setup-gummiboot-conf: add new scriptsubmit/tizen/20130626.093738

This script updates gummiboot configuration files. Can be used when a new
kernel was installed or a kernel was uninstalled.

Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

1 files changed, 91 insertions, 0 deletions

diff --git a/setup-gummiboot-conf b/setup-gummiboot-conf
new file mode 100755
index 0000000..81dda83
--- /dev/null
+++ b/setup-gummiboot-conf
@@ -0,0 +1,91 @@
+#!/bin/sh -efu
+
+# Copyright 2013 Intel Corporation
+# Author: Artem Bityutskiy
+# License: GPLv2
+
+# This script assumes there is a working gummiboot configuration exists. This
+# scripts then scanse the boot partition, finds out which kernels are
+# available, and updates the gummiboot kernel entries: adds missing kernel
+# entries and delets non-existing kernel entries. The default entry is always
+# set to the latest kernel.
+#
+# We make several assumptions in this script.
+# 1. The kernel binary names are 'vmlinuz-<version>'
+# 2. Kernel entry file names are 'vmlinuz-<version>.conf'
+# 3. There is always the "default" keyword in loader.conf, and we use the
+#    corresponding kernel entry for adding new kernels.
+# 4. The 'default' entry in loader.conf does not does not use the wildcard ("*")
+# 5. Kernels binaries are placed in the ESP root
+#
+# May be there are few more implicit assumption. This all can be improved and
+# made to be more flexible if needed.
+
+PROG="setup-gummiboot-conf"
+
+# This is a helper function which printfs an error message and exits
+fatal()
+{
+	printf "%s\n" "$PROG: error: $1\n" 1>&2
+	exit 1
+}
+
+# Right now we assume that ESP is always in "/boot", but later we can add a
+# command line option for this.
+esp="/home/dedekind/tmp/boot"
+conf_file="$esp/loader/loader.conf"
+entries_dir="$esp/loader/entries"
+
+# Make sure the gummiboot configuration file exists
+[ -f "$conf_file" ] || \
+	fatal "cannot find the gummiboot configuration file (\"$conf_file\")"
+
+# Get the list of installed kernels
+kernels="$(ls -1 "$esp" | grep '^vmlinuz-' | sort -r)"
+[ -n "$kernels" ] || \
+	fatal "no vmlinuz-* files found in \"$esp\""
+
+# Get the list of gummiboot kernel entries
+entries="$(ls -1 "$entries_dir" | sed -e 's/\.conf$//g' | sort -r)"
+[ -n "$entries" ] || \
+	fatal "no gummiboot entries found in \"$entries_dir\""
+
+# Get the default entry name
+default_entry="$(cat "$conf_file" | sed -n -e 's/[ \t]*default[ \t]\+\(.\+\)[ \t]*/\1/p')"
+[ -n "$default_entry" ] || \
+	fatal "cannot find the default entry in \"$conf_file\""
+[ "$(printf "%s\n" "$default_entry" | wc -l)" -eq "1" ] || \
+	fatal "more than one default entry in \"$conf_file\""
+[ -f "$entries_dir/$default_entry" ] || \
+	fatal "the default gummiboot entry file does not exist: \"$entries_dir/$default_entry\""
+
+# Use the default entry to prepare the pattern for other entries
+pattern="$(cat "$entries_dir/$default_entry")"
+# Drop few keywords which we won't need
+pattern="$(printf "%s" "$pattern" | sed -e '/[ \t]*linux[ \t]\+/d')"
+pattern="$(printf "%s" "$pattern" | sed -e '/[ \t]*efi[ \t]\+/d')"
+pattern="$(printf "%s" "$pattern" | sed -e '/[ \t]*version[ \t]\+/d')"
+
+# Create an entry for every new kernel
+printf "%s\n" "$kernels" | while IFS= read -r kernel; do
+
+	if [ -f "$entries_dir/$kernel.conf" ]; then
+		continue
+	fi
+
+	kernel_version="$(printf "%s" $kernel | sed -e 's/vmlinuz-\(.*\)/\1/')"
+
+	printf "%s" "$pattern" > "$entries_dir/$kernel.conf"
+	printf "\n%s" "version $kernel_version" >> "$entries_dir/$kernel.conf"
+	printf "\n%s" "efi /$kernel" >> "$entries_dir/$kernel.conf"
+done
+
+# Update the default entry
+newest_kernel="$(printf "%s" "$kernels" | head -n1)"
+sed -i -e "s/[ \t]*default[ \t]\+.*/default $newest_kernel.conf/" "$conf_file"
+
+# Remove gummiboot entries for non-existing kernels
+printf "%s\n" "$entries" | while IFS= read -r entry; do
+	kernel="$entry"
+	[ -f "$esp/$kernel" ] || rm "$entries_dir/$entry.conf"
+done