qemush : réécriture de la fonction attach

README.md

@@ -39,18 +39,23 @@ on disk
 - **Process detachment**: you can log out and have your virtual machines
 still running, control them via Unix sockets
 
+## Is it better than `libvirt` ?
+
+No. `qemush` and `libvirt` are for different use cases. `qemush` will allow you to spin up virtual machines really fast and with as little setup as possible, and aims to be nothing more than a QEMU wrapper, while `libvirt` will offer better out-of-the-box experience, with already existing pre-configurations, associated tools like the `virt-manager` GUI and a friendlier process supervision. You should use `qemush` if you care about controlling every aspect of your virtual machines, and are already used to using bare QEMU without an abstraction layer.
+
 ## Dependencies
 
+From version 0.9.0, `qemush` is written in pure POSIX shell! The previous dependency on `bash` was removed in consequence.
+
 All dependencies are common packages for a distribution, you'll be able to
 grab them from your favorite packages sources.
 
 - `qemu` - this is literally a QEMU wrapper so there's a chance you'll
 need it
-- `bash` - the `qemush` interpreter
+- A POSIX compliant shell - `bash` (POSIX mode), `*ash`, `*ksh` are POSIX shells
 - `coreutils` - used for basic OS operations
 - `sudo` - execute commands as `qemu`
 - `socat` - monitor machines via Unix sockets
-- `pathof` - see [Installation instructions](#installation-instructions)
 - any text editor - used for builtin function to edit launching scripts
 
 ## Installation instructions

bin/qemush

@@ -1,5 +1,5 @@
-#!/usr/bin/env bash
-# version=0.8.0
+#!/usr/bin/env sh
+# version=0.10.0
 
 # Re-exec the script as qemu via sudo (only if needed)
 [ "$(whoami)" != qemu ] && exec sudo -E -H -u qemu -- "$0" "$@"
@@ -10,7 +10,6 @@ PATH="${HOME}/launchers:${HOME}/bin:${PATH}"
 # Aliases
 alias ls='ls --color=auto'
 alias exec='exec '
-shopt -s expand_aliases
 
 # Set a restrictive umask to make sure qemu user files are private
 umask 7027
@@ -27,19 +26,19 @@ public_help() {
     exec cat << EOF
 ${name}: usage:
   ${name} running                          - (default behaviour) list running VMs
+  ${name} ls                               - list available VMs
+  ${name} add <path to script> [<VM name>] - add a launching script
+  ${name} edit <VM name>                   - edit VM launching script
   ${name} start <VM name>                  - start a VM
   ${name} attach <VM name>                 - attach to the VM monitor socket
-  ${name} ls                               - list available VMs
-  ${name} edit <VM name>                   - edit VM launching script
   ${name} rm <VM name>                     - delete launch script
   ${name} diskls                           - list available disk images
   ${name} diskadd <disk name> <size>       - create a disk image
   ${name} diskrm <disk name>               - delete disk image
   ${name} shell                            - start a shell as user qemu
-  ${name} help                             - show this help
-  ${name} add <path to script> [<VM name>] - add a launching script
-  ${name} do <command>                     - run shell input as user qemu
+  ${name} do <shell code>                  - run shell input as user qemu
   ${name} spice <running VM> [<TCP port>]  - expose a SPICE socket to TCP
+  ${name} help                             - show this help
 EOF
 }
 
@@ -69,9 +68,19 @@ public_start() {
 # Attach to a running virtual machine output, the latest opened if no
 # argument is provided
 public_attach() {
-    export QEMUSH_NAME="$1"
+    export QEMUSH_NAME
 
-    exec socat -,rawer,escape=15 "UNIX-CONNECT:$(pathof socket)"
+    if [ -n "$1" ]; then
+        QEMUSH_NAME=$1
+        socket_path=$(pathof socket)
+    else
+        socket_path=$(find ~/sockets/monitors -type s -printf '%T@ %p\n' | sort -r -n | head -1 | cut -d \  -f 2-)
+        QEMUSH_NAME=$(basename "$socket_path")
+    fi
+
+    printf 'Attaching to \033[1m%s\033[0m, escape with C-d (EOF)\n' "$QEMUSH_NAME"
+    socat -,rawer,escape=4 "UNIX-CONNECT:${socket_path}"
+    echo
 }
 
 # List running virtual machines
@@ -193,23 +202,17 @@ public_spice() {
         socat TCP-LISTEN:"${port},reuseaddr,fork" UNIX-CLIENT:"$(pathof spice)"
 }
 
-function_exists() {
-    declare -F \
-        | cut -d \  -f 3- \
-        | grep '^public_' \
-        | sed 's/^public_//' \
-        | grep -q "^${1}\$"
-}
+case "$1" in
+    "")
+        public_running
+        ;;
+    running|ls|add|edit|start|attach|rm|diskls|diskadd|diskrm|shell|do|spice|help)
+        function=$1
+        shift
 
-# Defauts to `active` if no function is supplied; else checks for a public
-# function named after the argument; else fails
-if [ -z "$1" ]; then
-    public_running
-elif function_exists "$1"; then
-    function=$1
-    shift
-
-    "public_${function}" "$@"
-else
-    error_usage
-fi
+        "public_${function}" "$@"
+        ;;
+    *)
+        error_usage
+        ;;
+esac