Merge branch 'maint-1.7.11' into maint

* maint-1.7.11:
  Prepare for 1.7.11.6
  Make the ciabot scripts completely self-configuring in the normal case.
  Improved documentation for the ciabot scripts.
  man: git pull -r is a short for --rebase
  gitcli: describe abbreviation of long options
  rev-list docs: clarify --topo-order description
  Documentation/CodingGuidelines: spell out more shell guidelines
  Documentation: do not mention .git/refs/* directories
  tests: Introduce test_seq

19 files changed, 231 insertions, 48 deletions

diff --git a/Documentation/CodingGuidelines b/Documentation/CodingGuidelines
index 45577117c2..57da6aadeb 100644
--- a/Documentation/CodingGuidelines
+++ b/Documentation/CodingGuidelines
@@ -76,11 +76,19 @@ For shell scripts specifically (not exhaustive):
 
  - We do not use Process Substitution <(list) or >(list).
 
+ - Do not write control structures on a single line with semicolon.
+   "then" should be on the next line for if statements, and "do"
+   should be on the next line for "while" and "for".
+
  - We prefer "test" over "[ ... ]".
 
  - We do not write the noiseword "function" in front of shell
    functions.
 
+ - We prefer a space between the function name and the parentheses. The
+   opening "{" should also be on the same line.
+   E.g.: my_function () {
+
  - As to use of grep, stick to a subset of BRE (namely, no \{m,n\},
    [::], [==], nor [..]) for portability.
 
diff --git a/Documentation/RelNotes/1.7.11.6.txt b/Documentation/RelNotes/1.7.11.6.txt
new file mode 100644
index 0000000000..e548a59824
--- /dev/null
+++ b/Documentation/RelNotes/1.7.11.6.txt
@@ -0,0 +1,34 @@
+Git v1.7.11.6 Release Notes
+===========================
+
+Fixes since v1.7.11.5
+---------------------
+
+This is primarily documentation and low-impact code clarification.
+
+ - "ciabot" script (in contrib/) has been updated with extensive
+   documentation.
+
+ - The "--rebase" option to "git pull" can be abbreviated to "-r",
+   but we didn't document it.
+
+ - It was generally understood that "--long-option"s to many of our
+   subcommands can be abbreviated to the unique prefix, but it was not
+   easy to find it described for new readers of the documentation set.
+
+ - The "--topo-order", "--date-order" (and the lack of either means
+   the default order) options to "rev-list" and "log" family of
+   commands were poorly described in the documentation.
+
+ - Older parts of the documentation described as if having a regular
+   file in .git/refs/ hierarchy were the only way to have branches and
+   tags, which is not true for quite some time.
+
+ - A utility shell function test_seq has been added as a replacement
+   for the 'seq' utility found on some platforms.
+
+ - Fallback 'getpass' implementation made unportable use of stdio API.
+
+ - "git commit --amend" let the user edit the log message and then
+   died when the human-readable committer name was given
+   insufficiently by getpwent(3).
diff --git a/Documentation/git-describe.txt b/Documentation/git-describe.txt
index 039cce2e98..72d6bb612b 100644
--- a/Documentation/git-describe.txt
+++ b/Documentation/git-describe.txt
@@ -36,12 +36,12 @@ OPTIONS
 
 --all::
 	Instead of using only the annotated tags, use any ref
-	found in `.git/refs/`.  This option enables matching
+	found in `refs/` namespace.  This option enables matching
 	any known branch, remote-tracking branch, or lightweight tag.
 
 --tags::
 	Instead of using only the annotated tags, use any tag
-	found in `.git/refs/tags`.  This option enables matching
+	found in `refs/tags` namespace.  This option enables matching
 	a lightweight (non-annotated) tag.
 
 --contains::
diff --git a/Documentation/git-filter-branch.txt b/Documentation/git-filter-branch.txt
index 81f58234a7..15e7ac80c0 100644
--- a/Documentation/git-filter-branch.txt
+++ b/Documentation/git-filter-branch.txt
@@ -32,7 +32,8 @@ changes, which would normally have no effect.  Nevertheless, this may be
 useful in the future for compensating for some git bugs or such,
 therefore such a usage is permitted.
 
-*NOTE*: This command honors `.git/info/grafts` and `.git/refs/replace/`.
+*NOTE*: This command honors `.git/info/grafts` file and refs in
+the `refs/replace/` namespace.
 If you have any grafts or replacement refs defined, running this command
 will make them permanent.
 
diff --git a/Documentation/git-fsck.txt b/Documentation/git-fsck.txt
index bbb25da2dd..da348fc942 100644
--- a/Documentation/git-fsck.txt
+++ b/Documentation/git-fsck.txt
@@ -23,8 +23,8 @@ OPTIONS
 	An object to treat as the head of an unreachability trace.
 +
 If no objects are given, 'git fsck' defaults to using the
-index file, all SHA1 references in .git/refs/*, and all reflogs (unless
---no-reflogs is given) as heads.
+index file, all SHA1 references in `refs` namespace, and all reflogs
+(unless --no-reflogs is given) as heads.
 
 --unreachable::
 	Print out objects that exist but that aren't reachable from any
diff --git a/Documentation/git-lost-found.txt b/Documentation/git-lost-found.txt
index c406a11001..d54932889f 100644
--- a/Documentation/git-lost-found.txt
+++ b/Documentation/git-lost-found.txt
@@ -48,7 +48,8 @@ $ gitk $(cd .git/lost-found/commit && echo ??*)
 ------------
 
 After making sure you know which the object is the tag you are looking
-for, you can reconnect it to your regular .git/refs hierarchy.
+for, you can reconnect it to your regular `refs` hierarchy by using
+the `update-ref` command.
 
 ------------
 $ git cat-file -t 1ef2b196
diff --git a/Documentation/git-pack-refs.txt b/Documentation/git-pack-refs.txt
index 10afd4edfe..f131677478 100644
--- a/Documentation/git-pack-refs.txt
+++ b/Documentation/git-pack-refs.txt
@@ -14,7 +14,8 @@ DESCRIPTION
 -----------
 
 Traditionally, tips of branches and tags (collectively known as
-'refs') were stored one file per ref under `$GIT_DIR/refs`
+'refs') were stored one file per ref in a (sub)directory
+under `$GIT_DIR/refs`
 directory.  While many branch tips tend to be updated often,
 most tags and some branch tips are never updated.  When a
 repository has hundreds or thousands of tags, this
@@ -22,13 +23,14 @@ one-file-per-ref format both wastes storage and hurts
 performance.
 
 This command is used to solve the storage and performance
-problem by stashing the refs in a single file,
+problem by storing the refs in a single file,
 `$GIT_DIR/packed-refs`.  When a ref is missing from the
-traditional `$GIT_DIR/refs` hierarchy, it is looked up in this
+traditional `$GIT_DIR/refs` directory hierarchy, it is looked
+up in this
 file and used if found.
 
 Subsequent updates to branches always create new files under
-`$GIT_DIR/refs` hierarchy.
+`$GIT_DIR/refs` directory hierarchy.
 
 A recommended practice to deal with a repository with too many
 refs is to pack its refs with `--all --prune` once, and
@@ -57,6 +59,15 @@ a repository with many branches of historical interests.
 The command usually removes loose refs under `$GIT_DIR/refs`
 hierarchy after packing them.  This option tells it not to.
 
+
+BUGS
+----
+
+Older documentation written before the packed-refs mechanism was
+introduced may still say things like ".git/refs/heads/<branch> file
+exists" when it means "branch <branch> exists".
+
+
 GIT
 ---
 Part of the linkgit:git[1] suite
diff --git a/Documentation/git-pull.txt b/Documentation/git-pull.txt
index defb544ed0..67fa5ee195 100644
--- a/Documentation/git-pull.txt
+++ b/Documentation/git-pull.txt
@@ -101,6 +101,7 @@ include::merge-options.txt[]
 
 :git-pull: 1
 
+-r::
 --rebase::
 	Rebase the current branch on top of the upstream branch after
 	fetching.  If there is a remote-tracking branch corresponding to
diff --git a/Documentation/git-replace.txt b/Documentation/git-replace.txt
index 17df525275..51131d0858 100644
--- a/Documentation/git-replace.txt
+++ b/Documentation/git-replace.txt
@@ -14,14 +14,13 @@ SYNOPSIS
 
 DESCRIPTION
 -----------
-Adds a 'replace' reference in `.git/refs/replace/`
+Adds a 'replace' reference in `refs/replace/` namespace.
 
 The name of the 'replace' reference is the SHA1 of the object that is
 replaced. The content of the 'replace' reference is the SHA1 of the
 replacement object.
 
-Unless `-f` is given, the 'replace' reference must not yet exist in
-`.git/refs/replace/` directory.
+Unless `-f` is given, the 'replace' reference must not yet exist.
 
 Replacement references will be used by default by all git commands
 except those doing reachability traversal (prune, pack transfer and
diff --git a/Documentation/git-tag.txt b/Documentation/git-tag.txt
index e36a7c3d1e..247534e908 100644
--- a/Documentation/git-tag.txt
+++ b/Documentation/git-tag.txt
@@ -20,11 +20,10 @@ SYNOPSIS
 DESCRIPTION
 -----------
 
-Add a tag reference in `.git/refs/tags/`, unless `-d/-l/-v` is given
+Add a tag reference in `refs/tags/`, unless `-d/-l/-v` is given
 to delete, list or verify tags.
 
-Unless `-f` is given, the tag to be created must not yet exist in the
-`.git/refs/tags/` directory.
+Unless `-f` is given, the named tag must not yet exist.
 
 If one of `-a`, `-s`, or `-u <key-id>` is passed, the command
 creates a 'tag' object, and requires a tag message.  Unless
diff --git a/Documentation/gitcli.txt b/Documentation/gitcli.txt
index ea17f7a53b..3e72a5d68e 100644
--- a/Documentation/gitcli.txt
+++ b/Documentation/gitcli.txt
@@ -62,6 +62,14 @@ scripting git:
    `git log -1 HEAD` but write `git log -1 HEAD --`; the former will not work
    if you happen to have a file called `HEAD` in the work tree.
 
+ * many commands allow a long option "--option" to be abbreviated
+   only to their unique prefix (e.g. if there is no other option
+   whose name begins with "opt", you may be able to spell "--opt" to
+   invoke the "--option" flag), but you should fully spell them out
+   when writing your scripts; later versions of Git may introduce a
+   new option whose name shares the same prefix, e.g. "--optimize",
+   to make a short prefix that used to be unique no longer unique.
+
 
 ENHANCED OPTION PARSER
 ----------------------
diff --git a/Documentation/rev-list-options.txt b/Documentation/rev-list-options.txt
index d9b2b5b2e0..def1340ac7 100644
--- a/Documentation/rev-list-options.txt
+++ b/Documentation/rev-list-options.txt
@@ -578,16 +578,33 @@ Commit Ordering
 
 By default, the commits are shown in reverse chronological order.
 
---topo-order::
+--date-order::
+	Show no parents before all of its children are shown, but
+	otherwise show commits in the commit timestamp order.
 
-	This option makes them appear in topological order (i.e.
-	descendant commits are shown before their parents).
+--topo-order::
+	Show no parents before all of its children are shown, and
+	avoid showing commits on multiple lines of history
+	intermixed.
++
+For example, in a commit history like this:
++
+----------------------------------------------------------------
 
---date-order::
+    ---1----2----4----7
+	\	       \
+	 3----5----6----8---
 
-	This option is similar to '--topo-order' in the sense that no
-	parent comes before all of its children, but otherwise things
-	are still ordered in the commit timestamp order.
+----------------------------------------------------------------
++
+where the numbers denote the order of commit timestamps, `git
+rev-list` and friends with `--date-order` show the commits in the
+timestamp order: 8 7 6 5 4 3 2 1.
++
+With `--topo-order`, they would show 8 6 5 3 7 4 2 1 (or 8 7 4 2 6 5
+3 1); some older commits are shown before newer ones in order to
+avoid showing the commits from two parallel development track mixed
+together.
 
 --reverse::
 
diff --git a/contrib/ciabot/INSTALL b/contrib/ciabot/INSTALL
new file mode 100644
index 0000000000..7222961d35
--- /dev/null
+++ b/contrib/ciabot/INSTALL
@@ -0,0 +1,54 @@
+= Installation instructions =
+
+Two scripts are included.  The Python one (ciabot.py) is faster and
+more capable; the shell one (ciabot.sh) is a fallback in case Python
+gives your git hosting site indigestion. (I know of no such sites.)
+
+It is no longer necessary to modify the script in order to put it
+in place; in fact, this is now discouraged. It is entirely
+configurable with the following git config variables:
+
+ciabot.project = name of the project
+ciabot.repo = name of the project repo for gitweb/cgit purposes
+ciabot.xmlrpc  = if true, ship notifications via XML-RPC
+ciabot.revformat = format in which the revision is shown
+
+The revformat variable may have the following values
+raw -> full hex ID of commit
+short -> first 12 chars of hex ID
+describe -> describe relative to last tag, falling back to short
+
+ciabot.project defaults to the directory name of the repository toplevel.
+ciabot.repo defaults to ciabot.project lowercased.
+ciabot.xmlrpc defaults to True
+ciabot.revformat defaults to 'describe'.
+
+This means that in the normal case you need not do any configuration at all,
+however setting ciabot.project will allow the hook to run slightly faster.
+
+Once you've set these variables, try your script with -n to see the
+notification message dumped to stdout and verify that it looks sane.
+
+To live-test these scripts, your project needs to have been registered with
+the CIA site.  Here are the steps:
+
+1. Open an IRC window on irc://freenode/commits or your registered
+   project IRC channel.
+
+2. Run ciabot.py and/or ciabot.sh from any directory under git
+   control.
+
+You should see a notification on the channel for your most recent commit.
+
+After verifying correct function, install one of these scripts either
+in a post-commit hook or in an update hook.
+
+In post-commit, run it without arguments. It will query for
+current HEAD and the latest commit ID to get the information it
+needs.
+
+In update, call it with a refname followed by a list of commits:
+You want to reverse the order git rev-list emits because it lists
+from most recent to oldest.
+
+/path/to/ciabot.py ${refname} $(git rev-list ${oldhead}..${newhead} | tac)
diff --git a/contrib/ciabot/README b/contrib/ciabot/README
index 3b916acece..2dfe1f91f5 100644
--- a/contrib/ciabot/README
+++ b/contrib/ciabot/README
@@ -8,5 +8,4 @@ You probably want the Python version; it's faster, more capable, and
 better documented.  The shell version is maintained only as a fallback
 for use on hosting sites that don't permit Python hook scripts.
 
-You will find installation instructions for each script in its comment
-header.
+See the file INSTALL for installation instructions.
diff --git a/contrib/ciabot/ciabot.py b/contrib/ciabot/ciabot.py
index 8ce04eb9d2..bd24395d4c 100755
--- a/contrib/ciabot/ciabot.py
+++ b/contrib/ciabot/ciabot.py
@@ -10,11 +10,9 @@
 # usage: ciabot.py [-V] [-n] [-p projectname]  [refname [commits...]]
 #
 # This script is meant to be run either in a post-commit hook or in an
-# update hook.  If there's nothing unusual about your hosting setup,
-# you can specify the project name and repo with config variables and
-# avoid having to modify this script.  Try it with -n to see the
-# notification mail dumped to stdout and verify that it looks
-# sane. With -V it dumps its version and exits.
+# update hook. Try it with -n to see the notification mail dumped to
+# stdout and verify that it looks sane. With -V it dumps its version
+# and exits.
 #
 # In post-commit, run it without arguments. It will query for
 # current HEAD and the latest commit ID to get the information it
@@ -27,12 +25,17 @@
 # /path/to/ciabot.py ${refname} $(git rev-list ${oldhead}..${newhead} | tac)
 #
 # Configuration variables affecting this script:
-# ciabot.project = name of the project (required)
+#
+# ciabot.project = name of the project
 # ciabot.repo = name of the project repo for gitweb/cgit purposes
 # ciabot.xmlrpc  = if true (default), ship notifications via XML-RPC
 # ciabot.revformat = format in which the revision is shown
 #
-# The ciabot.repo value defaults to ciabot.project lowercased.
+# ciabot.project defaults to the directory name of the repository toplevel.
+# ciabot.repo defaults to ciabot.project lowercased.
+#
+# This means that in the normal case you need not do any configuration at all,
+# but setting the project name will speed it up slightly.
 #
 # The revformat variable may have the following values
 # raw -> full hex ID of commit
@@ -102,7 +105,7 @@ toaddr = "cia@cia.vc"
 # Identify the generator script.
 # Should only change when the script itself gets a new home and maintainer.
 generator = "http://www.catb.org/~esr/ciabot.py"
-version = "3.5"
+version = "3.6"
 
 def do(command):
     return commands.getstatusoutput(command)[1]
@@ -192,10 +195,17 @@ if __name__ == "__main__":
             print "ciabot.py: version", version
             sys.exit(0)
 
-    # Cough and die if user has not specified a project
+    # The project variable defaults to the name of the repository toplevel.
     if not project:
-        sys.stderr.write("ciabot.py: no project specified, bailing out.\n")
-        sys.exit(1)
+        here = os.getcwd()
+        while True:
+            if os.path.exists(os.path.join(here, ".git")):
+                project = os.path.basename(here)
+                break
+            elif here == '/':
+                sys.stderr.write("ciabot.py: no .git below root!\n")
+                sys.exit(1)
+            here = os.path.dirname(here)
 
     if not repo:
         repo = project.lower()
diff --git a/contrib/ciabot/ciabot.sh b/contrib/ciabot/ciabot.sh
index dde74004cb..3fbbc534ae 100755
--- a/contrib/ciabot/ciabot.sh
+++ b/contrib/ciabot/ciabot.sh
@@ -21,11 +21,9 @@
 # usage: ciabot.sh [-V] [-n] [-p projectname] [refname commit]
 #
 # This script is meant to be run either in a post-commit hook or in an
-# update hook.  If there's nothing unusual about your hosting setup,
-# you can specify the project name and repo with config variables and
-# avoid having to modify this script.  Try it with -n to see the
-# notification mail dumped to stdout and verify that it looks
-# sane. With -V it dumps its version and exits.
+# update hook. Try it with -n to see the notification mail dumped to
+# stdout and verify that it looks sane. With -V it dumps its version
+# and exits.
 #
 # In post-commit, run it without arguments. It will query for
 # current HEAD and the latest commit ID to get the information it
@@ -44,11 +42,16 @@
 # most recent to least - better to ship notifactions from oldest to newest.
 #
 # Configuration variables affecting this script:
-# ciabot.project = name of the project (makes -p option unnecessary)
+#
+# ciabot.project = name of the project
 # ciabot.repo = name of the project repo for gitweb/cgit purposes
 # ciabot.revformat = format in which the revision is shown
 #
-# The ciabot.repo defaults to ciabot.project lowercased.
+# ciabot.project defaults to the directory name of the repository toplevel.
+# ciabot.repo defaults to ciabot.project lowercased.
+#
+# This means that in the normal case you need not do any configuration at all,
+# but setting the project name will speed it up slightly.
 #
 # The revformat variable may have the following values
 # raw -> full hex ID of commit
@@ -64,10 +67,27 @@
 # shpped from an update in their actual order.)
 #
 
-# The project as known to CIA. You can also hardwire this or set it with a
-# -p option.
+# The project as known to CIA. You can set this with a -p option,
+# or let it default to the directory name of the repo toplevel.
 project=$(git config --get ciabot.project)
 
+if [ -z $project ]
+then
+    here=`pwd`;
+    while :; do
+	if [ -d $here/.git ]
+	then
+	    project=`basename $here`
+	    break
+	elif [ $here = '/' ]
+	then
+	    echo "ciabot.sh: no .git below root!"
+	    exit 1
+	fi
+	here=`dirname $here`
+    done
+fi
+
 # Name of the repo for gitweb/cgit purposes
 repo=$(git config --get ciabot.repo)
 [ -z $repo] && repo=$(echo "${project}" | tr '[A-Z]' '[a-z]')
@@ -100,7 +120,7 @@ urlprefix="http://${host}/cgi-bin/cgit.cgi/${repo}/commit/?id="
 # Identify the script. The 'generator' variable should change only
 # when the script itself gets a new home and maintainer.
 generator="http://www.catb.org/~esr/ciabot/ciabot.sh"
-version=3.4
+version=3.5
 
 # Addresses for the e-mail
 from="CIABOT-NOREPLY@${hostname}"
diff --git a/t/perf/perf-lib.sh b/t/perf/perf-lib.sh
index 5580c22812..a1361e530c 100644
--- a/t/perf/perf-lib.sh
+++ b/t/perf/perf-lib.sh
@@ -163,7 +163,7 @@ test_perf () {
 		else
 			echo "perf $test_count - $1:"
 		fi
-		for i in $(seq 1 $GIT_PERF_REPEAT_COUNT); do
+		for i in $(test_seq 1 $GIT_PERF_REPEAT_COUNT); do
 			say >&3 "running: $2"
 			if test_run_perf_ "$2"
 			then
diff --git a/t/t5551-http-fetch.sh b/t/t5551-http-fetch.sh
index fadf2f258e..91eaf53d1d 100755
--- a/t/t5551-http-fetch.sh
+++ b/t/t5551-http-fetch.sh
@@ -114,7 +114,7 @@ test -n "$GIT_TEST_LONG" && test_set_prereq EXPENSIVE
 test_expect_success EXPENSIVE 'create 50,000 tags in the repo' '
 	(
 	cd "$HTTPD_DOCUMENT_ROOT_PATH/repo.git" &&
-	for i in `seq 50000`
+	for i in `test_seq 50000`
 	do
 		echo "commit refs/heads/too-many-refs"
 		echo "mark :$i"
diff --git a/t/test-lib-functions.sh b/t/test-lib-functions.sh
index 80daaca780..9096398b18 100644
--- a/t/test-lib-functions.sh
+++ b/t/test-lib-functions.sh
@@ -530,6 +530,27 @@ test_cmp() {
 	$GIT_TEST_CMP "$@"
 }
 
+# Print a sequence of numbers or letters in increasing order.  This is
+# similar to GNU seq(1), but the latter might not be available
+# everywhere (and does not do letters).  It may be used like:
+#
+#	for i in `test_seq 100`; do
+#		for j in `test_seq 10 20`; do
+#			for k in `test_seq a z`; do
+#				echo $i-$j-$k
+#			done
+#		done
+#	done
+
+test_seq () {
+	case $# in
+	1)	set 1 "$@" ;;
+	2)	;;
+	*)	error "bug in the test script: not 1 or 2 parameters to test_seq" ;;
+	esac
+	"$PERL_PATH" -le 'print for $ARGV[0]..$ARGV[1]' -- "$@"
+}
+
 # This function can be used to schedule some commands to be run
 # unconditionally at the end of the test to restore sanity:
 #