Gentoo project describes the simpliest version of such wrapper in handbook https://www.gentoo.org/proj/en/base/embedded/handbook/?part=1&chap=5 Qemu upstream dont't want to add such wrapper (I don't know why) https://lists.gnu.org/archive/html/qemu-devel/2011-09/msg03841.html Gentoo users are unhappy https://bugs.gentoo.org/show_bug.cgi?id=512780 See Steev Klimaszewski's comment. Reproducible: Always Steps to Reproduce: 1. emerge -v qemu-user 2. rc-service qemu-binfmt start 3. cp $(which qemu-arm) dir/usr/bin 4. cp $(which qemu-arm-binfmt) dir/usr/bin 5. chroot dir/ After provided patches: 1. USE="binfmt-wrapper static-user" emerge -v qemu 2. rc-service qemu-binfmt-wrapper start 3. cp $(which qemu-arm) dir/usr/bin 4. cp $(which qemu-arm-binfmt-wrapper) dir/usr/bin 5. chroot dir/
Created attachment 380248 [details, diff] patch to qemu-2.0.0-r1.ebuild
Created attachment 380250 [details, diff] binfmt wrapper
Created attachment 380252 [details] binfmt-wrapper initd
You can checkout an example of binfmt wrapper's usage on my site https://www.puchuu.com/posts/aarch64-chroot.html
I just created a ppc LXC(had to patch the template a tiny bit first *): lxc-create -n jocke-ppc-org -t gentoo -- -a ppc -v ppc Added to lxc config(and created an empty qemu-ppc file): lxc.mount.entry=/usr/bin/qemu-ppc usr/bin/qemu-ppc none ro,bind 0 0 The lxc would not boot properly until I changed the binfmt flag from P to CO Do we really need the P flag in the binfmt? Why not just switch over to CO for all? *) Redefined chroot in lxc-gentoo template to chroot() { rr=$1 shift 1 proot -w / -r "${rr}" -q qemu-ppc "$@" } BTW, ssh generates a lot of: Invalid instruction NIP 6ff46584 LR 6ff46944 CTR 6fbd0504 XER 00000000 MSR 00006040 HID0 00000000 HF 00006000 idx 0 TB 00000000 00000000 as it tries differents insn to optimize. Is there a way to tell qemu to stop logging these msgs?
Why do you even need such a wrapper? Run QEMU_CPU=cortex-a8 chroot dir As far as echo 'blablabla' > /.../binfmt goes, I know the ARM one was broken ~2-3 years ago.
I too really need this. If there is a problem adding this to the qemu ebuild, perhaps it can be its own package instead? I don't see any hard deps on qemu itself so maybe easier to do a qemu-binfmt.ebuild instead?
(In reply to Fedja Beader from comment #6) > Why do you even need such a wrapper? > > Run QEMU_CPU=cortex-a8 chroot dir > > > As far as echo 'blablabla' > /.../binfmt goes, I know the ARM one was broken > ~2-3 years ago. This is not about the CPU, it is about argv[0] handling. Try booting a lxc container under qemu
One thing hit me, this wrapper has a dynamic connection to qemu-arch so in cahr och chroot/lxc one need both qemu-arch and the wrapper in the chroot FS. It would be better to patch qemu-user directly(aka busybos) so it can do the wrapper thing directly.
I just sent this patch uptream: From 707dd7b2ae97d7a7fdd2e3c4da0f6c5997aff5ac Mon Sep 17 00:00:00 2001 From: Joakim Tjernlund <Joakim.Tjernlund@transmode.se> Date: Mon, 14 Jul 2014 16:23:39 +0200 Subject: [PATCH] linux-user: Add binfmt wrapper The popular binfmt-wrapper patch adds an additional executable which mangle argv suitable for binfmt flag P. In a chroot you need the both (statically linked) qemu-$arch and qemu-$arch-binfmt-wrapper. This is sub optimal and a better approach is to recognize the -binfmt-wrapper extension within linux-user(qemu-$arch) and mangle argv there. This just produces on executable which can be either copied to the chroot or bind mounted with the appropriate -binfmt-wrapper suffix. Signed-off-by: Joakim Tjernlund <Joakim.Tjernlund@transmode.se> --- linux-user/main.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/linux-user/main.c b/linux-user/main.c index 71a33c7..212067a 100644 --- a/linux-user/main.c +++ b/linux-user/main.c @@ -3828,6 +3828,19 @@ int main(int argc, char **argv, char **envp) int i; int ret; int execfd; + char *binfmt; + + i = strlen( argv[0] ) - strlen ( "-binfmt-wrapper" ); + binfmt = argv[0] + i; + if (i > 0 && strcmp ( binfmt, "-binfmt-wrapper" ) == 0) { + if (argc < 3 ) { + fprintf ( stderr, "%s: Please use me through binfmt with P flag\n", argv[0] ); + exit(1); + } + handle_arg_argv0(argv[2]); /* binfmt wrapper */ + memmove(&argv[2], &argv[3], (argc-2)*sizeof(argv)); + argc--; + } module_call_init(MODULE_INIT_QOM); -- 1.8.5.5
Even better patch, has a change to be included in upstream too, apply and change you binfmt to OP and you are done: From 9642c6e122a7c12c68a6c09a1ebb713c4935956d Mon Sep 17 00:00:00 2001 From: Joakim Tjernlund <Joakim.Tjernlund@transmode.se> Date: Mon, 14 Jul 2014 20:17:28 +0200 Subject: [PATCH v2] linux-user: make binfmt flag O require P Qemu can autodetect if it is started from Linux binfmt loader when binfmt flag O is on. Use that and require binfmt flag P as well which will enable QEMU to pass in correct argv0 to the application. Signed-off-by: Joakim Tjernlund <Joakim.Tjernlund@transmode.se> --- linux-user/main.c | 13 ++++++++++++- scripts/qemu-binfmt-conf.sh | 36 ++++++++++++++++++------------------ 2 files changed, 30 insertions(+), 19 deletions(-) diff --git a/linux-user/main.c b/linux-user/main.c index 71a33c7..9736768 100644 --- a/linux-user/main.c +++ b/linux-user/main.c @@ -3829,6 +3829,18 @@ int main(int argc, char **argv, char **envp) int ret; int execfd; + execfd = qemu_getauxval(AT_EXECFD); + if (execfd > 0 ) { + if (argc < 3) { + fprintf(stderr, "%s: Please use me through binfmt with P flag\n", + argv[0]); + exit(1); + } + handle_arg_argv0(argv[2]); /* binfmt wrapper */ + memmove(&argv[2], &argv[3], (argc-2)*sizeof(argv)); + argc--; + } + module_call_init(MODULE_INIT_QOM); if ((envlist = envlist_create()) == NULL) { @@ -4003,7 +4015,6 @@ int main(int argc, char **argv, char **envp) cpu->opaque = ts; task_settid(ts); - execfd = qemu_getauxval(AT_EXECFD); if (execfd == 0) { execfd = open(filename, O_RDONLY); if (execfd < 0) { diff --git a/scripts/qemu-binfmt-conf.sh b/scripts/qemu-binfmt-conf.sh index 289b1a3..36fcb8f 100644 --- a/scripts/qemu-binfmt-conf.sh +++ b/scripts/qemu-binfmt-conf.sh @@ -31,42 +31,42 @@ esac # register the interpreter for each cpu except for the native one if [ $cpu != "i386" ] ; then - echo ':i386:M::\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x03\x00:\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/local/bin/qemu-i386:' > /proc/sys/fs/binfmt_misc/register - echo ':i486:M::\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x06\x00:\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/local/bin/qemu-i386:' > /proc/sys/fs/binfmt_misc/register + echo ':i386:M::\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x03\x00:\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/local/bin/qemu-i386:PO' > /proc/sys/fs/binfmt_misc/register + echo ':i486:M::\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x06\x00:\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/local/bin/qemu-i386:PO' > /proc/sys/fs/binfmt_misc/register fi if [ $cpu != "alpha" ] ; then - echo ':alpha:M::\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x26\x90:\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/local/bin/qemu-alpha:' > /proc/sys/fs/binfmt_misc/register + echo ':alpha:M::\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x26\x90:\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/local/bin/qemu-alpha:PO' > /proc/sys/fs/binfmt_misc/register fi if [ $cpu != "arm" ] ; then - echo ':arm:M::\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28\x00:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/local/bin/qemu-arm:' > /proc/sys/fs/binfmt_misc/register - echo ':armeb:M::\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/local/bin/qemu-armeb:' > /proc/sys/fs/binfmt_misc/register + echo ':arm:M::\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28\x00:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/local/bin/qemu-arm:PO' > /proc/sys/fs/binfmt_misc/register + echo ':armeb:M::\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/local/bin/qemu-armeb:PO' > /proc/sys/fs/binfmt_misc/register fi if [ $cpu != "aarch64" ] ; then - echo ':aarch64:M::\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\xb7\x00:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/local/bin/qemu-aarch64:' > /proc/sys/fs/binfmt_misc/register + echo ':aarch64:M::\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\xb7\x00:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/local/bin/qemu-aarch64:PO' > /proc/sys/fs/binfmt_misc/register fi if [ $cpu != "sparc" ] ; then - echo ':sparc:M::\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x02:\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/local/bin/qemu-sparc:' > /proc/sys/fs/binfmt_misc/register + echo ':sparc:M::\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x02:\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/local/bin/qemu-sparc:PO' > /proc/sys/fs/binfmt_misc/register fi if [ $cpu != "ppc" ] ; then - echo ':ppc:M::\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x14:\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/local/bin/qemu-ppc:' > /proc/sys/fs/binfmt_misc/register + echo ':ppc:M::\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x14:\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/local/bin/qemu-ppc:PO' > /proc/sys/fs/binfmt_misc/register fi if [ $cpu != "m68k" ] ; then echo 'Please check cpu value and header information for m68k!' - echo ':m68k:M::\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x04:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/local/bin/qemu-m68k:' > /proc/sys/fs/binfmt_misc/register + echo ':m68k:M::\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x04:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/local/bin/qemu-m68k:PO' > /proc/sys/fs/binfmt_misc/register fi if [ $cpu != "mips" ] ; then # FIXME: We could use the other endianness on a MIPS host. - echo ':mips:M::\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/local/bin/qemu-mips:' > /proc/sys/fs/binfmt_misc/register - echo ':mipsel:M::\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08\x00:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/local/bin/qemu-mipsel:' > /proc/sys/fs/binfmt_misc/register - echo ':mipsn32:M::\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/local/bin/qemu-mipsn32:' > /proc/sys/fs/binfmt_misc/register - echo ':mipsn32el:M::\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08\x00:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/local/bin/qemu-mipsn32el:' > /proc/sys/fs/binfmt_misc/register - echo ':mips64:M::\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/local/bin/qemu-mips64:' > /proc/sys/fs/binfmt_misc/register - echo ':mips64el:M::\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08\x00:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/local/bin/qemu-mips64el:' > /proc/sys/fs/binfmt_misc/register + echo ':mips:M::\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/local/bin/qemu-mips:PO' > /proc/sys/fs/binfmt_misc/register + echo ':mipsel:M::\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08\x00:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/local/bin/qemu-mipsel:PO' > /proc/sys/fs/binfmt_misc/register + echo ':mipsn32:M::\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/local/bin/qemu-mipsn32:PO' > /proc/sys/fs/binfmt_misc/register + echo ':mipsn32el:M::\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08\x00:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/local/bin/qemu-mipsn32el:PO' > /proc/sys/fs/binfmt_misc/register + echo ':mips64:M::\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/local/bin/qemu-mips64:PO' > /proc/sys/fs/binfmt_misc/register + echo ':mips64el:M::\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08\x00:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/local/bin/qemu-mips64el:PO' > /proc/sys/fs/binfmt_misc/register fi if [ $cpu != "sh" ] ; then - echo ':sh4:M::\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x2a\x00:\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/local/bin/qemu-sh4:' > /proc/sys/fs/binfmt_misc/register - echo ':sh4eb:M::\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x2a:\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/local/bin/qemu-sh4eb:' > /proc/sys/fs/binfmt_misc/register + echo ':sh4:M::\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x2a\x00:\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/local/bin/qemu-sh4:PO' > /proc/sys/fs/binfmt_misc/register + echo ':sh4eb:M::\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x2a:\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/local/bin/qemu-sh4eb:PO' > /proc/sys/fs/binfmt_misc/register fi if [ $cpu != "s390x" ] ; then - echo ':s390x:M::\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x16:\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/local/bin/qemu-s390x:' > /proc/sys/fs/binfmt_misc/register + echo ':s390x:M::\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x16:\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/local/bin/qemu-s390x:PO' > /proc/sys/fs/binfmt_misc/register fi -- 1.8.5.5
This patch can be added on to if you want both: From a7a847f50470168ad18fcca5ce32c9e6ed468b00 Mon Sep 17 00:00:00 2001 From: Joakim Tjernlund <Joakim.Tjernlund@transmode.se> Date: Mon, 14 Jul 2014 20:24:53 +0200 Subject: [PATCH] linux-user: Add binfmt wrapper The popular binfmt-wrapper patch adds an additional executable which mangle argv suitable for binfmt flag P. In a chroot you need the both (statically linked) qemu-$arch and qemu-$arch-binfmt-wrapper. This is sub optimal and a better approach is to recognize the -binfmt-wrapper extension within linux-user(qemu-$arch) and mangle argv there. This just produces on executable which can be either copied to the chroot or bind mounted with the appropriate -binfmt-wrapper suffix. Signed-off-by: Joakim Tjernlund <Joakim.Tjernlund@transmode.se> --- linux-user/main.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/linux-user/main.c b/linux-user/main.c index 9736768..039f3ba 100644 --- a/linux-user/main.c +++ b/linux-user/main.c @@ -3828,9 +3828,12 @@ int main(int argc, char **argv, char **envp) int i; int ret; int execfd; + char *binfmt; + i = strlen(argv[0]) - strlen("-binfmt-wrapper"); + binfmt = argv[0] + i; execfd = qemu_getauxval(AT_EXECFD); - if (execfd > 0 ) { + if (execfd > 0 || i > 0 && strcmp(binfmt, "-binfmt-wrapper") == 0) { if (argc < 3) { fprintf(stderr, "%s: Please use me through binfmt with P flag\n", argv[0]); -- 1.8.5.5
This is the latest version, likely to be applied upstream but probably not before 2.1. Remember to change binfmg flags from P to PO also.
Created attachment 380746 [details] detect binfmt when O flag is on and handle argv0 correctly You can skip the qemu-binfmt-conf.sh part as Gentoo does not use that script anyway.
Ping?
QEMU Team, this patch isn't going into 2.1 I hope you can manage this one as a gentoo addon until >2.1
ugh, your patches are a mess. never post them as a comment as bugzilla corrupts them, and it makes reading the bug a huge pain. i'm not sure i agree with the way you're hacking things into the linux-user main, but if upstream is going to take that stuff, then we can wait for them. this is not critical at all that i can see.
i was thinking that the wrapper would need to be compiled for each target, but that is not the case after all. i guess let's see how upstream wants to take things before we go merging stuff.
(In reply to SpanKY from comment #17) > ugh, your patches are a mess. never post them as a comment as bugzilla > corrupts them, and it makes reading the bug a huge pain. Yeah, noticed that and did the last patch as an attatchment, sorry. The first few patches are just hacks that worked but got refined as I gained a better understanding. > > i'm not sure i agree with the way you're hacking things into the linux-user > main, but if upstream is going to take that stuff, then we can wait for > them. this is not critical at all that i can see. Hmm, the last one has been reworked per upstream request, I even had to update their binfmt script too. It is semi critical as without P flag it sometimes work but not always in a LXC for instance.
(In reply to SpanKY from comment #18) > i was thinking that the wrapper would need to be compiled for each target, > but that is not the case after all. i guess let's see how upstream wants to > take things before we go merging stuff. Yes, the point is that the same qemu-ARCH should be usable as a binfmt interpreter and as a normal user app. Qemu-user is not the fastest moving part of qemu but hopfully it will show up in a few days. I am on vacation anyway :)
Comment on attachment 380250 [details, diff] binfmt wrapper fwiw, i wrote a similar wrapper and we use it CrOS now: https://chromium.googlesource.com/chromiumos/overlays/chromiumos-overlay/+/release-R38-6158.B/app-emulation/qemu-binfmt-wrapper/files/qemu-binfmt-wrapper.c
(In reply to SpanKY from comment #21) > Comment on attachment 380250 [details, diff] [details, diff] > binfmt wrapper > > fwiw, i wrote a similar wrapper and we use it CrOS now: > https://chromium.googlesource.com/chromiumos/overlays/chromiumos-overlay/+/ > release-R38-6158.B/app-emulation/qemu-binfmt-wrapper/files/qemu-binfmt- > wrapper.c ehh, why did you do that when my patch fixes the problem proper? Would be better if you also complained at upstream so they see that this is a problem. The only reason they haven't applied it is that the worry about breaking non distribution users setups.
(In reply to Joakim Tjernlund from comment #22) because mainline qemu doesn't yet work :)
This problem has been fixed a long time ago :-) With current qemu-2.8/qemu-2.9 and installed binfmt handlers: ( $ cd /tmp/arm-chroot $ unshare ... ) $ chroot . /bin/bash $ echo $0 /bin/bash where ps reports: ... \_ /usr/bin/qemu-arm /bin/bash
