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bug#35368: [PATCH v3] Do potentially destructive operations in prepare-c


From: Konstantin Kharlamov
Subject: bug#35368: [PATCH v3] Do potentially destructive operations in prepare-commit-msg
Date: Wed, 15 May 2019 01:26:47 +0300

* build-aux/git-hooks/prepare-commit-msg: if someone occasionally puts
Signed-off line, it will likely get there through -s option of git.
Exploit this fact to abort before a user got a chance to type commit
message.
---

v3: remove unused at_sign, cent_sign, and COMMIT_MSG_FILE awk variables

 autogen.sh                             |  4 +--
 build-aux/git-hooks/prepare-commit-msg | 43 ++++++++++++++++++++++++++
 2 files changed, 45 insertions(+), 2 deletions(-)
 create mode 100755 build-aux/git-hooks/prepare-commit-msg

diff --git a/autogen.sh b/autogen.sh
index 40d0c37b11b..a0a2ac3c689 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+ #!/bin/sh
 ### autogen.sh - tool to help build Emacs from a repository checkout
 
 ## Copyright (C) 2011-2019 Free Software Foundation, Inc.
@@ -332,7 +332,7 @@ hooks=
 tailored_hooks=
 sample_hooks=
 
-for hook in commit-msg pre-commit; do
+for hook in commit-msg pre-commit prepare-commit-msg; do
     cmp -- build-aux/git-hooks/$hook "$hooks/$hook" >/dev/null 2>&1 ||
        tailored_hooks="$tailored_hooks $hook"
 done
diff --git a/build-aux/git-hooks/prepare-commit-msg 
b/build-aux/git-hooks/prepare-commit-msg
new file mode 100755
index 00000000000..961ddf38486
--- /dev/null
+++ b/build-aux/git-hooks/prepare-commit-msg
@@ -0,0 +1,43 @@
+#!/bin/sh
+# Check the format of GNU Emacs change log entries.
+
+# Copyright 2019 Free Software Foundation, Inc.
+
+# This file is part of GNU Emacs.
+
+# GNU Emacs is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# GNU Emacs is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
+
+COMMIT_MSG_FILE=$1
+COMMIT_SOURCE=$2
+SHA1=$3
+
+# Prefer gawk if available, as it handles NUL bytes properly.
+if type gawk >/dev/null 2>&1; then
+  awk=gawk
+else
+  awk=awk
+fi
+
+exec $awk '
+  /^Signed-off-by: / {
+    print "'\''Signed-off-by:'\'' in commit message"
+    status = 1
+  }
+  END {
+    if (status != 0) {
+      print "Commit aborted; please see the file 'CONTRIBUTE'"
+    }
+    exit status
+  }
+' <"$COMMIT_MSG_FILE"
-- 
2.21.0






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