[Qemu-devel] [PATCH v3 10/10] qemu-binfmt-conf.sh: support QEMU_TARGETS

[Unai Martinez-Corral <unai.martinezcorral@ehu.eus>]

Rename CPUS to TARGETS, and support QEMU_TARGETS environment variable.
This does not break backward compatibility, because it is just a placeholder.

Consistently with 'path', 'suffix', 'persistent' and 'credential',
provide an environment variable to set the list of target architectures.
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 'ALL'.

Signed-off-by: Unai Martinez-Corral <unai.martinezcorral@ehu.eus>
---
 scripts/qemu-binfmt-conf.sh | 26 ++++++++++++++------------
 1 file changed, 14 insertions(+), 12 deletions(-)

diff --git a/scripts/qemu-binfmt-conf.sh b/scripts/qemu-binfmt-conf.sh
index 8ca2647ed0..0676f86512 100755
--- a/scripts/qemu-binfmt-conf.sh
+++ b/scripts/qemu-binfmt-conf.sh
@@ -6,7 +6,7 @@ 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 target CPUS is/are in the supported target list
+# check if given TARGETS is/are in the supported target list
 qemu_check_target_list() {
     all="$qemu_target_list"
     if [ "x$1" = "xALL" ] ; then
@@ -199,12 +199,12 @@ usage() {
     cat <<EOF
 Usage: qemu-binfmt-conf.sh [--help][--path PATH][--suffix SUFFIX]
                            [--persistent][--credential][--exportdir PATH]
-                           [--reset ARCHS][--systemd][--debian][CPUS]
+                           [--reset ARCHS][--systemd][--debian][TARGETS]

-    Configure binfmt_misc to use qemu interpreter for the given CPUS.
-    Supported formats for CPUS are: single arch or comma/space separated list.
-    See QEMU target list below. If CPUS is 'ALL' or empty, configure all known
-    cpus. If CPUS is 'NONE', no interpreter is configured.
+    Configure binfmt_misc to use qemu interpreter for the given TARGETS.
+    Supported formats for TARGETS are: single arch or comma/space separated list.
+    See QEMU target list below. If TARGETS is 'ALL' or empty, configure all known
+    TARGETS. If TARGETS is 'NONE', no interpreter is configured.

     --help:        display this usage.
     --path:        set path to qemu interpreter.
@@ -244,6 +244,7 @@ Usage: qemu-binfmt-conf.sh [--help][--path PATH][--suffix SUFFIX]
       QEMU_SUFFIX=
       QEMU_PERSISTENT=no
       QEMU_CREDENTIAL=no
+      QEMU_TARGETS=

 EOF
 }
@@ -324,17 +325,17 @@ EOF
 }

 qemu_set_binfmts() {
-    if [ "x$1" = "xNONE" ] ; then
-      return
-    fi
-
     # probe cpu type
     host_family=$(qemu_get_family)

     # reduce the list of target interpreters to those given in the CLI
-    targets="$@"
     if [ $# -eq 0 ] ; then
-      targets="ALL"
+      targets="${QEMU_TARGETS:-ALL}"
+    else
+      if [ "x$1" = "xNONE" ] ; then
+        return
+      fi
+      targets="$@"
     fi
     qemu_check_target_list $targets

@@ -391,6 +392,7 @@ QEMU_PATH="${QEMU_PATH:-/usr/local/bin}"
 QEMU_SUFFIX="${QEMU_SUFFIX:-}"
 QEMU_PERSISTENT="${QEMU_PERSISTENT:-no}"
 QEMU_CREDENTIAL="${QEMU_CREDENTIAL:-no}"
+QEMU_TARGETS="${QEMU_TARGETS:-}"

 options=$(getopt -o r:dsQ:S:e:hcp -l reset:,debian,systemd,path:,suffix:,exportdir:,help,credential,persistent -- "$@")
 eval set -- "$options"
--
2.20.1