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Description of problem: In RHEL 5, grubby --default-kernel could be used from the anaconda environment to print out the default kernel from grub.conf (for instance in a kickstart), and then use that as the basis for further configuration. In RHEL 6, this is no longer possible.
# grubby --default-kernel
#
It appears this is a result of the change to suitableImage, where in RHEL 5 it would:
dev = nashGetPathBySpec(_nash_context, dev);
if (!dev)
return 0;
i = stat(dev, &sb);
if (i)
return 0;
stat("/", &sb2);
if (sb.st_rdev != sb2.st_dev)
return 0;
return 1;
So it basically only cared that the device existed and it could stat it, and if so we moved on. However in RHEL 6 it now tries to obtain the UUID of the block device:
dev = getpathbyspec(dev);
if (!dev)
return 0;
rootdev = findDiskForRoot();
if (!rootdev)
return 0;
if (!getuuidbydev(rootdev) || !getuuidbydev(dev)) {
free(rootdev);
return 0;
}
if (strcmp(getuuidbydev(rootdev), getuuidbydev(dev))) {
free(rootdev);
return 0;
}
free(rootdev);
return 1;
And cannot because it is /dev/root, so it bails out on the 3rd conditional above and which causes it to return without printing anything:
if (!suitableImage(entry, bootPrefix, 0, flags)) return 0;
This is breaking my customer's kickstarts and causing them to have to find another way to determine what the default kernel is in grub.
Version-Release number of selected component (if applicable): grubby-7.0.15-2.el6.x86_64
How reproducible: Always (in anaconda)
Steps to Reproduce:
1. Install system
2. Before rebooting, obtain a shell
3. Type
# grubby --default-kernel
Actual results: Nothing printed
Expected results: It prints the configured default kernel
Additional info: gdb analysis showed where it is bailing out.
Description of problem: In RHEL 5, grubby --default-kernel could be used from the anaconda environment to print out the default kernel from grub.conf (for instance in a kickstart), and then use that as the basis for further configuration. In RHEL 6, this is no longer possible. # grubby --default-kernel # It appears this is a result of the change to suitableImage, where in RHEL 5 it would: dev = nashGetPathBySpec(_nash_context, dev); if (!dev) return 0; i = stat(dev, &sb); if (i) return 0; stat("/", &sb2); if (sb.st_rdev != sb2.st_dev) return 0; return 1; So it basically only cared that the device existed and it could stat it, and if so we moved on. However in RHEL 6 it now tries to obtain the UUID of the block device: dev = getpathbyspec(dev); if (!dev) return 0; rootdev = findDiskForRoot(); if (!rootdev) return 0; if (!getuuidbydev(rootdev) || !getuuidbydev(dev)) { free(rootdev); return 0; } if (strcmp(getuuidbydev(rootdev), getuuidbydev(dev))) { free(rootdev); return 0; } free(rootdev); return 1; And cannot because it is /dev/root, so it bails out on the 3rd conditional above and which causes it to return without printing anything: if (!suitableImage(entry, bootPrefix, 0, flags)) return 0; This is breaking my customer's kickstarts and causing them to have to find another way to determine what the default kernel is in grub. Version-Release number of selected component (if applicable): grubby-7.0.15-2.el6.x86_64 How reproducible: Always (in anaconda) Steps to Reproduce: 1. Install system 2. Before rebooting, obtain a shell 3. Type # grubby --default-kernel Actual results: Nothing printed Expected results: It prints the configured default kernel Additional info: gdb analysis showed where it is bailing out.