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When migrating reflog entries between different storage formats we end up with invalid old object IDs for the migrated entries: instead of writing the old object ID of the to-be-migrated entry, we end up with the all-zeroes object ID. The root cause of this issue is that we don't know to use the old object ID provided by the caller. Instead, we manually resolve the old object ID by resolving the current value of its matching reference. But as that reference does not yet exist in the target ref storage we always end up resolving it to all-zeroes. This issue got unnoticed as there is no user-facing command that would even show the old object ID. While `git log -g` knows to show the new object ID, we don't have any formatting directive to show the old object ID. Fix the bug by introducing a new flag `REF_LOG_USE_PROVIDED_OIDS`. If set, backends are instructed to use the old and new object IDs provided by the caller, without doing any manual resolving. Set this flag in `ref_transaction_update_reflog()`. Amend our tests in t1460-refs-migrate to use our test tool to read reflog entries. This test tool prints out both old and new object ID of each reflog entry, which fixes the test gap. Furthermore it also prints the full identity used to write the reflog, which provides test coverage for the previous commit in this patch series that fixed the identity for migrated reflogs. Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Git - fast, scalable, distributed revision control system
Git is a fast, scalable, distributed revision control system with an unusually rich command set that provides both high-level operations and full access to internals.
Git is an Open Source project covered by the GNU General Public License version 2 (some parts of it are under different licenses, compatible with the GPLv2). It was originally written by Linus Torvalds with help of a group of hackers around the net.
Please read the file INSTALL for installation instructions.
Many Git online resources are accessible from https://git-scm.com/ including full documentation and Git related tools.
See Documentation/gittutorial.adoc to get started, then see
Documentation/giteveryday.adoc for a useful minimum set of commands, and
Documentation/git-<commandname>.adoc for documentation of each command.
If git has been correctly installed, then the tutorial can also be
read with man gittutorial or git help tutorial, and the
documentation of each command with man git-<commandname> or git help <commandname>.
CVS users may also want to read Documentation/gitcvs-migration.adoc
(man gitcvs-migration or git help cvs-migration if git is
installed).
The user discussion and development of Git take place on the Git mailing list -- everyone is welcome to post bug reports, feature requests, comments and patches to git@vger.kernel.org (read Documentation/SubmittingPatches for instructions on patch submission and Documentation/CodingGuidelines).
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The name "git" was given by Linus Torvalds when he wrote the very first version. He described the tool as "the stupid content tracker" and the name as (depending on your mood):
- random three-letter combination that is pronounceable, and not actually used by any common UNIX command. The fact that it is a mispronunciation of "get" may or may not be relevant.
- stupid. contemptible and despicable. simple. Take your pick from the dictionary of slang.
- "global information tracker": you're in a good mood, and it actually works for you. Angels sing, and a light suddenly fills the room.
- "goddamn idiotic truckload of sh*t": when it breaks