Libguestfs - Mar 2017 - [PATCH 4/4] p2v: virt-p2v-make-disk: prevent daemons to run on Debian

Hi,

this small series fixes the generation of Debian-based images using
virt-p2v-make-disk.  With this series, the image can boot fine, X is
started, and the p2v interface appears.  I haven't tried an actual
conversion, but I don't think there are Debian-specific problems
preventing that.

Thanks,

Pino Toscano (4):
  p2v: fix Gtk dependencies on Debian
  p2v: remove network-manager-applet Debian dependency
  p2v: virt-p2v-make-disk: fix systemd paths
  p2v: virt-p2v-make-disk: prevent daemons to run on Debian

 p2v/dependencies.m4       |  3 +--
 p2v/virt-p2v-make-disk.in | 21 ++++++++++++++++++---
 2 files changed, 19 insertions(+), 5 deletions(-)

-- 
2.9.3

On Debian, the names of the packages containing the Gtk 2 and 3
libraries have different patterns, and thus just the name will not work
for Gtk 3.

Apply a bit of m4 to use a different package name on Gtk 2 and other
versions.  It can be easily adapted to new models in future Gtk 4+,
should the naming pattern change from Gtk 3.
---
 p2v/dependencies.m4 | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/p2v/dependencies.m4 b/p2v/dependencies.m4
index 2037477..3160dce 100644
--- a/p2v/dependencies.m4
+++ b/p2v/dependencies.m4
@@ -64,7 +64,7 @@ ifelse(REDHAT,1,
 ifelse(DEBIAN,1,
   libpcre3
   libxml2
-  libgtk`'GTK_VERSION`'.0-0
+ 
ifelse(GTK_VERSION,2,libgtk`'GTK_VERSION`'.0-0,libgtk-`'GTK_VERSION`'-0)
   libdbus-1-3
   ifdef(`HAVE_LIBVIRT', `libvirt0')
   openssh-client
-- 
2.9.3

On Debian, network-manager-gnome contains nm-applet, which is what
launch-virt-p2v spawns.  network-manager-gnome is already in the list of
packages for Debian, while network-manager-applet does not exist.
---
 p2v/dependencies.m4 | 1 -
 1 file changed, 1 deletion(-)

diff --git a/p2v/dependencies.m4 b/p2v/dependencies.m4
index 3160dce..0db2f85 100644
--- a/p2v/dependencies.m4
+++ b/p2v/dependencies.m4
@@ -78,7 +78,6 @@ ifelse(DEBIAN,1,
   metacity
   network-manager
   network-manager-gnome
-  network-manager-applet
   dbus-x11
   net-tools
 )
-- 
2.9.3

Usually systemd is configured with prefix=/, so units are in
/lib/systemd.  On a system with UsrMove, such as Fedora/RHEL7, /lib is
a symlink to /usr/lib, so both /lib/systemd and /usr/lib/systemd work;
OTOH, on non-UsrMove systems, such as Debian, the two paths are
different locations, and thus trying to edit system files as
/usr/lib/systemd/etc will fail.

As solution, just reference /lib/systemd for systemd files.
---
 p2v/virt-p2v-make-disk.in | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/p2v/virt-p2v-make-disk.in b/p2v/virt-p2v-make-disk.in
index 6b7f15a..6b82eaf 100644
--- a/p2v/virt-p2v-make-disk.in
+++ b/p2v/virt-p2v-make-disk.in
@@ -241,9 +241,9 @@ virt-builder "$osversion"                         
\
     --chmod 0755:/usr/bin/launch-virt-p2v                       \
     --upload "$datadir"/p2v.service:/etc/systemd/system/        \
     --mkdir /etc/systemd/system/default.target.wants            \
-    --link
/usr/lib/systemd/system/multi-user.target:/etc/systemd/system/default.target \
+    --link
/lib/systemd/system/multi-user.target:/etc/systemd/system/default.target \
     --link
/etc/systemd/system/p2v.service:/etc/systemd/system/default.target.wants/p2v.service
\
-    --edit '/usr/lib/systemd/system/getty@.service:
+    --edit '/lib/systemd/system/getty@.service:
         s/^ExecStart=(.*)/ExecStart=$1 -a root/
     '                                                           \
     --edit '/etc/systemd/logind.conf:
-- 
2.9.3

On Debian systems, usually daemons are run automatically after their
installations; since we are upgrading the template, and installing
packages such as openssh, network-manager, etc, this may cause few
daemon to stay running during the virt-builder execution, causing it to
fail when shutting down (since e.g. /sysroot/dev would be in use).

As workaround, use a temporary policy-rc.d policy layer [1]: give an
error code so no daemon is ever started at any point of package upgrades
and installation.  The script is removed at the very end of the
building, so the final image will spawn daemons just fine when booted.

[1] https://people.debian.org/~hmh/invokerc.d-policyrc.d-specification.txt
---
 p2v/virt-p2v-make-disk.in | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/p2v/virt-p2v-make-disk.in b/p2v/virt-p2v-make-disk.in
index 6b82eaf..026d18b 100644
--- a/p2v/virt-p2v-make-disk.in
+++ b/p2v/virt-p2v-make-disk.in
@@ -189,6 +189,19 @@ EOF
         ;;
     debian-*|ubuntu-*)
         depsfile="$datadir/dependencies.debian"
+        cat > $tmpdir/policy-rc.d <<'EOF'
+#!/bin/sh
+# Avoid running daemons during the upgrade/installation
+exit 101
+EOF
+        chmod +x $tmpdir/policy-rc.d
+        # Double quotes because we want $tmpdir to be expanded:
+        preinstall_args="
+          --upload $tmpdir/policy-rc.d:/usr/sbin/policy-rc.d
+        "
+        final_args="
+          --delete /usr/sbin/policy-rc.d
+        "
         ;;
     archlinux-*)
         depsfile="$datadir/dependencies.archlinux"
@@ -229,6 +242,7 @@ virt-builder "$osversion"                         
\
     $verbose_option						\
     --output "$output"                                          \
     $arch_option						\
+    $preinstall_args                                            \
     --update                                                    \
     --install "$install"                                        \
     --root-password password:p2v                                \
@@ -251,7 +265,8 @@ virt-builder "$osversion"                         
\
     '                                                           \
     $upload                                                     \
     $extra_args                                                 \
-    "${passthru[@]}"
+    "${passthru[@]}"                                            \
+    $final_args
 
 # We have to do this so the cleanup() handler runs.
 exit $?
-- 
2.9.3

ACK series.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
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