[PATCH 1/2] Makefile: create an install-symlinks target

From: David Kastrup <dak@gnu.org>
Date: Jul 18, 2007, 10:41 UTC
Message-ID: <6e14af24a3aa8af7e21e0a3f92c83c82e147202a.1184770193.git.dak@gnu.org>
In-Reply-To: <861wf5iz6o.fsf@lola.quinscape.zz>

This target allows you to have git installed in one location, and have symbolic links to all of the programs installed in another location. For example, if git was installed to /opt/git with

	make prefix=/opt/git install

you can install symbolic links in /usr/local/bin with

	make symlinkprefix=/usr/local prefix=/opt/git \
		install-symlinks

This makes it reasonably easy to remove such a package, by doing

	rm -rf /opt/git

and then removing stale links with

	find /usr/local -xtype l -print0|xargs -0 rm

(be sure to first see whether you indeed get only stale links listed).

This works by copying the directory hierarchy of $prefix to $symlinkprefix (not copying or descending to any directories of the name git* matched case-insensitively), then linking all the rest.

Signed-off-by: David Kastrup <dak@gnu.org>
---
 Makefile |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)

diff --git a/Makefile b/Makefile
index 73b487f..7e53378 100644
--- a/Makefile
+++ b/Makefile
@@ -142,6 +142,7 @@ ALL_LDFLAGS = $(LDFLAGS)
 STRIP ?= strip
 
 prefix = $(HOME)
+symlinkprefix = /usr/local
 bindir = $(prefix)/bin
 gitexecdir = $(bindir)
 sharedir = $(prefix)/share
@@ -996,7 +997,13 @@ install-doc:
 quick-install-doc:
 	$(MAKE) -C Documentation quick-install
 
-
+# The somewhat strange looking lines start with an ignored $(MAKE) in
+# order to be executed also in make -n calls.
+install-symlinks:
+	@: $(MAKE) && cd '$(prefix_SQ)' && find . -type d ! \( -iname 'git*' -prune \) -exec echo $(INSTALL) -m 755 -d '$(symlinkprefix)/{}' \;
+	@cd '$(prefix_SQ)' && find . -type d ! \( -iname 'git*' -prune \) -exec $(INSTALL) -m 755 -d '$(symlinkprefix)/{}' \;
+	@: $(MAKE) && cd '$(prefix_SQ)' && find . \( -type d -iname 'git*' -prune -o ! -type d \) -exec echo $(RM) -r '$(symlinkprefix)/{}' \; -exec echo ln -s '$(prefix_SQ)/{}' '$(symlinkprefix)/{}' \;
+	@cd '$(prefix_SQ)' && find . \( -type d -iname 'git*' -prune -o ! -type d \) -exec $(RM) -r '$(symlinkprefix)/{}' \; -exec ln -s '$(prefix_SQ)/{}' '$(symlinkprefix)/{}' \;
 
 ### Maintainer's dist rules

-- 
1.5.3.rc2.41.gb47b1