build: Rework patch mechanism for Fuel submodules

While refactoring the patching mechanism, take care of:
- Sync submodule handling with Fuel@OPFNV;
- build: Investigate/prepare for moving patches to Fuel@OPNFV;
- build: Investigate divergent fuel-mirror;
- ISO build: cacheid for Fuel comps should not depend on
  Armband git commit;

CHANGE:
 Rename/shuffle patches while grouping them in "features",
 preparing for upstreaming them to Fuel@OPNFV and beyond.

CHANGE:
 Allow linking patches for better representing the dependency
 between one patch and different features.
 e.g. 0001-Add-arch-to-nailgun-release-and-target-image.patch:
   - part of `multiarch-fuel`, because it extends Fuel;
   - part of `direct-kernel-boot`, as arch is required for that;
   - part of `cross-bootstrap`, target image is arch-dependent;
 NOTE: Patch links are not staged to Fuel@OPNFV, they only serve
 as markers that a specific patch is part of a feature.

CHANGE:
 Kill all Fuel component submodules, now handled in Fuel@OPNFV:
  - fuel-agent
  - fuel-astute
  - fuel-library
  - fuel-mirror
  - fuel-nailgun-agent
  - fuel-web

CHANGE:
 Move armband-fuel-config.mk to armband git root.

FIXME: m1.micro-Increase-profile-RAM-size-to-128MB.patch is NOT
 part of `cross-bootstrap` feature, but patch context says so ...

FIXME: 0001-Add-arm64-deb-repositories-setup.patch is broken at
 `make patches-export` by removing spaces at EOL.

v2 -> v3:
 * Phony patch support (links to show a patch belongs to a feature);
 * Updated README.md
v3 -> v7:
 * Re-export Fuel submodules & plugins patches (update patch context);
 * Update Cavium mail addresses (s/caviumnetworks.com/cavium.com/);
 * Ignore submodule changes;
 * Add armband git repo info to gitinfo_fuel.txt at build time;

Implements: ARMBAND-136
Closes-bug: ARMBAND-95
Closes-bug: ARMBAND-93
Closes-bug: ARMBAND-92

Change-Id: I1a236d9f43b2e6dca22055911f696b43c22b5973
Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

1 files changed, 55 insertions, 0 deletions

diff --git a/patches/fuel-agent/cross-bootstrap/0003-Fix-qemu-user-static-replacement.patch b/patches/fuel-agent/cross-bootstrap/0003-Fix-qemu-user-static-replacement.patch
new file mode 100644
index 00000000..3c849591
--- /dev/null
+++ b/patches/fuel-agent/cross-bootstrap/0003-Fix-qemu-user-static-replacement.patch
@@ -0,0 +1,55 @@
+From: Stanislaw Kardach <stanislaw.kardach@cavium.com>
+Date: Sun, 6 Mar 2016 16:09:39 +0100
+Subject: [PATCH] Fix qemu-user-static replacement
+
+---
+ fuel_agent/manager.py     |  6 ++++++
+ fuel_agent/utils/build.py | 18 ++++++++++++++++++
+ 2 files changed, 24 insertions(+)
+
+diff --git a/fuel_agent/manager.py b/fuel_agent/manager.py
+index ba1ab78..637c99a 100644
+--- a/fuel_agent/manager.py
++++ b/fuel_agent/manager.py
+@@ -760,6 +760,12 @@ class Manager(object):
+         fu.mount_bind(chroot, '/proc')
+         bu.populate_basic_dev(chroot)
+
++        # we need to make sure that qemu-{target_arch}-static binary is
++        # not replaced inside chroot because we're possibly using it
++        # through qemu-debootstrap
++        LOG.debug('Preventing qemu-user-static replacement inside chroot')
++        bu.prevent_qemu_replacement(chroot, CONF.target_arch)
++
+     def destroy_chroot(self, chroot):
+         # Umount chroot tree and remove images tmp files
+         if not bu.stop_chrooted_processes(chroot, signal=signal.SIGTERM):
+diff --git a/fuel_agent/utils/build.py b/fuel_agent/utils/build.py
+index 74cbfd8..1bc0a5f 100644
+--- a/fuel_agent/utils/build.py
++++ b/fuel_agent/utils/build.py
+@@ -320,6 +320,24 @@ def populate_basic_dev(chroot):
+     utils.execute('chroot', chroot,
+                   'ln', '-s', '/proc/self/fd', '/dev/fd')
+
++def prevent_qemu_replacement(chroot, arch):
++    """Prevents qemu-user-static replacement inside chroot.
++
++    Use dpkg-divert to prevent replacing qemu-user-static binary inside
++    chroot which is necessary for host-side qemu-debootstrap to work
++    properly."""
++    if arch == 'arm64':
++        qemu = 'qemu-aarch64-static'
++    elif arch == 'amd64':
++        qemu = 'qemu-x86_64-static'
++    utils.execute('chroot', chroot,
++                  'dpkg-divert', '--divert', '/usr/bin/%s.orig' % qemu,
++                  '/usr/bin/%s' % qemu)
++    utils.execute('chroot', chroot,
++                  'dpkg-divert', '--divert', '/usr/sbin/update-binfmts.orig',
++                  '--rename', '/usr/sbin/update-binfmts')
++    utils.execute('chroot', chroot, 'ln', '-sf', '/bin/true',
++                  '/usr/sbin/update-binfmts')
+
+ def create_sparse_tmp_file(dir, suffix, size=8192):
+     """Creates sparse file.