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[Qemu-devel] [PATCH v3 7/10] qemu-binfmt-conf.sh: add option --reset <AR
From: |
Unai Martinez-Corral |
Subject: |
[Qemu-devel] [PATCH v3 7/10] qemu-binfmt-conf.sh: add option --reset <ARCHS> |
Date: |
Wed, 6 Mar 2019 04:52:52 +0000 |
User-agent: |
Mutt/1.11.2 (2019-01-07) |
This is a partial implementation.
Allows to remove a single or a list of already registered binfmt
interpreters. If <ARCHS> is a list, it must be comma-separated.
Valid values are those in qemu_target_list. If <ARCHS> is 'ALL', all
the existing 'qemu-*' interpreters are removed.
This is partial because 'debian' and 'systemd' configurations are not
removed. If option 'reset' is provided before any of those, reset is
executed first and the configuration proceeds. However, if 'reset' is
provided after any of them, the script will exit with error 'option
reset not implemented for this mode yet'.
Removal is done by printing '-1' as explained at:
https://www.kernel.org/doc/Documentation/admin-guide/binfmt-misc.rst
Signed-off-by: Unai Martinez-Corral <address@hidden>
---
scripts/qemu-binfmt-conf.sh | 36 +++++++++++++++++++++++++++++++++---
1 file changed, 33 insertions(+), 3 deletions(-)
diff --git a/scripts/qemu-binfmt-conf.sh b/scripts/qemu-binfmt-conf.sh
index 2751363089..824e3c4c34 100755
--- a/scripts/qemu-binfmt-conf.sh
+++ b/scripts/qemu-binfmt-conf.sh
@@ -197,8 +197,8 @@ qemu_get_family() {
usage() {
cat <<EOF
-Usage: qemu-binfmt-conf.sh [--path PATH][--debian][--systemd]
- [--help][--credential][--exportdir PATH]
+Usage: qemu-binfmt-conf.sh [--help][--path PATH][--debian][--systemd]
+ [--reset ARCHS][--credential][--exportdir PATH]
[--persistent][--suffix SUFFIX][CPUS]
Configure binfmt_misc to use qemu interpreter for the given CPUS.
@@ -219,6 +219,9 @@ Usage: qemu-binfmt-conf.sh [--path
PATH][--debian][--systemd]
architecture than the current one.
--exportdir: define where to write configuration files
(default: $SYSTEMDDIR or $DEBIANDIR)
+ --reset: remove registered interpreter for target ARCHS (comma
+ separated list). If ARCHS is 'ALL', remove all registered
+ 'qemu-*' interpreters.
--credential: if present, credential and security tokens are
calculated according to the binary to interpret
($QEMU_CREDENTIAL=yes)
@@ -353,8 +356,28 @@ qemu_set_binfmts() {
done
}
+qemu_remove_notimplemented() {
+ echo "ERROR: option reset not implemented for this mode yet" 1>&2
+ usage
+ exit 1
+}
+
+qemu_remove_interpreter() {
+ names='qemu-*'
+ if [ "x$1" != "xALL" ] ; then
+ qemu_check_target_list $1
+ unset names pre
+ for t in $checked_target_list ; do
+ names="${names}${pre}qemu-$t"
+ pre=' -o -name '
+ done
+ fi
+ find /proc/sys/fs/binfmt_misc/ -type f -name $names -exec sh -c 'printf %s
-1 > {}' \;
+}
+
CHECK=qemu_check_bintfmt_misc
BINFMT_SET=qemu_register_interpreter
+BINFMT_REMOVE=qemu_remove_interpreter
SYSTEMDDIR="/etc/binfmt.d"
DEBIANDIR="/usr/share/binfmts"
@@ -364,19 +387,26 @@ QEMU_SUFFIX="${QEMU_SUFFIX:-}"
QEMU_CREDENTIAL="${QEMU_CREDENTIAL:-no}"
QEMU_PERSISTENT="${QEMU_PERSISTENT:-no}"
-options=$(getopt -o :dsQ:S:e:hcp -l
debian,systemd,path:,suffix:,exportdir:,help,credential,persistent -- "$@")
+options=$(getopt -o r:dsQ:S:e:hcp -l
reset:,debian,systemd,path:,suffix:,exportdir:,help,credential,persistent --
"$@")
eval set -- "$options"
while true ; do
case "$1" in
+ -r|--reset)
+ shift
+ $CHECK
+ qemu_remove_interpreter $1
+ ;;
-d|--debian)
CHECK=qemu_check_debian
BINFMT_SET=qemu_generate_debian
+ BINFMT_REMOVE=qemu_remove_notimplemented
EXPORTDIR=${EXPORTDIR:-$DEBIANDIR}
;;
-s|--systemd)
CHECK=qemu_check_systemd
BINFMT_SET=qemu_generate_systemd
+ BINFMT_REMOVE=qemu_remove_notimplemented
EXPORTDIR=${EXPORTDIR:-$SYSTEMDDIR}
;;
-Q|--path)
--
2.20.1
- Re: [Qemu-devel] [PATCH v3 3/10] qemu-binfmt-conf.sh: add QEMU_CREDENTIAL and QEMU_PERSISTENT, (continued)
- [Qemu-devel] [PATCH v3 4/10] qemu-binfmt-conf.sh: remove 'qemu' prefix from cli options, Unai Martinez-Corral, 2019/03/05
- [Qemu-devel] [PATCH v3 5/10] qemu-binfmt-conf.sh: honour QEMU_PATH and/or QEMU_SUFFIX, Unai Martinez-Corral, 2019/03/05
- [Qemu-devel] [PATCH v3 6/10] qemu-binfmt-conf.sh: generalize <CPU> to positional <CPUS>, Unai Martinez-Corral, 2019/03/05
- [Qemu-devel] [PATCH v3 7/10] qemu-binfmt-conf.sh: add option --reset <ARCHS>,
Unai Martinez-Corral <=
- [Qemu-devel] [PATCH v3 8/10] qemu-binfmt-conf.sh: refactor usage(), Unai Martinez-Corral, 2019/03/05
- [Qemu-devel] [PATCH v3 9/10] qemu-binfmt-conf.sh: update usage(), Unai Martinez-Corral, 2019/03/05
- [Qemu-devel] [PATCH v3 10/10] qemu-binfmt-conf.sh: support QEMU_TARGETS, Unai Martinez-Corral, 2019/03/05
- Re: [Qemu-devel] [PATCH v3 0/10] qemu-binfmt-conf.sh, no-reply, 2019/03/05
- Re: [Qemu-devel] [PATCH v3 0/10] qemu-binfmt-conf.sh, no-reply, 2019/03/09