info files with "refname 'HEAD' is ambiguous" #2748
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In certain cases, the following can be added to info files by Drush:
datestamp = "warning: refname 'HEAD' is ambiguous."
datestamp should be an integer. This is a fix.
To reproduce the problem, use drush make to build a makefile which references a repository containing a tag "HEAD". The error is because tag "HEAD" is the same as Git's use of HEAD to indicate the current position.