07f948331f
- some were incorrectly marked GPL (libsel4 is BSD) - update NICTA --> DATA61 etc - fix tags D61 --> DATA61 - update year to 2017
54 lines
1.1 KiB
Bash
Executable file
54 lines
1.1 KiB
Bash
Executable file
#!/bin/bash
|
|
#
|
|
# Copyright 2017, Data61
|
|
# Commonwealth Scientific and Industrial Research Organisation (CSIRO)
|
|
# ABN 41 687 119 230.
|
|
#
|
|
# This software may be distributed and modified according to the terms of
|
|
# the BSD 2-Clause license. Note that NO WARRANTY is provided.
|
|
# See "LICENSE_BSD2.txt" for details.
|
|
#
|
|
# @TAG(NICTA_BSD)
|
|
#
|
|
|
|
#
|
|
# Execute a command that generates a single output file. If the output file is
|
|
# has unchanged contents, restore the old modification date to prevent GNU make
|
|
# et. al. from continuing building down the dependency chain.
|
|
#
|
|
|
|
if [ $# -le 1 ]; then
|
|
echo "Usage: $0 <output file> <cmd> [<cmd args> ...]"
|
|
exit 1
|
|
fi
|
|
|
|
# Get the target file
|
|
TARGET_FILE=$1
|
|
shift
|
|
|
|
# If the file doesn't exist, we always run the command.
|
|
if [ ! -e $TARGET_FILE ]; then
|
|
V=$@
|
|
sh -c "$V"
|
|
exit $?
|
|
fi
|
|
|
|
# Make a copy
|
|
TMP_FILE=`mktemp /tmp/XXXXXXXX`
|
|
cp -a $TARGET_FILE $TMP_FILE
|
|
|
|
# Run the command
|
|
V=$@
|
|
sh -c "$V"
|
|
ERROR_CODE=$?
|
|
|
|
# Restore the old file if the contents are the same.
|
|
if cmp $TMP_FILE $TARGET_FILE > /dev/null 2> /dev/null; then
|
|
mv -f $TMP_FILE $TARGET_FILE
|
|
else
|
|
rm -f $TMP_FILE
|
|
fi
|
|
|
|
# Return with the error code.
|
|
exit $ERROR_CODE
|
|
|