emacstips.mdwn: M-x delete-trailing-whitespace

[obsolete/notmuch-wiki] / remoteusage.mdwn

diff --git a/remoteusage.mdwn b/remoteusage.mdwn
index 2e320ce6dec64b9000354e67eb0dd9ad9fb9930c..2e867e2e4f3e140715b4336a5026607cc24bb597 100644 (file)
--- a/remoteusage.mdwn
+++ b/remoteusage.mdwn
@@ -18,15 +18,20 @@ couple of common unix utilities (ssh and dtach).
 You will need to have the following items in place:
 
 1.  a working notmuch on one computer (let's call that computer
-"server"). 
+"server").
+
 2.  a working notmuch emacs interface on another computer (let's call
 that computer "client")
-3.   `ssh` and `dtach` on your client computer. (TODO: Make dtach
-optional, or allow screen or tmux to be used instead.)
-4.   password-free login (public key authentication) from client to
+
+3.  `ssh` and `dtach` on your client computer. (TODO: Make dtach
+optional, or allow screen or tmux to be used instead.
+[[Here|remotewrapper]] is a version that does not require dtach.)
+
+4.  password-free login (public key authentication) from client to
 server. [Here](http://www.debian-administration.org/articles/152) is a
 good page on how to set it up.
-5.   a reasonably fast connection. (This isn't really *neccessary*, but
+
+5.  a reasonably fast connection. (This isn't really *neccessary*, but
 if your connection is too slow, this won't be very pleasant to use,
 and certainly won't seem transparent.)
 
@@ -37,47 +42,69 @@ Now we will need to write a simple shell script that does two things:
 
 1.  replaces the call to the notmuch binary with a call to notmuch
 over ssh.
+
 2.  sets up a running, detached, ssh connection to the server, so that
 future calls can reuse the socket.
 
-    #!/usr/bin/env bash
-    
-    SSH_BIN="ssh"
-    USER="example_user"
-    SSH_HOST="example.com"
-    SSH_SOCKET="/tmp/notmuch_ssh.socket"
-    NOTMUCH_REMOTE_BIN="notmuch"
-    DTACH="dtach"
-    DTACH_SOCKET="/tmp/notmuch_dtach.socket"
-    
-    check_for_socket ()
-    {
-        [ -S "${SSH_SOCKET}" ]
-    }
-    
-    check_if_socket_alive ()
-    {
-        timeout 1 $SSH_BIN -S ${SSH_SOCKET} $USER@$SSH_HOST true > /dev/null
-    }
-    
-    start_socket ()
-    {
-        dtach_command="${DTACH} -n ${DTACH_SOCKET} ${SSH_BIN} -M -S ${SSH_SOCKET} ${USER}@${SSH_HOST}"
-        command -v ${DTACH} &>/dev/null && ${dtach_command} || 
-        echo "${DTACH} not installed"
-    }
-    
-    notmuch_run ()
-    {
-        check_for_socket || start_socket
-        CMD=$1
-        shift
-        printf -v ARGS "%q " "$@"
-        $SSH_BIN -S $SSH_SOCKET $USER@$SSH_HOST $NOTMUCH_REMOTE_BIN ${CMD} ${ARGS}
-    }
-    
-    notmuch_run $@
+        #!/usr/bin/env bash
 
+        SSH_BIN="ssh"
+        USER="example_user"
+        SSH_HOST="example.com"
+        SOCKET_DIR="/tmp/notmuch_$(id -u)"
+        SSH_SOCKET="${SOCKET_DIR}/ssh.socket"
+        NOTMUCH_REMOTE_BIN="notmuch"
+        DTACH="/usr/bin/dtach"
+        DTACH_SOCKET="${SOCKET_DIR}/dtach.socket"
+        
+        check_for_socket_dir ()
+        {
+            [ -d "${SOCKET_DIR}" ]
+        }
+        
+        check_socket_dir_owner_and_perm ()
+        {
+            [ "$(stat -c %U ${SOCKET_DIR})" = "$(whoami)" ] &&
+            [ "$(stat -c %a ${SOCKET_DIR})" = "700" ]
+        }
+        
+        create_socket_dir ()
+        {
+            mkdir "${SOCKET_DIR}"
+            chmod 700 "${SOCKET_DIR}"
+        }
+        
+        check_for_socket ()
+        {
+            [ -S "${SSH_SOCKET}" ]
+        }
+        
+        start_socket ()
+        {
+            dtach_command="${DTACH} -n ${DTACH_SOCKET} ${SSH_BIN} -M -S ${SSH_SOCKET} ${USER}@${SSH_HOST}"
+            command -v ${DTACH} &>/dev/null && ${dtach_command}
+        }
+        
+        notmuch_run ()
+        {
+            if check_for_socket_dir; then
+                if check_socket_dir_owner_and_perm; then
+                    if ! check_for_socket; then
+                        start_socket
+                    fi
+                else echo "Wrong permissions of ${SOCKET_DIR}" >&2
+                    exit 1
+                fi
+            elif create_socket_dir; then
+                start_socket
+            else
+                exit 1
+            fi
+            printf -v ARGS "%q " "$@"
+            $SSH_BIN -S $SSH_SOCKET $USER@$SSH_HOST $NOTMUCH_REMOTE_BIN ${ARGS}
+        }
+        
+        notmuch_run "$@"
        
 Save this to a file, "remote-notmuch.sh", in your path.