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author | Andrew Gaffney <agaffney@gentoo.org> | 2008-12-14 19:51:01 -0600 |
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committer | Andrew Gaffney <agaffney@gentoo.org> | 2008-12-14 19:51:01 -0600 |
commit | a86ba695a91b38da5b952434ac5db2d4dd15625f (patch) | |
tree | 74ccf604aab9f97b7c2f81f0541ccb6ba8ce0d30 /gen_bootloader.sh | |
parent | Initial commit for re-adding support for --bootloader=grub (diff) | |
download | genkernel-a86ba695a91b38da5b952434ac5db2d4dd15625f.tar.gz genkernel-a86ba695a91b38da5b952434ac5db2d4dd15625f.tar.bz2 genkernel-a86ba695a91b38da5b952434ac5db2d4dd15625f.zip |
Adding code that duplicates default grub.conf entry to replace old awk script. Based on code written by Mike Auty <ikelos@gentoo.org>
Diffstat (limited to 'gen_bootloader.sh')
-rw-r--r-- | gen_bootloader.sh | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/gen_bootloader.sh b/gen_bootloader.sh index d39b6bd5..5f0bb51c 100644 --- a/gen_bootloader.sh +++ b/gen_bootloader.sh @@ -79,6 +79,54 @@ set_bootloader_grub() { else # The grub.conf already exists, so let's try to duplicate the default entry + set_bootloader_grub_duplicate_default "${GRUB_CONF}" fi } + +set_bootloader_grub_duplicate_default_replace_kernel_initrd() { + sed -r -e "/^[[:space:]]*kernel/s/kernel-[[:alnum:][:punct:]]+/kernel-${KNAME}-${ARCH}-${KV}/" - | + sed -r -e "/^[[:space:]]*initrd/s/init(rd|ramfs)-[[:alnum:][:punct:]]+/init\1-${KNAME}-${ARCH}-${KV}/" +} + +set_bootloader_grub_duplicate_default() { + local GRUB_CONF=$1 + local GRUB_CONF_TMP="${GRUB_CONF}.tmp" + + line_count=$(wc -l < "${GRUB_CONF}") + line_nums="$(grep -n "^title" "${GRUB_CONF}" | cut -d: -f1)" + if [ -z "${line_nums}" ]; then + print_error 1 "No current 'title' entries found in your grub.conf...skipping update" + return 0 + fi + line_nums="${line_nums} $((${line_count}+1))" + + # Find default entry + default=$(sed -rn '/^[[:space:]]*default[[:space:]=]/s/^.*default[[:space:]=]+([[:alnum:]]+).*$/\1/p' "${GRUB_CONF}") + if ! echo ${default} | grep -q '^[0-9]\+$'; then + print_error 1 "We don't support non-numeric (such as 'saved') default values...skipping update" + return 0 + fi + + # Grub defaults are 0 based, cut is 1 based + # Figure out where the default entry lives + startstop=$(echo ${line_nums} | cut -d" " -f$((${default}+1))-$((${default}+2))) + startline=$(echo ${startstop} | cut -d" " -f1) + stopline=$(echo ${startstop} | cut -d" " -f2) + + # Write out the bits before the default entry + sed -n 1,$((${startline}-1))p "${GRUB_CONF}" > "${GRUB_CONF_TMP}" + + # Put in our title + echo "title=Gentoo Linux (${KV})" >> "${GRUB_CONF_TMP}" + + # Pass the default entry (minus the title) through to the replacement function and pipe the output to GRUB_CONF_TMP + sed -n $((${startline}+1)),$((${stopline}-1))p "${GRUB_CONF}" | set_bootloader_grub_duplicate_default_replace_kernel_initrd >> "${GRUB_CONF_TMP}" + + # Finish off with everything including the previous default entry + sed -n ${startline},${line_count}p "${GRUB_CONF}" >> "${GRUB_CONF_TMP}" + + cp "${GRUB_CONF}" "${GRUB_CONF}.bak" + cp "${GRUB_CONF_TMP}" "${GRUB_CONF}" + rm "${GRUB_CONF_TMP}" +} |