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Support Linux binfmt_misc and APE loading on Apple

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The "no modify self" variant of Actually Portable Executable is now
supported on all platforms. If you use `$(APE_NO_MODIFY_SELF)` then
ld.bfd will embed a 4096 byte ELF binary and a 4096 byte Macho file
which are installed on the fly to ${TMPDIR:-/tmp}, which enables us
launch the executable, without needing to copy the whole executable

To prevent it from copying a tiny executable to your temp directory
you need to install the `ape` command (renamed from ape-loader), to
a system path. For example:

    # FreeBSD / NetBSD / OpenBSD
    make -j8 o//ape/ape
    cp o//ape/ape /usr/bin/ape

    # Mac OS
    # make -j8 o//ape/ape.macho
    curl https://justine.lol/ape.macho >/usr/bin/ape
    chmod +x /usr/bin/ape

On Linux you can get even more performance with the new binfmt_misc
support which makes launching non-modifying APE binaries as fast as
launching ELF executables. Running the following command:

    # Linux
    ape/apeinstall.sh

Will copy APE loader to /usr/bin/ape and register with binfmt_misc
Lastly, this change also fixes a really interesting race condition
with OpenBSD thread joining.
This commit is contained in:
Justine Tunney 2022-05-21 07:52:58 -07:00
parent 7838edae88
commit db0d8dd806
31 changed files with 1089 additions and 305 deletions
Download patch file Download diff file Expand all files Collapse all files

63
ape/apeinstall.sh Executable file
View file

@ -0,0 +1,63 @@
#!/bin/sh
if ! [ x"$(uname -s)" = xLinux ]; then
echo this script is intended for linux binfmt_misc >&2
echo freebsd/netbsd/openbsd users can use release binary >&2
exit 1
fi
if [ -f o/depend ]; then
# mkdeps.com build was successfully run so assume we can build
echo >&2
echo running: make -j8 o//ape/ape >&2
make -j8 o//ape/ape || exit
echo done >&2
else
# no evidence we can build, use prebuilt one
mkdir -p o//ape || exit
cp -af build/bootstrap/ape o//ape/ape
fi
echo >&2
echo installing o//ape/ape to /usr/bin/ape >&2
echo sudo mv -f o//ape/ape /usr/bin/ape >&2
sudo mv -f o//ape/ape /usr/bin/ape || exit
echo done >&2
if [ -e /proc/sys/fs/binfmt_misc/APE ]; then
echo >&2
echo it looks like APE is already registered with binfmt_misc >&2
echo please check that it is mapped to ape not /bin/sh >&2
echo cat /proc/sys/fs/binfmt_misc/APE >&2
cat /proc/sys/fs/binfmt_misc/APE >&2
# TODO: we need better uninstall recommendations
# the following works fine for justine
# but might remove unrelated software?
# sudo sh -c 'echo -1 >/proc/sys/fs/binfmt_misc/status'
exit
fi
if ! [ -e /proc/sys/fs/binfmt_misc ]; then
echo >&2
echo loading binfmt_misc into your kernel >&2
echo you may need to edit configs to persist across reboot >&2
echo sudo modprobe binfmt_misc >&2
sudo modprobe binfmt_misc || exit
echo done >&2
fi
if ! [ -e /proc/sys/fs/binfmt_misc/register ]; then
echo >&2
echo mounting binfmt_misc into your kernel >&2
echo you may need to edit configs to persist across reboot >&2
echo sudo mount -t binfmt_misc none /proc/sys/fs/binfmt_misc >&2
sudo mount -t binfmt_misc none /proc/sys/fs/binfmt_misc || exit
echo done >&2
fi
echo >&2
echo registering APE with binfmt_misc >&2
echo you may need to edit configs to persist across reboot >&2
echo 'sudo sh -c "echo '"'"':APE:M::MZqFpD::/usr/bin/ape:'"'"' >/proc/sys/fs/binfmt_misc/register"' >&2
sudo sh -c "echo ':APE:M::MZqFpD::/usr/bin/ape:' >/proc/sys/fs/binfmt_misc/register" || exit
echo done >&2