[Buildroot] [git commit branch/2021.02.x] support/dependencies: detect and bailout when PATH contains spaces/TABs

Peter Korsgaard peter at korsgaard.com
Sun Mar 21 18:59:01 UTC 2021

commit: https://git.buildroot.net/buildroot/commit/?id=d0fcacae363eda25b7772a7e41c05850fb9eea1d
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/2021.02.x

In Makefiles, variables are split, filtered, and otherwise mangled on
a space as a separator. In a shell, they will also be split on TABs.

We split and filter and iterate on variables in a lot of places, and
most importantly, spaces in PATH is very seldom tested, if at all, so
a lot of packages will not be working properly in such a situation.

For example, the config.guess contains constructs that are not resilient
to a space in PATH:

    PATH=$PATH:/.attbin ; export PATH

Also, our fakedate will iterate over PATH:

    for P in `echo $PATH | tr ':' ' '`; do

Those are only two cases, but the first means basically all
autotools-based packages are susceptible to subtle breakage.

Furthermore, Buildroot itself does not support that the top-level or
output directories are in a path with spaces anyway.

So, instead of chasing all cases that might be potentially broken,
let's just detect the case and bail out, like we already do when PATH
contains a \n, or when it contains the current working directory.

Reported-by: Dan Raymond <draymond at foxvalley.net>
Signed-off-by: Yann E. MORIN <yann.morin.1998 at free.fr>
Cc: Arnout Vandecappelle (Essensium/Mind) <arnout at mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni at bootlin.com>
(cherry picked from commit e36974d9e8c30227dc492c03737ef5951452cb29)
Signed-off-by: Peter Korsgaard <peter at korsgaard.com>
 support/dependencies/dependencies.sh | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/support/dependencies/dependencies.sh b/support/dependencies/dependencies.sh
index b44d28682c..1954f038be 100755
--- a/support/dependencies/dependencies.sh
+++ b/support/dependencies/dependencies.sh
@@ -2,6 +2,9 @@
 # vi: set sw=4 ts=4:
 export LC_ALL=C
+TAB="$(printf '\t')"
 # Verify that grep works
 echo "WORKS" | grep "WORKS" >/dev/null 2>&1
@@ -35,9 +38,9 @@ case ":${PATH:-unset}:" in
 	echo "PATH environment variable. This doesn't work."
 	exit 1
-"*)	printf "\n"
-	printf "Your PATH contains a newline (\\\n) character.\n"
+(*" "*|*"${TAB}"*|*"${NL}"*)
+	printf "\n"
+	printf "Your PATH contains spaces, TABs, and/or newline (\\\n) characters.\n"
 	printf "This doesn't work. Fix you PATH.\n"
 	exit 1

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