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GIT-TAG(1)				    Git Manual				       GIT-TAG(1)

NAME
       git-tag - Create, list, delete or verify a tag object signed with GPG

SYNOPSIS
       git tag [-a | -s | -u <key-id>] [-f] [-m <msg> | -F <file>]
	       <tagname> [<commit> | <object>]
       git tag -d <tagname>...
       git tag [-n[<num>]] -l [--contains <commit>] [--points-at <object>]
	       [--column[=<options>] | --no-column] [<pattern>...]
	       [<pattern>...]
       git tag -v <tagname>...

DESCRIPTION
       Add a tag reference in refs/tags/, unless -d/-l/-v is given to delete, list or verify
       tags.

       Unless -f is given, the named tag must not yet exist.

       If one of -a, -s, or -u <key-id> is passed, the command creates a tag object, and requires
       a tag message. Unless -m <msg> or -F <file> is given, an editor is started for the user to
       type in the tag message.

       If -m <msg> or -F <file> is given and -a, -s, and -u <key-id> are absent, -a is implied.

       Otherwise just a tag reference for the SHA-1 object name of the commit object is created
       (i.e. a lightweight tag).

       A GnuPG signed tag object will be created when -s or -u <key-id> is used. When -u <key-id>
       is not used, the committer identity for the current user is used to find the GnuPG key for
       signing. The configuration variable gpg.program is used to specify custom GnuPG binary.

OPTIONS
       -a, --annotate
	   Make an unsigned, annotated tag object

       -s, --sign
	   Make a GPG-signed tag, using the default e-mail address's key.

       -u <key-id>, --local-user=<key-id>
	   Make a GPG-signed tag, using the given key.

       -f, --force
	   Replace an existing tag with the given name (instead of failing)

       -d, --delete
	   Delete existing tags with the given names.

       -v, --verify
	   Verify the gpg signature of the given tag names.

       -n<num>
	   <num> specifies how many lines from the annotation, if any, are printed when using -l.
	   The default is not to print any annotation lines. If no number is given to -n, only
	   the first line is printed. If the tag is not annotated, the commit message is
	   displayed instead.

       -l <pattern>, --list <pattern>
	   List tags with names that match the given pattern (or all if no pattern is given).
	   Running "git tag" without arguments also lists all tags. The pattern is a shell
	   wildcard (i.e., matched using fnmatch(3)). Multiple patterns may be given; if any of
	   them matches, the tag is shown.

       --column[=<options>], --no-column
	   Display tag listing in columns. See configuration variable column.tag for option
	   syntax.--column and --no-column without options are equivalent to always and never
	   respectively.

	   This option is only applicable when listing tags without annotation lines.

       --contains <commit>
	   Only list tags which contain the specified commit.

       --points-at <object>
	   Only list tags of the given object.

       -m <msg>, --message=<msg>
	   Use the given tag message (instead of prompting). If multiple -m options are given,
	   their values are concatenated as separate paragraphs. Implies -a if none of -a, -s, or
	   -u <key-id> is given.

       -F <file>, --file=<file>
	   Take the tag message from the given file. Use - to read the message from the standard
	   input. Implies -a if none of -a, -s, or -u <key-id> is given.

       --cleanup=<mode>
	   This option sets how the tag message is cleaned up. The <mode> can be one of verbatim,
	   whitespace and strip. The strip mode is default. The verbatim mode does not change
	   message at all, whitespace removes just leading/trailing whitespace lines and strip
	   removes both whitespace and commentary.

       <tagname>
	   The name of the tag to create, delete, or describe. The new tag name must pass all
	   checks defined by git-check-ref-format(1). Some of these checks may restrict the
	   characters allowed in a tag name.

       <commit>, <object>
	   The object that the new tag will refer to, usually a commit. Defaults to HEAD.

CONFIGURATION
       By default, git tag in sign-with-default mode (-s) will use your committer identity (of
       the form "Your Name <your@email.address>") to find a key. If you want to use a different
       default key, you can specify it in the repository configuration as follows:

	   [user]
	       signingkey = <gpg-key-id>

DISCUSSION
   On Re-tagging
       What should you do when you tag a wrong commit and you would want to re-tag?

       If you never pushed anything out, just re-tag it. Use "-f" to replace the old one. And
       you're done.

       But if you have pushed things out (or others could just read your repository directly),
       then others will have already seen the old tag. In that case you can do one of two things:

	1. The sane thing. Just admit you screwed up, and use a different name. Others have
	   already seen one tag-name, and if you keep the same name, you may be in the situation
	   that two people both have "version X", but they actually have different "X"'s. So just
	   call it "X.1" and be done with it.

	2. The insane thing. You really want to call the new version "X" too, even though others
	   have already seen the old one. So just use git tag -f again, as if you hadn't already
	   published the old one.

       However, Git does not (and it should not) change tags behind users back. So if somebody
       already got the old tag, doing a git pull on your tree shouldn't just make them overwrite
       the old one.

       If somebody got a release tag from you, you cannot just change the tag for them by
       updating your own one. This is a big security issue, in that people MUST be able to trust
       their tag-names. If you really want to do the insane thing, you need to just fess up to
       it, and tell people that you messed up. You can do that by making a very public
       announcement saying:

	   Ok, I messed up, and I pushed out an earlier version tagged as X. I
	   then fixed something, and retagged the *fixed* tree as X again.

	   If you got the wrong tag, and want the new one, please delete
	   the old one and fetch the new one by doing:

		   git tag -d X
		   git fetch origin tag X

	   to get my updated tag.

	   You can test which tag you have by doing

		   git rev-parse X

	   which should return 0123456789abcdef.. if you have the new version.

	   Sorry for the inconvenience.

       Does this seem a bit complicated? It should be. There is no way that it would be correct
       to just "fix" it automatically. People need to know that their tags might have been
       changed.

   On Automatic following
       If you are following somebody else's tree, you are most likely using remote-tracking
       branches (refs/heads/origin in traditional layout, or refs/remotes/origin/master in the
       separate-remote layout). You usually want the tags from the other end.

       On the other hand, if you are fetching because you would want a one-shot merge from
       somebody else, you typically do not want to get tags from there. This happens more often
       for people near the toplevel but not limited to them. Mere mortals when pulling from each
       other do not necessarily want to automatically get private anchor point tags from the
       other person.

       Often, "please pull" messages on the mailing list just provide two pieces of information:
       a repo URL and a branch name; this is designed to be easily cut&pasted at the end of a git
       fetch command line:

	   Linus, please pull from

		   git://git..../proj.git master

	   to get the following updates...

       becomes:

	   $ git pull git://git..../proj.git master

       In such a case, you do not want to automatically follow the other person's tags.

       One important aspect of Git is its distributed nature, which largely means there is no
       inherent "upstream" or "downstream" in the system. On the face of it, the above example
       might seem to indicate that the tag namespace is owned by the upper echelon of people and
       that tags only flow downwards, but that is not the case. It only shows that the usage
       pattern determines who are interested in whose tags.

       A one-shot pull is a sign that a commit history is now crossing the boundary between one
       circle of people (e.g. "people who are primarily interested in the networking part of the
       kernel") who may have their own set of tags (e.g. "this is the third release candidate
       from the networking group to be proposed for general consumption with 2.6.21 release") to
       another circle of people (e.g. "people who integrate various subsystem improvements"). The
       latter are usually not interested in the detailed tags used internally in the former group
       (that is what "internal" means). That is why it is desirable not to follow tags
       automatically in this case.

       It may well be that among networking people, they may want to exchange the tags internal
       to their group, but in that workflow they are most likely tracking each other's progress
       by having remote-tracking branches. Again, the heuristic to automatically follow such tags
       is a good thing.

   On Backdating Tags
       If you have imported some changes from another VCS and would like to add tags for major
       releases of your work, it is useful to be able to specify the date to embed inside of the
       tag object; such data in the tag object affects, for example, the ordering of tags in the
       gitweb interface.

       To set the date used in future tag objects, set the environment variable
       GIT_COMMITTER_DATE (see the later discussion of possible values; the most common form is
       "YYYY-MM-DD HH:MM").

       For example:

	   $ GIT_COMMITTER_DATE="2006-10-02 10:31" git tag -s v1.0.1

DATE FORMATS
       The GIT_AUTHOR_DATE, GIT_COMMITTER_DATE environment variables support the following date
       formats:

       Git internal format
	   It is <unix timestamp> <timezone offset>, where <unix timestamp> is the number of
	   seconds since the UNIX epoch.  <timezone offset> is a positive or negative offset from
	   UTC. For example CET (which is 2 hours ahead UTC) is +0200.

       RFC 2822
	   The standard email format as described by RFC 2822, for example Thu, 07 Apr 2005
	   22:13:13 +0200.

       ISO 8601
	   Time and date specified by the ISO 8601 standard, for example 2005-04-07T22:13:13. The
	   parser accepts a space instead of the T character as well.

	       Note
	       In addition, the date part is accepted in the following formats: YYYY.MM.DD,
	       MM/DD/YYYY and DD.MM.YYYY.

SEE ALSO
       git-check-ref-format(1).

GIT
       Part of the git(1) suite

Git 1.8.3.1				    06/10/2014				       GIT-TAG(1)
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