Hi Bastian,
On Sat, Apr 10, 2021 at 01:39:15PM +0200, Bastian Blank wrote:
> Exactly, it requires working udev and udev rules for it's primary
> function. To change that, it either needs
I fear that you still get "primary function" wrong. In many cases, the
primary function of a shared library is being able to load it and then
not calling any of its functions. It may be unfortunate, but that's how
we integrate optional features from shared libraries.
> - to be split into two libraries, one with the stuff that needs udev
> rules, one for the stuff without or
> - runtime detection if udev can work.
Or maybe it can quite simply fail to work if the udev rules are not
invoked. Demoting the dependency is not a regression in this aspect as
libdevmapper1.02.1 already does not depend on udev, so there already is
no requirement on invoking the udev rules. I'm just asking for also
skipping dmsetup.
> Maybe. Please provide a patch to fix this problem, without touching
> every piece of software that, directly or indirectly, links against
> libdevmapper.
I'm attaching the obvious patch. I think that we don't actually need to
touch other pieces of software, because it is quite difficult to get a
system without dmsetup. This bug is not about making many systems lack
dmsetup, but about making it possible at all.
* dmsetup is still recommended by libdevmapper1.02.1, so you need to
turn off Recommends.
* dmsetup is pulled by lvm2 and cryptsetup.
* Given that systemd is important and transitively depends on dmsetup
at present, we can elevante dmsetup's priority without regressing
anything. That way it remains part of a default debootstrap.
* The actual bug that introduced the dmsetup dependency was about a
mismatched version of dmsetup and libdevmapper1.02.1. Such a
situation is prevented by suitable Breaks.
> Because the dependency on libdevmapper1.02.1 can only go after systemd
> (or maybe libcryptsetup) got it.
Neither actually need it unconditionally. We really want to be able to
install systemd without dmsetup. That's the highlevel goal of this bug
here.
Helmut
diff --minimal -Nru lvm2-2.03.11/debian/changelog lvm2-2.03.11/debian/changelog
--- lvm2-2.03.11/debian/changelog 2021-02-22 22:39:14.000000000 +0100
+++ lvm2-2.03.11/debian/changelog 2021-04-10 17:14:20.000000000 +0200
@@ -1,3 +1,12 @@
+lvm2 (2.03.11-2.2) UNRELEASED; urgency=medium
+
+ * Non-maintainer upload.
+ * Demote libdevmapper1.02.1 -> dmsetup dependency to versioned Breaks +
+ Recommends. Increase its priority to important to remain in a default
+ debootstrap. (closes: #986652)
+
+ -- Helmut Grohne <hel...@subdivi.de> Sat, 10 Apr 2021 17:14:20 +0200
+
lvm2 (2.03.11-2.1) unstable; urgency=medium
* Non-maintainer upload.
diff --minimal -Nru lvm2-2.03.11/debian/control lvm2-2.03.11/debian/control
--- lvm2-2.03.11/debian/control 2021-02-22 22:39:14.000000000 +0100
+++ lvm2-2.03.11/debian/control 2021-04-10 17:14:20.000000000 +0200
@@ -144,7 +144,10 @@
Depends:
${shlibs:Depends},
${misc:Depends},
- dmsetup (>= ${devmapper:Version}~),
+Breaks:
+ dmsetup (<< ${devmapper:Version}~),
+Recommends:
+ dmsetup,
Multi-Arch: same
Description: Linux Kernel Device Mapper userspace library
The Linux Kernel Device Mapper is the LVM (Linux Logical Volume Management)
@@ -183,6 +186,7 @@
${shlibs:Depends},
${misc:Depends},
Multi-Arch: foreign
+Priority: important
Description: Linux Kernel Device Mapper userspace library
The Linux Kernel Device Mapper is the LVM (Linux Logical Volume Management)
Team's implementation of a minimalistic kernel-space driver that handles
