bkylerussell@gmail.com 7b27c85ed9 rpm: fix intermittent compression failure in do_package_write_rpm
rpmbuild can start processing random memory when processing the value
provided by XZ_THREADS, and unintentionally disable encoding for a
file descriptor that in fact requires encoding to be enabled in order
for lzwrite() to actually create an rpm.

  *** Fdopen(0x7f2030002b30,w6T16.xzdio)  | fdio 23 fp (nil)
  ==>     lzopen_internal("w6T16", 23, 1)
  ==>     lzopen_internal set encoding
  ==>     lzopen_internal clear encoding
  ==> Fdopen(0x7f2030002b30,"w6T16.xzdio") returns fd 0x7f2030002b30      | xzdio 0x7f2030004e30 fp 23 | fdio -1 fp (nil)
  ==>     lzwrite(0x7f2030004e30, 0x7f20789d8070, 6) encoding 0
  ==>     Fwrite(0x7f2030002b30,0x7f20789d8070,6) rc -1   | xzdio 0x7f2030004e30 fp 23 | fdio -1 fp (nil)
  error: create archive failed: cpio: write

When the encoding bit gets cleared on the LZFILE* struct, lzwrite() then
rightfully complains when it detects !lzfile->encoding, which then gets
bubbled up as a write failure when we go to create the archive.

This fix is available in the rpm 4.17-release.

(From OE-Core rev: b093005d31467d89b00af621f86eb5cac7f845af)

Signed-off-by: Kyle Russell <bkylerussell@gmail.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2022-02-23 23:43:42 +00:00
2021-12-08 20:28:01 +00:00

QEMU Emulation Targets
======================

To simplify development, the build system supports building images to
work with the QEMU emulator in system emulation mode. Several architectures
are currently supported in 32 and 64 bit variants:

  * ARM (qemuarm + qemuarm64)
  * x86 (qemux86 + qemux86-64)
  * PowerPC (qemuppc only)
  * MIPS (qemumips + qemumips64)

Use of the QEMU images is covered in the Yocto Project Reference Manual.
The appropriate MACHINE variable value corresponding to the target is given
in brackets.
Description
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