Chris Laplante 9ba2f3b8c3 cve-check/cve-update-db-native: use lockfile to fix usage under multiconfig
Previously CVE_CHECK_DB_FILE / CVE_CHECK_DB_DIR was the same across
multiconfigs which led to a race condition wherein multiple
cve-update-db-native:do_populate_cve_db tasks could attempt to write to
the same sqlite database. This led to the following task failure:

    Error executing a python function in exec_python_func() autogenerated:

    The stack trace of python calls that resulted in this exception/failure was:
    File: 'exec_python_func() autogenerated', lineno: 2, function: <module>
         0001:
     *** 0002:do_populate_cve_db(d)
         0003:
    File: '/mnt/data/agent/work/74f119cccb44f133/yocto/sources/poky/meta/recipes-core/meta/cve-update-db-native.bb', lineno: 103, function: do_populate_cve_db
         0099:        if year == date.today().year:
         0100:            cve_f.write('CVE database update : %s\n\n' % date.today())
         0101:
         0102:    cve_f.close()
     *** 0103:    conn.commit()
         0104:    conn.close()
         0105:}
         0106:
         0107:def initialize_db(c):
    Exception: sqlite3.OperationalError: disk I/O error

Use a lockfile to ensure multiple tasks don't step over each other.

(From OE-Core rev: 24e9380643a2ae3fcae193519cb64aedaf682153)

Signed-off-by: Chris Laplante <chris.laplante@agilent.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
2020-09-10 13:48:26 +01:00

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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