[Libguestfs] [PATCH] Improve augeas error reporting
Matthew Booth
mbooth at redhat.com
Thu May 13 13:34:03 UTC 2010
Add a function to display more complete augeas errors if they occur. Update all
uses of augeas in GuestOS::RedHat to use it for error reporting.
---
lib/Sys/VirtV2V/GuestOS/RedHat.pm | 185 ++++++++++++++++++++++++-------------
1 files changed, 121 insertions(+), 64 deletions(-)
diff --git a/lib/Sys/VirtV2V/GuestOS/RedHat.pm b/lib/Sys/VirtV2V/GuestOS/RedHat.pm
index cf8787d..8b211f0 100644
--- a/lib/Sys/VirtV2V/GuestOS/RedHat.pm
+++ b/lib/Sys/VirtV2V/GuestOS/RedHat.pm
@@ -93,6 +93,59 @@ sub new
return $self;
}
+sub _augeas_error
+{
+ my $self = shift;
+ my ($err) = @_; # The original error message. We will emit this if there
+ # were no augeas errors.
+
+ my $g = $self->{g};
+
+ my $msg = "";
+
+ foreach my $error ($g->aug_match('/augeas/files//error')) {
+ $error =~ /^\/augeas\/files(\/.*)\/error$/
+ or die("Unexpected return from aug_match: $error");
+ my $file = $1;
+
+ my %detail;
+ foreach my $detail_path ($g->aug_match("$error//*")) {
+ $detail_path =~ /^$error\/(.*)$/
+ or die("Unexpected return from aug_match: $detail_path");
+ $detail{$1} = $g->aug_get($detail_path);
+ }
+
+ if (defined($detail{message})) {
+ $msg .= __x("augeas error for {file}: {error}",
+ file => $file,
+ error => $detail{message})."\n";
+ } else {
+ $msg .= __x("augeas error for {file}",
+ file => $file)."\n";
+ }
+
+ if (defined($detail{pos}) && defined($detail{line}) &&
+ defined($detail{char}))
+ {
+ $msg .= __x("error at line {line}, char {char}, file ".
+ "position {pos}",
+ line => $detail{line},
+ char => $detail{char},
+ pos => $detail{pos})."\n";
+ }
+
+ if (defined($detail{lens})) {
+ $msg .= __x("augeas lens: {lens}",
+ lens => $detail{lens})."\n";
+ }
+ }
+
+ chomp($msg);
+
+ die(user_message($msg)) if (length($msg) > 0);
+ die($err);
+}
+
# Handle SELinux for the guest
sub _init_selinux
{
@@ -185,7 +238,7 @@ sub _init_augeas
};
# The augeas calls will die() on any error.
- die($@) if($@);
+ $self->_augeas_error($@) if ($@);
}
=item enable_kernel_module(device, module)
@@ -209,7 +262,7 @@ sub enable_kernel_module
};
# Propagate augeas errors
- die($@) if($@);
+ $self->_augeas_error($@) if ($@);
}
=item update_kernel_module(device, module)
@@ -242,7 +295,7 @@ sub update_kernel_module
};
# Propagate augeas errors
- die($@) if($@);
+ $self->_augeas_error($@) if ($@);
}
=item disable_kernel_module(device)
@@ -275,7 +328,7 @@ sub disable_kernel_module
};
# Propagate augeas errors
- die($@) if($@);
+ $self->_augeas_error($@) if ($@);
}
=item update_display_driver(driver)
@@ -303,7 +356,7 @@ sub update_display_driver
};
# Propagate augeas errors
- die($@) if($@);
+ $self->_augeas_error($@) if ($@);
}
# We can't rely on the index in the augeas path because it will change if
@@ -333,7 +386,7 @@ sub _check_augeas_device
};
# Propagate augeas errors
- die($@) if($@);
+ $self->_augeas_error($@) if ($@);
return $augeas;
}
@@ -355,19 +408,28 @@ sub get_default_kernel
eval {
$default = $g->aug_get('/files/boot/grub/menu.lst/default');
};
+ # Doesn't matter if get fails
# Get the grub filesystem
my $grub = $self->{desc}->{boot}->{grub_fs};
# Look for a kernel, starting with the default
my @paths;
- push(@paths, $g->aug_match("/files/boot/grub/menu.lst/".
- "title[$default]/kernel")) if defined($default);
- push(@paths, $g->aug_match('/files/boot/grub/menu.lst/title/kernel'));
+ eval {
+ push(@paths, $g->aug_match("/files/boot/grub/menu.lst/".
+ "title[$default]/kernel"))
+ if defined($default);
+ push(@paths, $g->aug_match('/files/boot/grub/menu.lst/title/kernel'));
+ };
+
+ $self->_augeas_error($@) if ($@);
my $kernel;
foreach my $path (@paths) {
- $kernel = $g->aug_get($path);
+ eval {
+ $kernel = $g->aug_get($path);
+ };
+ $self->_augeas_error($@) if ($@);
# Prepend the grub filesystem to the kernel path
$kernel = "$grub$kernel" if(defined($grub));
@@ -521,7 +583,11 @@ sub add_kernel
$self->_install_rpms(0, ($app));
# Make augeas reload so it'll find the new kernel
- $g->aug_load();
+ eval {
+ $g->aug_load();
+ };
+
+ $self->_augeas_error($@) if ($@);
return $version;
}
@@ -603,17 +669,15 @@ sub remove_kernel
unless(defined($version));
my $g = $self->{g};
- eval {
- # Work out which rpm contains the kernel
- my @output =
- $g->command_lines(['rpm', '-qf', "/boot/vmlinuz-$version"]);
- $g->command(['rpm', '-e', $output[0]]);
- };
-
- die($@) if($@);
+ # Work out which rpm contains the kernel
+ my @output = $g->command_lines(['rpm', '-qf', "/boot/vmlinuz-$version"]);
+ $g->command(['rpm', '-e', $output[0]]);
# Make augeas reload so it knows the kernel's gone
- $g->aug_load();
+ eval {
+ $g->aug_load();
+ };
+ $self->_augeas_error($@) if ($@);
}
=item add_application(label)
@@ -928,13 +992,14 @@ sub remove_application
my $name = shift;
my $g = $self->{g};
+ $g->command(['rpm', '-e', $name]);
+
+ # Make augeas reload in case the removal changed anything
eval {
- $g->command(['rpm', '-e', $name]);
+ $g->aug_load();
};
- die($@) if($@);
- # Make augeas reload in case the removal changed anything
- $g->aug_load();
+ $self->_augeas_error($@) if ($@);
}
=item get_application_owner(file)
@@ -969,15 +1034,14 @@ sub _install_rpms
@rpms = map { $_ = $self->_transfer_path($_) } @rpms;
my $g = $self->{g};
+ $g->command(['rpm', $upgrade == 1 ? '-U' : '-i', @rpms]);
+
+ # Reload augeas in case the rpm installation changed anything
eval {
- $g->command(['rpm', $upgrade == 1 ? '-U' : '-i', @rpms]);
+ $g->aug_load();
};
- # Propagate command failure
- die($@) if($@);
-
- # Reload augeas in case the rpm installation changed anything
- $g->aug_load();
+ $self->_augeas_error($@) if($@);
}
# Get full, local path of a file on the transfer mount
@@ -1049,13 +1113,17 @@ sub remap_block_devices
if ($libata) {
# Look for IDE and SCSI devices in fstab for the guest
my %guestif;
- foreach my $spec ($g->aug_match('/files/etc/fstab/*/spec')) {
- my $device = $g->aug_get($spec);
+ eval {
+ foreach my $spec ($g->aug_match('/files/etc/fstab/*/spec')) {
+ my $device = $g->aug_get($spec);
- next unless($device =~ m{^/dev/(sd|hd)([a-z]+)});
- $guestif{$1} ||= {};
- $guestif{$1}->{$1.$2} = 1;
- }
+ next unless($device =~ m{^/dev/(sd|hd)([a-z]+)});
+ $guestif{$1} ||= {};
+ $guestif{$1}->{$1.$2} = 1;
+ }
+ };
+
+ $self->_augeas_error($@) if ($@);
# If fstab contains references to sdX, these could refer to IDE or SCSI
# devices. We may need to update them.
@@ -1115,19 +1183,23 @@ sub remap_block_devices
$letter++;
}
- # Go through fstab again, updating bare device references
- foreach my $spec ($g->aug_match('/files/etc/fstab/*/spec')) {
- my $device = $g->aug_get($spec);
+ eval {
+ # Go through fstab again, updating bare device references
+ foreach my $spec ($g->aug_match('/files/etc/fstab/*/spec')) {
+ my $device = $g->aug_get($spec);
- next unless($device =~ m{^/dev/([a-z]+)(\d*)});
- my $name = $1;
- my $part = $2;
+ next unless($device =~ m{^/dev/([a-z]+)(\d*)});
+ my $name = $1;
+ my $part = $2;
- next unless(exists($map{$name}));
+ next unless(exists($map{$name}));
- $g->aug_set($spec, "/dev/".$map{$name}.$part);
- }
- $g->aug_save();
+ $g->aug_set($spec, "/dev/".$map{$name}.$part);
+ }
+ $g->aug_save();
+ };
+
+ $self->_augeas_error($@) if ($@);
# Delete cached (and now out of date) blkid info if it exists
foreach my $blkidtab ('/etc/blkid/blkid.tab', '/etc/blkid.tab') {
@@ -1292,21 +1364,11 @@ sub prepare_bootable
}
}
- eval {
- $g->aug_save();
- };
-
- if ($@) {
- my $msg = '';
- foreach my $error ($g->aug_match('/augeas//error')) {
- $msg .= $error.': '.$g->aug_get($error)."\n";
- }
- die($msg);
- }
+ $g->aug_save();
};
# Propagate augeas failure
- die($@) if($@);
+ $self->_augeas_error($@) if ($@);
if(!defined($initrd)) {
print STDERR user_message(__x("WARNING: Kernel version {version} ".
@@ -1330,12 +1392,7 @@ sub prepare_bootable
$g->aug_save();
};
- if($@) {
- foreach my $error ($g->aug_match('/augeas//error/*')) {
- print STDERR "$error: ".$g->aug_get($error)."\n";
- }
- die($@);
- }
+ $self->_augeas_error($@) if ($@);
# We explicitly modprobe ext2 here. This is required by mkinitrd on RHEL
# 3, and shouldn't hurt on other OSs. We don't care if this fails.
--
1.6.6.1
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