This is a partial implementation.
Allows to remove a single or a list of already registered binfmt
interpreters. Valid values are those in qemu_target_list.
If TARGETS is empty, all the existing 'qemu-*' interpreters are
removed.
This is partial because 'debian' and 'systemd' configurations are not
supported. The script will exit with error 'option clear 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, 34 insertions(+), 2 deletions(-)
diff --git a/scripts/qemu-binfmt-conf.sh b/scripts/qemu-binfmt-conf.sh
index 5d6535bfc9..16c48e13a8 100755
--- a/scripts/qemu-binfmt-conf.sh
+++ b/scripts/qemu-binfmt-conf.sh
@@ -197,7 +197,7 @@ Options and associated environment variables:
Argument Env-variable Description
TARGETS QEMU_TARGETS A single arch name or a list of them
(see all names below);
- if empty, configure all known targets;
+ if empty, configure/clear all known
targets;
if 'NONE', no interpreter is
configured.
-h|--help display this usage
-Q|--path PATH QEMU_PATH set path to qemu interpreter(s)
@@ -206,6 +206,8 @@ TARGETS QEMU_TARGETS A single arch name or
a list of them (see
uses are cloned from the open file.
-c|--credential QEMU_CREDENTIAL (yes) credential and security tokens
are calculated according
to the binary to interpret
+-r|--clear QEMU_CLEAR (yes) remove registered interpreters for
target TARGETS;
+ then exit.
-e|--exportdir PATH define where to write configuration
files
(default: $SYSTEMDDIR or $DEBIANDIR)
-s|--systemd don't write into /proc, generate
file(s) for
@@ -218,6 +220,7 @@ QEMU_PATH=$QEMU_PATH
QEMU_SUFFIX=$QEMU_SUFFIX
QEMU_PERSISTENT=$QEMU_PERSISTENT
QEMU_CREDENTIAL=$QEMU_CREDENTIAL
+QEMU_CLEAR=$QEMU_CLEAR
To import templates with update-binfmts, use :
@@ -344,8 +347,22 @@ qemu_set_binfmts() {
done
}
+qemu_clear_notimplemented() {
+ echo "ERROR: option clear not implemented for this mode yet" 1>&2
+ usage
+ exit 1
+}
+
+qemu_clear_interpreter() {
+ p="/proc/sys/fs/binfmt_misc/$1"
+ if [ -f "$p" ] ; then
+ printf %s -1 > "$p"
+ fi
+}
+
CHECK=qemu_check_bintfmt_misc
BINFMT_SET=qemu_register_interpreter
+BINFMT_CLEAR=qemu_clear_interpreter
SYSTEMDDIR="/etc/binfmt.d"
DEBIANDIR="/usr/share/binfmts"
@@ -355,20 +372,26 @@ QEMU_PATH="${QEMU_PATH:-/usr/local/bin}"
QEMU_SUFFIX="${QEMU_SUFFIX:-}"
QEMU_PERSISTENT="${QEMU_PERSISTENT:-no}"
QEMU_CREDENTIAL="${QEMU_CREDENTIAL:-no}"
+QEMU_CLEAR="${QEMU_CLEAR:-no}"
-options=$(getopt -o dsQ:S:e:hcp -l
debian,systemd,path:,suffix:,exportdir:,help,credential,persistent -- "$@")
+options=$(getopt -o rdsQ:S:e:hcp -l
clear,debian,systemd,path:,suffix:,exportdir:,help,credential,persistent --
"$@")
eval set -- "$options"
while true ; do
case "$1" in
+ -r|--clear)
+ QEMU_CLEAR="yes"
+ ;;
-d|--debian)
CHECK=qemu_check_debian
BINFMT_SET=qemu_generate_debian
+ BINFMT_CLEAR=qemu_clear_notimplemented
EXPORTDIR=${EXPORTDIR:-$DEBIANDIR}
;;
-s|--systemd)
CHECK=qemu_check_systemd
BINFMT_SET=qemu_generate_systemd
+ BINFMT_CLEAR=qemu_clear_notimplemented
EXPORTDIR=${EXPORTDIR:-$SYSTEMDDIR}
;;
-Q|--path)
@@ -403,4 +426,13 @@ done
shift
$CHECK
+
+if [ "x$QEMU_CLEAR" = "xyes" ] ; then
+ qemu_check_target_list "$@"
+ for t in $checked_target_list ; do
+ $BINFMT_CLEAR "qemu-$t"
+ done
+ exit
+fi
+
qemu_set_binfmts "$@"
--
2.21.0