2 .\" Title: git-check-ref-format
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10 .TH "GIT\-CHECK\-REF\-FORMAT" "1" "2023\-06\-01" "Git 2\&.41\&.0" "Git Manual"
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15 .\" http://bugs.debian.org/507673
16 .\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
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31 git-check-ref-format \- Ensures that a reference name is well formed
35 \fIgit check\-ref\-format\fR [\-\-normalize]
36 [\-\-[no\-]allow\-onelevel] [\-\-refspec\-pattern]
38 \fIgit check\-ref\-format\fR \-\-branch <branchname\-shorthand>
43 Checks if a given \fIrefname\fR is acceptable, and exits with a non\-zero status if it is not\&.
45 A reference is used in Git to specify branches and tags\&. A branch head is stored in the \fBrefs/heads\fR hierarchy, while a tag is stored in the \fBrefs/tags\fR hierarchy of the ref namespace (typically in \fB$GIT_DIR/refs/heads\fR and \fB$GIT_DIR/refs/tags\fR directories or, as entries in file \fB$GIT_DIR/packed\-refs\fR if refs are packed by \fBgit gc\fR)\&.
47 Git imposes the following rules on how references are named:
57 They can include slash
59 for hierarchical (directory) grouping, but no slash\-separated component can begin with a dot
61 or end with the sequence
73 They must contain at least one
74 \fB/\fR\&. This enforces the presence of a category like
77 etc\&. but the actual names are not restricted\&. If the
78 \fB\-\-allow\-onelevel\fR
79 option is used, this rule is waived\&.
90 They cannot have two consecutive dots
103 They cannot have ASCII control characters (i\&.e\&. bytes whose values are lower than \e040, or \e177
104 \fBDEL\fR), space, tilde
119 They cannot have question\-mark
121 \fB*\fR, or open bracket
124 \fB\-\-refspec\-pattern\fR
125 option below for an exception to this rule\&.
136 They cannot begin or end with a slash
138 or contain multiple consecutive slashes (see the
140 option below for an exception to this rule)
151 They cannot end with a dot
163 They cannot contain a sequence
175 They cannot be the single character
187 They cannot contain a
191 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 \fBgitrevisions\fR(7)):
204 \fBref1\&.\&.ref2\fR, and in some contexts this notation means
224 are used to introduce the postfix
243 to mean "use srcref\(cqs value and store it in dstref" in fetch and push operations\&. It may also be used to select a specific object such as with
244 \fIgit cat\-file\fR: "git cat\-file blob v1\&.3\&.3:refs\&.c"\&.
257 is used as a notation to access a reflog entry\&.
260 With the \fB\-\-branch\fR 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 \fBgit check\-ref\-format \-\-branch $name\fR implements may be stricter than what \fBgit check\-ref\-format refs/heads/$name\fR 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 \fB\-\-branch\fR option in a repository, the input is first expanded for the \(lqprevious checkout syntax\(rq \fB@{\-n}\fR\&. For example, \fB@{\-1}\fR 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 \(lqprevious checkout operation\(rq might result in a commit object name when the N\-th last thing checked out was not a branch\&.
263 \-\-[no\-]allow\-onelevel
265 Controls whether one\-level refnames are accepted (i\&.e\&., refnames that do not contain multiple
266 \fB/\fR\-separated components)\&. The default is
267 \fB\-\-no\-allow\-onelevel\fR\&.
272 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
274 in the refspec (e\&.g\&.,
279 \fBfoo/bar*/baz*\fR)\&.
286 by removing any leading slash (\fB/\fR) 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\&. (\fB\-\-print\fR
287 is a deprecated way to spell
288 \fB\-\-normalize\fR\&.)
300 Print the name of the previous thing checked out:
306 $ git check\-ref\-format \-\-branch @{\-1}
322 Determine the reference name to use for a new branch:
328 $ ref=$(git check\-ref\-format \-\-normalize "refs/heads/$newbranch")||
329 { echo "we do not like \*(Aq$newbranch\*(Aq as a branch name\&." >&2 ; exit 1 ; }
338 Part of the \fBgit\fR(1) suite