[PATCH 1/4] git-subtree: move from contrib/subtree/

["Ævar Arnfjörð Bjarmason" <avarab@gmail.com>]

Change the git-subtree command from living in contrib to being a
"real" git command.

I think it's useful enough that it should be shipped by default, and
unlike git-submodule doesn't need any changes to git's object
format. It's just a helper to do things you can do manually already
with plumbing tools (but that would be much more tedious).

It'll also help to avoid the confusion noted in
https://public-inbox.org/git/alpine.LFD.2.21.1802070547040.5530@android-a172fe96dd584b41/
where users know git-subtree exists, but can't find its
documentation (or it isn't installed).

This change removes config/subtree's copy of COPYING because it's
redundant to the one in the root of the tree. The contrib/subtree/todo
file is being removed because we don't usually store TODOs
in-tree (and this'll be available in the history), the rest like the
.gitignore, Makefile etc. are all redundant to things we have in-tree.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
---
 .gitignore                                    |   1 +
 Documentation/git-submodule.txt               |   2 +-
 .../subtree => Documentation}/git-subtree.txt |   3 +
 Makefile                                      |   1 +
 contrib/subtree/.gitignore                    |   7 -
 contrib/subtree/COPYING                       | 339 ------------------
 contrib/subtree/INSTALL                       |  28 --
 contrib/subtree/Makefile                      |  97 -----
 contrib/subtree/README                        |   8 -
 contrib/subtree/t/Makefile                    |  86 -----
 contrib/subtree/todo                          |  48 ---
 .../subtree/git-subtree.sh => git-subtree.sh  |   0
 {contrib/subtree/t => t}/t7900-subtree.sh     |   5 +-
 13 files changed, 7 insertions(+), 618 deletions(-)
 rename {contrib/subtree => Documentation}/git-subtree.txt (99%)
 delete mode 100644 contrib/subtree/.gitignore
 delete mode 100644 contrib/subtree/COPYING
 delete mode 100644 contrib/subtree/INSTALL
 delete mode 100644 contrib/subtree/Makefile
 delete mode 100644 contrib/subtree/README
 delete mode 100644 contrib/subtree/t/Makefile
 delete mode 100644 contrib/subtree/todo
 rename contrib/subtree/git-subtree.sh => git-subtree.sh (100%)
 rename {contrib/subtree/t => t}/t7900-subtree.sh (99%)

diff --git a/.gitignore b/.gitignore
index 833ef3b0b7..b78a5b6e0a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -155,6 +155,7 @@
 /git-status
 /git-stripspace
 /git-submodule
+/git-subtree
 /git-submodule--helper
 /git-svn
 /git-symbolic-ref
diff --git a/Documentation/git-submodule.txt b/Documentation/git-submodule.txt
index 71c5618e82..ba718d2c9b 100644
--- a/Documentation/git-submodule.txt
+++ b/Documentation/git-submodule.txt
@@ -402,7 +402,7 @@ for details.
 
 SEE ALSO
 --------
-linkgit:gitsubmodules[7], linkgit:gitmodules[5].
+linkgit:gitsubmodules[7], linkgit:gitmodules[5], linkgit:git-subtree[1].
 
 GIT
 ---
diff --git a/contrib/subtree/git-subtree.txt b/Documentation/git-subtree.txt
similarity index 99%
rename from contrib/subtree/git-subtree.txt
rename to Documentation/git-subtree.txt
index 352deda69d..f206a32c8f 100644
--- a/contrib/subtree/git-subtree.txt
+++ b/Documentation/git-subtree.txt
@@ -345,6 +345,9 @@ AUTHOR
 ------
 Written by Avery Pennarun <apenwarr@gmail.com>
 
+SEE ALSO
+--------
+linkgit:git-submodule[1].
 
 GIT
 ---
diff --git a/Makefile b/Makefile
index 50da82b016..82cdac3aa2 100644
--- a/Makefile
+++ b/Makefile
@@ -576,6 +576,7 @@ SCRIPT_SH += git-remote-testgit.sh
 SCRIPT_SH += git-request-pull.sh
 SCRIPT_SH += git-stash.sh
 SCRIPT_SH += git-submodule.sh
+SCRIPT_SH += git-subtree.sh
 SCRIPT_SH += git-web--browse.sh
 
 SCRIPT_LIB += git-mergetool--lib
diff --git a/contrib/subtree/.gitignore b/contrib/subtree/.gitignore
deleted file mode 100644
index 0b9381abca..0000000000
--- a/contrib/subtree/.gitignore
+++ /dev/null
@@ -1,7 +0,0 @@
-*~
-git-subtree
-git-subtree.1
-git-subtree.html
-git-subtree.xml
-mainline
-subproj
diff --git a/contrib/subtree/COPYING b/contrib/subtree/COPYING
deleted file mode 100644
index d511905c16..0000000000
--- a/contrib/subtree/COPYING
+++ /dev/null
@@ -1,339 +0,0 @@
-		    GNU GENERAL PUBLIC LICENSE
-		       Version 2, June 1991
-
- Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
- 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- Everyone is permitted to copy and distribute verbatim copies
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diff --git a/contrib/subtree/INSTALL b/contrib/subtree/INSTALL
deleted file mode 100644
index 7ab0cf4509..0000000000
--- a/contrib/subtree/INSTALL
+++ /dev/null
@@ -1,28 +0,0 @@
-HOW TO INSTALL git-subtree
-==========================
-
-First, build from the top source directory.
-
-Then, in contrib/subtree, run:
-
-  make
-  make install
-  make install-doc
-
-If you used configure to do the main build the git-subtree build will
-pick up those settings.  If not, you will likely have to provide a
-value for prefix:
-
-  make prefix=<some dir>
-  make prefix=<some dir> install
-  make prefix=<some dir> install-doc
-
-To run tests first copy git-subtree to the main build area so the
-newly-built git can find it:
-
-  cp git-subtree ../..
-
-Then:
-
-  make test
-
diff --git a/contrib/subtree/Makefile b/contrib/subtree/Makefile
deleted file mode 100644
index 5c6cc4ab2c..0000000000
--- a/contrib/subtree/Makefile
+++ /dev/null
@@ -1,97 +0,0 @@
-# The default target of this Makefile is...
-all::
-
--include ../../config.mak.autogen
--include ../../config.mak
-
-prefix ?= /usr/local
-gitexecdir ?= $(prefix)/libexec/git-core
-mandir ?= $(prefix)/share/man
-man1dir ?= $(mandir)/man1
-htmldir ?= $(prefix)/share/doc/git-doc
-
-../../GIT-VERSION-FILE: FORCE
-	$(MAKE) -C ../../ GIT-VERSION-FILE
-
--include ../../GIT-VERSION-FILE
-
-# this should be set to a 'standard' bsd-type install program
-INSTALL  ?= install
-RM       ?= rm -f
-
-ASCIIDOC         = asciidoc
-ASCIIDOC_CONF    = -f ../../Documentation/asciidoc.conf
-ASCIIDOC_HTML    = xhtml11
-ASCIIDOC_DOCBOOK = docbook
-ASCIIDOC_EXTRA   =
-XMLTO            = xmlto
-
-ifdef USE_ASCIIDOCTOR
-ASCIIDOC         = asciidoctor
-ASCIIDOC_CONF    =
-ASCIIDOC_HTML    = xhtml5
-ASCIIDOC_DOCBOOK = docbook45
-ASCIIDOC_EXTRA  += -I../../Documentation -rasciidoctor-extensions
-ASCIIDOC_EXTRA  += -alitdd='&\#x2d;&\#x2d;'
-endif
-
-ifndef SHELL_PATH
-	SHELL_PATH = /bin/sh
-endif
-SHELL_PATH_SQ = $(subst ','\'',$(SHELL_PATH))
-
-MANPAGE_XSL   = ../../Documentation/manpage-normal.xsl
-
-GIT_SUBTREE_SH := git-subtree.sh
-GIT_SUBTREE    := git-subtree
-
-GIT_SUBTREE_DOC := git-subtree.1
-GIT_SUBTREE_XML := git-subtree.xml
-GIT_SUBTREE_TXT := git-subtree.txt
-GIT_SUBTREE_HTML := git-subtree.html
-GIT_SUBTREE_TEST := ../../git-subtree
-
-all:: $(GIT_SUBTREE)
-
-$(GIT_SUBTREE): $(GIT_SUBTREE_SH)
-	sed -e '1s|#!.*/sh|#!$(SHELL_PATH_SQ)|' $< >$@
-	chmod +x $@
-
-doc: $(GIT_SUBTREE_DOC) $(GIT_SUBTREE_HTML)
-
-install: $(GIT_SUBTREE)
-	$(INSTALL) -d -m 755 $(DESTDIR)$(gitexecdir)
-	$(INSTALL) -m 755 $(GIT_SUBTREE) $(DESTDIR)$(gitexecdir)
-
-install-doc: install-man install-html
-
-install-man: $(GIT_SUBTREE_DOC)
-	$(INSTALL) -d -m 755 $(DESTDIR)$(man1dir)
-	$(INSTALL) -m 644 $^ $(DESTDIR)$(man1dir)
-
-install-html: $(GIT_SUBTREE_HTML)
-	$(INSTALL) -d -m 755 $(DESTDIR)$(htmldir)
-	$(INSTALL) -m 644 $^ $(DESTDIR)$(htmldir)
-
-$(GIT_SUBTREE_DOC): $(GIT_SUBTREE_XML)
-	$(XMLTO) -m $(MANPAGE_XSL) man $^
-
-$(GIT_SUBTREE_XML): $(GIT_SUBTREE_TXT)
-	$(ASCIIDOC) -b $(ASCIIDOC_DOCBOOK) -d manpage $(ASCIIDOC_CONF) \
-		-agit_version=$(GIT_VERSION) $(ASCIIDOC_EXTRA) $^
-
-$(GIT_SUBTREE_HTML): $(GIT_SUBTREE_TXT)
-	$(ASCIIDOC) -b $(ASCIIDOC_HTML) -d manpage $(ASCIIDOC_CONF) \
-		-agit_version=$(GIT_VERSION) $(ASCIIDOC_EXTRA) $^
-
-$(GIT_SUBTREE_TEST): $(GIT_SUBTREE)
-	cp $< $@
-
-test: $(GIT_SUBTREE_TEST)
-	$(MAKE) -C t/ test
-
-clean:
-	$(RM) $(GIT_SUBTREE)
-	$(RM) *.xml *.html *.1
-
-.PHONY: FORCE
diff --git a/contrib/subtree/README b/contrib/subtree/README
deleted file mode 100644
index c686b4a69b..0000000000
--- a/contrib/subtree/README
+++ /dev/null
@@ -1,8 +0,0 @@
-
-Please read git-subtree.txt for documentation.
-
-Please don't contact me using github mail; it's slow, ugly, and worst of
-all, redundant. Email me instead at apenwarr@gmail.com and I'll be happy to
-help.
-
-Avery
diff --git a/contrib/subtree/t/Makefile b/contrib/subtree/t/Makefile
deleted file mode 100644
index 276898eb6b..0000000000
--- a/contrib/subtree/t/Makefile
+++ /dev/null
@@ -1,86 +0,0 @@
-# Run tests
-#
-# Copyright (c) 2005 Junio C Hamano
-#
-
--include ../../../config.mak.autogen
--include ../../../config.mak
-
-#GIT_TEST_OPTS=--verbose --debug
-SHELL_PATH ?= $(SHELL)
-PERL_PATH ?= /usr/bin/perl
-TAR ?= $(TAR)
-RM ?= rm -f
-PROVE ?= prove
-DEFAULT_TEST_TARGET ?= test
-TEST_LINT ?= test-lint
-
-ifdef TEST_OUTPUT_DIRECTORY
-TEST_RESULTS_DIRECTORY = $(TEST_OUTPUT_DIRECTORY)/test-results
-else
-TEST_RESULTS_DIRECTORY = ../../../t/test-results
-endif
-
-# Shell quote;
-SHELL_PATH_SQ = $(subst ','\'',$(SHELL_PATH))
-PERL_PATH_SQ = $(subst ','\'',$(PERL_PATH))
-TEST_RESULTS_DIRECTORY_SQ = $(subst ','\'',$(TEST_RESULTS_DIRECTORY))
-
-T = $(sort $(wildcard t[0-9][0-9][0-9][0-9]-*.sh))
-TSVN = $(sort $(wildcard t91[0-9][0-9]-*.sh))
-TGITWEB = $(sort $(wildcard t95[0-9][0-9]-*.sh))
-THELPERS = $(sort $(filter-out $(T),$(wildcard *.sh)))
-
-all: $(DEFAULT_TEST_TARGET)
-
-test: pre-clean $(TEST_LINT)
-	$(MAKE) aggregate-results-and-cleanup
-
-prove: pre-clean $(TEST_LINT)
-	@echo "*** prove ***"; GIT_CONFIG=.git/config $(PROVE) --exec '$(SHELL_PATH_SQ)' $(GIT_PROVE_OPTS) $(T) :: $(GIT_TEST_OPTS)
-	$(MAKE) clean-except-prove-cache
-
-$(T):
-	@echo "*** $@ ***"; GIT_CONFIG=.git/config '$(SHELL_PATH_SQ)' $@ $(GIT_TEST_OPTS)
-
-pre-clean:
-	$(RM) -r '$(TEST_RESULTS_DIRECTORY_SQ)'
-
-clean-except-prove-cache:
-	$(RM) -r 'trash directory'.* '$(TEST_RESULTS_DIRECTORY_SQ)'
-	$(RM) -r valgrind/bin
-
-clean: clean-except-prove-cache
-	$(RM) .prove
-
-test-lint: test-lint-duplicates test-lint-executable test-lint-shell-syntax
-
-test-lint-duplicates:
-	@dups=`echo $(T) | tr ' ' '\n' | sed 's/-.*//' | sort | uniq -d` && \
-		test -z "$$dups" || { \
-		echo >&2 "duplicate test numbers:" $$dups; exit 1; }
-
-test-lint-executable:
-	@bad=`for i in $(T); do test -x "$$i" || echo $$i; done` && \
-		test -z "$$bad" || { \
-		echo >&2 "non-executable tests:" $$bad; exit 1; }
-
-test-lint-shell-syntax:
-	@'$(PERL_PATH_SQ)' ../../../t/check-non-portable-shell.pl $(T) $(THELPERS)
-
-aggregate-results-and-cleanup: $(T)
-	$(MAKE) aggregate-results
-	$(MAKE) clean
-
-aggregate-results:
-	for f in '$(TEST_RESULTS_DIRECTORY_SQ)'/t*-*.counts; do \
-		echo "$$f"; \
-	done | '$(SHELL_PATH_SQ)' ../../../t/aggregate-results.sh
-
-valgrind:
-	$(MAKE) GIT_TEST_OPTS="$(GIT_TEST_OPTS) --valgrind"
-
-test-results:
-	mkdir -p test-results
-
-.PHONY: pre-clean $(T) aggregate-results clean valgrind
diff --git a/contrib/subtree/todo b/contrib/subtree/todo
deleted file mode 100644
index 0d0e777651..0000000000
--- a/contrib/subtree/todo
+++ /dev/null
@@ -1,48 +0,0 @@
-
-	delete tempdir
-
-	'git subtree rejoin' option to do the same as --rejoin, eg. after a
-	  rebase
-
-	--prefix doesn't force the subtree correctly in merge/pull:
-	"-s subtree" should be given an explicit subtree option?
-		There doesn't seem to be a way to do this.  We'd have to
-		patch git-merge-subtree.  Ugh.
-		(but we could avoid this problem by generating squashes with
-		exactly the right subtree structure, rather than using
-		subtree merge...)
-
-	add a 'log' subcommand to see what's new in a subtree?
-
-	add to-submodule and from-submodule commands
-
-	automated tests for --squash stuff
-
-	"add" command non-obviously requires a commitid; would be easier if
-		it had a "pull" sort of mode instead
-
-	"pull" and "merge" commands should fail if you've never merged
-		that --prefix before
-		
-	docs should provide an example of "add"
-	
-	note that the initial split doesn't *have* to have a commitid
-		specified... that's just an optimization
-
-	if you try to add (or maybe merge?) with an invalid commitid, you
-		get a misleading "prefix must end with /" message from
-		one of the other git tools that git-subtree calls.  Should
-		detect this situation and print the *real* problem.
-	
-	"pull --squash" should do fetch-synthesize-merge, but instead just
-		does "pull" directly, which doesn't work at all.
-
-	make a 'force-update' that does what 'add' does even if the subtree
-		already exists.  That way we can help people who imported
-		subtrees "incorrectly" (eg. by just copying in the files) in
-		the past.
-
-	guess --prefix automatically if possible based on pwd
-
-	make a 'git subtree grafts' that automatically expands --squash'd
-		commits so you can see the full history if you want it.
diff --git a/contrib/subtree/git-subtree.sh b/git-subtree.sh
similarity index 100%
rename from contrib/subtree/git-subtree.sh
rename to git-subtree.sh
diff --git a/contrib/subtree/t/t7900-subtree.sh b/t/t7900-subtree.sh
similarity index 99%
rename from contrib/subtree/t/t7900-subtree.sh
rename to t/t7900-subtree.sh
index d05c613c97..eb223ff049 100755
--- a/contrib/subtree/t/t7900-subtree.sh
+++ b/t/t7900-subtree.sh
@@ -9,10 +9,7 @@ This test verifies the basic operation of the add, pull, merge
 and split subcommands of git subtree.
 '
 
-TEST_DIRECTORY=$(pwd)/../../../t
-export TEST_DIRECTORY
-
-. ../../../t/test-lib.sh
+. ./test-lib.sh
 
 subtree_test_create_repo()
 {
-- 
2.17.0.290.gded63e768a