bitbake: fetch/git: add support for disabling shared clones on unpack

By default the unpacker will create a "shared" clone when cloning from
the DL_DIR to the WORKDIR. This patch introduces an option to control
that behaviour.

Imagine some recipe steps are executed in a namespace that is different
from the one your downloader and unpacker ran in. (chroot) Because a
"shared" clone has an absolute reference to its "alternate" you now
have to make that "alternate" visible in that new namespace (chroot) at
the exact place.

With this patch you can unpack "noshared" and get a stand-alone copy.
This copy will also work if the "alternate" is not visible or existant.

The switch is a global bitbake switch and will affect all git urls.
Build systems that need "noshared" most likely need it for everything
they do with git.

(Bitbake rev: 6ae6f1865d5e666ebc670f70b7401a7b41648102)

Signed-off-by: Henning Schild <henning.schild@siemens.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 5 insertions, 1 deletions

diff --git a/bitbake/lib/bb/fetch2/git.py b/bitbake/lib/bb/fetch2/git.py
index e3ba80a3f5..3e25b4b604 100644
--- a/bitbake/lib/bb/fetch2/git.py
+++ b/bitbake/lib/bb/fetch2/git.py
@@ -168,7 +168,11 @@ class Git(FetchMethod):
         if len(branches) != len(ud.names):
             raise bb.fetch2.ParameterError("The number of name and branch parameters is not balanced", ud.url)
 
-        ud.cloneflags = "-s -n"
+        ud.noshared = d.getVar("BB_GIT_NOSHARED") == "1"
+
+        ud.cloneflags = "-n"
+        if not ud.noshared:
+            ud.cloneflags += " -s"
         if ud.bareclone:
             ud.cloneflags += " --mirror"