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The user can be presented with invalid completion results when trying to complete a 'git checkout' command. This can happen when using a branch name prefix that matches multiple remote branches. For example, if available branches are: master remotes/GitHub/maint remotes/GitHub/master remotes/origin/maint remotes/origin/master When performing completion on 'git checkout ma' the user will be given the choices: maint master However, 'git checkout maint' will fail in this case, although completion previously said 'maint' was valid. Furthermore, when performing completion on 'git checkout mai', no choices will be suggested. So, the user is first told that the branch name 'maint' is valid, but when trying to complete 'mai' into 'maint', that completion is no longer valid. The completion results should never propose 'maint' as a valid branch name, since 'git checkout' will refuse it. The reason for this bug is that the uniq program only works with sorted input. The man page states "uniq prints the unique lines in a sorted file". When __git_refs uses the guess heuristic employed by checkout for tracking branches it wants to consider remote branches but only if the branch name is unique. To do that, it calls 'uniq -u'. However the input given to 'uniq -u' is not sorted. Therefore, in the above example, when dealing with 'git checkout ma', "__git_refs '' 1" will find the following list: master maint master maint master which, when passed to 'uniq -u' will remain the same. Therefore 'maint' will be wrongly suggested as a valid option. When dealing with 'git checkout mai', the list will be: maint maint which happens to be sorted and will be emptied by 'uniq -u', properly ignoring 'maint'. A solution for preventing the completion script from suggesting such invalid branch names is to first call 'sort' and then 'uniq -u'. Signed-off-by: Marc Khouzam <marc.khouzam@gmail.com> Reviewed-by: Felipe Contreras <felipe.contreras@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com> |
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Contributed Software Although these pieces are available as part of the official git source tree, they are in somewhat different status. The intention is to keep interesting tools around git here, maybe even experimental ones, to give users an easier access to them, and to give tools wider exposure, so that they can be improved faster. I am not expecting to touch these myself that much. As far as my day-to-day operation is concerned, these subdirectories are owned by their respective primary authors. I am willing to help if users of these components and the contrib/ subtree "owners" have technical/design issues to resolve, but the initiative to fix and/or enhance things _must_ be on the side of the subtree owners. IOW, I won't be actively looking for bugs and rooms for enhancements in them as the git maintainer -- I may only do so just as one of the users when I want to scratch my own itch. If you have patches to things in contrib/ area, the patch should be first sent to the primary author, and then the primary author should ack and forward it to me (git pull request is nicer). This is the same way as how I have been treating gitk, and to a lesser degree various foreign SCM interfaces, so you know the drill. I expect that things that start their life in the contrib/ area to graduate out of contrib/ once they mature, either by becoming projects on their own, or moving to the toplevel directory. On the other hand, I expect I'll be proposing removal of disused and inactive ones from time to time. If you have new things to add to this area, please first propose it on the git mailing list, and after a list discussion proves there are some general interests (it does not have to be a list-wide consensus for a tool targeted to a relatively narrow audience -- for example I do not work with projects whose upstream is svn, so I have no use for git-svn myself, but it is of general interest for people who need to interoperate with SVN repositories in a way git-svn works better than git-svnimport), submit a patch to create a subdirectory of contrib/ and put your stuff there. -jc