tgif.git - Terin's Improved Git Fork

Age	Commit message (Collapse)	Author	Files	Lines
2019-03-14	get_oid(): when an object was not found, try harder	Johannes Schindelin	1	-1/+1
	It is quite possible that the loose object cache gets stale when new objects are written. In that case, get_oid() would potentially say that it cannot find a given object, even if it should find it. Let's blow away the loose object cache as well as the read packs and try again in that case. Note: this does not affect the code path that was introduced to help avoid looking for the same non-existing objects (which made some operations really expensive via NFS): that code path is handled by the `OBJECT_INFO_QUICK` flag (which does not even apply to `get_oid()`, which has no equivalent flag, at least at the time this patch was written). This incidentally fixes the problem identified earlier where an interactive rebase wanted to re-read (and validate) the todo list after an `exec` command modified it. Helped-by: Jeff King <peff@peff.net> Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-03-14	rebase -i: demonstrate obscure loose object cache bug	Johannes Schindelin	1	-0/+22
	We specifically support `exec` commands in `git rebase -i`'s todo lists to rewrite the very same todo list. Of course, we need to validate that todo list when re-reading it. It is also totally legitimate to extend the todo list by `pick` lines using short names of commits that were created only after the rebase started. And this is where the loose object cache interferes with this feature: if some loose object was read whose hash shares the same first two digits with a commit that was not yet created when that loose object was created, then we fail to find that new commit by its short name in `get_oid()`, and the interactive rebase fails with an obscure error message like: error: invalid line 1: pick 6568fef error: please fix this using 'git rebase --edit-todo'. Let's first demonstrate that this is actually a bug in a new regression test, in a separate commit so that other developers who do not believe me can cherry-pick it to confirm the problem. This new regression test generates two commits whose hashes share the first two hex digits (so that their corresponding loose objects live in the same subdirectory of .git/objects/, and are therefore supposed to be in the same loose object cache bin). It then picks the first, to make sure that the loose object cache is initialized and cached that object directory, then generates the second commit and picks it, too. Since the commit was generated in a different process than the sequencer that wants to pick it, the loose object cache had no chance of being updated in the meantime. Technically, we would need only one `exec` command in this regression test case, but for ease of implementation, it uses a pseudo-recursive call to the same script. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-04-27	rebase -i: reread the todo list if `exec` touched it	Stephen Hicks	1	-0/+14
	In the scripted version of the interactive rebase, there was no internal representation of the todo list; it was re-read before every command. That allowed the hack that an `exec` command could append (or even completely rewrite) the todo list. This hack was broken by the partial conversion of the interactive rebase to C, and this patch reinstates it. We also add a small test to verify that this fix does not regress in the future. Signed-off-by: Stephen Hicks <sdh@google.com> Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>