Libguestfs - Jul 2015 - Re: [PATCH 2/2] Make sure gpg-agent is terminated before umount

Here are two patches: one fixes the gpg-agent causing unmount to fail
after running dnf to install packages. The other ones fixes dhcpcd call
in the init program to provide it an interface name.

Cédric Bosdonnat (2):
  appliance init: find NIC name for dhcpcd
  Make sure gpg-agent is terminated before umount

 appliance/init             | 3 ++-
 customize/customize_run.ml | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

-- 
2.1.4

dhcpcd requires an interface name as parameter to work. We are now
getting it from /proc/sys/net/ipv4/conf/ folder children.
---
 appliance/init | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/appliance/init b/appliance/init
index cca62e7..ef18959 100755
--- a/appliance/init
+++ b/appliance/init
@@ -111,7 +111,8 @@ if test "$guestfs_network" = 1; then
     if dhclient --version >/dev/null 2>&1; then
         dhclient
     else
-        dhcpcd
+        iface=$(ls -I all -I default -I lo /proc/sys/net/ipv4/conf)
+        dhcpcd $iface
     fi
 fi
 
-- 
2.1.4

gpg-agent uses /sysroot/dev/null and thus /sysroot/dev can't be
unmounted if gpg-agent is still around. Note that this problem only
affects installing packages on fedora-22 guests.
---
 customize/customize_run.ml | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/customize/customize_run.ml b/customize/customize_run.ml
index bce0aca..81b0951 100644
--- a/customize/customize_run.ml
+++ b/customize/customize_run.ml
@@ -96,7 +96,8 @@ exec >>%s 2>&1
         apt-get $apt_opts install %s
       " quoted_args
     | "dnf" ->
-      sprintf "dnf -y install %s" quoted_args
+      sprintf "dnf -y install %s
+               pkill gpg-agent" quoted_args
     | "pisi" ->
       sprintf "pisi it %s" quoted_args
     | "pacman" ->
-- 
2.1.4

On Tuesday 28 July 2015 15:21:37 Cédric Bosdonnat wrote:
> dhcpcd requires an interface name as parameter to work. We are now
> getting it from /proc/sys/net/ipv4/conf/ folder children.
> ---
>  appliance/init | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/appliance/init b/appliance/init
> index cca62e7..ef18959 100755
> --- a/appliance/init
> +++ b/appliance/init
> @@ -111,7 +111,8 @@ if test "$guestfs_network" = 1; then
>      if dhclient --version >/dev/null 2>&1; then
>          dhclient
>      else
> -        dhcpcd
> +        iface=$(ls -I all -I default -I lo /proc/sys/net/ipv4/conf)
> +        dhcpcd $iface
I'm noticing the same issue (not requesting for any interface) also on
a current Debian/testing system, which uses isc-dchp (dhclient).

I'd say that might be better to just extend this also to dhclient, so
passing the network interface to whichever dhcp client is used on the
appliance. At least, this seems to not break things on Debian/testing
and Fedora/21 (both using dhclient).

-- 
Pino Toscano

On Tuesday 28 July 2015 15:21:38 Cédric Bosdonnat wrote:
> gpg-agent uses /sysroot/dev/null and thus /sysroot/dev can't be
> unmounted if gpg-agent is still around. Note that this problem only
> affects installing packages on fedora-22 guests.
> ---
>  customize/customize_run.ml | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/customize/customize_run.ml b/customize/customize_run.ml
> index bce0aca..81b0951 100644
> --- a/customize/customize_run.ml
> +++ b/customize/customize_run.ml
> @@ -96,7 +96,8 @@ exec >>%s 2>&1
>          apt-get $apt_opts install %s
>        " quoted_args
>      | "dnf" ->
> -      sprintf "dnf -y install %s" quoted_args
> +      sprintf "dnf -y install %s
> +               pkill gpg-agent" quoted_args
>      | "pisi" ->
>        sprintf "pisi it %s" quoted_args
>      | "pacman" ->
NACK to this patch, as it just sweeps the issue under the carpet.

Basically, this is triggered by the following:
  $ virt-builder fedora-22 --install <whatever>
gnupg2 (used to import keys the first time when installing packages
from a repository) requires the use of an agent, thus spawning
gnupg-agent which holds /sysroot/dev, which cannot be unmounted.

It seems that this issue has been fixed in recent versions of
gnupg2/rpm/dnf, so updating before installing anything:
  $ virt-builder fedora-22 --update --install <whatever>
which should then work (at least it does for me).

Rich, if this fixes the problem for you as well, would it be possible
to update the fedora-22 templates with newer versions of packages?

Thanks,
-- 
Pino Toscano