[build] Improve overlay check in Makefile (#3050)
Some kernels are built with overlayfs as a builtin and not a module. For these the check via lsmod currently fails. This improvement now checks the kernel configuration for the CONFIG_OVERLAY_FS entry. Depending on the OS and kernel version the build configuration can be in multiple places.
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@ -61,7 +61,11 @@ SLAVE_IMAGE = sonic-slave-$(USER)
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SLAVE_DIR = sonic-slave
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SLAVE_DIR = sonic-slave
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endif
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endif
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OVERLAY_MODULE_CHECK := lsmod | grep "^overlay " > /dev/null 2>&1 || (echo "ERROR: Module 'overlay' not loaded. Try running 'sudo modprobe overlay'."; exit 1)
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OVERLAY_MODULE_CHECK := \
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lsmod | grep -q "^overlay " &>/dev/null || \
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zgrep -q 'CONFIG_OVERLAY_FS=y' /proc/config.gz &>/dev/null || \
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grep -q 'CONFIG_OVERLAY_FS=y' /boot/config-$(shell uname -r) &>/dev/null || \
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(echo "ERROR: Module 'overlay' not loaded. Try running 'sudo modprobe overlay'."; exit 1)
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BUILD_TIMESTAMP := $(shell date +%Y%m%d\.%H%M%S)
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BUILD_TIMESTAMP := $(shell date +%Y%m%d\.%H%M%S)
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