I’m looking for a counter-part of git commit --amend in Mercurial, i.e. a way to modify the commit which my working copy is linked to. I’m only interested in the last commit, not an arbitrary earlier commit.
The requirements for this amend-procedure are:
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if possible, it should not require any extensions. It must not require non-default extensions, i.e. extensions which do not come with an official Mercurial installation.
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if the commit to amend is one head of my current branch, no new head should be created. If the commit is not head, a new head may be created.
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the procedure should be safe in a way that if for whatever reasons the amending fails, I want to have the same working copy and repository state restored as before the amending. With other words, if the amending itself can fail, there should be a fail-safe procedure to restore the working copy and repository state. I’m referring to “failures” which lie in the nature of the amend-procedure (like e.g. conflicts), not to file-system-related problems (like access restrictions, not being able to lock a file for writing, …)
Update (1):
- the procedure must be automatable, so it can be performed by a GUI client without any user interaction required.
Update (2):
- files in the working directory must not be touched (there may be file system locks on certain modified files). This especially means, that a possible approach may at no point require a clean working directory.
