support/dependencies/check-host-cmake.sh: verify version argument

When running 'make show-info-all' without a '.config', it is possible to
trigger this script without passing a version number.

The 'show-info-all' target is special because it forces the reading of
all packages without requiring a .config, so BR2_HOST_CMAKE_AT_LEAST is
unset and the script is called as:
  check-host-cmake.sh cmake cmake3

Without validation, the integer comparisons below would produce errors
like:
  check-host-cmake.sh: line 37: [: cmake: integer expected

It's possible to trigger this by adding the following file somewhere in
you path:

cat >/bin/cmake3 <<EOF
echo "cmake version 4.3.3 CMake suite maintained and supported by Kitware (kitware.com/cmake)."
EOF
make show-info-all

The same issue can also occur with pkg-stats.

Signed-off-by: Thomas Perale <thomas.perale@mind.be>
Signed-off-by: Arnout Vandecappelle <arnout@rnout.be>
(cherry picked from commit e7533662a4)
Signed-off-by: Thomas Perale <thomas.perale@mind.be>

support/dependencies/check-host-cmake.sh

@@ -6,6 +6,18 @@
 major_min="${1%.*}"
 minor_min="${1#*.}"
 
+# When running 'make show-info-all' or pkg-stats, it is possible to trigger this
+# script without passing a version number. These cases are special because they
+# force the reading of all packages without requiring a .config, so
+# BR2_HOST_CMAKE_AT_LEAST is unset and the script is called as:
+#   check-host-cmake.sh cmake cmake3
+# Without validation, the integer comparisons below would produce errors like:
+#   check-host-cmake.sh: line 37: [: cmake: integer expected
+# The following lines checks we have a single digit number from $1 before
+# continuing the script.
+[ "${major_min}" -eq "${major_min}" ] 2>/dev/null || exit 1
+[ "${minor_min}" -eq "${minor_min}" ] 2>/dev/null || exit 1
+
 shift
 
 for candidate; do