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+#!/bin/sh
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+
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+# Used to compare sstate checksums between MACHINES
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+# Execute script and compare generated list.M files
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+
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+# It's also usefull to keep older sstate checksums
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+# to be able to find out why something is rebuilding
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+# after updating metadata
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+
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+# $ diff \
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+# sstate-diff/1349348392/fake-cortexa8/list.M \
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+# sstate-diff/1349348392/fake-cortexa9/list.M \
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+# | wc -l
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+# 538
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+
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+# Then to compare sigdata use something like:
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+# $ ls sstate-diff/1349348392/*/armv7a-vfp-neon*/linux-libc-headers/*do_configure*sigdata*
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+# sstate-diff/1349348392/fake-cortexa8/armv7a-vfp-neon-oe-linux-gnueabi/linux-libc-headers/3.4.3-r0.do_configure.sigdata.cb73b3630a7b8191e72fc469c5137025
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+# sstate-diff/1349348392/fake-cortexa9/armv7a-vfp-neon-oe-linux-gnueabi/linux-libc-headers/3.4.3-r0.do_configure.sigdata.f37ada177bf99ce8af85914df22b5a0b
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+# $ bitbake-diffsigs stamps.1349348392/*/armv7a-vfp-neon*/linux-libc-headers/*do_configure*sigdata*
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+# basehash changed from 8d0bd67bb1da6f68717760fc3ef43171 to e869fa61426e88e9c30726ba88a1216a
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+# Variable TUNE_CCARGS value changed from -march=armv7-a -mthumb-interwork -mfloat-abi=softfp -mfpu=neon -mtune=cortex-a8 to -march=armv7-a -mthumb-interwork -mfloat-abi=softfp -mfpu=neon -mtune=cortex-a9
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+
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+# Global vars
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+tmpdir=
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+machines=
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+targets=
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+default_machines="qemuarm qemux86 qemux86-64"
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+default_targets="core-image-base"
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+
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+usage () {
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+ cat << EOF
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+Welcome to utility to compare sstate checksums between different MACHINEs.
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+$0 <OPTION>
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+
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+Options:
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+ -h, --help
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+ Display this help and exit.
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+
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+ --tmpdir=<tmpdir>
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+ Specify tmpdir, will use the environment variable TMPDIR if it is not specified.
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+ Something like /OE/oe-core/tmp-eglibc (no / at the end).
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+
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+ --machines=<machines>
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+ List of MACHINEs separated by space, will use the environment variable MACHINES if it is not specified.
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+ Default value is "qemuarm qemux86 qemux86-64".
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+
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+ --targets=<targets>
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+ List of targets separated by space, will use the environment variable TARGETS if it is not specified.
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+ Default value is "core-image-base".
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+EOF
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+}
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+
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+# Print error information and exit.
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+echo_error () {
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+ echo "ERROR: $1" >&2
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+ exit 1
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+}
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+
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+while [ -n "$1" ]; do
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+ case $1 in
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+ --tmpdir=*)
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+ tmpdir=`echo $1 | sed -e 's#^--tmpdir=##' | xargs readlink -e`
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+ [ -d "$tmpdir" ] || echo_error "Invalid argument to --tmpdir"
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+ shift
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+ ;;
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+ --machines=*)
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+ machines=`echo $1 | sed -e 's#^--machines="*\([^"]*\)"*#\1#'`
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+ shift
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+ ;;
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+ --targets=*)
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+ targets=`echo $1 | sed -e 's#^--targets="*\([^"]*\)"*#\1#'`
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+ shift
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+ ;;
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+ --help|-h)
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+ usage
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+ exit 0
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+ ;;
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+ *)
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+ echo "Invalid arguments $*"
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+ echo_error "Try '$0 -h' for more information."
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+ ;;
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+ esac
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+done
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+
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+# tmpdir directory, use environment variable TMPDIR
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+# if it was not specified, otherwise, error.
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+[ -n "$tmpdir" ] || tmpdir=$TMPDIR
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+[ -n "$tmpdir" ] || echo_error "No tmpdir found!"
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+[ -d "$tmpdir" ] || echo_error "Invalid tmpdir \"$tmpdir\""
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+[ -n "$machines" ] || machines=$MACHINES
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+[ -n "$machines" ] || machines=$default_machines
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+[ -n "$targets" ] || targets=$TARGETS
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+[ -n "$targets" ] || targets=$default_targets
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+
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+OUTPUT=${tmpdir}/sstate-diff/`date "+%s"`
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+
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+for M in ${machines}; do
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+ find ${tmpdir}/stamps/ -name \*sigdata\* | xargs rm -f
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+ mkdir -p ${OUTPUT}/${M}
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+ export MACHINE=${M}; bitbake -S ${targets} | tee -a ${OUTPUT}/${M}/log;
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+ cp -ra ${tmpdir}/stamps/* ${OUTPUT}/${M}
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+ find ${OUTPUT}/${M} -name \*sigdata\* | sed "s#${OUTPUT}/${M}/##g" | sort > ${OUTPUT}/${M}/list
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+ M_UNDERSCORE=`echo ${M} | sed 's/-/_/g'`
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+ sed "s/${M_UNDERSCORE}/MACHINE/g; s/${M}/MACHINE/g" ${OUTPUT}/${M}/list | sort > ${OUTPUT}/${M}/list.M
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+ find ${tmpdir}/stamps/ -name \*sigdata\* | xargs rm -f
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+done
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