It occurs to me that having generic ability to tell notmuch to retry
until the DB isn't locked might useful.  So I put the functionality in a
script that can sit between notmuch and various clients.  It will
simplify my emacs setup, and improve it since emacs's handling of
asynchronous processes isn't great.

This script calls notmuch and passes on all commandline arguments.  If
DB is locked, keep trying notmuch until the DB isn't locked.  Notmuch's
stdout and stderr go to stdout and stderr.  Returns notmuch's return
code.

Maybe this retry loop should be put in notmuch itself?

---
 notmuch-retry |   51 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 51 insertions(+), 0 deletions(-)
 create mode 100755 notmuch-retry

diff --git a/notmuch-retry b/notmuch-retry
new file mode 100755
index 0000000..2d7fcbc
--- /dev/null
+++ b/notmuch-retry
@@ -0,0 +1,51 @@
+#!/bin/bash
+#
+# notmuch-retry --- call notmuch and retry if DB is locked
+#
+# Calls notmuch and passes on all commandline arguments.  If DB is
+# locked, keep trying notmuch until the DB isn't locked.  Notmuch's
+# stdout and stderr go to stdout and stderr.  Returns notmuch's return
+# code.
+#
+# Copyright 2010 James Vasile
+#
+# This 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.
+#
+# This software 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 this software.  If not, see
+# <http://www.gnu.org/licenses/>.
+#
+# Authors: James Vasile <james at hackervisions.org>
+
+bin=`which notmuch`
+
+notmuch_retry () {    
+    regex="already locked"
+    while [ 1 -gt 0 ]; do
+       $bin $@ 2>$err
+       retcode=$?
+       result=$(<$err)
+       if [[ $result =~ $regex ]]; then
+           sleep 2.5
+       else
+           if [ -n "$result" ]; then
+               echo $result >&2
+           fi
+           return $retcode
+       fi
+    done
+}
+
+err=$(mktemp)
+notmuch_retry $@
+retcode=$?
+rm $err
+exit $retcode
-- 
1.6.3.3

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