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* [PATCH v8 7/9] qemu-binfmt-conf.sh: generalize <CPU> to positional [TARGETS]
@ 2020-03-07 17:41 Unai Martinez-Corral
  0 siblings, 0 replies; 2+ messages in thread
From: Unai Martinez-Corral @ 2020-03-07 17:41 UTC (permalink / raw)
  To: qemu-devel; +Cc: riku.voipio, laurent

This breaks brackward compatibility.

Option '--systemd CPU' allows to register binfmt interpreters for a
single target architecture or for 'ALL' (of them). This patch
generalizes the approach to support it in any mode (default, '--debian'
or '--systemd'). To do so, option 'systemd' is changed to be boolean
(no args). Then, all the positional arguments are considered to be a
list of target architectures.

If no positional arguments are provided, all of the architectures in
qemu_target_list are registered. Conversely, argument value 'NONE'
allows to make a 'dry run' of the script. I.e., checks are executed
according to the mode, but no interpreter is registered.

Support QEMU_TARGETS environment variable, consistently with 'path',
'suffix', 'persistent' and 'credential', The supported formats are
the same as for positional arguments, which have priority. If both
the variable and the list of positional arguments are empty, defaults
to qemu_target_list.

Signed-off-by: Unai Martinez-Corral <unai.martinezcorral@ehu.eus>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
---
 scripts/qemu-binfmt-conf.sh | 80 +++++++++++++++++++++----------------
 1 file changed, 46 insertions(+), 34 deletions(-)

diff --git a/scripts/qemu-binfmt-conf.sh b/scripts/qemu-binfmt-conf.sh
index 80ec164eab..d5d3484b58 100755
--- a/scripts/qemu-binfmt-conf.sh
+++ b/scripts/qemu-binfmt-conf.sh
@@ -6,6 +6,28 @@ ppc ppc64 ppc64le m68k mips mipsel mipsn32 mipsn32el mips64 mips64el \
 sh4 sh4eb s390x aarch64 aarch64_be hppa riscv32 riscv64 xtensa xtensaeb \
 microblaze microblazeel or1k x86_64"
 
+# check if given TARGETS is/are in the supported target list
+qemu_check_target_list() {
+    if [ $# -eq 0 ] ; then
+      checked_target_list="$qemu_target_list"
+      return
+    fi
+    unset checked_target_list
+    for target ; do
+        for cpu in $qemu_target_list ; do
+            if [ "x$cpu" = "x$target" ] ; then
+                checked_target_list="$checked_target_list $target"
+                break
+            fi
+        done
+        if [ "x$cpu" != "x$target" ] ; then
+            echo "ERROR: unknown CPU \"$target\"" 1>&2
+            usage
+            exit 1
+        fi
+    done
+}
+
 i386_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x03\x00'
 i386_mask='\xff\xff\xff\xff\xff\xfe\xfe\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
 i386_family=i386
@@ -171,14 +193,16 @@ qemu_get_family() {
 
 usage() {
     cat <<EOF
+Usage: qemu-binfmt-conf.sh [options] [TARGETS]
 
-Usage: qemu-binfmt-conf.sh [options]
-
-Configure binfmt_misc to use qemu interpreter
+Configure binfmt_misc to use qemu interpreter for the given TARGETS.
 
 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 'NONE', no interpreter is configured.
 -h|--help                             display this usage
 -Q|--path PATH       QEMU_PATH        set path to qemu interpreter(s)
 -F|--suffix SUFFIX   QEMU_SUFFIX      add a suffix to the default interpreter name
@@ -188,12 +212,12 @@ Argument             Env-variable     Description
                                       to the binary to interpret
 -e|--exportdir PATH                   define where to write configuration files
                                       (default: $SYSTEMDDIR or $DEBIANDIR)
--s|--systemd CPU                      don't write into /proc, generate file for
-                                      systemd-binfmt.service for the given CPU; if CPU is "ALL",
-                                      generate a file for all known cpus.
+-s|--systemd                          don't write into /proc, generate file(s) for
+                                      systemd-binfmt.service;
 -d|--debian                           don't write into /proc, generate update-binfmts templates
 
 Defaults:
+QEMU_TARGETS=$QEMU_TARGETS
 QEMU_PATH=$QEMU_PATH
 QEMU_SUFFIX=$QEMU_SUFFIX
 QEMU_PERSISTENT=$QEMU_PERSISTENT
@@ -207,14 +231,10 @@ To remove interpreter, use :
 
     sudo update-binfmts --package qemu-CPU --remove qemu-CPU $QEMU_PATH
 
-With systemd, binfmt files are loaded by systemd-binfmt.service
+The environment variable HOST_ARCH allows to override 'uname' to generate configuration files for
+a different architecture than the current one.
 
-The environment variable HOST_ARCH allows to override 'uname' to generate configuration files for a
-different architecture than the current one.
-
-where CPU is one of:
-
-    $qemu_target_list
+QEMU target list: $qemu_target_list
 
 EOF
 }
@@ -298,9 +318,15 @@ qemu_set_binfmts() {
     # probe cpu type
     host_family=$(qemu_get_family)
 
-    # register the interpreter for each cpu except for the native one
+    # reduce the list of target interpreters to those given in the CLI
+    targets=${@:-$QEMU_TARGET}
+    if [ "x$targets" = "xNONE" ] ; then
+      return
+    fi
+    qemu_check_target_list $targets
 
-    for cpu in ${qemu_target_list} ; do
+    # register the interpreter for each target except for the native one
+    for cpu in $checked_target_list ; do
         magic=$(eval echo \$${cpu}_magic)
         mask=$(eval echo \$${cpu}_mask)
         family=$(eval echo \$${cpu}_family)
@@ -328,12 +354,13 @@ BINFMT_SET=qemu_register_interpreter
 SYSTEMDDIR="/etc/binfmt.d"
 DEBIANDIR="/usr/share/binfmts"
 
+QEMU_TARGETS="${QEMU_TARGETS:-}"
 QEMU_PATH="${QEMU_PATH:-/usr/local/bin}"
 QEMU_SUFFIX="${QEMU_SUFFIX:-}"
 QEMU_PERSISTENT="${QEMU_PERSISTENT:-no}"
 QEMU_CREDENTIAL="${QEMU_CREDENTIAL:-no}"
 
-options=$(getopt -o ds:Q:S:e:hcp -l debian,systemd:,path:,suffix:,exportdir:,help,credential,persistent -- "$@")
+options=$(getopt -o dsQ:S:e:hcp -l debian,systemd,path:,suffix:,exportdir:,help,credential,persistent -- "$@")
 eval set -- "$options"
 
 while true ; do
@@ -347,23 +374,6 @@ while true ; do
         CHECK=qemu_check_systemd
         BINFMT_SET=qemu_generate_systemd
         EXPORTDIR=${EXPORTDIR:-$SYSTEMDDIR}
-        shift
-        # check given cpu is in the supported CPU list
-        if [ "$1" != "ALL" ] ; then
-            for cpu in ${qemu_target_list} ; do
-                if [ "$cpu" = "$1" ] ; then
-                    break
-                fi
-            done
-
-            if [ "$cpu" = "$1" ] ; then
-                qemu_target_list="$1"
-            else
-                echo "ERROR: unknown CPU \"$1\"" 1>&2
-                usage
-                exit 1
-            fi
-        fi
         ;;
     -Q|--path)
         shift
@@ -394,5 +404,7 @@ while true ; do
     shift
 done
 
+shift
+
 $CHECK
-qemu_set_binfmts
+qemu_set_binfmts "$@"
-- 
2.25.1




^ permalink raw reply related	[flat|nested] 2+ messages in thread
* [PATCH v8 0/9] qemu-binfmt-conf.sh
@ 2020-03-07 17:04 unai.martinezcorral
  2020-03-07 18:54 ` [PATCH v8 7/9] qemu-binfmt-conf.sh: generalize <CPU> to positional [TARGETS] Unai Martinez-Corral
  0 siblings, 1 reply; 2+ messages in thread
From: unai.martinezcorral @ 2020-03-07 17:04 UTC (permalink / raw)
  To: qemu-devel; +Cc: riku.voipio, laurent

Hi,

This series reworks qemu-binfmt-conf.sh:

* Argument <CPU> from option '--systemd' is generalized to <TARGETS>, and it is
  accepted for any mode (default, debian or systemd). It can be a single target
  arch or a list of them.
* Option '-r|--clear' is added, which allows to remove an already registered
  target interpreter or a list of them. The implementation is functional but
  partial. Please, see the corresponding commit.
* Option '-t|--test' is added, which allows to execute the CHECK according
  to the provided arguments, but no interpreter is configured.
* Support to set options through environment variables: QEMU_TARGETS, QEMU_PATH,
  QEMU_SUFFIX, QEMU_PERSISTENT, QEMU_CREDENTIAL, QEMU_CLEAR and QEMU_TEST.

The following changes are not backward compatible:

* Option '--persistent' no longer requires/accepts an argument.
* Option '--credential' no longer requires/accepts an argument.
* Option '--systemd' no longer requires/accepts an argument.
* Option '--qemu-path' is renamed to '--path'.
* Option '--qemu-suffix' is renamed to '--suffix'.

The functionality of all of them is untouched. Changes are related to syntax only.

v8:

* Fix typos and address review comments

v7:

* Check that a interpreter exists before trying to remove it.

v6:

* Don't need to use "find".
* Put the ";;" at the same position.
* Set BINFMT_CLEAR to ':', to allow --test to work with --clear.
* Do not show DEBIANDIR and SYSTEMDDIR in the Env-variable column.

 Based on:

* [PATCH v5 0/10] qemu-binfmt-conf.sh
   * should have been [PATCH v5 0/9] qemu-binfmt-conf.sh
* [PATCH v4 0/10] qemu-binfmt-conf.sh
* [PATCH v3 0/10] qemu-binfmt-conf.sh
* [PATCH v2] qemu-binfmt-conf.sh: add CPUS, add --reset, make -p and -c boolean (no arg)
* [PATCH] qemu-binfmt-conf.sh: add CPUS, add --reset, make -p and -c boolean (no arg)
* scripts/qemu-binfmt-conf.sh: allow clearing of entries

Regards

Unai Martinez-Corral (9):
      qemu-binfmt-conf.sh: enforce safe style consistency
      qemu-binfmt-conf.sh: make opts -p and -c boolean
      qemu-binfmt-conf.sh: add QEMU_CREDENTIAL and QEMU_PERSISTENT
      qemu-binfmt-conf.sh: use the same presentation format as for qemu-*
      qemu-binfmt-conf.sh: remove 'qemu' prefix from cli options
      qemu-binfmt-conf.sh: honour QEMU_PATH and/or QEMU_SUFFIX
      qemu-binfmt-conf.sh: generalize <CPU> to positional TARGETS
      qemu-binfmt-conf.sh: add option --clear
      qemu-binfmt-conf.sh: add --test

scripts/qemu-binfmt-conf.sh | 211
1 file changed, 133 insertions(+), 78 deletions(-)



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