feat(webfuse): add multiclient support (#23)

* fixes verbosity option when set through command line

* adds support for build type and allows to run gdb in container

* adds missing toolchain headers to project

* renames container macros

* adds gdbserver

* fixes verbosity option when set through command line

* adds support for build type and allows to run gdb in container

* adds missing toolchain headers to project

* renames container macros

* adds gdbserver

* removes language settings, which contains alternating values

* adds wrapper script to launch gdbserver

* fix docker command in wrapper script

* fixes run in dind setup

* replaces docker's init through dump-init

* moves filesystem to session

* fixes verbosity option when set through command line

* adds support for build type and allows to run gdb in container

* renames container macros

* adds gdbserver

* fixes verbosity option when set through command line

* adds support for build type and allows to run gdb in container

* renames container macros

* adds gdbserver

* adds wrapper script to launch gdbserver

* fix docker command in wrapper script

* fixes run in dind setup

* replaces docker's init through dump-init

* moves filesystem to session

* adds container_of

* added dlist

* allows multiple clients to connect

* removes directory when session is closed

* adds dependecy to uuid-dev

* allow clients to register filesystems

* updates documentation

* moves mountpoint handling into filesystem: mountpoints are removed during session cleanup

* adds filesystem name/id to request parameters

* fixes security issue: add_filesystem did not check name

* removes default link, if it is broken

* recreates symlink "default", if filesystem is gone

* updates documentation

* fixes memory leak

* makes authentication work .. again

* updates provider to support changed protocol

* removes execute right of hello.txt

* fixes style issues

* fixes javascript style issues

* fixes flase positive from Flawfinder

* fixes some javascript style issues

* removes use of PATH_MAX

* removes use of GNU extensions in container_of implementation

* ignores findings of flawfinder

* replaces dlist by slist

* removes duplicate implementation of slist (message_queue)

doc/authenticate.uml

@@ -1,12 +1,10 @@
 @startuml
 participant "Filesystem Provider\n(e.g. Webbrowser)" as provider
 participant "webfuse\ndaemon" as daemon
-actor "user" as user
 
-group directory listing fails without authentication
-user     -> daemon : ls
-daemon   -> daemon : is_authenticated
-daemon   -->x user : error: no entry
+group add filesystem fails without authentication
+provider -> daemon : add_filesystem
+daemon   -->x provider : error: access denied
 end
 
 
@@ -17,12 +15,10 @@ daemon -> daemon: check(credentials)
 daemon --> provider: result
 end
 
-group directory listing succeeds after authentication
-user     -> daemon : ls
-daemon   -> daemon : is_authenticated
-daemon   -> provider : readdir
-provider --> daemon : readdir_resp
-daemon   --> user : [., ..]
+group add filesystem succeeds after authentication
+    provider -> daemon: add_filesystem
+    daemon -> daemon : fuse_mount
+    daemon -> provider: okay
 end
 
 @enduml

doc/concept.uml

@@ -4,7 +4,6 @@ participant "webfuse\ndaemon" as daemon
 actor "user" as user
 
 group startup
-daemon -> daemon : fuse_mount
 daemon -> daemon : start ws
 end
 ...
@@ -16,9 +15,15 @@ provider -> daemon : connect
     daemon -> daemon: check credentials
     daemon --> provider: okay
     end
+
+    provider -> daemon: add_filesystem
+    daemon -> daemon : fuse_mount
+    daemon -> provider: okay
+
 end
 ...
 
+
 group directory listing
 user     -> daemon : ls
 daemon   -> provider : readdir

doc/filesystem.uml

@@ -0,0 +1,16 @@
+@startuml
+
+salt
+{
+{T
++ mount_point
+++ fwupdate
++++ default -> 7c029f81-6bdf-4d3c-82dc-26f748164012
++++ 7c029f81-6bdf-4d3c-82dc-26f748164012
+++++ update.raucb
++++ f93de23b-4535-4a47-a287-a381b78a11b8
+++++ update.raucb
+}
+}
+
+@enduml