[PATCH v3] Add TRACKING.IMPORTS to xen.git to more easily manage imported files that need to be kept in sync with an upstream

[Lars Kurth <lars.kurth@citrix.com>]

Following the recent discussion, we had on IRC and the action I had in 
the March community call, this file provides a file format that 
enables writing an automated test to check whether files are out of sync. 

An example, what file content may look like is embedded below
repo: linux-torvalds git https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
file: xen/drivers/passthrough/arm/smmu.c linux-torvalds linux/drivers/iommu/arm-smmu.c b77cf11f094136

Once the file format is agree, I will write a test or script.

I also need some more correct test data, aka entries in the file from
committers looking after the following files
[Jan]
xen/arch/x86/cpu/mwait-idle.c 
[Stefano, Julien - this has to be finalized]
xen/drivers/passthrough/arm/smmu.c
xen/arch/arm/vgic/*
xen/include/asm-arm/div64.h
xen/drivers/char/meson-uart.c
xen/arch/arm/arm32/lib/*
xen/arch/arm/arm64/lib/*
xen/arch/arm/arm64/cache.S
xen/arch/arm/arm64/bpi.S
xen/include/asm-arm/system.h
xen/arch/arm/arm64/insn.c
[Others?]
xen/common/rbtree.c

Note that in some cases Linux has diverged and some Linux files have disappeared. 
Julien also raised the point, that in some cases only a subset of code from Linux Xen files was applied or that only some functions get moved across to Xen.

I believe that is entirely OK. The workflow would be in most cases that:
- We use a Linux (source) commit as a benchmark and record the commit ID
- If there is a change in Linux the test will fail
- The committer looks at the diff and either
  - Decides to ignore it and bumps the commit ID in this file
  - Decides the change is needed, integrates it into Xen and then 
    bumps the commit ID in this file

Changes since v1
* Require a colon after repo:, file:, ... keywords
* Replace manual:|auto: with file: as there auto: use-case was invalid
* Added more verbose description of format

Changes since v2
* Changed some formatting
* Removed examples
* Removed references to https

Signed-off-by: Lars Kurth <lars.kurth@citrix.com>
CC: committers@xenproject.org
---
 TRACKING.FILES | 44 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 TRACKING.FILES

diff --git a/TRACKING.FILES b/TRACKING.FILES
new file mode 100644
index 0000000000..60c47bdefb
--- /dev/null
+++ b/TRACKING.FILES
@@ -0,0 +1,44 @@
+# This file contains information about source files that have been
+# copied from other sources and need to be tracked
+#
+# The file may contain lines starting with ...
+# --------------------------------------------
+# version: of file format
+# repo: repository definition
+# file: a mapping to track files
+#
+# Note that repo: entries must come *before* file: entries
+#
+# Repository Definitions are of the following format
+# --------------------------------------------------
+# repo: name-of-source-repo git|svn url-of-source-repo
+#
+# name-of-source-repo
+#   Name of source repository. The name will be used as reference in file:
+#   statements
+#
+# git|svn
+#   Type of source repository
+#
+# url-of-source-repo
+#   URL of source repository
+#
+# Mappings to track files are of the following format
+# ---------------------------------------------------
+# file: xen-file name-of-original-repo original-file commit-id
+#
+# xen-file
+#   Xen file that needs to be tracked
+#
+# name-of-original-repo
+#   A reference to a source repository defined by *repo* keyword
+#
+# original-file
+#   File in original-repo from which we regularly want to merge changes
+#   into xen-file
+#
+# commit id
+#   Last commit id of original-file that was deemed to be ok
+#   and either imported into the tree or rejected
+
+version: 1
-- 
2.13.0


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