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objdiff is useful when doing large code cleanups. For example, when removing checkpatch warnings and errors from new drivers in the staging tree. objdiff can be used in conjunction with a git rebase to confirm that each commit made no changes to the resulting object code. It has the same return values as diff(1). This was written specifically to support adding the skein and threefish cryto drivers to the staging tree. I needed a programmatic way to confirm that commits changing >90% of the lines didn't inadvertently change the code. Temporary files (objdump output) are stored in /path/to/linux/.tmp_objdiff 'make mrproper' will remove this directory. Signed-off-by: Jason Cooper <jason@lakedaemon.net> Signed-off-by: Michal Marek <mmarek@suse.cz>
2.5 KiB
Executable File
2.5 KiB
Executable File
#!/bin/bash
objdiff - a small script for validating that a commit or series of commits
didn't change object code.
Copyright 2014, Jason Cooper jason@lakedaemon.net
Licensed under the terms of the GNU GPL version 2
usage example:
$ git checkout COMMIT_A
$
$ ./scripts/objdiff record path/to/*.o
$ git checkout COMMIT_B
$
$ ./scripts/objdiff record path/to/*.o
$ ./scripts/objdiff diff COMMIT_A COMMIT_B
$
And to clean up (everything is in .tmp_objdiff/*)
$ ./scripts/objdiff clean all
Note: 'make mrproper' will also remove .tmp_objdiff
GIT_DIR="git rev-parse --git-dir"
if [ -d "$GIT_DIR" ]; then TMPD="${GIT_DIR%git}tmp_objdiff"
[ -d "$TMPD" ] || mkdir "$TMPD"
else echo "ERROR: git directory not found." exit 1 fi
usage() { echo "Usage: $0 " echo " record " echo " diff " echo " clean all | " exit 1 }
dorecord() { [ $# -eq 0 ] && usage
FILES="$*"
CMT="`git rev-parse --short HEAD`"
OBJDUMP="${CROSS_COMPILE}objdump"
OBJDIFFD="$TMPD/$CMT"
[ ! -d "$OBJDIFFD" ] && mkdir -p "$OBJDIFFD"
for f in $FILES; do
dn="${f%/*}"
bn="${f##*/}"
[ ! -d "$OBJDIFFD/$dn" ] && mkdir -p "$OBJDIFFD/$dn"
# remove addresses for a more clear diff
# http://dummdida.tumblr.com/post/60924060451/binary-diff-between-libc-from-scientificlinux-and
$OBJDUMP -D "$f" | sed "s/^[[:space:]]\+[0-9a-f]\+//" \
>"$OBJDIFFD/$dn/$bn"
done
}
dodiff() { [ $# -ne 2 ] && [ $# -ne 0 ] && usage
if [ $# -eq 0 ]; then
SRC="`git rev-parse --short HEAD^`"
DST="`git rev-parse --short HEAD`"
else
SRC="`git rev-parse --short $1`"
DST="`git rev-parse --short $2`"
fi
DIFF="`which colordiff`"
if [ ${#DIFF} -eq 0 ] || [ ! -x "$DIFF" ]; then
DIFF="`which diff`"
fi
SRCD="$TMPD/$SRC"
DSTD="$TMPD/$DST"
if [ ! -d "$SRCD" ]; then
echo "ERROR: $SRCD doesn't exist"
exit 1
fi
if [ ! -d "$DSTD" ]; then
echo "ERROR: $DSTD doesn't exist"
exit 1
fi
$DIFF -Nurd $SRCD $DSTD
}
doclean() { [ $# -eq 0 ] && usage [ $# -gt 1 ] && usage
if [ "x$1" = "xall" ]; then
rm -rf $TMPD/*
else
CMT="`git rev-parse --short $1`"
if [ -d "$TMPD/$CMT" ]; then
rm -rf $TMPD/$CMT
else
echo "$CMT not found"
fi
fi
}
[ $# -eq 0 ] && usage
case "$1" in record) shift dorecord $* ;; diff) shift dodiff $* ;; clean) shift doclean $* ;; *) echo "Unrecognized command '$1'" exit 1 ;; esac