* maximilian attems <max@xxxxxxx> [20090623 00:25]: > On Sun, 21 Jun 2009, Michael Prokop wrote: > > Current kernel versions support different decompression options for > > kernel and initrd: > > CONFIG_DECOMPRESS_GZIP > > CONFIG_DECOMPRESS_BZIP2 > > CONFIG_DECOMPRESS_LZMA > i haven't played with those, but yes why not. > do you know what happens if initramfs is in lzma but kernel not? Looking at the kernel source AFAICS (providing the example for lzma): * CONFIG_KERNEL_LZMA (depends on CONFIG_HAVE_KERNEL_LZMA) is for the kernel related part at kernel build time (requires lzma userspace tools then) and relevant as well for decompressing a lzma compressed kernel during bootup. * CONFIG_INITRAMFS_COMPRESSION_LZMA (depends on CONFIG_DECOMPRESS_LZMA) is for generating the initramfs file at kernel build time with lzma compression. * CONFIG_DECOMPRESS_LZMA is for loading a lzma compressed (initramfs) file at bootup. So the kernel and initramfs parts should be independent from each other and IMHO it should be enough to check for accordingly set CONFIG_DECOMPRESS_LZMA support in /boot/config-... when generating a lzma compressed initramfs file via initramfs-tools. > > initramfs-tools currently supports gzip only. I'd like to see > > support for bzip2 and lzma as well, as both of them provide better > > compression (which is especially interesting for live systems). > > IMHO the user should get gzip by default (if unset) but be able to > > choose between gzip, bzip2 and lzma. Something like > > COMPRESSION=[gzip|bzip2|lzma] in /etc/initramfs-tools/initramfs.conf > > should provide that. > > I plan to provide the according code for integration (though I'm > > running out of time right now, so it might need a few days/weeks). > > Please ACK my idea if that's in your interest. If have any special > > configuration variable / implementation wishes please let me know. > adding the dracut guys on cc, afais they haven't implement it > yet too, so maybe we can easily agree: > ~/src/dracut$ egrep gzip dracut > ( cd "$initdir"; find . |cpio -H newc -o |gzip -9 > "$outfile"; ) Thanks, good idea. Any input/feedback welcome. regards, -mika-
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