[PATCH] devshell: Fix wrong PATH value if disabled ccache

[Anton Mikanovich <amikan@ilbers.de>]

In case USE_CCACHE is set to 0 the value of PATH_PREPEND env variable
will be empty. This makes PATH in devshell looks like:

:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin

If building the packages having directories named the same as some
binaries used during the build (like dh-python with dh directory inside
its sources), it will fail with the following error:

...
 debian/rules binary
dh binary
make: dh: Permission denied
make: *** [debian/rules:4: binary] Error 127

Make devshell expand PATH only if PATH_PREPEND is non-empty.

Signed-off-by: Anton Mikanovich <amikan@ilbers.de>
---
 meta/classes/dpkg-base.bbclass | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/meta/classes/dpkg-base.bbclass b/meta/classes/dpkg-base.bbclass
index c02c07a8..4468a49a 100644
--- a/meta/classes/dpkg-base.bbclass
+++ b/meta/classes/dpkg-base.bbclass
@@ -258,7 +258,7 @@ python do_devshell() {
         apt-get -y -q update -o Dir::Etc::SourceList=\"sources.list.d/isar-apt.list\" -o Dir::Etc::SourceParts=\"-\" -o APT::Get::List-Cleanup=\"0\"; \
         apt-get -y upgrade; \
         {2}; \
-        export PATH=$PATH_PREPEND:$PATH; \
+        if [ -n \"$PATH_PREPEND\" ]; then export PATH=$PATH_PREPEND:$PATH; fi; \
         $SHELL -i \
     '"
     oe_terminal(termcmd.format(schroot, pp_pps, install_deps), "Isar devshell", d)
-- 
2.34.1

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