Make sure all dependencies for scriptlet are installed before executing them

[ffesti]

Right now scriptlets are executed during the installation/removal of the package they are contained in. This is a problem in case of dependency loops as scriptlets are executed while dependencies may not yet be installed. Although the problem is unsolvable in principle delaying the script execution until all files of the loop are put down on disk can make installation more robust and breakage more rare.

[ffesti]

I don't get the difference between inner and outer dependency loops. To be technically correct: RPM nowadays does not detect dependency loops any more but strongly connected components in the relation graph and we would postpone the scripts after all packages of the component have been installed. I only use "dependency loops" as this is the term most people are familiar with.

[cgwalters]

FWIW, in rpm-ostree today we lay out all files before executing scripts. Then we execute all %pre, then %post and %posttrans. Becuase of the %pre -> passwd dependency, we then do chowns after %pre. Also, speaking of dependency loops and scripts...

[JornUzon]

when I install dbus-daemon,install dbus-daemon before install shadow.so report useradd and groupadd command not found，and installtion failed. can I add shadow to setup.rpm 'Requires'? or can from rpm to solve this issue