Move the fallback on providers from backend to frontend.

This reverts commit e28973169d2e5eda8b64ebdda11ece0dc761d978.
This code might fit better in the frontend than in the backend finally.
Ref: http://www.archlinux.org/pipermail/pacman-dev/2007-November/010150.html

I also changed it for fixing FS#8763 :
if there is exactly one provider, pacman will pull it and print a warning.
if there are several providers, pacman will list them and fail. It's up to
the user to pick one. Add sync501 pactest to reflect that.

1 files changed, 15 insertions, 0 deletions

diff --git a/pactest/tests/sync501.py b/pactest/tests/sync501.py
new file mode 100644
index 00000000..fa5f3688
--- /dev/null
+++ b/pactest/tests/sync501.py
@@ -0,0 +1,15 @@
+self.description = "-S provision"
+
+sp = pmpkg("pkg1")
+sp.provides = ["provision 1.0-1"]
+self.addpkg2db("sync", sp)
+
+sp = pmpkg("pkg2")
+sp.provides = ["provision 1.0-1"]
+self.addpkg2db("sync", sp)
+
+self.args = "-S provision"
+
+self.addrule("PACMAN_RETCODE=1")
+self.addrule("!PKG_EXIST=pkg1")
+self.addrule("!PKG_EXIST=pkg2")