Bugs for Sorcery are reported here

[bugzilla-daemon AT bugs.sourcemage.org]

http://bugs.sourcemage.org/show_bug.cgi?id=14389

           Summary: On re-cast, a failed install phase should not leave
                    system without essential components.
           Product: Sorcery
           Version: 1.13.x
          Platform: Other
        OS/Version: other
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Cast
        AssignedTo: sm-sorcery-bugs AT lists.ibiblio.org
        ReportedBy: eekee57 AT fastmail.fm


A while ago a little problem with installing udev left my system without an
installed udev. For some reason I didn't notice the cast had failed, probably
because it was one of many in a system-upgrade and I simply forgot about it 
for
a while. In bug #14388 Patrick Ensign discovers that a failed cast of bash can
leave his system withut bash! I propose a little mechanism to avoid the bad
consequences of a failed cast.

Install behaviour in stable sorcery may be shown in the following pseudocode:

If compile was successful:
    dispel spell
    install spell
    If install was successful:
        report success
    Else:
        report error
    End if
End If

I propose to add a step:

If compile was successful:
    dispel spell
    install spell
    If install was successful:
        report success
    Else:
        revert dispel (dispel -d spell last-installed-version)
        report error
    End if
End If

I propose particularly to make the change for sustained spells. I think it 
would
be a nice idea for all spells, but am not sure.

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