#11717: git-2.21.0
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Reporter: bdubbs | Owner: bdubbs
Type: enhancement | Status: assigned
Priority: normal | Milestone: 8.5
Component: BOOK | Version: SVN
Severity: normal | Resolution:
Keywords: |
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Comment (by bdubbs):
Backward Compatibility Notes
* Historically, the "-m" (mainline) option can only be used for "git
cherry-pick" and "git revert" when working with a merge commit.
This version of Git no longer warns or errors out when working with
a single-parent commit, as long as the argument to the "-m" option
is 1 (i.e. it has only one parent, and the request is to pick or
revert relative to that first parent). Scripts that relied on the
behaviour may get broken with this change.
Updates since v2.20
* The "http.version" configuration variable can be used with recent
enough versions of cURL library to force the version of HTTP used
to talk when fetching and pushing.
* Small fixes and features for fast-export and fast-import, mostly on
the fast-export side has been made.
* "git push $there $src:$dst" rejects when $dst is not a fully
qualified refname and it is not clear what the end user meant. The
codepath has been taught to give a clearer error message, and also
guess where the push should go by taking the type of the pushed
object into account (e.g. a tag object would want to go under
refs/tags/).
* "git checkout [<tree-ish>] path..." learned to report the number of
paths that have been checked out of the index or the tree-ish,
which gives it the same degree of noisy-ness as the case in which
the command checks out a branch. "git checkout -m <pathspec>" to
undo conflict resolution gives a similar message.
* "git quiltimport" learned "--keep-non-patch" option.
* "git worktree remove" and "git worktree move" refused to work when
there is a submodule involved. This has been loosened to ignore
uninitialized submodules.
* "git cherry-pick -m1" was forbidden when picking a non-merge
commit, even though there _is_ parent number 1 for such a commit.
This was done to avoid mistakes back when "cherry-pick" was about
picking a single commit, but is no longer useful with "cherry-pick"
that can pick a range of commits. Now the "-m$num" option is
allowed when picking any commit, as long as $num names an existing
parent of the commit.
* Update "git multimail" from the upstream.
* "git p4" update.
* The "--format=<placeholder>" option of for-each-ref, branch and tag
learned to show a few more traits of objects that can be learned by
the object_info API.
* "git rebase -i" learned to re-execute a command given with 'exec'
to run after it failed the last time.
* "git diff --color-moved-ws" updates.
* Custom userformat "log --format" learned %S atom that stands for
the tip the traversal reached the commit from, i.e. --source.
* "git instaweb" learned to drive http.server that comes with
"batteries included" Python installation (both Python2 & 3).
* A new encoding UTF-16LE-BOM has been invented to force encoding to
UTF-16 with BOM in little endian byte order, which cannot be directly
generated by using iconv.
* A new date format "--date=human" that morphs its output depending
on how far the time is from the current time has been introduced.
"--date=auto:human" can be used to use this new format (or any
existing format) when the output is going to the pager or to the
terminal, and otherwise the default format.
Performance, Internal Implementation, Development Support etc.
* Code clean-up with optimization for the codepath that checks
(non-)existence of loose objects.
* More codepaths have become aware of working with in-core repository
instances other than the default "the_repository".
* The "strncat()" function is now among the banned functions.
* Portability updates for the HPE NonStop platform.
* Earlier we added "-Wformat-security" to developer builds, assuming
that "-Wall" (which includes "-Wformat" which in turn is required
to use "-Wformat-security") is always in effect. This is not true
when config.mak.autogen is in use, unfortunately. This has been
fixed by unconditionally adding "-Wall" to developer builds.
* The loose object cache used to optimize existence look-up has been
updated.
* Flaky tests can now be repeatedly run under load with the
"--stress" option.
* Documentation/Makefile is getting prepared for manpage
localization.
* "git fetch-pack" now can talk the version 2 protocol.
* sha-256 hash has been added and plumbed through the code to allow
building Git with the "NewHash".
* Debugging help for http transport.
* "git fetch --deepen=<more>" has been corrected to work over v2
protocol.
* The code to walk tree objects has been taught that we may be
working with object names that are not computed with SHA-1.
* The in-core repository instances are passed through more codepaths.
* Update the protocol message specification to allow only the limited
use of scaled quantities. This is to ensure potential compatibility
issues will not get out of hand.
* Micro-optimize the code that prepares commit objects to be walked
by "git rev-list" when the commit-graph is available.
* "git fetch" and "git upload-pack" learned to send all exchanges over
the sideband channel while talking the v2 protocol.
* The codepath to write out commit-graph has been optimized by
following the usual pattern of visiting objects in in-pack order.
* The codepath to show progress meter while writing out commit-graph
file has been improved.
* Cocci rules have been updated to encourage use of strbuf_addbuf().
* "git rebase --merge" has been reimplemented by reusing the internal
machinery used for "git rebase -i".
* More code in "git bisect" has been rewritten in C.
* Instead of going through "git-rebase--am" scriptlet to use the "am"
backend, the built-in version of "git rebase" learned to drive the
"am" backend directly.
* The assumption to work on the single "in-core index" instance has
been reduced from the library-ish part of the codebase.
* The test lint learned to catch non-portable "sed" options.
* "git pack-objects" learned another algorithm to compute the set of
objects to send, that trades the resulting packfile off to save
traversal cost to favor small pushes.
* The travis CI scripts have been corrected to build Git with the
compiler(s) of our choice.
* "git submodule update" learned to abort early when core.worktree
for the submodule is not set correctly to prevent spreading damage.
* Test suite has been adjusted to run on Azure Pipeline.
* Running "Documentation/doc-diff x" from anywhere other than the
top-level of the working tree did not show the usage string
correctly, which has been fixed.
* Use of the sparse tool got easier to customize from the command
line to help developers.
* A new target "coverage-prove" to run the coverage test under
"prove" has been added.
* A flakey "p4" test has been removed.
* The code and tests assume that the system supplied iconv() would
always use BOM in its output when asked to encode to UTF-16 (or
UTF-32), but apparently some implementations output big-endian
without BOM. A compile-time knob has been added to help such
systems (e.g. NonStop) to add BOM to the output to increase
portability.
--
Ticket URL: <http://wiki.linuxfromscratch.org/blfs/ticket/11717#comment:2>
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