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, 52 insertions, 0 deletions

diff --git a/patches/opnfv-fuel/cross-bootstrap/0006-bootstrap-Use-gzip-instead-of-xz-compression.patch b/patches/opnfv-fuel/cross-bootstrap/0006-bootstrap-Use-gzip-instead-of-xz-compression.patch
new file mode 100644
index 00000000..ccbd3e1c
--- /dev/null
+++ b/patches/opnfv-fuel/cross-bootstrap/0006-bootstrap-Use-gzip-instead-of-xz-compression.patch
@@ -0,0 +1,52 @@
+From: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
+Date: Fri, 10 Jun 2016 22:30:29 +0200
+Subject: [PATCH] bootstrap: Use gzip instead of xz compression.
+
+bootstrap mksquashfs using qemu-user-static is extremely slow,
+taking up to one hour. gzip, on the other hand, is reasonably fast.
+According to [1], xz is slower, with not much size gain.
+
+[1] https://jonathancarter.org/2015/04/06/squashfs-performance-testing/
+
+Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
+---
+ .../post-scripts/80_prepare_cross_builds.sh           | 19 +++++++++++++++++++
+ 1 file changed, 19 insertions(+)
+
+diff --git a/build/f_isoroot/f_bootstrap/post-scripts/80_prepare_cross_builds.sh b/build/f_isoroot/f_bootstrap/post-scripts/80_prepare_cross_builds.sh
+index 12f66e6..3cb22f3 100755
+--- a/build/f_isoroot/f_bootstrap/post-scripts/80_prepare_cross_builds.sh
++++ b/build/f_isoroot/f_bootstrap/post-scripts/80_prepare_cross_builds.sh
+@@ -27,6 +27,11 @@ if which dpkg > /dev/null 2>&1; then
+       exit 1
+     fi
+
++    # Determine python site-packages directory location
++    PYTHON_SITEPKGS_DIR=$(python -c \
++      "from distutils.sysconfig import get_python_lib; print(get_python_lib())")
++    [ -d ${PYTHON_SITEPKGS_DIR} ] || exit 1
++
+     # Cross-build timeout adjustments
+     #
+     # Since `execute_shell_command` mcagent is used for building the target
+@@ -40,6 +45,20 @@ if which dpkg > /dev/null 2>&1; then
+     # the maximum timeout value for mcagent has to be increased (use 2h).
+     sed -i.bak -r 's/^(\s+:timeout\s*=>)\s*[[:digit:]]+$/\1 7200/' \
+       /usr/libexec/mcollective/mcollective/agent/execute_shell_command.ddl
++
++    # Bootstrap: Use gzip instead of xz compression.
++    #
++    # bootstrap mksquashfs via `qemu-user-static` is extremely slow,
++    # taking up to one hour. gzip, on the other hand, is reasonably fast.
++
++    # See the following article for a comparison between gzip and xz
++    # https://jonathancarter.org/2015/04/06/squashfs-performance-testing/
++    # xz is slower, with very little size gain.
++    if [ -f ${PYTHON_SITEPKGS_DIR}/fuel_bootstrap/consts.py ]; then
++      sed -i.bak -r "s/^(\s+'compress_format'\s*:\s*').*?('.*)$/\1gzip\2/g" \
++        ${PYTHON_SITEPKGS_DIR}/fuel_bootstrap/consts.py
++      echo "INFO: [xz] => [gzip] updated bootstrap initrd / rootfs compression."
++    fi
+   fi
+ fi
+