pactest: removal of packages with unmet dependencies

Provide a package for removing packages with unmet dependencies.
Currently pacman removes too many packages from the transaction
(FS#30649).

Signed-off-by: Allan McRae <allan@archlinux.org>

test/pacman/tests/sync140.py

@@ -0,0 +1,28 @@
+self.description = "Sysupgrade with ignored package prevent other upgrade"
+
+lp1 = pmpkg("glibc", "1.0-1")
+lp2 = pmpkg("gcc-libs", "1.0-1")
+lp2.depends = ["glibc>=1.0-1"]
+lp3 = pmpkg("pcre", "1.0-1")
+lp3.depends = ["gcc-libs"]
+
+for p in lp1, lp2, lp3:
+	self.addpkg2db("local", p)
+
+sp1 = pmpkg("glibc", "1.0-2")
+sp2 = pmpkg("gcc-libs", "1.0-2")
+sp2.depends = ["glibc>=1.0-2"]
+sp3 = pmpkg("pcre", "1.0-2")
+sp3.depends = ["gcc-libs"]
+
+for p in sp1, sp2, sp3:
+	self.addpkg2db("sync", p)
+
+self.args = "-Su --ignore %s --ask=32" % sp1.name
+
+self.addrule("PACMAN_RETCODE=0")
+self.addrule("PKG_VERSION=glibc|1.0-1")
+self.addrule("PKG_VERSION=gcc-libs|1.0-1")
+self.addrule("PKG_VERSION=pcre|1.0-2")
+
+self.expectfailure = True