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[Qemu-devel] [PATCH v4 8/10] qemu-binfmt-conf.sh: add option --clear
From: |
Unai Martinez-Corral |
Subject: |
[Qemu-devel] [PATCH v4 8/10] qemu-binfmt-conf.sh: add option --clear |
Date: |
Mon, 11 Mar 2019 10:31:06 +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. 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 | 41 ++++++++++++++++++++++++++++++++++---
1 file changed, 38 insertions(+), 3 deletions(-)
diff --git a/scripts/qemu-binfmt-conf.sh b/scripts/qemu-binfmt-conf.sh
index fde78517ff..07d1ee1f04 100755
--- a/scripts/qemu-binfmt-conf.sh
+++ b/scripts/qemu-binfmt-conf.sh
@@ -196,7 +196,7 @@ 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)
@@ -206,9 +206,10 @@ TARGETS QEMU_TARGETS A single arch name
or a list of them (see
systemd-binfmt.service; environment
variable HOST_ARCH
allows to override 'uname' to generate
configuration files
for a different architecture than the
current one.
-
-e|--exportdir PATH: DEBIANDIR define where to write configuration files
SYSTEMDDIR
+-c|--clear: QEMU_CLEAR (yes) remove registered interpreters for
target TARGETS;
+ then exit.
-c|--credential: QEMU_CREDENTIAL (yes) credential and security tokens are
calculated according
to the binary to interpret
-p|--persistent: QEMU_PERSISTENT (yes) load the interpreter and keep it
in memory; all future
@@ -336,6 +337,25 @@ 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() {
+ names='qemu-*'
+ if [ $# -ne 0 ] ; 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 $names -exec sh -c 'printf %s
-1 > {}' \;
+}
+
CHECK=qemu_check_bintfmt_misc
BINFMT_SET=qemu_register_interpreter
@@ -347,12 +367,16 @@ QEMU_PATH="${QEMU_PATH:-/usr/local/bin}"
QEMU_SUFFIX="${QEMU_SUFFIX:-}"
QEMU_CREDENTIAL="${QEMU_CREDENTIAL:-no}"
QEMU_PERSISTENT="${QEMU_PERSISTENT:-no}"
+QEMU_CLEAR="${QEMU_CLEAR:-no}"
-options=$(getopt -o dsQ:S:e:hcp -l
debian,systemd,path:,suffix:,exportdir:,help,credential,persistent -- "$@")
+options=$(getopt -o cdsQ:S:e:hcp -l
clear,debian,systemd,path:,suffix:,exportdir:,help,credential,persistent --
"$@")
eval set -- "$options"
while true ; do
case "$1" in
+ -c|--clear)
+ QEMU_CLEAR="yes"
+ ;;
-d|--debian)
CHECK=qemu_check_debian
BINFMT_SET=qemu_generate_debian
@@ -395,4 +419,15 @@ done
shift
$CHECK
+
+if [ "x$QEMU_CLEAR" = "xyes" ] ; then
+ case "$BINFMT_SET" in
+ *debian) BINFMT_CLEAR=qemu_clear_notimplemented ;;
+ *systemd) BINFMT_CLEAR=qemu_clear_notimplemented ;;
+ *) BINFMT_CLEAR=qemu_clear_interpreter
+ esac
+ $BINFMT_CLEAR "$@"
+ exit
+fi
+
qemu_set_binfmts "$@"
--
2.21.0
- [Qemu-devel] [PATCH v4 1/10] qemu-binfmt-conf.sh: enforce safe style consistency, (continued)
[Qemu-devel] [PATCH v4 8/10] qemu-binfmt-conf.sh: add option --clear,
Unai Martinez-Corral <=
[Qemu-devel] [PATCH v4 9/10] qemu-binfmt-conf.sh: update usage(), Unai Martinez-Corral, 2019/03/11
[Qemu-devel] [PATCH v4 10/10] qemu-binfmt-conf.sh: add --test|--dry-run, Unai Martinez-Corral, 2019/03/11
Re: [Qemu-devel] [PATCH v4 0/10] qemu-binfmt-conf.sh, no-reply, 2019/03/11
Re: [Qemu-devel] [PATCH v4 0/10] qemu-binfmt-conf.sh, no-reply, 2019/03/11