[RFC/PATCH 1/5] Makefile: move long inline shell loops in "install" into helper

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

Move a 37 line for-loop mess out of "install" and into a helper
script. This started out fairly innocent but over the years has grown
into a hard-to-maintain monster, and my recent ad874608d8 ("Makefile:
optionally symlink libexec/git-core binaries to bin/git", 2018-03-13)
certainly didn't help.

The shell code is ported pretty much as-is (with getopts added), it'll
be fixed & prettified in subsequent commits.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
---
 Makefile         | 52 ++++++++--------------------
 install_programs | 89 ++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 103 insertions(+), 38 deletions(-)
 create mode 100755 install_programs

diff --git a/Makefile b/Makefile
index bbfbb4292d..aa6ca1fa68 100644
--- a/Makefile
+++ b/Makefile
@@ -2808,44 +2808,20 @@ endif
 	bindir=$$(cd '$(DESTDIR_SQ)$(bindir_SQ)' && pwd) && \
 	execdir=$$(cd '$(DESTDIR_SQ)$(gitexec_instdir_SQ)' && pwd) && \
 	destdir_from_execdir_SQ=$$(echo '$(gitexecdir_relative_SQ)' | sed -e 's|[^/][^/]*|..|g') && \
-	{ test "$$bindir/" = "$$execdir/" || \
-	  for p in git$X $(filter $(install_bindir_programs),$(ALL_PROGRAMS)); do \
-		$(RM) "$$execdir/$$p" && \
-		test -n "$(INSTALL_SYMLINKS)" && \
-		ln -s "$$destdir_from_execdir_SQ/$(bindir_relative_SQ)/$$p" "$$execdir/$$p" || \
-		{ test -z "$(NO_INSTALL_HARDLINKS)$(NO_CROSS_DIRECTORY_HARDLINKS)" && \
-		  ln "$$bindir/$$p" "$$execdir/$$p" 2>/dev/null || \
-		  cp "$$bindir/$$p" "$$execdir/$$p" || exit; } \
-	  done; \
-	} && \
-	for p in $(filter $(install_bindir_programs),$(BUILT_INS)); do \
-		$(RM) "$$bindir/$$p" && \
-		test -n "$(INSTALL_SYMLINKS)" && \
-		ln -s "git$X" "$$bindir/$$p" || \
-		{ test -z "$(NO_INSTALL_HARDLINKS)" && \
-		  ln "$$bindir/git$X" "$$bindir/$$p" 2>/dev/null || \
-		  ln -s "git$X" "$$bindir/$$p" 2>/dev/null || \
-		  cp "$$bindir/git$X" "$$bindir/$$p" || exit; } \
-	done && \
-	for p in $(BUILT_INS); do \
-		$(RM) "$$execdir/$$p" && \
-		test -n "$(INSTALL_SYMLINKS)" && \
-		ln -s "$$destdir_from_execdir_SQ/$(bindir_relative_SQ)/git$X" "$$execdir/$$p" || \
-		{ test -z "$(NO_INSTALL_HARDLINKS)" && \
-		  ln "$$execdir/git$X" "$$execdir/$$p" 2>/dev/null || \
-		  ln -s "git$X" "$$execdir/$$p" 2>/dev/null || \
-		  cp "$$execdir/git$X" "$$execdir/$$p" || exit; } \
-	done && \
-	remote_curl_aliases="$(REMOTE_CURL_ALIASES)" && \
-	for p in $$remote_curl_aliases; do \
-		$(RM) "$$execdir/$$p" && \
-		test -n "$(INSTALL_SYMLINKS)" && \
-		ln -s "git-remote-http$X" "$$execdir/$$p" || \
-		{ test -z "$(NO_INSTALL_HARDLINKS)" && \
-		  ln "$$execdir/git-remote-http$X" "$$execdir/$$p" 2>/dev/null || \
-		  ln -s "git-remote-http$X" "$$execdir/$$p" 2>/dev/null || \
-		  cp "$$execdir/git-remote-http$X" "$$execdir/$$p" || exit; } \
-	done && \
+	./install_programs \
+		--X="$$X" \
+		--RM="$(RM)" \
+		--bindir="$$bindir" \
+		--bindir-relative="$(bindir_relative_SQ)" \
+		--execdir="$$execdir" \
+		--destdir-from-execdir="$$destdir_from_execdir_SQ" \
+		--flag-install-symlinks="$(INSTALL_SYMLINKS)" \
+		--flag-no-install-hardlinks="$(NO_INSTALL_HARDLINKS)" \
+		--flag-no-cross-directory-hardlinks="$(NO_CROSS_DIRECTORY_HARDLINKS)" \
+		--list-bindir-standalone="git$X $(filter $(install_bindir_programs),$(ALL_PROGRAMS))" \
+		--list-bindir-git-dashed="$(filter $(install_bindir_programs),$(BUILT_INS))" \
+		--list-execdir-git-dashed="$(BUILT_INS)" \
+		--list-execdir-curl-aliases="$(REMOTE_CURL_ALIASES)" && \
 	./check_bindir "z$$bindir" "z$$execdir" "$$bindir/git-add$X"
 
 .PHONY: install-gitweb install-doc install-man install-man-perl install-html install-info install-pdf
diff --git a/install_programs b/install_programs
new file mode 100755
index 0000000000..e287108112
--- /dev/null
+++ b/install_programs
@@ -0,0 +1,89 @@
+#!/bin/sh
+
+while test $# != 0
+do
+	case "$1" in
+	--X=*)
+		X="${1#--X=}"
+		;;
+	--RM=*)
+		RM="${1#--RM=}"
+		;;
+	--bindir=*)
+		bindir="${1#--bindir=}"
+		;;
+	--bindir-relative=*)
+		bindir_relative="${1#--bindir-relative=}"
+		;;
+	--execdir=*)
+		execdir="${1#--execdir=}"
+		;;
+	--destdir-from-execdir=*)
+		destdir_from_execdir="${1#--destdir-from-execdir=}"
+		;;
+	--flag-install-symlinks=*)
+		INSTALL_SYMLINKS="${1#--flag-install-symlinks=}"
+		;;
+	--flag-no-install-hardlinks=*)
+		NO_INSTALL_HARDLINKS="${1#--flag-no-install-hardlinks=}"
+		;;
+	--flag-no-cross-directory-hardlinks=*)
+		NO_CROSS_DIRECTORY_HARDLINKS="${1#--flag-no-cross-directory-hardlinks=}"
+		;;
+	--list-bindir-standalone=*)
+		list_bindir_standalone="${1#--list-bindir-standalone=}"
+		;;
+	--list-bindir-git-dashed=*)
+		list_bindir_git_dashed="${1#--list-bindir-git-dashed=}"
+		;;
+	--list-execdir-git-dashed=*)
+		list_execdir_git_dashed="${1#--list-execdir-git-dashed=}"
+		;;
+	--list-execdir-curl-aliases=*)
+		list_execdir_curl_aliases="${1#--list-execdir-curl-aliases=}"
+		;;
+
+	*)
+		echo "Unknown option $1"
+		exit 1
+		;;
+	esac
+	shift
+done &&
+{ test "$bindir/" = "$execdir/" ||
+  for p in $list_bindir_standalone; do
+	$RM "$execdir/$p" &&
+	test -n "$INSTALL_SYMLINKS" &&
+	ln -s "$destdir_from_execdir/$bindir_relative/$p" "$execdir/$p" ||
+	{ test -z "$NO_INSTALL_HARDLINKS$NO_CROSS_DIRECTORY_HARDLINKS" &&
+	  ln "$bindir/$p" "$execdir/$p" 2>/dev/null ||
+	  cp "$bindir/$p" "$execdir/$p" || exit; }
+  done;
+} &&
+for p in $list_bindir_git_dashed; do
+	$RM "$bindir/$p" &&
+	test -n "$INSTALL_SYMLINKS" &&
+	ln -s "git$X" "$bindir/$p" ||
+	{ test -z "$NO_INSTALL_HARDLINKS" &&
+	  ln "$bindir/git$X" "$bindir/$p" 2>/dev/null ||
+	  ln -s "git$X" "$bindir/$p" 2>/dev/null ||
+	  cp "$bindir/git$X" "$bindir/$p" || exit; }
+done &&
+for p in $list_execdir_git_dashed; do
+	$RM "$execdir/$p" &&
+	test -n "$INSTALL_SYMLINKS" &&
+	ln -s "$destdir_from_execdir/$bindir_relative/git$X" "$execdir/$p" ||
+	{ test -z "$NO_INSTALL_HARDLINKS" &&
+	  ln "$execdir/git$X" "$execdir/$p" 2>/dev/null ||
+	  ln -s "git$X" "$execdir/$p" 2>/dev/null ||
+	  cp "$execdir/git$X" "$execdir/$p" || exit; }
+done &&
+for p in $list_execdir_curl_aliases; do
+	$RM "$execdir/$p" &&
+	test -n "$INSTALL_SYMLINKS" &&
+	ln -s "git-remote-http$X" "$execdir/$p" ||
+	{ test -z "$NO_INSTALL_HARDLINKS" &&
+	  ln "$execdir/git-remote-http$X" "$execdir/$p" 2>/dev/null ||
+	  ln -s "git-remote-http$X" "$execdir/$p" 2>/dev/null ||
+	  cp "$execdir/git-remote-http$X" "$execdir/$p" || exit; }
+done
-- 
2.19.1.930.g4563a0d9d0