linux-kernel - [PATCH] scripts/setlocalversion on write-protected source tree

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Date:	Fri, 14 Jun 2013 18:04:34 -0700 (PDT)
From:	Christian Kujau <lists@...dbynature.de>
To:	LKML <linux-kernel@...r.kernel.org>, akpm@...ux-foundation.org
cc:	nico-linuxsetlocalversion@...ottelius.org
Subject: [PATCH] scripts/setlocalversion on write-protected source tree

Since no one objected[0] and Nico kinda approved of my suggestion to 
remove "git update-index", I propose the 2nd version of this patch
for 3.11 (Linux, that is)

[0] https://lkml.org/lkml/2013/6/9/185

---

  Signed-off-by: Christian Kujau <lists@...dbynature.de>
  Cc: Nico Schottelius <nico-linuxsetlocalversion@...ottelius.org>

I just stumbled across another[0] issue when scripts/setlocalversion 
operates on a write-protected source tree. Back then[0] the source tree 
was on an read-only NFS share, so "test -w" was introduced before "git 
update-index" was run.

This time, the source tree is on read/write NFS share, but the permissions 
are world-readable and only a specific user (or root) can write. 
Thus, "test -w ." returns "0" and then runs "git update-index", 
producing the following message (on a dirty tree):

  fatal: Unable to create '/usr/local/src/linux-git/.git/index.lock': Permission denied

While it says "fatal", compilation continues just fine.

However, I don't think a kernel compilation should alter the source 
tree (or the .git directory) in any way and I don't see how removing 
"git update-index" could do any harm. The Mercurial and SVN routines in 
scripts/setlocalversion don't have any tree-modifying commands, AFAICS. 
So, maybe the patch below would be acceptable.

[0] https://patchwork.kernel.org/patch/29718/

---

diff --git a/scripts/setlocalversion b/scripts/setlocalversion
index 84b88f1..d105a44 100755
--- a/scripts/setlocalversion
+++ b/scripts/setlocalversion
@@ -71,9 +71,6 @@ scm_version()
 			printf -- '-svn%s' "`git svn find-rev $head`"
 		fi

-		# Update index only on r/w media
-		[ -w . ] && git update-index --refresh --unmerged > /dev/null
-
 		# Check for uncommitted changes
 		if git diff-index --name-only HEAD | grep -qv "^scripts/package"; then
 			printf '%s' -dirty

-- 
BOFH excuse #359:

YOU HAVE AN I/O ERROR -> Incompetent Operator error
--
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