-
Notifications
You must be signed in to change notification settings - Fork 0
/
git-check-ref-format.txt
140 lines (111 loc) · 4.92 KB
/
git-check-ref-format.txt
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
git-check-ref-format(1)
=======================
NAME
----
git-check-ref-format - Ensures that a reference name is well formed
SYNOPSIS
--------
[verse]
'git check-ref-format' [--normalize]
[--[no-]allow-onelevel] [--refspec-pattern]
<refname>
'git check-ref-format' --branch <branchname-shorthand>
DESCRIPTION
-----------
Checks if a given 'refname' is acceptable, and exits with a non-zero
status if it is not.
A reference is used in Git to specify branches and tags. A
branch head is stored in the `refs/heads` hierarchy, while
a tag is stored in the `refs/tags` hierarchy of the ref namespace
(typically in `$GIT_DIR/refs/heads` and `$GIT_DIR/refs/tags`
directories or, as entries in file `$GIT_DIR/packed-refs`
if refs are packed by `git gc`).
Git imposes the following rules on how references are named:
. They can include slash `/` for hierarchical (directory)
grouping, but no slash-separated component can begin with a
dot `.` or end with the sequence `.lock`.
. They must contain at least one `/`. This enforces the presence of a
category like `heads/`, `tags/` etc. but the actual names are not
restricted. If the `--allow-onelevel` option is used, this rule
is waived.
. They cannot have two consecutive dots `..` anywhere.
. They cannot have ASCII control characters (i.e. bytes whose
values are lower than \040, or \177 `DEL`), space, tilde `~`,
caret `^`, or colon `:` anywhere.
. They cannot have question-mark `?`, asterisk `*`, or open
bracket `[` anywhere. See the `--refspec-pattern` option below for
an exception to this rule.
. They cannot begin or end with a slash `/` or contain multiple
consecutive slashes (see the `--normalize` option below for an
exception to this rule).
. They cannot end with a dot `.`.
. They cannot contain a sequence `@{`.
. They cannot be the single character `@`.
. They cannot contain a `\`.
These rules make it easy for shell script based tools to parse
reference names, pathname expansion by the shell when a reference name is used
unquoted (by mistake), and also avoid ambiguities in certain
reference name expressions (see linkgit:gitrevisions[7]):
. A double-dot `..` is often used as in `ref1..ref2`, and in some
contexts this notation means `^ref1 ref2` (i.e. not in
`ref1` and in `ref2`).
. A tilde `~` and caret `^` are used to introduce the postfix
'nth parent' and 'peel onion' operation.
. A colon `:` is used as in `srcref:dstref` to mean "use srcref\'s
value and store it in dstref" in fetch and push operations.
It may also be used to select a specific object such as with
'git cat-file': "git cat-file blob v1.3.3:refs.c".
. at-open-brace `@{` is used as a notation to access a reflog entry.
With the `--branch` option, the command takes a name and checks if
it can be used as a valid branch name (e.g. when creating a new
branch). But be cautious when using the
previous checkout syntax that may refer to a detached HEAD state.
The rule `git check-ref-format --branch $name` implements
may be stricter than what `git check-ref-format refs/heads/$name`
says (e.g. a dash may appear at the beginning of a ref component,
but it is explicitly forbidden at the beginning of a branch name).
When run with the `--branch` option in a repository, the input is first
expanded for the ``previous checkout syntax''
`@{-n}`. For example, `@{-1}` is a way to refer the last thing that
was checked out using "git switch" or "git checkout" operation.
This option should be
used by porcelains to accept this syntax anywhere a branch name is
expected, so they can act as if you typed the branch name. As an
exception note that, the ``previous checkout operation'' might result
in a commit object name when the N-th last thing checked out was not
a branch.
OPTIONS
-------
--[no-]allow-onelevel::
Controls whether one-level refnames are accepted (i.e.,
refnames that do not contain multiple `/`-separated
components). The default is `--no-allow-onelevel`.
--refspec-pattern::
Interpret <refname> as a reference name pattern for a refspec
(as used with remote repositories). If this option is
enabled, <refname> is allowed to contain a single `*`
in the refspec (e.g., `foo/bar*/baz` or `foo/bar*baz/`
but not `foo/bar*/baz*`).
--normalize::
Normalize 'refname' by removing any leading slash (`/`)
characters and collapsing runs of adjacent slashes between
name components into a single slash. If the normalized
refname is valid then print it to standard output and exit
with a status of 0, otherwise exit with a non-zero status.
(`--print` is a deprecated way to spell `--normalize`.)
EXAMPLES
--------
* Print the name of the previous thing checked out:
+
------------
$ git check-ref-format --branch @{-1}
------------
* Determine the reference name to use for a new branch:
+
------------
$ ref=$(git check-ref-format --normalize "refs/heads/$newbranch")||
{ echo "we do not like '$newbranch' as a branch name." >&2 ; exit 1 ; }
------------
GIT
---
Part of the linkgit:git[1] suite