From: Junio C Hamano <junkio@cox.net>
Date: Fri, 23 Dec 2005 06:37:50 +0000 (-0800)
Subject: checkout: sometimes work from a subdirectory.
X-Git-Tag: v1.1.0~24^2~1
X-Git-Url: https://git.octo.it/?p=git.git;a=commitdiff_plain;h=104f3e03c03a83617bac9d120b5e536c5f29d9ef

checkout: sometimes work from a subdirectory.

git-checkout does two very different things, and what they
should do when run from subdirectory are quite different.

It does not make any sense to run the one that switches the
current head from anywhere other than the toplevel:

	git-checkout [-f] <branch>
        git-checkout [-b <branch>] <committish>

We could of course chdir to top and do the whole-tree checkout
in git-checkout, but the point is the operation does not make
sense on a partial tree.  The whole tree is checked out.

The other form is to update the index file and working tree file
selectively:

	git-checkout <treeish> <file>... ;# out of tree to index and file
        git-checkout -- <file>...	 ;# out of index to file

This form _does_ make sense to run from subdirectory; and I
myself often wish we supported this.

So here is a patch to do both.

Signed-off-by: Junio C Hamano <junkio@cox.net>
---

diff --git a/git-checkout.sh b/git-checkout.sh
index 36308d22..1219ea0b 100755
--- a/git-checkout.sh
+++ b/git-checkout.sh
@@ -1,6 +1,7 @@
 #!/bin/sh
 
 USAGE='[-f] [-b <new_branch>] [<branch>] [<paths>...]'
+SUBDIRECTORY_OK=Sometimes
 . git-sh-setup
 
 old=$(git-rev-parse HEAD)
@@ -95,6 +96,14 @@ else
 	fi
 fi
 
+# We are switching branches and checking out trees, so
+# we *NEED* to be at the toplevel.
+cdup=$(git-rev-parse --show-cdup)
+if test ! -z "$cdup"
+then
+	cd "$cdup"
+fi
+
 [ -z "$new" ] && new=$old
 
 # If we don't have an old branch that we're switching to,