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59 lines
1.5 KiB
59 lines
1.5 KiB
3 years ago
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#!/bin/sh
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# NB: -f prohibited in this shebang
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# check relevant kernel features availability
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CONFIGS=/boot/config-*
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GZ_OPTS="-comp gzip"
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XZ_OPTS="-comp xz"
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LZO_OPTS="-comp lzo"
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verbose() { [ -z "$GLOBAL_VERBOSE" ] || echo "** $@" >&2; }
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fatal() { echo "** error: $@" >&2; exit 1; }
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configured()
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{
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local option="CONFIG_$1"
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if grep -q "^$option" $CONFIGS; then
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verbose "${option%=*} available"
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return 0
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else
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return 1
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fi
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}
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ls $CONFIGS >&/dev/null || fatal "no stage1 kernel config found in /boot"
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# test for installer-required filesystems support
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configured "OVERLAY_FS=[my]" || configured "AUFS_FS=[my]" ||
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echo fatal "stage1 kernel must support overlayfs or aufs"
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for opt in SQUASHFS $GLOBAL_STAGE1_KCONFIG; do
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configured "$opt=[my]" || fatal "stage1 kernel must have $opt support"
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done
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verbose "GLOBAL_SQUASHFS: $GLOBAL_SQUASHFS"
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options()
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{
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# squashfs options: not really neccessary but better than none
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# NB: this config file should be carried over into install2
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if [ "$GLOBAL_SQUASHFS" != "fast" ] && configured "SQUASHFS_XZ=y"; then
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# NB: the decompression filter overhead might hurt
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# NB: there are arm, powerpc and some other filters too
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if [ "$GLOBAL_SQUASHFS" = "tight" ] && configured "X86"; then
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XZ_OPTS="$XZ_OPTS -b 524288 -Xbcj x86"
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else
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XZ_OPTS="$XZ_OPTS -b 262144"
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fi
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echo "$XZ_OPTS"
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else # go fast, or even faster if possible
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if configured "SQUASHFS_LZO=y"; then
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echo "$LZO_OPTS"
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else # safe default
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echo "$GZ_OPTS"
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fi
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fi
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}
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echo "PACK_SQUASHFS_OPTS=-no-recovery `options`" > /.image/squashcfg.mk
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