dnf stdout messages differ from yum. Handle this particular difference
(info about last metadata check time), but in addition properly use its
exit code - 0 means no updates, 100 means some updates.
FixesQubesOS/qubes-issues#2096
Since yum-deprecated is slowly removed from Fedora (in Fedora 23 is not
installed by default), we're forced to migrate to dnf. The main problem
with dnf here is lack of --downloaddir option
(https://bugzilla.redhat.com/show_bug.cgi?id=1279001). As nobody is
going to implement it, simply extract downloaded packages from cache
directory (thanks to provided config file, it is always /var/cache/yum).
This basically replaces "dom0-updates: use yum-deprecated instead of dnf
in all calls" with a set of workarounds for dnf missing parts.
Related to QubesOS/qubes-issues#1574
Check `yum check-update` exit code, instead of `grep` - when there are
multiple commands on the single line, $? contains exit code of the last
executed.
FixesQubesOS/qubes-issues#1475
Depending on yum version, adding '-q' option may hide not only
informational messages, but also updates list. This is especially the
case for yum-deprecated in Fedora 22.
So instead of '-q' option, filter the output manually.
QubesOS/qubes-issues#1282
Fix for d44c8ac "dom0-updates: prefer yum-deprecated over dnf"
Because of slightly different options and config syntax, it needs to be
used in call calls, not only the one with --downloaddir option.
QubesOS/qubes-issues#1282
Some of the reasons:
- dnf doesn't support --downloaddir option
- dnf doesn't support `copy_local` repo option (used in automated tests
only)
- dnf is horribly slow, especially without cache fetched
(https://bugzilla.redhat.com/show_bug.cgi?id=1227014)
This is all needed (instead of simply using `yum` command), because
Fedora >= 22 have an command redirection `yum`->`dnf`.
QubesOS/qubes-issues#1282
Restore support for older yum: no --downloadonly option, so use
yumdownloader.
Also add some a code to handle some Debian quirks - especially default
rpmdb location in user home...
This better handles dependencies (especially of "Obsolete:" type).
Unfortunately yum install/upgrade checks if running as root. Because we
are only downloading packages, using local "system root" (--installroot
option) no real root access is requires, so use fakeroot to mute yum
error.
Get rid of underscores in filenames, use dashes instead.
This is first part of cleanup in filenames.
"qubes_rpc" still untouched - will be in separate commit.
