I quite often see requests for an equivalent for the 'howmany' option
implemented in the update-grub script in Debian's GRUB Legacy packaging:
emit only so many native kernels, so that you could say howmany=2 to
avoid cluttering the menu with entries for more than two kernels even if
you haven't got round to removing the older ones yet. I don't know if
I'd use this myself but it seems like a pretty reasonable request.
Here's a patch to implement it, in what seemed fairly close to GRUB 2
style.
2010-07-13 Colin Watson <cjwat...@ubuntu.com>
* util/grub-mkconfig.in: Export GRUB_COUNT_HURD,
GRUB_COUNT_KFREEBSD, GRUB_COUNT_LINUX, GRUB_COUNT_NETBSD, and
GRUB_COUNT_XEN.
* util/grub.d/10_hurd.in: If GRUB_COUNT_HURD is set, only process
that many kernels.
* util/grub.d/10_kfreebsd.in: If GRUB_COUNT_KFREEBSD is set, only
process that many kernels.
* util/grub.d/10_linux.in: If GRUB_COUNT_LINUX is set, only process
that many kernels.
* util/grub.d/10_netbsd.in: If GRUB_COUNT_NETBSD is set, only
process that many kernels.
* util/grub.d/20_linux_xen.in: If GRUB_COUNT_XEN and/or
GRUB_COUNT_LINUX are set, only process that many hypervisors and
kernels respectively.
* docs/grub.texi (Simple configuration): Document GRUB_COUNT_HURD,
GRUB_COUNT_KFREEBSD, GRUB_COUNT_LINUX, GRUB_COUNT_NETBSD, and
GRUB_COUNT_XEN.
=== modified file 'docs/grub.texi'
--- docs/grub.texi 2010-07-05 10:08:04 +0000
+++ docs/grub.texi 2010-07-13 00:51:11 +0000
@@ -1064,6 +1064,24 @@ only to the default menu entry, after th
As @samp{GRUB_CMDLINE_LINUX} and @samp{GRUB_CMDLINE_LINUX_DEFAULT}, but for
NetBSD.
+...@item GRUB_COUNT_HURD
+The number of Hurd kernels for which @command{grub-mkconfig} should generate
+menu entries. Unset by default, meaning to generate menu entries for all
+kernels. (This excludes menu entries generated by @command{os-prober} for
+other operating systems installed on the same system.)
+
+...@item GRUB_COUNT_KFREEBSD
+As @samp{GRUB_COUNT_HURD}, but for FreeBSD kernels.
+
+...@item GRUB_COUNT_LINUX
+As @samp{GRUB_COUNT_LINUX}, but for Linux kernels.
+
+...@item GRUB_COUNT_NETBSD
+As @samp{GRUB_COUNT_HURD}, but for NetBSD kernels.
+
+...@item GRUB_COUNT_XEN
+As @samp{GRUB_COUNT_HURD}, but for Xen hypervisors.
+
@item GRUB_DISABLE_LINUX_UUID
Normally, @command{grub-mkconfig} will generate menu entries that use
universally-unique identifiers (UUIDs) to identify the root filesystem to
=== modified file 'util/grub-mkconfig.in'
--- util/grub-mkconfig.in 2010-06-29 15:20:49 +0000
+++ util/grub-mkconfig.in 2010-07-13 00:39:38 +0000
@@ -262,6 +262,11 @@ export GRUB_DEFAULT \
GRUB_CMDLINE_XEN_DEFAULT \
GRUB_CMDLINE_NETBSD \
GRUB_CMDLINE_NETBSD_DEFAULT \
+ GRUB_COUNT_HURD \
+ GRUB_COUNT_KFREEBSD \
+ GRUB_COUNT_LINUX \
+ GRUB_COUNT_NETBSD \
+ GRUB_COUNT_XEN \
GRUB_TERMINAL_INPUT \
GRUB_TERMINAL_OUTPUT \
GRUB_SERIAL_COMMAND \
=== modified file 'util/grub.d/10_hurd.in'
--- util/grub.d/10_hurd.in 2010-06-29 15:20:49 +0000
+++ util/grub.d/10_hurd.in 2010-07-13 00:45:55 +0000
@@ -36,7 +36,14 @@ all_of_them=true
# FIXME: add l4 here?
kernel=
+count=0
for i in /boot/gnumach* ; do
+ if test "x${GRUB_COUNT_HURD}" != "x" && \
+ test "${count}" -ge "${GRUB_COUNT_HURD}"; then
+ break
+ fi
+ count="$((${count} + 1))"
+
if test -e $i ; then
basename=`basename $i`
dirname=`dirname $i`
=== modified file 'util/grub.d/10_kfreebsd.in'
--- util/grub.d/10_kfreebsd.in 2010-06-29 15:20:49 +0000
+++ util/grub.d/10_kfreebsd.in 2010-07-13 00:43:14 +0000
@@ -80,8 +80,15 @@ list=`for i in /boot/kfreebsd-* /boot/ke
if grub_file_is_not_garbage "$i" ; then echo -n "$i " ; fi
done`
prepare_boot_cache=
+count=0
while [ "x$list" != "x" ] ; do
+ if test "x${GRUB_COUNT_KFREEBSD}" != "x" && \
+ test "${count}" -ge "${GRUB_COUNT_KFREEBSD}"; then
+ break
+ fi
+ count="$((${count} + 1))"
+
kfreebsd=`version_find_latest $list`
echo "Found kernel of FreeBSD: $kfreebsd" >&2
basename=`basename $kfreebsd`
=== modified file 'util/grub.d/10_linux.in'
--- util/grub.d/10_linux.in 2010-07-02 11:32:05 +0000
+++ util/grub.d/10_linux.in 2010-07-13 00:43:37 +0000
@@ -106,8 +106,15 @@ list=`for i in /boot/vmlinu[zx]-* /vmlin
if grub_file_is_not_garbage "$i" ; then echo -n "$i " ; fi
done`
prepare_boot_cache=
+count=0
while [ "x$list" != "x" ] ; do
+ if test "x${GRUB_COUNT_LINUX}" != "x" && \
+ test "${count}" -ge "${GRUB_COUNT_LINUX}"; then
+ break
+ fi
+ count="$((${count} + 1))"
+
linux=`version_find_latest $list`
echo "Found linux image: $linux" >&2
basename=`basename $linux`
=== modified file 'util/grub.d/10_netbsd.in'
--- util/grub.d/10_netbsd.in 2010-06-29 15:20:49 +0000
+++ util/grub.d/10_netbsd.in 2010-07-13 00:44:07 +0000
@@ -63,6 +63,7 @@ netbsd_entry ()
}
prepare_boot_cache="$(prepare_grub_to_access_device ${GRUB_DEVICE} | sed -e
's,^, ,')"
+count=0
# We look for NetBSD kernels in / but not in subdirectories. We simply
# pick all statically linked ELF executable files (or links) in / with a
@@ -77,6 +78,12 @@ for k in $(ls -t /netbsd*) ; do
continue
fi
+ if test "x${GRUB_COUNT_NETBSD}" != "x" && \
+ test "${count}" -ge "${GRUB_COUNT_NETBSD}"; then
+ break
+ fi
+ count="$((${count} + 1))"
+
echo "Found NetBSD kernel: $k" >&2
netbsd_entry "knetbsd" "$k" false "${GRUB_CMDLINE_NETBSD_DEFAULT}"
netbsd_entry "multiboot" "$k" false "${GRUB_CMDLINE_NETBSD_DEFAULT}"
=== modified file 'util/grub.d/20_linux_xen.in'
--- util/grub.d/20_linux_xen.in 2010-06-29 15:20:49 +0000
+++ util/grub.d/20_linux_xen.in 2010-07-13 00:45:55 +0000
@@ -95,15 +95,29 @@ xen_list=`for i in /boot/xen*; do
if grub_file_is_not_garbage "$i" ; then echo -n "$i " ; fi
done`
prepare_boot_cache=
+xen_count=0
while [ "x${xen_list}" != "x" ] ; do
+ if test "x${GRUB_COUNT_XEN}" != "x" && \
+ test "${xen_count}" -ge "${GRUB_COUNT_XEN}"; then
+ break
+ fi
+ xen_count="$((${xen_count} + 1))"
+
list="${linux_list}"
current_xen=`version_find_latest $xen_list`
xen_basename=`basename ${current_xen}`
xen_dirname=`dirname ${current_xen}`
rel_xen_dirname=`make_system_path_relative_to_its_root $xen_dirname`
xen_version=`echo $xen_basename | sed -e "s,.gz$,,g;s,^xen-,,g"`
+ linux_count=0
while [ "x$list" != "x" ] ; do
+ if test "x${GRUB_COUNT_LINUX}" != "x" && \
+ test "${linux_count}" -ge "${GRUB_COUNT_LINUX}"; then
+ break
+ fi
+ linux_count="$((${linux_count} + 1))"
+
linux=`version_find_latest $list`
echo "Found linux image: $linux" >&2
basename=`basename $linux`
--
Colin Watson [cjwat...@ubuntu.com]
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