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https://github.com/git/git
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79 lines
2.4 KiB
Text
79 lines
2.4 KiB
Text
git-check-ref-format(1)
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=======================
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NAME
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----
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git-check-ref-format - Ensures that a reference name is well formed
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SYNOPSIS
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--------
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[verse]
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'git check-ref-format' <refname>
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'git check-ref-format' [--branch] <branchname-shorthand>
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DESCRIPTION
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-----------
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Checks if a given 'refname' is acceptable, and exits with a non-zero
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status if it is not.
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A reference is used in git to specify branches and tags. A
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branch head is stored under the `$GIT_DIR/refs/heads` directory, and
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a tag is stored under the `$GIT_DIR/refs/tags` directory. git
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imposes the following rules on how references are named:
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. They can include slash `/` for hierarchical (directory)
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grouping, but no slash-separated component can begin with a
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dot `.`.
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. They must contain at least one `/`. This enforces the presence of a
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category like `heads/`, `tags/` etc. but the actual names are not
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restricted.
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. They cannot have two consecutive dots `..` anywhere.
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. They cannot have ASCII control characters (i.e. bytes whose
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values are lower than \040, or \177 `DEL`), space, tilde `~`,
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caret `{caret}`, colon `:`, question-mark `?`, asterisk `*`,
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or open bracket `[` anywhere.
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. They cannot end with a slash `/` nor a dot `.`.
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. They cannot end with the sequence `.lock`.
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. They cannot contain a sequence `@{`.
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- They cannot contain a `\\`.
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These rules make it easy for shell script based tools to parse
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reference names, pathname expansion by the shell when a reference name is used
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unquoted (by mistake), and also avoids ambiguities in certain
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reference name expressions (see linkgit:git-rev-parse[1]):
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. A double-dot `..` is often used as in `ref1..ref2`, and in some
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contexts this notation means `{caret}ref1 ref2` (i.e. not in
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`ref1` and in `ref2`).
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. A tilde `~` and caret `{caret}` are used to introduce the postfix
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'nth parent' and 'peel onion' operation.
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. A colon `:` is used as in `srcref:dstref` to mean "use srcref\'s
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value and store it in dstref" in fetch and push operations.
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It may also be used to select a specific object such as with
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'git-cat-file': "git cat-file blob v1.3.3:refs.c".
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. at-open-brace `@{` is used as a notation to access a reflog entry.
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With the `--branch` option, it expands a branch name shorthand and
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prints the name of the branch the shorthand refers to.
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EXAMPLE
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-------
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git check-ref-format --branch @{-1}::
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Print the name of the previous branch.
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GIT
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---
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Part of the linkgit:git[1] suite
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