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Junio C Hamano ec7dbd145b receive-pack: allow hooks to ignore its standard input stream 
The pre-receive and post-receive hooks were designed to be an
improvement over old style update and post-update hooks, which take
the update information on their command line and are limited by the
command line length limit.  The same information is fed from the
standard input to pre/post-receive hooks instead to lift this
limitation.  It has been mandatory for these new style hooks to
consume the update information fully from the standard input stream.
Otherwise, they would risk killing the receive-pack process via
SIGPIPE.

If a hook does not want to look at all the information, it is easy
to send its standard input to /dev/null (perhaps a niche use of hook
might need to know only the fact that a push was made, without
having to know what objects have been pushed to update which refs),
and this has already been done by existing hooks that are written
carefully.

However, because there is no good way to consistently fail hooks
that do not consume the input fully (a small push may result in a
short update record that may fit within the pipe buffer, to which
the receive-pack process may manage to write before the hook has a
chance to exit without reading anything, which will not result in a
death-by-SIGPIPE of receive-pack), it can lead to a hard to diagnose
"once in a blue moon" phantom failure.

Lift this "hooks must consume their input fully" mandate.  A mandate
that is not enforced strictly is not helping us to catch mistakes in
hooks.  If a hook has a good reason to decide the outcome of its
operation without reading the information we feed it, let it do so
as it pleases.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
2014-09-16 15:11:58 -07:00
..
add.c read-cache: new API write_locked_index instead of write_index/write_cache 2014-06-13 11:49:10 -07:00
annotate.c annotate: use argv_array 2014-07-16 11:10:11 -07:00
apply.c Merge branch 'jk/misc-fixes-maint' 2014-07-28 11:30:41 -07:00
archive.c replace {pre,suf}fixcmp() with {starts,ends}_with() 2013-12-05 14:13:21 -08:00
bisect--helper.c Replace deprecated OPT_BOOLEAN by OPT_BOOL 2013-08-05 11:32:19 -07:00
blame.c Merge branch 'rs/code-cleaning' 2014-07-22 10:59:37 -07:00
branch.c refactor skip_prefix to return a boolean 2014-06-20 10:44:43 -07:00
bundle.c
cat-file.c Merge branch 'jk/warn-on-object-refname-ambiguity' 2014-03-25 11:07:36 -07:00
check-attr.c Merge branch 'jc/check-attr-honor-working-tree' into maint 2014-03-18 14:03:03 -07:00
check-ignore.c Merge branch 'dw/check-ignore-sans-index' 2013-09-20 12:37:32 -07:00
check-mailmap.c builtin: add git-check-mailmap command 2013-07-13 10:19:37 -07:00
check-ref-format.c
checkout-index.c entry.c: update cache_changed if refresh_cache is set in checkout_entry() 2014-06-13 11:49:39 -07:00
checkout.c Merge branch 'nd/split-index' 2014-07-16 11:25:40 -07:00
clean.c use xcalloc() to allocate zero-initialized memory 2014-07-21 10:30:21 -07:00
clone.c use local cloning if insteadOf makes a local URL 2014-07-17 11:17:13 -07:00
column.c replace {pre,suf}fixcmp() with {starts,ends}_with() 2013-12-05 14:13:21 -08:00
commit-tree.c commit_tree: take a pointer/len pair rather than a const strbuf 2014-06-12 10:29:41 -07:00
commit.c Merge branch 'ta/string-list-init' 2014-07-23 11:35:54 -07:00
config.c Merge branch 'jk/daemon-tolower' 2014-06-16 10:07:15 -07:00
count-objects.c
credential.c
describe.c hashmap: add simplified hashmap_get_from_hash() API 2014-07-07 13:56:35 -07:00
diff-files.c convert read_cache_preload() to take struct pathspec 2013-07-15 10:56:08 -07:00
diff-index.c convert read_cache_preload() to take struct pathspec 2013-07-15 10:56:08 -07:00
diff-tree.c Merge branch 'jk/alloc-commit-id' 2014-07-22 10:59:25 -07:00
diff.c Merge branch 'tg/diff-no-index-refactor' 2013-12-27 14:58:17 -08:00
fast-export.c Merge branch 'jk/commit-buffer-length' 2014-07-02 12:53:02 -07:00
fetch-pack.c Merge branch 'nd/shallow-clone' 2014-01-17 12:21:20 -08:00
fetch.c Merge branch 'jk/xstrfmt' 2014-07-09 11:34:05 -07:00
fmt-merge-msg.c Merge branch 'jk/xstrfmt' 2014-07-09 11:34:05 -07:00
for-each-ref.c use commit_list_count() to count the members of commit_lists 2014-07-17 13:36:25 -07:00
fsck.c refs.c: add a public is_branch function 2014-07-16 13:06:41 -07:00
gc.c Merge branch 'nd/daemonize-gc' into maint 2014-06-25 11:47:36 -07:00
get-tar-commit-id.c stop installing git-tar-tree link 2013-12-03 12:35:22 -08:00
grep.c Merge branch 'sk/spawn-less-case-insensitively-from-grep-O-i' into maint 2014-06-25 11:47:49 -07:00
hash-object.c hash-object: replace stdin parsing OPT_BOOLEAN by OPT_COUNTUP 2013-08-07 08:30:55 -07:00
help.c builtin/help.c: speed up is_git_command() by checking for builtin commands first 2014-01-06 11:26:31 -08:00
index-pack.c Merge branch 'maint' 2014-07-21 12:35:39 -07:00
init-db.c i18n: only extract comments marked with "TRANSLATORS:" 2014-04-17 11:09:56 -07:00
log.c Merge branch 'jk/commit-buffer-length' into maint 2014-07-16 11:16:38 -07:00
ls-files.c pathspec: pass directory indicator to match_pathspec_item() 2014-02-24 14:37:19 -08:00
ls-remote.c builtin/ls-remote.c: rearrange xcalloc arguments 2014-05-27 14:00:43 -07:00
ls-tree.c pathspec: rename match_pathspec_depth() to match_pathspec() 2014-02-24 14:37:14 -08:00
mailinfo.c Merge branch 'rs/mailinfo-header-cmp' into maint 2014-06-25 11:48:23 -07:00
mailsplit.c
merge-base.c Merge branch 'bm/merge-base-octopus-dedup' into maint 2014-02-13 13:38:59 -08:00
merge-file.c Replace deprecated OPT_BOOLEAN by OPT_BOOL 2013-08-05 11:32:19 -07:00
merge-index.c Convert "struct cache_entry *" to "const ..." wherever possible 2013-07-09 09:12:48 -07:00
merge-ours.c
merge-recursive.c replace {pre,suf}fixcmp() with {starts,ends}_with() 2013-12-05 14:13:21 -08:00
merge-tree.c
merge.c Merge branch 'rs/code-cleaning' 2014-07-16 11:33:09 -07:00
mktag.c
mktree.c builtin/mktree.c: use ALLOC_GROW() in append_to_tree() 2014-03-03 14:54:45 -08:00
mv.c Merge branch 'nd/split-index' 2014-07-16 11:25:40 -07:00
name-rev.c use xstrfmt to replace xmalloc + strcpy/strcat 2014-06-19 15:20:54 -07:00
notes.c Merge branch 'mh/ref-transaction' 2014-06-03 12:06:41 -07:00
pack-objects.c Merge branch 'jk/pack-shallow-always-without-bitmap' 2014-08-26 11:16:25 -07:00
pack-redundant.c
pack-refs.c
patch-id.c patch-id: make it stable against hunk reordering 2014-06-10 13:09:24 -07:00
prune-packed.c i18n: mark all progress lines for translation 2014-02-24 09:08:37 -08:00
prune.c Merge branch 'mh/replace-refs-variable-rename' 2014-03-14 14:27:06 -07:00
push.c refactor skip_prefix to return a boolean 2014-06-20 10:44:43 -07:00
read-tree.c read-tree: note about dropping split-index mode or index version 2014-06-13 11:49:41 -07:00
receive-pack.c receive-pack: allow hooks to ignore its standard input stream 2014-09-16 15:11:58 -07:00
reflog.c refs.c: add new functions reflog_exists and delete_reflog 2014-05-08 14:31:43 -07:00
remote-ext.c
remote-fd.c
remote.c Merge branch 'rs/ref-transaction-0' 2014-07-21 11:18:37 -07:00
repack.c Merge branch 'jk/strip-suffix' 2014-07-16 11:26:00 -07:00
replace.c Merge branch 'cc/replace-graft' 2014-07-27 15:14:18 -07:00
rerere.c rerere: fix for merge.conflictstyle 2014-04-30 10:30:02 -07:00
reset.c Merge branch 'nd/split-index' 2014-07-16 11:25:40 -07:00
rev-list.c commit: record buffer length in cache 2014-06-13 12:09:38 -07:00
rev-parse.c Merge branch 'jk/misc-fixes-maint' 2014-07-28 11:30:41 -07:00
revert.c parse-options: multi-word argh should use dash to separate words 2014-03-24 10:43:34 -07:00
rm.c read-cache: new API write_locked_index instead of write_index/write_cache 2014-06-13 11:49:10 -07:00
send-pack.c Merge branch 'nd/shallow-clone' 2014-01-17 12:21:20 -08:00
shortlog.c replace {pre,suf}fixcmp() with {starts,ends}_with() 2013-12-05 14:13:21 -08:00
show-branch.c Merge branch 'jk/misc-fixes-maint' 2014-07-28 11:30:41 -07:00
show-ref.c replace {pre,suf}fixcmp() with {starts,ends}_with() 2013-12-05 14:13:21 -08:00
stripspace.c builtin/stripspace.c: fix broken indentation 2013-09-06 13:33:17 -07:00
symbolic-ref.c replace {pre,suf}fixcmp() with {starts,ends}_with() 2013-12-05 14:13:21 -08:00
tag.c Merge branch 'jk/tag-sort' 2014-07-23 11:35:45 -07:00
unpack-file.c
unpack-objects.c Merge branch 'mh/replace-refs-variable-rename' 2014-03-14 14:27:06 -07:00
update-index.c Merge branch 'nd/split-index' 2014-07-16 11:25:40 -07:00
update-ref.c refs.c: change ref_transaction_update() to do error checking and return status 2014-07-14 11:54:42 -07:00
update-server-info.c
upload-archive.c replace {pre,suf}fixcmp() with {starts,ends}_with() 2013-12-05 14:13:21 -08:00
var.c
verify-commit.c verify-commit: scriptable commit signature verification 2014-06-23 15:50:31 -07:00
verify-pack.c verify-pack: use strbuf_strip_suffix 2014-06-30 13:43:32 -07:00
verify-tag.c
write-tree.c