linux-kernel - [PATCH 3/5] scripts/setlocalversion: add more comments to -dirty flag detection

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Message-Id: <20210523031428.164186-3-masahiroy@kernel.org>
Date:   Sun, 23 May 2021 12:14:26 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     linux-kbuild@...r.kernel.org
Cc:     Nico Schottelius <nico-linuxsetlocalversion@...ottelius.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Matthias Maennich <maennich@...gle.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 3/5] scripts/setlocalversion: add more comments to -dirty flag detection

This script stumbled on the read-only source tree over again:

 - a2bb90a08cb3 ("kbuild: fix delay in setlocalversion on readonly
   source")

 - cdf2bc632ebc ("scripts/setlocalversion on write-protected source
   tree")

 - 8ef14c2c41d9 ("Revert "scripts/setlocalversion: git: Make -dirty
   check more robust"")

 - ff64dd485730 ("scripts/setlocalversion: Improve -dirty check with
   git-status --no-optional-locks")

Add comments to clarify that this script should never ever try to write
to the source tree.

'git describe --dirty' might look as a simple solution for appending
the -dirty string, but we cannot use it because it creates the
.git/index.lock file.

Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
---

 scripts/setlocalversion | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/scripts/setlocalversion b/scripts/setlocalversion
index f3084d6bbb22..6865df6699c8 100755
--- a/scripts/setlocalversion
+++ b/scripts/setlocalversion
@@ -80,6 +80,10 @@ scm_version()
 		fi
 
 		# Check for uncommitted changes.
+		# This script must avoid any write attempt to the source tree,
+		# which might be read-only.
+		# You cannot use 'git describe --dirty' because it tries to
+		# create .git/index.lock .
 		# First, with git-status, but --no-optional-locks is only
 		# supported in git >= 2.14, so fall back to git-diff-index if
 		# it fails. Note that git-diff-index does not refresh the
-- 
2.27.0