or'GIT_OBJECT_DIRECTORY'inos.environ) \
andosp.isdir(osp.join(d,'refs')):
headref=osp.join(d,'HEAD')
returnosp.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'))):
raiseWorkTreeRepositoryUnsupported(d)
returnFalse
deffind_worktree_git_dir(dotgit:'PathLike')->Optional[str]:
"""Search for a gitdir for this worktree."""
try:
statbuf=os.stat(dotgit)
exceptOSError:
returnNone
ifnotstat.S_ISREG(statbuf.st_mode):
returnNone
try:
lines=open(dotgit,'r').readlines()
forkey,valuein [line.strip().split(': ')forlineinlines]:
ifkey=='gitdir':
returnvalue
exceptValueError:
pass
returnNone
deffind_submodule_git_dir(d:'PathLike')->Optional['PathLike']:
"""Search for a submodule repo."""
ifis_git_dir(d):
returnd
try:
withopen(d)asfp:
content=fp.read().rstrip()
exceptIOError:
# it's probably not a file
pass
else:
ifcontent.startswith('gitdir: '):
path=content[8:]
ifGit.is_cygwin():
## Cygwin creates submodules prefixed with `/cygdrive/...` suffixes.
path=decygpath(path)
ifnotosp.isabs(path):
path=osp.normpath(osp.join(osp.dirname(d),path))
returnfind_submodule_git_dir(path)
# end handle exception
returnNone
defshort_to_long(odb:'GitCmdObjectDB',hexsha:str)->Optional[bytes]:
""":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:
returnbin_to_hex(odb.partial_to_complete_sha_hex(hexsha))
exceptBadObject:
returnNone
# END exception handling
defname_to_object(repo:'Repo',name:str,return_ref:bool=False
)->Union[SymbolicReference,'Commit','TagObject','Blob','Tree']:
"""
: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:Union[None,str,bytes]=None
# is it a hexsha ? Try the most common ones, which is 7 to 40
ifrepo.re_hexsha_shortened.match(name):
iflen(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
ifhexshaisNone:
forbasein ('%s','refs/%s','refs/tags/%s','refs/heads/%s','refs/remotes/%s','refs/remotes/%s/HEAD'):
try:
hexsha=SymbolicReference.dereference_recursive(repo,base%name)
ifreturn_ref:
returnSymbolicReference(repo,base%name)
# END handle symbolic ref
break
exceptValueError:
pass
# END for each base
# END handle hexsha
# didn't find any ref, this is an error
ifreturn_ref:
raiseBadObject("Couldn't find reference named %r"%name)
# END handle return ref
# tried everything ? fail
ifhexshaisNone:
raiseBadName(name)
# END assert hexsha was found
returnObject.new_from_sha(repo,hex_to_bin(hexsha))
defderef_tag(tag:'Tag')->'TagObject':
"""Recursively dereference a tag and return the resulting object"""
whileTrue:
try:
tag=tag.object
exceptAttributeError:
break
# END dereference tag
returntag
defto_commit(obj:Object)->Union['Commit','TagObject']:
"""Convert the given object to a commit if possible and return it"""
ifobj.type=='tag':
obj=deref_tag(obj)
ifobj.type!="commit":
raiseValueError("Cannot convert object %r to type commit"%obj)
# END verify type
returnobj
defrev_parse(repo:'Repo',rev:str)->Union['Commit','Tag','Tree','Blob']:
"""
: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 ?
ifrev.startswith(':/'):
# colon search mode
raiseNotImplementedError("commit by message search ( regex )")
# END handle search
obj:Union[Commit_ish,'Reference',None]=None
ref=None
output_type="commit"
start=0
parsed_to=0
lr=len(rev)
whilestart<lr:
ifrev[start]notin"^~:@":
start+=1
continue
# END handle start
token=rev[start]
ifobjisNone:
# token is a rev name
ifstart==0:
ref=repo.head.ref
else:
iftoken=='@':
ref=cast('Reference',name_to_object(repo,rev[:start],return_ref=True))
else:
obj=cast(Commit_ish,name_to_object(repo,rev[:start]))
# END handle token
# END handle refname
else:
assertobjisnotNone
ifrefisnotNone:
obj=cast('Commit',ref.commit)
# END handle ref
# END initialize obj on first token
start+=1
# try to parse {type}
ifstart<lrandrev[start]=='{':
end=rev.find('}',start)
ifend==-1:
raiseValueError("Missing closing brace to define type in %s"%rev)
output_type=rev[start+1:end]# exclude brace
# handle type
ifoutput_type=='commit':
pass# default
elifoutput_type=='tree':
try:
obj=cast(Commit_ish,obj)
obj=to_commit(obj).tree
except (AttributeError,ValueError):
pass# error raised later
# END exception handling
elifoutput_typein ('','blob'):
obj=cast('TagObject',obj)
ifobjandobj.type=='tag':
obj=deref_tag(obj)
else:
# cannot do anything for non-tags
pass
# END handle tag
eliftoken=='@':
# try single int
assertrefisnotNone,"Requre Reference to access reflog"
revlog_index=None
try:
# transform reversed index into the format of our revlog
revlog_index=-(int(output_type)+1)
exceptValueErrorase:
# TODO: Try to parse the other date options, using parse_date
# maybe
raiseNotImplementedError("Support for additional @{...} modes not implemented")frome
# END handle revlog index
try:
entry=ref.log_entry(revlog_index)
exceptIndexErrorase:
raiseIndexError("Invalid revlog index: %i"%revlog_index)frome
# 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=''
else:
raiseValueError("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
ifoutput_typeandobjandobj.type!=output_type:
raiseValueError("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
iftoken!=":":
found_digit=False
whilestart<lr:
ifrev[start]indigits:
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
ifnotfound_digit:
num=1
# END set default num
# END number parsing only if non-blob mode
parsed_to=start
# handle hierarchy walk
try:
obj=cast(Commit_ish,obj)
iftoken=="~":
obj=to_commit(obj)
for_inrange(num):
obj=obj.parents[0]
# END for each history item to walk
eliftoken=="^":
obj=to_commit(obj)
# must be n'th parent
ifnum:
obj=obj.parents[num-1]
eliftoken==":":
ifobj.type!="tree":
obj=obj.tree
# END get tree type
obj=obj[rev[start:]]
parsed_to=lr
else:
raiseValueError("Invalid token: %r"%token)
# END end handle tag
except (IndexError,AttributeError)ase:
raiseBadName(
f"Invalid revision spec '{rev}' - not enough "
f"parent commits to reach '{token}{int(num)}'")frome
# END exception handling
# END parse loop
# still no obj ? Its probably a simple name
ifobjisNone:
obj=cast(Commit_ish,name_to_object(repo,rev))
parsed_to=lr
# END handle simple name
ifobjisNone:
raiseValueError("Revision specifier could not be parsed: %s"%rev)
ifparsed_to!=lr:
raiseValueError("Didn't consume complete rev spec %s, consumed part: %s"% (rev,rev[:parsed_to]))
returnobj