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image spec: Correct set of acceptable characters in tags 

The image spec did not match the regexp that validates tags. It
neglected to mention that period and dash characters are allowed in
tags, as long as they are not the first character. It also did not
mention the length limit for tags.

Signed-off-by: Aaron Lehmann <aaron.lehmann@docker.com>
(cherry picked from commit 2f19e910bdeee94a2962ce8457325e92aa21ce0e)
Signed-off-by: Tibor Vass <tibor@docker.com>
This commit is contained in:
Aaron Lehmann 2016-07-05 09:59:45 -07:00 committed by Tibor Vass
parent b6349ac163
commit da2ad48b92
1 changed files with 2 additions and 1 deletions
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3
image/spec/v1.1.md
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@ -87,7 +87,8 @@ This specification uses the following terms:
<dd>
A tag serves to map a descriptive, user-given name to any single image
ID. Tag values are limited to the set of characters
<code>[a-zA-Z_0-9]</code>.
<code>[a-zA-Z0-9_.-]</code>, except they may not start with a <code>.</code>
or <code>-</code> character. Tags are limited to 127 characters.
</dd>
<dt>
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