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# This module is part of GitPython and is released under the
# 3-Clause BSD License: https://opensource.org/license/bsd-3-clause/
__all__
=
[
"SymbolicReference"
]
import
os
from
pathlib
import
Path
from
gitdb
.
exc
import
BadName
,
BadObject
from
git
.
compat
import
defenc
from
git
.
objects
.
base
import
Object
from
git
.
objects
.
commit
import
Commit
from
git
.
refs
.
log
import
RefLog
from
git
.
util
import
(
LockedFD
,
assure_directory_exists
,
hex_to_bin
,
join_path
,
join_path_native
,
to_native_path_linux
,
)
# typing ------------------------------------------------------------------
from
typing
import
(
Any
,
Iterator
,
List
,
TYPE_CHECKING
,
Tuple
,
Type
,
TypeVar
,
Union
,
cast
,
)
from
git
.
types
import
AnyGitObject
,
PathLike
if
TYPE_CHECKING
:
from
git
.
config
import
GitConfigParser
from
git
.
objects
.
commit
import
Actor
from
git
.
refs
.
log
import
RefLogEntry
from
git
.
refs
.
reference
import
Reference
from
git
.
repo
import
Repo
T_References
=
TypeVar
(
"T_References"
,
bound
=
"SymbolicReference"
)
# ------------------------------------------------------------------------------
def
_git_dir
(
repo
:
"Repo"
,
path
:
Union
[
PathLike
,
None
])
->
PathLike
:
"""Find the git dir that is appropriate for the path."""
name
=
f"
{
path
}
"
if
name
in
[
"HEAD"
,
"ORIG_HEAD"
,
"FETCH_HEAD"
,
"index"
,
"logs"
]:
return
repo
.
git_dir
return
repo
.
common_dir
class
SymbolicReference
:
"""A reference that can point to another reference or be detached.
An attached :class:`~git.refs.head.HEAD` usually points to a
:class:`~git.refs.head.Head`, which itself specifies a commit. A detached
:class:`~git.refs.head.HEAD` points directly to a commit instead.
Use :attr:`commit` to access the commit in either case, and :attr:`reference`
to access the target reference when attached.
"""
__slots__
=
(
"repo"
,
"path"
)
_resolve_ref_on_create
=
False
_points_to_commits_only
=
True
_common_path_default
=
""
_remote_common_path_default
=
"refs/remotes"
_id_attribute_
=
"name"
# Match Git's SYMREF_MAXDEPTH, counting the terminal reference as well.
_max_symref_depth
=
5
def
__init__
(
self
,
repo
:
"Repo"
,
path
:
PathLike
,
check_path
:
bool
=
False
)
->
None
:
self
.
repo
=
repo
self
.
path
:
PathLike
=
path
def
__str__
(
self
)
->
str
:
return
os
.
fspath
(
self
.
path
)
def
__repr__
(
self
)
->
str
:
return
'<git.%s "%s">'
%
(
self
.
__class__
.
__name__
,
self
.
path
)
def
__eq__
(
self
,
other
:
object
)
->
bool
:
if
hasattr
(
other
,
"path"
):
other
=
cast
(
SymbolicReference
,
other
)
return
self
.
path
==
other
.
path
return
False
def
__ne__
(
self
,
other
:
object
)
->
bool
:
return
not
(
self
==
other
)
def
__hash__
(
self
)
->
int
:
return
hash
(
self
.
path
)
@
property
def
name
(
self
)
->
str
:
"""
:return:
In case of symbolic references, the shortest assumable name is the path
itself.
"""
return
os
.
fspath
(
self
.
path
)
@
property
def
abspath
(
self
)
->
PathLike
:
return
join_path_native
(
_git_dir
(
self
.
repo
,
self
.
path
),
self
.
path
)
@
staticmethod
def
_get_validated_path
(
base
:
PathLike
,
path
:
PathLike
)
->
str
:
path
=
os
.
fspath
(
path
)
base_path
=
os
.
path
.
realpath
(
os
.
fspath
(
base
))
abs_path
=
os
.
path
.
realpath
(
os
.
path
.
join
(
base_path
,
path
))
try
:
common_path
=
os
.
path
.
commonpath
([
base_path
,
abs_path
])
except
ValueError
as
e
:
raise
ValueError
(
"Reference path %r escapes the repository"
%
path
)
from
e
if
common_path
!=
base_path
:
raise
ValueError
(
"Reference path %r escapes the repository"
%
path
)
return
abs_path
@
classmethod
def
_get_validated_ref_path
(
cls
,
repo
:
"Repo"
,
path
:
PathLike
)
->
str
:
"""Return the absolute filesystem path for a ref after validating it."""
cls
.
_check_ref_name_valid
(
path
)
ref_path
=
os
.
fspath
(
path
)
return
cls
.
_get_validated_path
(
_git_dir
(
repo
,
ref_path
),
ref_path
)
@
classmethod
def
_get_validated_reflog_path
(
cls
,
repo
:
"Repo"
,
path
:
PathLike
)
->
str
:
"""Return the absolute filesystem path for a reflog after validating it."""
cls
.
_check_ref_name_valid
(
path
)
return
cls
.
_get_validated_path
(
os
.
path
.
join
(
repo
.
git_dir
,
"logs"
),
path
)
@
classmethod
def
_get_packed_refs_path
(
cls
,
repo
:
"Repo"
)
->
str
:
return
os
.
path
.
join
(
repo
.
common_dir
,
"packed-refs"
)
@
classmethod
def
_iter_packed_refs
(
cls
,
repo
:
"Repo"
)
->
Iterator
[
Tuple
[
str
,
str
]]:
"""Return an iterator yielding pairs of sha1/path pairs (as strings) for the
corresponding refs.
:note:
The packed refs file will be kept open as long as we iterate.
"""
try
:
with
open
(
cls
.
_get_packed_refs_path
(
repo
),
"rt"
,
encoding
=
"UTF-8"
)
as
fp
:
for
line
in
fp
:
line
=
line
.
strip
()
if
not
line
:
continue
if
line
.
startswith
(
"#"
):
# "# pack-refs with: peeled fully-peeled sorted"
# the git source code shows "peeled",
# "fully-peeled" and "sorted" as the keywords
# that can go on this line, as per comments in git file
# refs/packed-backend.c
# I looked at master on 2017-10-11,
# commit 111ef79afe, after tag v2.15.0-rc1
# from repo https://github.com/git/git.git
if
line
.
startswith
(
"# pack-refs with:"
)
and
"peeled"
not
in
line
:
raise
TypeError
(
"PackingType of packed-Refs not understood: %r"
%
line
)
# END abort if we do not understand the packing scheme
continue
# END parse comment
# Skip dereferenced tag object entries - previous line was actual
# tag reference for it.
if
line
[
0
]
==
"^"
:
continue
yield
cast
(
Tuple
[
str
,
str
],
tuple
(
line
.
split
(
" "
,
1
)))
# END for each line
except
OSError
:
return
None
# END no packed-refs file handling
@
classmethod
def
dereference_recursive
(
cls
,
repo
:
"Repo"
,
ref_path
:
Union
[
PathLike
,
None
])
->
str
:
"""
:return:
hexsha stored in the reference at the given `ref_path`, recursively
dereferencing all intermediate references as required
:param repo:
The repository containing the reference at `ref_path`.
:raise ValueError:
If the reference is missing, invalid, or exceeds Git's limit of five
references in a symbolic reference chain (including the terminal ref).
"""
for
_
in
range
(
cls
.
_max_symref_depth
):
hexsha
,
ref_path
=
cls
.
_get_ref_info
(
repo
,
ref_path
)
if
hexsha
is
not
None
:
return
hexsha
# END recursive dereferencing
raise
ValueError
(
"Too many levels of symbolic references at %r"
%
ref_path
)
@
staticmethod
def
_check_ref_name_valid
(
ref_path
:
PathLike
)
->
None
:
"""Check a ref name for validity.
This is based on the rules described in :manpage:`git-check-ref-format(1)`.
"""
previous
:
Union
[
str
,
None
]
=
None
one_before_previous
:
Union
[
str
,
None
]
=
None
for
c
in
os
.
fspath
(
ref_path
):
if
c
in
" ~^:?*[
\\
"
:
raise
ValueError
(
f"Invalid reference '
{
ref_path
}
': references cannot contain spaces, tildes (~), carets (^),"
f" colons (:), question marks (?), asterisks (*), open brackets ([) or backslashes (
\\
)"
)
elif
c
==
"."
:
if
previous
is
None
or
previous
==
"/"
:
raise
ValueError
(
f"Invalid reference '
{
ref_path
}
': references cannot start with a period (.) or contain '/.'"
)
elif
previous
==
"."
:
raise
ValueError
(
f"Invalid reference '
{
ref_path
}
': references cannot contain '..'"
)
elif
c
==
"/"
:
if
previous
==
"/"
:
raise
ValueError
(
f"Invalid reference '
{
ref_path
}
': references cannot contain '//'"
)
elif
previous
is
None
:
raise
ValueError
(
f"Invalid reference '
{
ref_path
}
': references cannot start with forward slashes '/'"
)
elif
c
==
"{"
and
previous
==
"@"
:
raise
ValueError
(
f"Invalid reference '
{
ref_path
}
': references cannot contain '@{{'"
)
elif
ord
(
c
)
<
32
or
ord
(
c
)
==
127
:
raise
ValueError
(
f"Invalid reference '
{
ref_path
}
': references cannot contain ASCII control characters"
)
one_before_previous
=
previous
previous
=
c
if
previous
==
"."
:
raise
ValueError
(
f"Invalid reference '
{
ref_path
}
': references cannot end with a period (.)"
)
elif
previous
==
"/"
:
raise
ValueError
(
f"Invalid reference '
{
ref_path
}
': references cannot end with a forward slash (/)"
)
elif
previous
==
"@"
and
one_before_previous
is
None
:
raise
ValueError
(
f"Invalid reference '
{
ref_path
}
': references cannot be '@'"
)
elif
any
(
component
.
endswith
(
".lock"
)
for
component
in
Path
(
ref_path
).
parts
):
raise
ValueError
(
f"Invalid reference '
{
ref_path
}
': references cannot have slash-separated components that end with"
" '.lock'"
)
@
classmethod
def
_get_ref_info_helper
(
cls
,
repo
:
"Repo"
,
ref_path
:
Union
[
PathLike
,
None
]
)
->
Union
[
Tuple
[
str
,
None
],
Tuple
[
None
,
str
]]:
"""
:return:
*(str(sha), str(target_ref_path))*, where:
* *sha* is of the file at rela_path points to if available, or ``None``.
* *target_ref_path* is the reference we point to, or ``None``.
"""
if
ref_path
is
None
:
raise
ValueError
(
"Reference at %r does not exist"
%
ref_path
)
ref_file
=
cls
.
_get_validated_ref_path
(
repo
,
ref_path
)
tokens
:
Union
[
None
,
List
[
str
],
Tuple
[
str
,
str
]]
=
None
try
:
with
open
(
ref_file
,
"rt"
,
encoding
=
"UTF-8"
)
as
fp
:
value
=
fp
.
read
().
rstrip
()
# Don't only split on spaces, but on whitespace, which allows to parse lines like:
# 60b64ef992065e2600bfef6187a97f92398a9144 branch 'master' of git-server:/path/to/repo
tokens
=
value
.
split
()
assert
len
(
tokens
)
!=
0
except
OSError
:
# Probably we are just packed. Find our entry in the packed refs file.
# NOTE: We are not a symbolic ref if we are in a packed file, as these
# are excluded explicitly.
for
sha
,
path
in
cls
.
_iter_packed_refs
(
repo
):
if
path
!=
ref_path
:
continue
# sha will be used.
tokens
=
sha
,
path
break
# END for each packed ref
# END handle packed refs
if
tokens
is
None
:
raise
ValueError
(
"Reference at %r does not exist"
%
ref_path
)
# Is it a reference?
if
tokens
[
0
]
==
"ref:"
:
return
(
None
,
tokens
[
1
])
# It's a commit.
if
repo
.
re_hexsha_only
.
match
(
tokens
[
0
]):
return
(
tokens
[
0
],
None
)
raise
ValueError
(
"Failed to parse reference information from %r"
%
ref_path
)
@
classmethod
def
_get_ref_info
(
cls
,
repo
:
"Repo"
,
ref_path
:
Union
[
PathLike
,
None
])
->
Union
[
Tuple
[
str
,
None
],
Tuple
[
None
,
str
]]:
"""
:return:
*(str(sha), str(target_ref_path))*, where:
* *sha* is of the file at rela_path points to if available, or ``None``.
* *target_ref_path* is the reference we point to, or ``None``.
"""
return
cls
.
_get_ref_info_helper
(
repo
,
ref_path
)
def
_get_object
(
self
)
->
AnyGitObject
:
"""
:return:
The object our ref currently refers to. Refs can be cached, they will always
point to the actual object as it gets re-created on each query.
"""
# We have to be dynamic here as we may be a tag which can point to anything.
# Our path will be resolved to the hexsha which will be used accordingly.
return
Object
.
new_from_sha
(
self
.
repo
,
hex_to_bin
(
self
.
dereference_recursive
(
self
.
repo
,
self
.
path
)))
def
_get_commit
(
self
)
->
"Commit"
:
"""
:return:
:class:`~git.objects.commit.Commit` object we point to. This works for
detached and non-detached :class:`SymbolicReference` instances. The symbolic
reference will be dereferenced recursively.
"""
obj
=
self
.
_get_object
()
if
obj
.
type
==
"tag"
:
obj
=
obj
.
object
# END dereference tag
if
obj
.
type
!=
Commit
.
type
:
raise
TypeError
(
"Symbolic Reference pointed to object %r, commit was required"
%
obj
)
# END handle type
return
obj
def
set_commit
(
self
,
commit
:
Union
[
Commit
,
"SymbolicReference"
,
str
],
logmsg
:
Union
[
str
,
None
]
=
None
,
)
->
"SymbolicReference"
:
"""Like :meth:`set_object`, but restricts the type of object to be a
:class:`~git.objects.commit.Commit`.
:raise ValueError:
If `commit` is not a :class:`~git.objects.commit.Commit` object, nor does it
point to a commit.
:return:
self
"""
# Check the type - assume the best if it is a base-string.
invalid_type
=
False
if
isinstance
(
commit
,
Object
):
invalid_type
=
commit
.
type
!=
Commit
.
type
elif
isinstance
(
commit
,
SymbolicReference
):
invalid_type
=
commit
.
object
.
type
!=
Commit
.
type
else
:
try
:
invalid_type
=
self
.
repo
.
rev_parse
(
commit
).
type
!=
Commit
.
type
except
(
BadObject
,
BadName
)
as
e
:
raise
ValueError
(
"Invalid object: %s"
%
commit
)
from
e
# END handle exception
# END verify type
if
invalid_type
:
raise
ValueError
(
"Need commit, got %r"
%
commit
)
# END handle raise
# We leave strings to the rev-parse method below.
self
.
set_object
(
commit
,
logmsg
)
return
self
def
set_object
(
self
,
object
:
Union
[
AnyGitObject
,
"SymbolicReference"
,
str
],
logmsg
:
Union
[
str
,
None
]
=
None
,
)
->
"SymbolicReference"
:
"""Set the object we point to, possibly dereference our symbolic reference
first. If the reference does not exist, it will be created.
:param object:
A refspec, a :class:`SymbolicReference` or an
:class:`~git.objects.base.Object` instance.
* :class:`SymbolicReference` instances will be dereferenced beforehand to
obtain the git object they point to.
* :class:`~git.objects.base.Object` instances must represent git objects
(:class:`~git.types.AnyGitObject`).
:param logmsg:
If not ``None``, the message will be used in the reflog entry to be written.
Otherwise the reflog is not altered.
:note:
Plain :class:`SymbolicReference` instances may not actually point to objects
by convention.
:return:
self
:raise ValueError:
If the symbolic reference chain exceeds Git's limit of five references.
"""
# Validate before recursing through the public method, preserving subclass
# dispatch and Reference's HEAD reflog updates.
ref_path
:
Union
[
PathLike
,
None
]
=
self
.
path
for
_
in
range
(
self
.
_max_symref_depth
):
try
:
hexsha
,
ref_path
=
self
.
_get_ref_info
(
self
.
repo
,
ref_path
)
except
ValueError
:
break
# Allow creating an unborn terminal reference.
if
hexsha
is
not
None
:
break
else
:
raise
ValueError
(
"Too many levels of symbolic references at %r"
%
ref_path
)
if
isinstance
(
object
,
SymbolicReference
):
object
=
object
.
object
# @ReservedAssignment
# END resolve references
is_detached
=
True
try
:
is_detached
=
self
.
is_detached
except
ValueError
:
pass
# END handle non-existing ones
if
is_detached
:
return
self
.
set_reference
(
object
,
logmsg
)
# set the commit on our reference
return
self
.
_get_reference
().
set_object
(
object
,
logmsg
)
@
property
def
commit
(
self
)
->
"Commit"
:
"""The commit this reference resolves to, whether detached or symbolic.
For example, ``repo.head.commit.hexsha`` returns the current commit ID
both on a branch and with a detached HEAD. HEAD must resolve to an
existing commit; an unborn branch in an empty repository has none.
Assigning updates the commit without changing whether this reference
is detached.
"""
return
self
.
_get_commit
()
@
commit
.
setter
def
commit
(
self
,
commit
:
Union
[
Commit
,
"SymbolicReference"
,
str
])
->
"SymbolicReference"
:
return
self
.
set_commit
(
commit
)
@
property
def
object
(
self
)
->
AnyGitObject
:
"""Return the object our ref currently refers to"""
return
self
.
_get_object
()
@
object
.
setter
def
object
(
self
,
object
:
Union
[
AnyGitObject
,
"SymbolicReference"
,
str
])
->
"SymbolicReference"
:
return
self
.
set_object
(
object
)
def
_get_reference
(
self
)
->
"Reference"
:
"""
:return:
:class:`~git.refs.reference.Reference` object we point to
:raise TypeError:
If this symbolic reference is detached, hence it doesn't point to a
reference, but to a commit.
"""
sha
,
target_ref_path
=
self
.
_get_ref_info
(
self
.
repo
,
self
.
path
)
if
target_ref_path
is
None
:
raise
TypeError
(
"%s is a detached symbolic reference as it points to %r. "
"Use .commit or .object to access the target directly."
%
(
self
,
sha
)
)
return
cast
(
"Reference"
,
self
.
from_path
(
self
.
repo
,
target_ref_path
))
def
set_reference
(
self
,
ref
:
Union
[
AnyGitObject
,
"SymbolicReference"
,
str
],
logmsg
:
Union
[
str
,
None
]
=
None
,
)
->
"SymbolicReference"
:
"""Set ourselves to the given `ref`.
It will stay a symbol if the `ref` is a :class:`~git.refs.reference.Reference`.
Otherwise a git object, specified as a :class:`~git.objects.base.Object`
instance or refspec, is assumed. If it is valid, this reference will be set to
it, which effectively detaches the reference if it was a purely symbolic one.
:param ref:
A :class:`SymbolicReference` instance, an :class:`~git.objects.base.Object`
instance (specifically an :class:`~git.types.AnyGitObject`), or a refspec
string. Only if the ref is a :class:`SymbolicReference` instance, we will
point to it. Everything else is dereferenced to obtain the actual object.
:param logmsg:
If set to a string, the message will be used in the reflog.
Otherwise, a reflog entry is not written for the changed reference.
The previous commit of the entry will be the commit we point to now.
See also: :meth:`log_append`
:return:
self
:note:
This symbolic reference will not be dereferenced. For that, see
:meth:`set_object`.
"""
write_value
=
None
obj
=
None
if
isinstance
(
ref
,
SymbolicReference
):
write_value
=
"ref: %s"
%
ref
.
path
elif
isinstance
(
ref
,
Object
):
obj
=
ref
write_value
=
ref
.
hexsha
elif
isinstance
(
ref
,
str
):
try
:
obj
=
self
.
repo
.
rev_parse
(
ref
+
"^{}"
)
# Optionally dereference tags.
write_value
=
obj
.
hexsha
except
(
BadObject
,
BadName
)
as
e
:
raise
ValueError
(
"Could not extract object from %s"
%
ref
)
from
e
# END end try string
else
:
raise
ValueError
(
"Unrecognized Value: %r"
%
ref
)
# END try commit attribute
# typecheck
if
obj
is
not
None
and
self
.
_points_to_commits_only
and
obj
.
type
!=
Commit
.
type
:
raise
TypeError
(
"Require commit, got %r"
%
obj
)
# END verify type
oldbinsha
:
bytes
=
b""
if
logmsg
is
not
None
:
try
:
oldbinsha
=
self
.
commit
.
binsha
except
ValueError
:
oldbinsha
=
Commit
.
NULL_BIN_SHA
# END handle non-existing
# END retrieve old hexsha
fpath
=
self
.
_get_validated_ref_path
(
self
.
repo
,
self
.
path
)
assure_directory_exists
(
fpath
,
is_file
=
True
)
lfd
=
LockedFD
(
fpath
)
fd
=
lfd
.
open
(
write
=
True
,
stream
=
True
)
try
:
fd
.
write
(
write_value
.
encode
(
"utf-8"
)
+
b"
\n
"
)
lfd
.
commit
()
except
BaseException
:
lfd
.
rollback
()
raise
# Adjust the reflog
if
logmsg
is
not
None
:
self
.
log_append
(
oldbinsha
,
logmsg
)
return
self
# Aliased reference
@
property
def
reference
(
self
)
->
"Reference"
:
"""The reference we point to, available only when not detached.
Check :attr:`is_detached` before reading this property if a target
reference is required. To access the target commit or object in either
state, use :attr:`commit` or :attr:`object` instead.
Assigning a reference keeps this reference symbolic. Assigning a git
object or revision string detaches it; reading this property then raises.
:raise TypeError:
If this reference is detached when reading the property.
"""
return
self
.
_get_reference
()
@
reference
.
setter
def
reference
(
self
,
ref
:
Union
[
AnyGitObject
,
"SymbolicReference"
,
str
])
->
"SymbolicReference"
:
return
self
.
set_reference
(
ref
)
ref
=
reference
def
is_valid
(
self
)
->
bool
:
"""
:return:
``True`` if the reference is valid, hence it can be read and points to a
valid object or reference.
"""
try
:
self
.
object
# noqa: B018
except
(
OSError
,
ValueError
):
return
False
else
:
return
True
@
property
def
is_detached
(
self
)
->
bool
:
"""
:return:
``True`` if we are a detached reference, hence we point to a specific commit
instead to another reference.
"""
# Inspect only this ref. Constructing its target would recursively inspect
# symbolic references with nonstandard names through from_path().
return
self
.
_get_ref_info
(
self
.
repo
,
self
.
path
)[
1
]
is
None
def
log
(
self
)
->
"RefLog"
:
"""
:return:
:class:`~git.refs.log.RefLog` for this reference.
Its last entry reflects the latest change applied to this reference.
:note:
As the log is parsed every time, its recommended to cache it for use instead
of calling this method repeatedly. It should be considered read-only.
"""
return
RefLog
.
from_file
(
RefLog
.
path
(
self
))
def
log_append
(
self
,
oldbinsha
:
bytes
,
message
:
Union
[
str
,
None
],
newbinsha
:
Union
[
bytes
,
None
]
=
None
,
)
->
"RefLogEntry"
:
"""Append a logentry to the logfile of this ref.
:param oldbinsha:
Binary sha this ref used to point to.
:param message:
A message describing the change.
:param newbinsha:
The sha the ref points to now. If None, our current commit sha will be used.
:return:
The added :class:`~git.refs.log.RefLogEntry` instance.
"""
# NOTE: We use the committer of the currently active commit - this should be
# correct to allow overriding the committer on a per-commit level.
# See https://github.com/gitpython-developers/GitPython/pull/146.
try
:
committer_or_reader
:
Union
[
"Actor"
,
"GitConfigParser"
]
=
self
.
commit
.
committer
except
ValueError
:
committer_or_reader
=
self
.
repo
.
config_reader
()
# END handle newly cloned repositories
if
newbinsha
is
None
:
newbinsha
=
self
.
commit
.
binsha
if
message
is
None
:
message
=
""
return
RefLog
.
append_entry
(
committer_or_reader
,
RefLog
.
path
(
self
),
oldbinsha
,
newbinsha
,
message
)
def
log_entry
(
self
,
index
:
int
)
->
"RefLogEntry"
:
"""
:return:
:class:`~git.refs.log.RefLogEntry` at the given index
:param index:
Python list compatible positive or negative index.
:note:
This method must read part of the reflog during execution, hence it should
be used sparingly, or only if you need just one index. In that case, it will
be faster than the :meth:`log` method.
"""
return
RefLog
.
entry_at
(
RefLog
.
path
(
self
),
index
)
@
classmethod
def
to_full_path
(
cls
,
path
:
Union
[
PathLike
,
"SymbolicReference"
])
->
PathLike
:
"""
:return:
String with a full repository-relative path which can be used to initialize
a :class:`~git.refs.reference.Reference` instance, for instance by using
:meth:`Reference.from_path <git.refs.reference.Reference.from_path>`.
"""
if
isinstance
(
path
,
SymbolicReference
):
path
=
path
.
path
full_ref_path
=
path
if
not
cls
.
_common_path_default
:
return
full_ref_path
if
not
os
.
fspath
(
path
).
startswith
(
cls
.
_common_path_default
+
"/"
):
full_ref_path
=
"%s/%s"
%
(
cls
.
_common_path_default
,
path
)
return
full_ref_path
@
classmethod
def
delete
(
cls
,
repo
:
"Repo"
,
path
:
PathLike
)
->
None
:
"""Delete the reference at the given path.
:param repo:
Repository to delete the reference from.
:param path:
Short or full path pointing to the reference, e.g. ``refs/myreference`` or
just ``myreference``, hence ``refs/`` is implied.
Alternatively the symbolic reference to be deleted.
"""
full_ref_path
=
cls
.
to_full_path
(
path
)
abs_path
=
cls
.
_get_validated_ref_path
(
repo
,
full_ref_path
)
if
os
.
path
.
exists
(
abs_path
):
os
.
remove
(
abs_path
)
else
:
# Check packed refs.
pack_file_path
=
cls
.
_get_packed_refs_path
(
repo
)
try
:
with
open
(
pack_file_path
,
"rb"
)
as
reader
:
new_lines
=
[]
made_change
=
False
dropped_last_line
=
False
for
line_bytes
in
reader
:
line
=
line_bytes
.
decode
(
defenc
)
_
,
_
,
line_ref
=
line
.
partition
(
" "
)
line_ref
=
line_ref
.
strip
()
# Keep line if it is a comment or if the ref to delete is not in
# the line.
# If we deleted the last line and this one is a tag-reference
# object, we drop it as well.
if
(
line
.
startswith
(
"#"
)
or
full_ref_path
!=
line_ref
)
and
(
not
dropped_last_line
or
dropped_last_line
and
not
line
.
startswith
(
"^"
)
):
new_lines
.
append
(
line
)
dropped_last_line
=
False
continue
# END skip comments and lines without our path
# Drop this line.
made_change
=
True
dropped_last_line
=
True
# Write the new lines.
if
made_change
:
# Binary writing is required, otherwise Windows will open the file
# in text mode and change LF to CRLF!
with
open
(
pack_file_path
,
"wb"
)
as
fd
:
fd
.
writelines
(
line
.
encode
(
defenc
)
for
line
in
new_lines
)
except
OSError
:
pass
# It didn't exist at all.
# Delete the reflog.
reflog_path
=
RefLog
.
path
(
cls
(
repo
,
full_ref_path
))
if
os
.
path
.
isfile
(
reflog_path
):
os
.
remove
(
reflog_path
)
# END remove reflog
@
classmethod
def
_create
(
cls
:
Type
[
T_References
],
repo
:
"Repo"
,
path
:
PathLike
,
resolve
:
bool
,
reference
:
Union
[
"SymbolicReference"
,
str
],
force
:
bool
,
logmsg
:
Union
[
str
,
None
]
=
None
,
)
->
T_References
:
"""Internal method used to create a new symbolic reference.
If `resolve` is ``False``, the reference will be taken as is, creating a proper
symbolic reference. Otherwise it will be resolved to the corresponding object
and a detached symbolic reference will be created instead.
"""
full_ref_path
=
cls
.
to_full_path
(
path
)
abs_ref_path
=
cls
.
_get_validated_ref_path
(
repo
,
full_ref_path
)
# Figure out target data.
target
=
reference
if
resolve
:
target
=
repo
.
rev_parse
(
str
(
reference
))
if
not
force
and
os
.
path
.
isfile
(
abs_ref_path
):
target_data
=
str
(
target
)
if
isinstance
(
target
,
SymbolicReference
):
target_data
=
os
.
fspath
(
target
.
path
)
if
not
resolve
:
target_data
=
"ref: "
+
target_data
with
open
(
abs_ref_path
,
"rb"
)
as
fd
:
existing_data
=
fd
.
read
().
decode
(
defenc
).
strip
()
if
existing_data
!=
target_data
:
raise
OSError
(
"Reference at %r does already exist, pointing to %r, requested was %r"
%
(
full_ref_path
,
existing_data
,
target_data
)
)
# END no force handling
ref
=
cls
(
repo
,
full_ref_path
)
ref
.
set_reference
(
target
,
logmsg
)
return
ref
@
classmethod
def
create
(
cls
:
Type
[
T_References
],
repo
:
"Repo"
,
path
:
PathLike
,
reference
:
Union
[
"SymbolicReference"
,
str
]
=
"HEAD"
,
logmsg
:
Union
[
str
,
None
]
=
None
,
force
:
bool
=
False
,
**
kwargs
:
Any
,
)
->
T_References
:
"""Create a new symbolic reference: a reference pointing to another reference.
:param repo:
Repository to create the reference in.
:param path:
Full path at which the new symbolic reference is supposed to be created at,
e.g. ``NEW_HEAD`` or ``symrefs/my_new_symref``.
:param reference:
The reference which the new symbolic reference should point to.
If it is a commit-ish, the symbolic ref will be detached.
:param force:
If ``True``, force creation even if a symbolic reference with that name
already exists. Raise :exc:`OSError` otherwise.
:param logmsg:
If not ``None``, the message to append to the reflog.
If ``None``, no reflog entry is written.
:return:
Newly created symbolic reference
:raise OSError:
If a (Symbolic)Reference with the same name but different contents already
exists.
:note:
This does not alter the current HEAD, index or working tree.
"""
return
cls
.
_create
(
repo
,
path
,
cls
.
_resolve_ref_on_create
,
reference
,
force
,
logmsg
)
def
rename
(
self
,
new_path
:
PathLike
,
force
:
bool
=
False
)
->
"SymbolicReference"
:
"""Rename self to a new path.
:param new_path:
Either a simple name or a full path, e.g. ``new_name`` or
``features/new_name``.
The prefix ``refs/`` is implied for references and will be set as needed.
In case this is a symbolic ref, there is no implied prefix.
:param force:
If ``True``, the rename will succeed even if a head with the target name
already exists. It will be overwritten in that case.
:return:
self
:raise OSError:
If a file at path but with different contents already exists.
"""
new_path
=
self
.
to_full_path
(
new_path
)
if
self
.
path
==
new_path
:
return
self
new_abs_path
=
self
.
_get_validated_ref_path
(
self
.
repo
,
new_path
)
cur_abs_path
=
self
.
_get_validated_ref_path
(
self
.
repo
,
self
.
path
)
if
os
.
path
.
isfile
(
new_abs_path
):
if
not
force
:
# If they point to the same file, it's not an error.
with
open
(
new_abs_path
,
"rb"
)
as
fd1
:
f1
=
fd1
.
read
().
strip
()
with
open
(
cur_abs_path
,
"rb"
)
as
fd2
:
f2
=
fd2
.
read
().
strip
()
if
f1
!=
f2
:
raise
OSError
(
"File at path %r already exists"
%
new_abs_path
)
# else: We could remove ourselves and use the other one, but...
# ...for clarity, we just continue as usual.
# END not force handling
os
.
remove
(
new_abs_path
)
# END handle existing target file
dname
=
os
.
path
.
dirname
(
new_abs_path
)
if
not
os
.
path
.
isdir
(
dname
):
os
.
makedirs
(
dname
)
# END create directory
os
.
rename
(
cur_abs_path
,
new_abs_path
)
self
.
path
=
new_path
return
self
@
classmethod
def
_iter_items
(
cls
:
Type
[
T_References
],
repo
:
"Repo"
,
common_path
:
Union
[
PathLike
,
None
]
=
None
)
->
Iterator
[
T_References
]:
if
common_path
is
None
:
common_path
=
cls
.
_common_path_default
rela_paths
=
set
()
# Walk loose refs.
# Currently we do not follow links.
for
root
,
dirs
,
files
in
os
.
walk
(
join_path_native
(
repo
.
common_dir
,
common_path
)):
if
"refs"
not
in
root
.
split
(
os
.
sep
):
# Skip non-refs subfolders.
refs_id
=
[
d
for
d
in
dirs
if
d
==
"refs"
]
if
refs_id
:
dirs
[
0
:]
=
[
"refs"
]
# END prune non-refs folders
for
f
in
files
:
if
f
==
"packed-refs"
:
continue
abs_path
=
to_native_path_linux
(
join_path
(
root
,
f
))
rela_paths
.
add
(
abs_path
.
replace
(
to_native_path_linux
(
repo
.
common_dir
)
+
"/"
,
""
))
# END for each file in root directory
# END for each directory to walk
# Read packed refs.
for
_sha
,
rela_path
in
cls
.
_iter_packed_refs
(
repo
):
if
rela_path
.
startswith
(
os
.
fspath
(
common_path
)):
rela_paths
.
add
(
rela_path
)
# END relative path matches common path
# END packed refs reading
# Yield paths in sorted order.
for
path
in
sorted
(
rela_paths
):
try
:
yield
cls
.
from_path
(
repo
,
path
)
except
ValueError
:
continue
# END for each sorted relative refpath
@
classmethod
def
iter_items
(
cls
:
Type
[
T_References
],
repo
:
"Repo"
,
common_path
:
Union
[
PathLike
,
None
]
=
None
,
*
args
:
Any
,
**
kwargs
:
Any
,
)
->
Iterator
[
T_References
]:
"""Find all refs in the repository.
:param repo:
The :class:`~git.repo.base.Repo`.
:param common_path:
Optional keyword argument to the path which is to be shared by all returned
Ref objects.
Defaults to class specific portion if ``None``, ensuring that only refs
suitable for the actual class are returned.
:return:
A list of :class:`SymbolicReference`, each guaranteed to be a symbolic ref
which is not detached and pointing to a valid ref.
The list is lexicographically sorted. The returned objects are instances of
concrete subclasses, such as :class:`~git.refs.head.Head` or
:class:`~git.refs.tag.TagReference`.
"""
return
(
r
for
r
in
cls
.
_iter_items
(
repo
,
common_path
)
if
r
.
__class__
is
SymbolicReference
or
not
r
.
is_detached
)
@
classmethod
def
from_path
(
cls
:
Type
[
T_References
],
repo
:
"Repo"
,
path
:
PathLike
)
->
T_References
:
"""Make a symbolic reference from a path.
:param path:
Full ``.git``-directory-relative path name to the Reference to instantiate.
:note:
Use :meth:`to_full_path` if you only have a partial path of a known
Reference type.
:return:
Instance of type :class:`~git.refs.reference.Reference`,
:class:`~git.refs.head.Head`, or :class:`~git.refs.tag.Tag`, depending on
the given path.
"""
if
not
path
:
raise
ValueError
(
"Cannot create Reference from %r"
%
path
)
# Names like HEAD are inserted after the refs module is imported - we have an
# import dependency cycle and don't want to import these names in-function.
from
.
import
HEAD
,
Head
,
RemoteReference
,
TagReference
,
Reference
for
ref_type
in
(
HEAD
,
Head
,
RemoteReference
,
TagReference
,
Reference
,
SymbolicReference
,
):
try
:
instance
=
cast
(
T_References
,
ref_type
(
repo
,
path
))
if
instance
.
__class__
is
SymbolicReference
and
instance
.
is_detached
:
raise
ValueError
(
"SymbolicRef was detached, we drop it"
)
else
:
return
instance
except
ValueError
:
pass
# END exception handling
# END for each type to try
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