symlink enhancements

* runon -l now install symlink
* install -u now removes all found symlinks to runon

README.md

@@ -78,8 +78,7 @@ simply pass `-u` to install command you have used, eg.:
 
 you can create soft links to `runos` to simplify calls:
 
-    cd /usr/local/bin
-    ln -s runon centos7
+    runos centos7 -l
 
 now calling `centos7 ...` is equivalent to call `runos centos7 ...`:
 

install

@@ -66,6 +66,14 @@ while [ $# -gt 0 ]; do
     shift
 done
 
+bin_dir=$(realpath $bin_dir)
+config_dir=$(realpath $config_dir)
+
+if [[ ":$PATH:" != *":$bin_dir:"* ]]; then
+    echo "WARNING: $bin_dir is not in your PATH, runon will not be automatically found."
+    echo
+fi
+
 set -e
 
 if [ "$op" = "install" ]; then
@@ -81,6 +89,13 @@ elif [ "$op" = "installdev" ]; then
     do_exec ln -s -f $(realpath runon) $bin_dir/
     do_exec ln -s -f $(realpath runon.conf) $config_dir/
 elif [ "$op" = "uninstall" ]; then
+    # find all symlinks targetting to runon, and remove them
+    find $bin_dir -type l | while read l; do
+        if [ "$(readlink $l)" = "runon" ]; then
+            do_exec rm $l
+        fi
+    done
+
     do_exec rm -f $bin_dir/runon
     do_exec rm -f $config_dir/runon.conf
     test -d $bin_dir && do_exec rmdir --parents --ignore-fail-on-non-empty $bin_dir 2> /dev/null

runon

@@ -16,7 +16,11 @@ import subprocess
 from pprint import pprint
 
 
-def load_config(user_confname, osname):
+def natural_sortkey(string):
+    tokenize = re.compile(r'(\d+)|(\D+)').findall
+    return tuple(int(num) if num else alpha for num, alpha in tokenize(string))
+
+def read_ini(user_confname, osname=''):
     ini_list = [ 'runon.conf', '.runon.conf', os.path.join(xdg.BaseDirectory.xdg_config_home, 'runon', 'runon.conf'), '/etc/runon/runon.conf' ]
     defaults = {
         'osname': osname,
@@ -26,6 +30,14 @@ def load_config(user_confname, osname):
         ini_list.insert(0, user_confname)
     ini = configparser.ConfigParser(defaults=defaults, interpolation=configparser.ExtendedInterpolation())
     ini.read(ini_list)
+    return ini
+
+def list_osnames(user_confname):
+    ini = read_ini(user_confname)
+    return ini.sections()
+
+def load_config(user_confname, osname):
+    ini = read_ini(user_confname, osname)
     if not ini.has_section(osname):
         print('ERROR: cannot find configuration for distribution "{}"'.format(osname))
         sys.exit(1)
@@ -44,6 +56,13 @@ def load_config(user_confname, osname):
     return conf
 
 
+def make_osname_link(binpath, osname):
+    link = os.path.join(os.path.dirname(binpath), osname)
+    try:
+        os.symlink('runon', link)
+    except FileExistsError:
+        pass
+
 def make_image_name(osname):
     user = getpass.getuser()
     name = 'runon-{}-{}'.format(osname, user)
@@ -153,7 +172,9 @@ def main():
     else:
         parser.description = 'run commands on any distribution'
         parser.add_argument('osname',
-                            help = 'distribution name to run on')
+                            help = 'distribution name to run on, '
+                            '"list" to dump all available distributions')
+    parser.epilog = '(c) 2021 Gilles Grandou <gilles@grandou.net>'
 
     parser.add_argument('-v', '--verbose', action='store_true',
                         help='verbose output')
@@ -161,6 +182,8 @@ def main():
                         help='specify config file')
     parser.add_argument('-u', '--update', action='store_true',
                         help='force image update')
+    parser.add_argument('-l', '--link', action='store_true',
+                        help='create a symlink to call "osname" as a shortcut to "runon osname"')
     parser.add_argument('command', nargs='*', default=None,
                         help = 'command to execute')
 
@@ -168,8 +191,21 @@ def main():
     if osname:
         args.osname = osname
 
+    if args.osname == 'list':
+        osnames = list_osnames(args.config)
+        print('Available distributions:')
+        for o in sorted(osnames, key=natural_sortkey):
+            print('  {}'.format(o))
+        print()
+        if args.link:
+            for o in osnames:
+                make_osname_link(sys.argv[0], args.osname)
+        return 0
+
     client = docker.from_env()
     conf = load_config(args.config, args.osname)
+    if args.link:
+        make_osname_link(sys.argv[0], args.osname)
     image = build_image(client, conf, args.update, args.verbose)
     container = create_container(client, image, conf, args.command, args.verbose)
     ret = run_container(client, container)