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Suppose a fetch or push is requested between two shallow repositories
(with no history deepening or shortening). A pack that contains
necessary objects is transferred over together with .git/shallow of
the sender. The receiver has to determine whether it needs to update
.git/shallow if new refs needs new shallow comits.
The rule here is avoid updating .git/shallow by default. But we don't
want to waste the received pack. If the pack contains two refs, one
needs new shallow commits installed in .git/shallow and one does not,
we keep the latter and reject/warn about the former.
Even if .git/shallow update is allowed, we only add shallow commits
strictly necessary for the former ref (remember the sender can send
more shallow commits than necessary) and pay attention not to
accidentally cut the receiver history short (no history shortening is
asked for)
So the steps to figure out what ref need what new shallow commits are:
1. Split the sender shallow commit list into "ours" and "theirs" list
by has_sha1_file. Those that exist in current repo in "ours", the
remaining in "theirs".
2. Check the receiver .git/shallow, remove from "ours" the ones that
also exist in .git/shallow.
3. Fetch the new pack. Either install or unpack it.
4. Do has_sha1_file on "theirs" list again. Drop the ones that fail
has_sha1_file. Obviously the new pack does not need them.
5. If the pack is kept, remove from "ours" the ones that do not exist
in the new pack.
6. Walk the new refs to answer the question "what shallow commits,
both ours and theirs, are required in .git/shallow in order to add
this ref?". Shallow commits not associated to any refs are removed
from their respective list.
7. (*) Check reachability (from the current refs) of all remaining
commits in "ours". Those reachable are removed. We do not want to
cut any part of our (reachable) history. We only check up
commits. True reachability test is done by
check_everything_connected() at the end as usual.
8. Combine the final "ours" and "theirs" and add them all to
.git/shallow. Install new refs. The case where some hook rejects
some refs on a push is explained in more detail in the push
patches.
Of these steps, #6 and #7 are expensive. Both require walking through
some commits, or in the worst case all commits. And we rather avoid
them in at least common case, where the transferred pack does not
contain any shallow commits that the sender advertises. Let's look at
each scenario:
1) the sender has longer history than the receiver
All shallow commits from the sender will be put into "theirs" list
at step 1 because none of them exists in current repo. In the
common case, "theirs" becomes empty at step 4 and exit early.
2) the sender has shorter history than the receiver
All shallow commits from the sender are likely in "ours" list at
step 1. In the common case, if the new pack is kept, we could empty
"ours" and exit early at step 5.
If the pack is not kept, we hit the expensive step 6 then exit
after "ours" is emptied. There'll be only a handful of objects to
walk in fast-forward case. If it's forced update, we may need to
walk to the bottom.
3) the sender has same .git/shallow as the receiver
This is similar to case 2 except that "ours" should be emptied at
step 2 and exit early.
A fetch after "clone --depth=X" is case 1. A fetch after "clone" (from
a shallow repo) is case 3. Luckily they're cheap for the common case.
A push from "clone --depth=X" falls into case 2, which is expensive.
Some more work may be done at the sender/client side to avoid more
work on the server side: if the transferred pack does not contain any
shallow commits, send-pack should not send any shallow commits to the
receive-pack, effectively turning it into a normal push and avoid all
steps.
This patch implements all steps except #3, already handled by
fetch-pack and receive-pack, #6 and #7, which has their own patch due
to their size.
(*) in previous versions step 7 was put before step 3. I reorder it so
that the common case that keeps the pack does not need to walk
commits at all. In future if we implement faster commit
reachability check (maybe with the help of pack bitmaps or commit
cache), step 7 could become cheap and be moved up before 6 again.
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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No callers pass a non-empty pointer as shallow_points at this
stage. As a result, all clients still refuse to talk to shallow
repository on the other end.
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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If either receive-pack or upload-pack is called on a shallow
repository, shallow commits (*) will be sent after the ref
advertisement (but before the packet flush), so that the receiver has
the full "shape" of the sender's commit graph. This will be needed for
the receiver to update its .git/shallow if necessary.
This breaks the protocol for all clients trying to push to a shallow
repo, or fetch from one. Which is basically the same end result as
today's "is_repository_shallow() && die()" in receive-pack and
upload-pack. New clients will be made aware of shallow upstream and
can make use of this information.
The sender must send all shallow commits that are sent in the
following pack. It may send more shallow commits than necessary.
upload-pack for example may choose to advertise no shallow commits if
it knows in advance that the pack it's going to send contains no
shallow commits. But upload-pack is the server, so we choose the
cheaper way, send full .git/shallow and let the client deal with it.
Smart HTTP is not affected by this patch. Shallow support on
smart-http comes later separately.
(*) A shallow commit is a commit that terminates the revision
walker. It is usually put in .git/shallow in order to keep the
revision walker from going out of bound because there is no
guarantee that objects behind this commit is available.
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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If we borrow objects from another repository, we should also pay
attention to their $GIT_DIR/shallow (and even info/grafts). But
current alternates code does not.
Reject alternate repos that are shallow because we do not do it
right. In future the alternate code may be updated to check
$GIT_DIR/shallow properly so that this restriction could be lifted.
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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send-pack can send a pack with loose ends to the server. receive-pack
before 6d4bb38 (fetch: verify we have everything we need before
updating our ref - 2011-09-01) does not detect this and keeps the pack
anyway, which corrupts the repository, at least from fsck point of
view.
send-pack will learn to safely push from a shallow repository later.
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The latter can do everything the former can and is used in many more
places.
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Signed-off-by: Junio C Hamano <gitster@pobox.com>
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* maint:
remote-hg: don't decode UTF-8 paths into Unicode objects
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The internal mercurial API expects ordinary 8-bit string objects, not
Unicode string objects. With this change, the test-hg.sh unit tests
pass again.
Signed-off-by: Richard Hansen <rhansen@bbn.com>
Reviewed-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Unbreaks a recent breakage due to use of unquote-c-style.
This may need to be cherry-picked down to 1.8.4.x series.
* 'rh/remote-hg-bzr-updates' (early part):
remote-hg: don't decode UTF-8 paths into Unicode objects
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The internal mercurial API expects ordinary 8-bit string objects, not
Unicode string objects. With this change, the test-hg.sh unit tests
pass again.
Signed-off-by: Richard Hansen <rhansen@bbn.com>
Reviewed-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Signed-off-by: Junio C Hamano <gitster@pobox.com>
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* mb/relnotes-1.8.5-fix:
RelNotes: spelling & grammar fixes
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Signed-off-by: Marc Branchaud <marcnarc@xiplink.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Fixes a regression on 'master' since v1.8.4.
* nd/literal-pathspecs:
pathspec: stop --*-pathspecs impact on internal parse_pathspec() uses
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Normally parse_pathspec() is used on command line arguments where it
can do fancy thing like parsing magic on each argument or adding magic
for all pathspecs based on --*-pathspecs options.
There's another use of parse_pathspec(), where pathspec is needed, but
the input is known to be pure paths. In this case we usually don't
want --*-pathspecs to interfere. And we definitely do not want to
parse magic in these paths, regardless of --literal-pathspecs.
Add new flag PATHSPEC_LITERAL_PATH for this purpose. When it's set,
--*-pathspecs are ignored, no magic is parsed. And if the caller
allows PATHSPEC_LITERAL (i.e. the next calls can take literal magic),
then PATHSPEC_LITERAL will be set.
This fixes cases where git chokes when GIT_*_PATHSPECS are set because
parse_pathspec() indicates it won't take any magic. But
GIT_*_PATHSPECS add them anyway. These are
export GIT_LITERAL_PATHSPECS=1
git blame -- something
git log --follow something
git log --merge
"git ls-files --with-tree=path" (aka parse_pathspec() in
overlay_tree_on_cache()) is safe because the input is empty, and
producing one pathspec due to PATHSPEC_PREFER_CWD does not take any
magic into account.
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Acked-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Hotfix for recent regression while talking to upload-pack
in a repository with many symbolic refs.
* maint:
Revert "upload-pack: send non-HEAD symbolic refs"
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This reverts commit 5e7dcad771cb873e278a0571b46910d7c32e2f6c; there
may be unbounded number of symbolic refs in the repository, but the
capability header line in the on-wire protocol has a rather low
length limit.
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Hot-fix for a regression.
* jx/branch-vv-always-compare-with-upstream:
branch: fix --verbose output column alignment
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Commit f2e0873 (branch: report invalid tracking branch as gone) removed
an early return from fill_tracking_info() in the path taken when 'git
branch -v' lists a branch in sync with its upstream. This resulted in an
unconditionally added space in front of the subject line:
$ git branch -v
* master f5eb3da commit pushed to upstream
topic f935eb6 unpublished topic
Instead, only add the trailing space if a decoration have been added.
To catch this kind of whitespace breakage in the tests, be a bit less
smart when filtering the output through sed.
Signed-off-by: Torstein Hegge <hegge@resisty.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Signed-off-by: Junio C Hamano <gitster@pobox.com>
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* git://github.com/git-l10n/git-po:
l10n: de.po: improve error message when pushing to unknown upstream
l10n: de.po: translate 68 new messages
po/TEAMS: update Thomas Rast's email address
l10n: Update Swedish translation (2194t0f0u)
l10n: fr.po 2194/1294 messages translated
l10n: zh_CN.po: translate 68 messages (2194t0f0u)
l10n: vi.po (2194t): Update and minor fix
l10n: git.pot: v1.8.5 round 1 (68 new, 9 removed)
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Signed-off-by: Ralf Thielow <ralf.thielow@gmail.com>
Acked-by: Thomas Rast <tr@thomasrast.ch>
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Translate 68 new messages came from git.pot update in 727b957
(l10n: git.pot: v1.8.5 round 1 (68 new, 9 removed)).
Signed-off-by: Ralf Thielow <ralf.thielow@gmail.com>
Acked-by: Thomas Rast <tr@thomasrast.ch>
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Signed-off-by: Ralf Thielow <ralf.thielow@gmail.com>
Acked-by: Thomas Rast <tr@thomasrast.ch>
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* sv/nafmo/master:
l10n: Update Swedish translation (2194t0f0u)
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And fix a typo.
Signed-off-by: Peter Krefting <peter@softwolves.pp.se>
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Signed-off-by: Jean-Noel Avila <jn.avila@free.fr>
Signed-off-by: Sebastien Helleu <flashcode@flashtux.org>
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Translate 68 new messages came from git.pot update in 727b957
(l10n: git.pot: v1.8.5 round 1 (68 new, 9 removed)).
Signed-off-by: Jiang Xin <worldhello.net@gmail.com>
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Signed-off-by: Tran Ngoc Quan <vnwildman@gmail.com>
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Generate po/git.pot from v1.8.5-rc0-23-gaa27064 for git v1.8.5
l10n round 1.
Signed-off-by: Jiang Xin <worldhello.net@gmail.com>
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"timezone" is two words, not one (i.e. "time zone" is correct).
Correct this in these files:
-- date-formats.txt
-- git-blame.txt
-- git-cvsimport.txt
-- git-fast-import.txt
-- git-svn.txt
-- gitweb.conf.txt
-- rev-list-options.txt
Signed-off-by: Jason St. John <jstjohn@purdue.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The interaction between use of Perl in our test suite and NO_PERL
has been clarified a bit.
* jn/test-prereq-perl-doc:
t/README: tests can use perl even with NO_PERL
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A fast-import stream expresses a pathname with funny characters by
quoting them in C style; remote-hg remote helper (in contrib/)
forgot to unquote such a path.
* ap/remote-hg-unquote-cquote:
remote-hg: unquote C-style paths when exporting
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One long-standing flaw in the pack transfer protocol used by "git
clone" was that there was no way to tell the other end which branch
"HEAD" points at, and the receiving end needed to guess. A new
capability has been defined in the pack protocol to convey this
information so that cloning from a repository with more than one
branches pointing at the same commit where the HEAD is at now
reliably sets the initial branch in the resulting repository.
* jc/upload-pack-send-symref:
t5570: Update for clone-progress-to-stderr branch
t5570: Update for symref capability
clone: test the new HEAD detection logic
connect: annotate refs with their symref information in get_remote_head()
connect.c: make parse_feature_value() static
upload-pack: send non-HEAD symbolic refs
upload-pack: send symbolic ref information as capability
upload-pack.c: do not pass confusing cb_data to mark_our_ref()
t5505: fix "set-head --auto with ambiguous HEAD" test
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We did not handle cases where http transport gets redirected during
the authorization request (e.g. from http:// to https://).
* jk/http-auth-redirects:
http.c: Spell the null pointer as NULL
remote-curl: rewrite base url from info/refs redirects
remote-curl: store url as a strbuf
remote-curl: make refs_url a strbuf
http: update base URLs when we see redirects
http: provide effective url to callers
http: hoist credential request out of handle_curl_result
http: refactor options to http_get_*
http_request: factor out curlinfo_strbuf
http_get_file: style fixes
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* maint:
Start preparing for 1.8.4.3
gitignore.txt: fix documentation of "**" patterns
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Signed-off-by: Junio C Hamano <gitster@pobox.com>
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An ancient How-To on serving Git repositories on an HTTP server
lacked a warning that it has been mostly superseded with more
modern way.
* sc/doc-howto-dumb-http:
doc/howto: warn about (dumb)http server document being too old
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The synopsis section of "git unpack-objects" documentation has been
clarified a bit.
* vd/doc-unpack-objects:
Documentation: "pack-file" is not literal in unpack-objects
Documentation: restore a space in unpack-objects usage
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We did not generate HTML version of documentation to "git subtree"
in contrib/.
* jk/subtree-install-fix:
subtree: add makefile target for html docs
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Coloring around octopus merges in "log --graph" output was screwy.
* hn/log-graph-color-octopus:
graph: fix coloring around octopus merges
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"git checkout topic", when there is not yet a local "topic" branch
but there is a unique remote-tracking branch for a remote "topic"
branch, pretended as if "git checkout -t -b topic remote/$r/topic"
(for that unique remote $r) was run. This hack however was not
implemented for "git checkout topic --".
* mm/checkout-auto-track-fix:
checkout: proper error message on 'git checkout foo bar --'
checkout: allow dwim for branch creation for "git checkout $branch --"
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Bash prompting code to deal with an SVN remote as an upstream
were coded in a way not supported by older Bash versions (3.x).
* sg/prompt-svn-remote-fix:
bash prompt: don't use '+=' operator in show upstream code path
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