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Jeff King cff38a5e11 receive-pack: eliminate duplicate .have refs 
When receiving a push, we advertise ref tips from any
alternate repositories, in case that helps the client send a
smaller pack. Since these refs don't actually exist in the
destination repository, we don't transmit the real ref
names, but instead use the pseudo-ref ".have".

If your alternate has a large number of duplicate refs (for
example, because it is aggregating objects from many related
repositories, some of which will have the same tags and
branch tips), then we will send each ".have $sha1" line
multiple times. This is a pointless waste of bandwidth, as
we are simply repeating the same fact to the client over and
over.

This patch eliminates duplicate .have refs early on. It does
so efficiently by sorting the complete list and skipping
duplicates. This has the side effect of re-ordering the
.have lines by ascending sha1; this isn't a problem, though,
as the original order was meaningless.

There is a similar .have system in fetch-pack, but it
does not suffer from the same problem. For each alternate
ref we consider in fetch-pack, we actually open the object
and mark it with the SEEN flag, so duplicates are
automatically culled.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-05-19 20:02:31 -07:00
..
add.c Merge branch 'jc/fix-add-u-unmerged' into maint 2011-05-16 16:37:33 -07:00
annotate.c
apply.c Merge branch 'jc/maint-add-p-overlapping-hunks' into maint 2011-05-16 16:36:46 -07:00
archive.c i18n: git-archive basic messages 2011-03-09 23:52:57 -08:00
bisect--helper.c
blame.c blame: tolerate bogus e-mail addresses a bit better 2011-04-29 11:09:42 -07:00
branch.c Merge branch 'ab/i18n-st' 2011-04-01 17:55:55 -07:00
bundle.c i18n: git-bundle basic messages 2011-03-09 23:52:57 -08:00
cat-file.c blame,cat-file --textconv: Don't assume mode is ``S_IFREF | 0664'' 2010-09-29 16:53:25 -07:00
check-attr.c
check-ref-format.c Allow "check-ref-format --branch" from subdirectory 2010-08-06 10:01:45 -07:00
checkout-index.c Merge branch 'jn/git-cmd-h-bypass-setup' 2010-12-12 21:49:50 -08:00
checkout.c Merge branch 'ab/i18n-st' 2011-04-01 17:55:55 -07:00
clean.c i18n: git-clean clean.requireForce messages 2011-03-09 23:52:57 -08:00
clone.c Merge branch 'nd/init-gitdir' 2011-04-01 17:57:37 -07:00
commit-tree.c Sync with 1.7.3.2 2010-10-21 17:16:10 -07:00
commit.c Merge branch 'jc/index-update-if-able' into maint 2011-04-03 12:33:05 -07:00
config.c Merge branch 'lp/config-vername-check' into maint 2011-04-03 12:29:45 -07:00
count-objects.c add description parameter to OPT__VERBOSE 2010-11-15 09:56:51 -08:00
describe.c Merge branch 'lt/default-abbrev' into maint 2011-04-03 12:32:51 -07:00
diff-files.c Convert struct diff_options to use struct pathspec 2011-02-03 12:28:15 -08:00
diff-index.c Submodules: Use "ignore" settings from .gitmodules too for diff and status 2010-08-09 09:11:44 -07:00
diff-tree.c Submodules: Use "ignore" settings from .gitmodules too for diff and status 2010-08-09 09:11:44 -07:00
diff.c Merge branch 'jc/index-update-if-able' into maint 2011-04-03 12:33:05 -07:00
fast-export.c Merge branch 'mg/placeholders-are-lowercase' 2011-02-27 21:58:30 -08:00
fetch-pack.c refactor refs_from_alternate_cb to allow passing extra data 2011-05-19 20:01:10 -07:00
fetch.c Merge branch 'jl/submodule-fetch-on-demand' 2011-04-04 15:02:01 -07:00
fmt-merge-msg.c Fix sparse warnings 2011-03-22 10:16:54 -07:00
for-each-ref.c for-each-ref: fix objectname:short bug 2010-08-26 16:42:25 -07:00
fsck.c Remove unused variables 2011-03-22 11:43:27 -07:00
gc.c i18n: git-gc "Auto packing the repository" message 2011-03-09 23:52:57 -08:00
grep.c sparse: Fix errors and silence warnings 2011-04-03 10:14:53 -07:00
hash-object.c Fix sparse warnings 2011-03-22 10:16:54 -07:00
help.c Cast execl*() NULL sentinels to (char *) 2010-07-25 23:14:18 -07:00
index-pack.c sparse: Fix errors and silence warnings 2011-04-03 10:14:53 -07:00
init-db.c Merge branch 'nd/init-gitdir' 2011-04-01 17:57:37 -07:00
log.c Merge branch 'cn/format-patch-quiet' into maint 2011-05-15 16:10:49 -07:00
ls-files.c Merge branch 'jn/git-cmd-h-bypass-setup' 2010-12-12 21:49:50 -08:00
ls-remote.c get_remote_url(): use the same data source as ls-remote to get remote urls 2011-03-02 12:26:53 -08:00
ls-tree.c Use angles for placeholders consistently 2010-10-08 12:29:52 -07:00
mailinfo.c commit: helper methods to reduce redundant blocks of code 2010-11-04 13:53:34 -07:00
mailsplit.c Use parentheses and `...' where appropriate 2010-10-08 12:31:07 -07:00
merge-base.c Documentation: update to git-merge-base --octopus 2011-04-15 10:13:52 -07:00
merge-file.c Merge branch 'rs/opt-help-text' 2010-11-24 15:55:19 -08:00
merge-index.c Fix sparse warnings 2011-03-22 10:16:54 -07:00
merge-ours.c
merge-recursive.c Fix sparse warnings 2011-03-22 10:16:54 -07:00
merge-tree.c Fix sparse warnings 2011-03-22 10:16:54 -07:00
merge.c Merge branch 'jc/maint-branch-mergeoptions' into maint 2011-05-16 16:37:07 -07:00
mktag.c Merge branch 'jn/maint-c99-format' 2011-03-23 14:55:46 -07:00
mktree.c
mv.c i18n: git-mv "bad" messages 2011-03-09 23:52:56 -08:00
name-rev.c object.h: Add OBJECT_ARRAY_INIT macro and make use of it. 2010-08-29 22:42:49 -07:00
notes.c Merge branch 'ab/i18n-st' 2011-04-01 17:55:55 -07:00
pack-objects.c Teach core.bigfilethreashold to pack-objects 2011-04-05 20:25:49 -07:00
pack-redundant.c Fix sparse warnings 2011-03-22 10:16:54 -07:00
pack-refs.c Fix sparse warnings 2011-03-22 10:16:54 -07:00
patch-id.c Fix sparse warnings 2011-03-22 10:16:54 -07:00
prune-packed.c
prune.c add description parameter to OPT__DRY_RUN 2010-11-15 09:57:37 -08:00
push.c Merge branch 'ab/i18n-st' 2011-04-01 17:55:55 -07:00
read-tree.c Make <identifier> lowercase as per CodingGuidelines 2011-02-15 11:53:10 -08:00
receive-pack.c receive-pack: eliminate duplicate .have refs 2011-05-19 20:02:31 -07:00
reflog.c Merge branch 'jc/maint-no-reflog-expire-unreach-for-head' 2010-05-21 04:02:18 -07:00
remote-ext.c Remove unused variables 2011-03-22 11:43:27 -07:00
remote-fd.c Fix sparse warnings 2011-03-22 10:16:54 -07:00
remote.c Merge branch 'jk/maint-remote-mirror-safer' 2011-04-06 10:38:14 -07:00
replace.c
rerere.c rerere forget: deprecate invocation without pathspec 2011-03-02 12:26:18 -08:00
reset.c Merge branch 'ab/i18n-st' 2011-04-01 17:55:55 -07:00
rev-list.c revision.c: introduce --min-parents and --max-parents options 2011-03-23 10:16:44 -07:00
rev-parse.c revision.c: introduce --min-parents and --max-parents options 2011-03-23 10:16:44 -07:00
revert.c revert: Hide '-r' option in default usage 2011-04-13 11:02:49 -07:00
rm.c i18n: git-rm basic messages 2011-03-09 23:52:56 -08:00
send-pack.c Fix sparse warnings 2011-03-22 10:16:54 -07:00
shortlog.c i18n: git-shortlog basic messages 2011-03-09 23:52:58 -08:00
show-branch.c commit: Add commit_list prefix in two function names. 2010-11-29 14:01:52 -08:00
show-ref.c Describe various forms of "be quiet" using OPT__QUIET 2010-11-15 10:04:56 -08:00
stripspace.c
symbolic-ref.c Describe various forms of "be quiet" using OPT__QUIET 2010-11-15 10:04:56 -08:00
tag.c Merge branch 'ab/i18n-st' 2011-04-01 17:55:55 -07:00
tar-tree.c
unpack-file.c Fix sparse warnings 2011-03-22 10:16:54 -07:00
unpack-objects.c do not depend on signed integer overflow 2010-10-06 11:10:07 -07:00
update-index.c Convert ce_path_match() to use struct pathspec 2011-02-03 14:08:30 -08:00
update-ref.c
update-server-info.c add OPT__FORCE 2010-11-15 10:04:43 -08:00
upload-archive.c
var.c Fix sparse warnings 2011-03-22 10:16:54 -07:00
verify-pack.c
verify-tag.c Merge branch 'mg/maint-tag-rfc1991' 2010-12-08 11:24:13 -08:00
write-tree.c