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The recently introduced commit-graph auxiliary data is incompatible
with mechanisms such as replace & grafts that "breaks" immutable
nature of the object reference relationship. Disable optimizations
based on its use (and updating existing commit-graph) when these
incompatible features are in use in the repository.
* ds/commit-graph-with-grafts:
commit-graph: close_commit_graph before shallow walk
commit-graph: not compatible with uninitialized repo
commit-graph: not compatible with grafts
commit-graph: not compatible with replace objects
test-repository: properly init repo
commit-graph: update design document
refs.c: upgrade for_each_replace_ref to be a each_repo_ref_fn callback
refs.c: migrate internal ref iteration to pass thru repository argument
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Clarify a part of technical documentation for rerere.
* tg/rerere-doc-updates:
rerere: add note about files with existing conflict markers
rerere: mention caveat about unmatched conflict markers
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Fixes to "git rerere" corner cases, especially when conflict
markers cannot be parsed in the file.
* tg/rerere:
rerere: recalculate conflict ID when unresolved conflict is committed
rerere: teach rerere to handle nested conflicts
rerere: return strbuf from handle path
rerere: factor out handle_conflict function
rerere: only return whether a path has conflicts or not
rerere: fix crash with files rerere can't handle
rerere: add documentation for conflict normalization
rerere: mark strings for translation
rerere: wrap paths in output in sq
rerere: lowercase error messages
rerere: unify error messages when read_cache fails
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4af3220 ("rerere: teach rerere to handle nested conflicts",
2018-08-05) introduced slightly better behaviour if the user commits
conflict markers and then gets another conflict in 'git rerere'.
However this is just a heuristic to punt on such conflicts better, and
doesn't deal with any unmatched conflict markers. Make that clearer
in the documentation.
Suggested-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Thomas Gummerer <t.gummerer@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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As it exists right now, the commit-graph feature may provide
inconsistent results when combined with commit grafts, replace objects,
and shallow clones. Update the design document to discuss why these
interactions are difficult to reconcile and how we will avoid errors by
preventing updates to and reads from the commit-graph file when these
other features exist.
Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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* ds/multi-pack-index: (23 commits)
midx: clear midx on repack
packfile: skip loading index if in multi-pack-index
midx: prevent duplicate packfile loads
midx: use midx in approximate_object_count
midx: use existing midx when writing new one
midx: use midx in abbreviation calculations
midx: read objects from multi-pack-index
config: create core.multiPackIndex setting
midx: write object offsets
midx: write object id fanout chunk
midx: write object ids in a chunk
midx: sort and deduplicate objects from packfiles
midx: read pack names into array
multi-pack-index: write pack names in chunk
multi-pack-index: read packfile list
packfile: generalize pack directory list
t5319: expand test data
multi-pack-index: load into memory
midx: write header information to lockfile
multi-pack-index: add 'write' verb
...
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Doc updates.
* jh/partial-clone-doc:
partial-clone: render design doc using asciidoc
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Documentation update.
* ab/newhash-is-sha256:
doc hash-function-transition: pick SHA-256 as NewHash
doc hash-function-transition: note the lack of a changelog
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Doc fix.
* ms/http-proto-doc:
doc: fix want-capability separator
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Doc update.
* bw/protocol-v2:
pack-protocol: mention and point to docs for protocol v2
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Rendered documentation can be easier to read than raw text because
headings and emphasized phrases stand out. Add the missing markup and
Makefile rule required to render this design document using asciidoc.
Tested by running
make -C Documentation technical/partial-clone.html
and viewing the output in a browser.
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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From a security perspective, it seems that SHA-256, BLAKE2, SHA3-256,
K12, and so on are all believed to have similar security properties.
All are good options from a security point of view.
SHA-256 has a number of advantages:
* It has been around for a while, is widely used, and is supported by
just about every single crypto library (OpenSSL, mbedTLS, CryptoNG,
SecureTransport, etc).
* When you compare against SHA1DC, most vectorized SHA-256
implementations are indeed faster, even without acceleration.
* If we're doing signatures with OpenPGP (or even, I suppose, CMS),
we're going to be using SHA-2, so it doesn't make sense to have our
security depend on two separate algorithms when either one of them
alone could break the security when we could just depend on one.
So SHA-256 it is. Update the hash-function-transition design doc to
say so.
After this patch, there are no remaining instances of the string
"NewHash", except for an unrelated use from 2008 as a variable name in
t/t9700/test.pl.
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Acked-by: brian m. carlson <sandals@crustytoothpaste.net>
Acked-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Acked-by: Dan Shumow <danshu@microsoft.com>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Currently rerere can't handle nested conflicts and will error out when
it encounters such conflicts. Do that by recursively calling the
'handle_conflict' function to normalize the conflict.
Note that a conflict like this would only be produced if a user
commits a file with conflict markers, and gets a conflict including
that in a susbsequent operation.
The conflict ID calculation here deserves some explanation:
As we are using the same handle_conflict function, the nested conflict
is normalized the same way as for non-nested conflicts, which means
the ancestor in the diff3 case is stripped out, and the parts of the
conflict are ordered alphabetically.
The conflict ID is however is only calculated in the top level
handle_conflict call, so it will include the markers that 'rerere'
adds to the output. e.g. say there's the following conflict:
<<<<<<< HEAD
1
=======
<<<<<<< HEAD
3
=======
2
>>>>>>> branch-2
>>>>>>> branch-3~
it would be recorde as follows in the preimage:
<<<<<<<
1
=======
<<<<<<<
2
=======
3
>>>>>>>
>>>>>>>
and the conflict ID would be calculated as
sha1(1<NUL><<<<<<<
2
=======
3
>>>>>>><NUL>)
Stripping out vs. leaving the conflict markers in place in the inner
conflict should have no practical impact, but it simplifies the
implementation.
Signed-off-by: Thomas Gummerer <t.gummerer@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Add some documentation for the logic behind the conflict normalization
in rerere.
Helped-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Thomas Gummerer <t.gummerer@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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"git fsck" learns to make sure the optional commit-graph file is in
a sane state.
* ds/commit-graph-fsck: (23 commits)
coccinelle: update commit.cocci
commit-graph: update design document
gc: automatically write commit-graph files
commit-graph: add '--reachable' option
commit-graph: use string-list API for input
fsck: verify commit-graph
commit-graph: verify contents match checksum
commit-graph: test for corrupted octopus edge
commit-graph: verify commit date
commit-graph: verify generation number
commit-graph: verify parent list
commit-graph: verify root tree OIDs
commit-graph: verify objects exist
commit-graph: verify corrupt OID fanout and lookup
commit-graph: verify required chunks are present
commit-graph: verify catches corrupt signature
commit-graph: add 'verify' subcommand
commit-graph: load a root tree from specific graph
commit: force commit to parse from object database
commit-graph: parse commit from chosen graph
...
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Unlike ref advertisement, client capabilities and the first want are
separated by SP, not NUL, in the implementation. Fix the documentation
to align with the implementation. pack-protocol.txt is already fixed.
Signed-off-by: Masaya Suzuki <masayasuzuki@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The changelog embedded in the document pre-dates the addition of the
document to git.git (it used to be a Google Doc), so it only goes up
to 752414ae43 ("technical doc: add a design doc for hash function
transition", 2017-09-27).
Since then I made some small edits to it, which would have been worthy
of including in this changelog (but weren't). Instead of amending it
to include these, just note that future changes will be noted in the
log.
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Partial clone support of "git clone" has been updated to correctly
validate the objects it receives from the other side. The server
side has been corrected to send objects that are directly
requested, even if they may match the filtering criteria (e.g. when
doing a "lazy blob" partial clone).
* jt/partial-clone-fsck-connectivity:
clone: check connectivity even if clone is partial
upload-pack: send refs' objects despite "filter"
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"git fetch" failed to correctly validate the set of objects it
received when making a shallow history deeper, which has been
corrected.
* jt/connectivity-check-after-unshallow:
fetch-pack: write shallow, then check connectivity
fetch-pack: implement ref-in-want
fetch-pack: put shallow info in output parameter
fetch: refactor to make function args narrower
fetch: refactor fetch_refs into two functions
fetch: refactor the population of peer ref OIDs
upload-pack: test negotiation with changing repository
upload-pack: implement ref-in-want
test-pkt-line: add unpack-sideband subcommand
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"git rebase" behaved slightly differently depending on which one of
the three backends gets used; this has been documented and an
effort to make them more uniform has begun.
* en/rebase-consistency:
git-rebase: make --allow-empty-message the default
t3401: add directory rename testcases for rebase and am
git-rebase.txt: document behavioral differences between modes
directory-rename-detection.txt: technical docs on abilities and limitations
git-rebase.txt: address confusion between --no-ff vs --force-rebase
git-rebase: error out when incompatible options passed
t3422: new testcases for checking when incompatible options passed
git-rebase.sh: update help messages a bit
git-rebase.txt: document incompatible options
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Signed-off-by: Brandon Williams <bmwill@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The final pair of chunks for the multi-pack-index file stores the object
offsets. We default to using 32-bit offsets as in the pack-index version
1 format, but if there exists an offset larger than 32-bits, we use a
trick similar to the pack-index version 2 format by storing all offsets
at least 2^31 in a 64-bit table; we use the 32-bit table to point into
that 64-bit table as necessary.
We only store these 64-bit offsets if necessary, so create a test that
manipulates a version 2 pack-index to fake a large offset. This allows
us to test that the large offset table is created, but the data does not
match the actual packfile offsets. The multi-pack-index offset does match
the (corrupted) pack-index offset, so a future feature will compare these
offsets during a 'verify' step.
Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The multi-pack-index needs to track which packfiles it indexes. Store
these in our first required chunk. Since filenames are not well
structured, add padding to keep good alignment in later chunks.
Modify the 'git multi-pack-index read' subcommand to output the
existence of the pack-file name chunk. Modify t5319-multi-pack-index.sh
to reflect this new output and the new expected number of chunks.
Defense in depth: A pattern we are using in the multi-pack-index feature
is to verify the data as we write it. We want to ensure we never write
invalid data to the multi-pack-index. There are many checks that verify
that the values we are writing fit the format definitions. This mainly
helps developers while working on the feature, but it can also identify
issues that only appear when dealing with very large data sets. These
large sets are hard to encode into test cases.
Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Docfix.
* ds/commit-graph:
commit-graph: fix documentation inconsistencies
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Doc fix.
* vs/typofixes:
Documentation: spelling and grammar fixes
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Doc fix.
* bw/protocol-v2:
protocol-v2 doc: put HTTP headers after request
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The multi-pack-index feature generalizes the existing pack-index
feature by indexing objects across multiple pack-files.
Describe the basic file format, using a 12-byte header followed by
a lookup table for a list of "chunks" which will be described later.
The file ends with a footer containing a checksum using the hash
algorithm.
The header allows later versions to create breaking changes by
advancing the version number. We can also change the hash algorithm
using a different version value.
We will add the individual chunk format information as we introduce
the code that writes that information.
Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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A filter line in a request to upload-pack filters out objects regardless
of whether they are directly referenced by a "want" line or not. This
means that cloning with "--filter=blob:none" (or another filter that
excludes blobs) from a repository with at least one ref pointing to a
blob (for example, the Git repository itself) results in output like the
following:
error: missing object referenced by 'refs/tags/junio-gpg-pub'
and if that particular blob is not referenced by a fetched tree, the
resulting clone fails fsck because there is no object from the remote to
vouch that the missing object is a promisor object.
Update both the protocol and the upload-pack implementation to include
all explicitly specified "want" objects in the packfile regardless of
the filter specification.
Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The commit-graph feature shipped in Git 2.18 has some inconsistencies in
the constants used by the implementation and specified by the format
document.
The commit data chunk uses the key "CDAT" in the file format, but was
previously documented to say "CGET".
The commit data chunk stores commit parents using two 32-bit fields that
typically store the integer position of the parent in the list of commit
ids within the commit-graph file. When a parent does not exist, we had
documented the value 0xffffffff, but implemented the value 0x70000000.
This swap is easy to correct in the documentation, but unfortunately
reduces the number of commits that we can store in the commit-graph.
Update that estimate, too.
Reported-by: Grant Welch <gwelch925@gmail.com>
Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Currently, while performing packfile negotiation, clients are only
allowed to specify their desired objects using object ids. This causes
a vulnerability to failure when an object turns non-existent during
negotiation, which may happen if, for example, the desired repository is
provided by multiple Git servers in a load-balancing arrangement and
there exists replication delay.
In order to eliminate this vulnerability, implement the ref-in-want
feature for the 'fetch' command in protocol version 2. This feature
enables the 'fetch' command to support requests in the form of ref names
through a new "want-ref <ref>" parameter. At the conclusion of
negotiation, the server will send a list of all of the wanted references
(as provided by "want-ref" lines) in addition to the generated packfile.
Signed-off-by: Brandon Williams <bmwill@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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There are a variety of aspects that are common to all rebases regardless
of which backend is in use; however, the behavior for these different
aspects varies in ways that could surprise users. (In fact, it's not
clear -- to me at least -- that these differences were even desirable or
intentional.) Document these differences.
Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The commit-graph feature is now integrated with 'fsck' and 'gc',
so remove those items from the "Future Work" section of the
commit-graph design document.
Also remove the section on lazy-loading trees, as that was completed
in an earlier patch series.
Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Update to ds/generation-numbers topic.
* ds/commit-graph-lockfile-fix:
commit-graph: fix UX issue when .lock file exists
commit-graph.txt: update design document
merge: check config before loading commits
commit: use generation number in remove_redundant()
commit: add short-circuit to paint_down_to_common()
commit: use generation numbers for in_merge_bases()
ref-filter: use generation number for --contains
commit-graph: always load commit-graph information
commit: use generations in paint_down_to_common()
commit-graph: compute generation numbers
commit: add generation number to struct commit
ref-filter: fix outdated comment on in_commit_list
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Signed-off-by: Ville Skyttä <ville.skytta@iki.fi>
Reviewed-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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HTTP servers return 400 if you send headers before the GET request.
Signed-off-by: Josh Steadmon <steadmon@google.com>
Reviewed-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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When a short hexadecimal string is used to name an object but there
are multiple objects that share the string as the prefix of their
names, the code lists these ambiguous candidates in a help message.
These object names are now sorted according to their types for
easier eyeballing.
* ab/get-short-oid:
get_short_oid: sort ambiguous objects by type, then SHA-1
sha1-name.c: move around the collect_ambiguous() function
git-p4: change "commitish" typo to "committish"
sha1-array.h: align function arguments
sha1-name.c: remove stray newline
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Transfer protocol v2 learned to support the partial clone.
* jt/partial-clone-proto-v2:
{fetch,upload}-pack: support filter in protocol v2
upload-pack: read config when serving protocol v2
upload-pack: fix error message typo
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The functionality of "$GIT_DIR/info/grafts" has been superseded by
the "refs/replace/" mechanism for some time now, but the internal
code had support for it in many places, which has been cleaned up
in order to drop support of the "grafts" mechanism.
* js/deprecate-grafts:
Remove obsolete script to convert grafts to replace refs
technical/shallow: describe why shallow cannot use replace refs
technical/shallow: stop referring to grafts
filter-branch: stop suggesting to use grafts
Deprecate support for .git/info/grafts
Add a test for `git replace --convert-graft-file`
replace: introduce --convert-graft-file
replace: prepare create_graft() for converting graft files wholesale
replace: "libify" create_graft() and callees
replace: avoid using die() to indicate a bug
commit: Let the callback of for_each_mergetag return on error
argv_array: offer to split a string by whitespace
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The transport protocol v2 is getting updated further.
* bw/server-options:
fetch: send server options when using protocol v2
ls-remote: send server options when using protocol v2
serve: introduce the server-option capability
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Doc update.
* nd/pack-format-doc:
pack-format.txt: more details on pack file format
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Doc update.
* ao/config-api-doc:
doc: fix config API documentation about config_with_options
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We now calculate generation numbers in the commit-graph file and use
them in paint_down_to_common().
Expand the section on generation numbers to discuss how the three
special generation numbers GENERATION_NUMBER_INFINITY, _ZERO, and
_MAX interact with other generation numbers.
Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The current document mentions OBJ_* constants without their actual
values. A git developer would know these are from cache.h but that's
not very friendly to a person who wants to read this file to implement
a pack file parser.
Similarly, the deltified representation is not documented at all (the
"document" is basically patch-delta.c). Translate that C code to
English with a bit more about what ofs-delta and ref-delta mean.
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Change the output emitted when an ambiguous object is encountered so
that we show tags first, then commits, followed by trees, and finally
blobs. Within each type we show objects in hashcmp() order. Before
this change the objects were only ordered by hashcmp().
The reason for doing this is that the output looks better as a result,
e.g. the v2.17.0 tag before this change on "git show e8f2" would
display:
hint: The candidates are:
hint: e8f2093055 tree
hint: e8f21caf94 commit 2013-06-24 - bash prompt: print unique detached HEAD abbreviated object name
hint: e8f21d02f7 blob
hint: e8f21d577c blob
hint: e8f25a3a50 tree
hint: e8f26250fa commit 2017-02-03 - Merge pull request #996 from jeffhostetler/jeffhostetler/register_rename_src
hint: e8f2650052 tag v2.17.0
hint: e8f2867228 blob
hint: e8f28d537c tree
hint: e8f2a35526 blob
hint: e8f2bc0c06 commit 2015-05-10 - Documentation: note behavior for multiple remote.url entries
hint: e8f2cf6ec0 tree
Now we'll instead show:
hint: e8f2650052 tag v2.17.0
hint: e8f21caf94 commit 2013-06-24 - bash prompt: print unique detached HEAD abbreviated object name
hint: e8f26250fa commit 2017-02-03 - Merge pull request #996 from jeffhostetler/jeffhostetler/register_rename_src
hint: e8f2bc0c06 commit 2015-05-10 - Documentation: note behavior for multiple remote.url entries
hint: e8f2093055 tree
hint: e8f25a3a50 tree
hint: e8f28d537c tree
hint: e8f2cf6ec0 tree
hint: e8f21d02f7 blob
hint: e8f21d577c blob
hint: e8f2867228 blob
hint: e8f2a35526 blob
Since we show the commit data in the output that's nicely aligned once
we sort by object type. The decision to show tags before commits is
pretty arbitrary. I don't want to order by object_type since there
tags come last after blobs, which doesn't make sense if we want to
show the most important things first.
I could display them after commits, but it's much less likely that
we'll display a tag, so if there is one it makes sense to show it
prominently at the top.
A note on the implementation: Derrick rightly pointed out[1] that
we're bending over backwards here in get_short_oid() to first
de-duplicate the list, and then emit it, but could simply do it in one
step.
The reason for that is that oid_array_for_each_unique() doesn't
actually require that the array be sorted by oid_array_sort(), it just
needs to be sorted in some order that guarantees that all objects with
the same ID are adjacent to one another, which (barring a hash
collision, which'll be someone else's problem) the sort_ambiguous()
function does.
I agree that would be simpler for this code, and had forgotten why I
initially wrote it like this[2]. But on further reflection I think
it's better to do more work here just so we're not underhandedly using
the oid-array API where we lie about the list being sorted. That would
break any subsequent use of oid_array_lookup() in subtle ways.
I could get around that by hacking the API itself to support this
use-case and documenting it, which I did as a WIP patch in [3], but I
think it's too much code smell just for this one call site. It's
simpler for the API to just introduce a oid_array_for_each() function
to eagerly spew out the list without sorting or de-duplication, and
then do the de-duplication and sorting in two passes.
1. https://public-inbox.org/git/20180501130318.58251-1-dstolee@microsoft.com/
2. https://public-inbox.org/git/876047ze9v.fsf@evledraar.gmail.com/
3. https://public-inbox.org/git/874ljrzctc.fsf@evledraar.gmail.com/
Helped-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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In commit dc8441fdb ("config: don't implicitly use gitdir or commondir",
2017-06-14) the function git_config_with_options was renamed to
config_with_options to better reflect the fact that it does not access
the git global config or the repo config by default.
However Documentation/technical/api-config.txt still refers to the
previous name, fix that.
While at it also update the documentation about the extra parameters,
because they too changed since the initial definition.
Signed-off-by: Antonio Ospite <ao2@ao2.it>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Precompute and store information necessary for ancestry traversal
in a separate file to optimize graph walking.
* ds/commit-graph:
commit-graph: implement "--append" option
commit-graph: build graph from starting commits
commit-graph: read only from specific pack-indexes
commit: integrate commit graph with commit parsing
commit-graph: close under reachability
commit-graph: add core.commitGraph setting
commit-graph: implement git commit-graph read
commit-graph: implement git-commit-graph write
commit-graph: implement write_commit_graph()
commit-graph: create git-commit-graph builtin
graph: add commit graph design document
commit-graph: add format document
csum-file: refactor finalize_hashfile() method
csum-file: rename hashclose() to finalize_hashfile()
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