[llvm-dev] RFC: Move the test-suite LLVM project to GitHub?

[Joachim Durchholz via llvm-dev]

Am 25.02.2016 um 17:25 schrieb Sanjoy Das:
> One thing to watch out for: by default, in git, only the commit date
> (and not the *push date*) is part of the commit metadata.  This means
> if I write a patch today and push it two months later, the commit date
> on the commit will be skewed by two months.

Option 1: Rewrite your local history so that the last commit was done on 
the day you push; the command is "git commit --amend".

Option 2: Edit the changelog to reflect that you pushed something. This 
is the cleanest option in the sense that if the push history is 
relevant, this should probably be in the changelog.

Option 3: Postpone the commit to the day you push. This is only feasible 
if you have that work in a separate tree that you don't need to touch 
between last commit and push. Even then this isn't the first thing that 
I'd do, but maybe your use case is better suited for that.

Option 4: When merging the topic branch into the master branch before 
pushing, do "git merge --no-ff". This will create a merge commit even if 
the merge would run as a fast-forward, non-commit-creating merge. This 
is the "official way" to achieve what you want, if you have push rights.

 > We could fix this using a
 > hook, but then the complication is that as soon as the hook changes
 > the commit date to `date`, the SHA-1 of the newly edited commit will
 > change.

 From the various "cool tricks around git" websites that I have seen 
over time, most strongly advise against modifying the tree in hooks even 
when it's possible at all.
Most highlight that the committer will have to remember to git pull from 
origin, otherwise they will have to merge before the next push. I dimly 
recall having seen mentions of more troubles down that road, but I 
forgot the details.