[pacman-dev] UPGRADERM patch

[Nagy Gabor]

Hi!
> I think adding a special UPGRADERM type for this pseudo remove
> transaction is better than the previous fix which just added this
> check for eliminating duplicated required by :
> if(!alpm_list_find_str(rqdby, pkgname)) {
And don't forget that pacman can still corrupt the database, because
now it simply wants to add the requiredby entry instead of removing it.
To show this I provide a testfile:
====requiredby004.py====
self.description = "Upgrade a package that no longer need a depend"

lp1 = pmpkg("pkg1", "1.1-1")
lp1.depends = ["pkg2"]
self.addpkg2db("local", lp1)

lp2 = pmpkg("pkg2")
lp2.requiredby = ["pkg1"]
self.addpkg2db("local", lp2)

p = pmpkg("pkg1", "1.2-1")
self.addpkg(p)

self.args = "-U %s" % p.filename()

self.addrule("PACMAN_RETCODE=0")
self.addrule("PKG_EXIST=pkg1")
self.addrule("PKG_VERSION=pkg1|1.2-1")
self.addrule("PKG_EXIST=pkg2")
self.addrule("!PKG_REQUIREDBY=pkg2|pkg1")