Contract file to mount iso?

Question

What would be the content of a .contract file in /usr/share/contractor for a menu entry like 'Mount iso'?

Answer 1

Having installed gnome-disk-utility I already had Open With > Disc Image Mounter in context menu and a gnome-desk-image-mounter.desktop file in /usr/share/applications. Looking into that, I have created a .contract file that works with the same consequence (and so is a bit pointless, adding nothing, although answers the question):

sudo gedit /usr/share/contractor/mount_iso.contract

With:

[Contractor Entry]
Name=Mount 
Icon=drive-removable-media
Description=Mount ISO file 
MimeType=application/x-cd-image;application/x-raw-disk-image
Exec=gnome-disk-image-mounter %f
Terminal=false
StartupNotify=false
Type=Application
NoDisplay=true
X-Ubuntu-Gettext-Domain=gnome-disk-utility

Just like with Disc Image Mounter, the image is not yet mounted, but added to the file manager sidebar list of drives and mounted from there

Answer 2

Can't guarantee that it'll work, but something along the lines of this:

[Contractor Entry]
Name=Mount ISO
Icon=ubiquity
Description=Mount ISO file to /mnt
MimeType=application/iso-image
Exec=pkexec mount -o loop %f /mnt

Some notes:

• icons are found at /usr/share/icons/elementary. You can just put the appropriate name in.
• the exec part is the relevant one. pkexec uses polkit to authorize an action that will require administrative privileges, such as using mount. If you want to put more effort into it, you may be able to use GNOME's mounting services to mount without using your password. %f will be replaced by the file's path.
• since a contract only gets a file as argument, you can't specify the location. So you must either invoke a dialog (cheap solution would be a bash-invokable program like zenity) to ask for the location or use a default one, like /mnt
• Maybe check the mime type, I don't have an ISO file handy to check it right now. Just right click and go to properties to find out.