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Don't modify CREDITS-FILE if it hasn't changed.

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We should always avoid rewriting a built file during `make install`
if nothing has changed since `make all`.  This is to help support
the typical installation process of compiling a package as yourself,
then installing it as root.

Forcing CREDITS-FILE to be always be rebuilt in the Makefile means
that CREDITS-GEN needs to check for a change and only update
CREDITS-FILE if the file content actually differs.  After all,
content is king in Git.

Signed-off-by: Junio C Hamano <junkio@cox.net>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
This commit is contained in:
Junio C Hamano 2007-02-25 02:18:11 -05:00 committed by Shawn O. Pearce
parent 981193786f
commit 92446aba47
1 changed files with 19 additions and 6 deletions
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25
CREDITS-GEN
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@ -20,8 +20,8 @@ tree_search ()
generate_credits ()
{
tip=$1 &&
rm -f $CF &&
git shortlog -n -s $tip | sed 's/: .*$//' >$CF || exit
rm -f "$2" &&
git shortlog -n -s $tip | sed 's/: .*$//' >"$2" || exit
}
# Always use the tarball credits file if found, just
@ -36,10 +36,14 @@ generate_credits ()
# that fact.
#
credits_tmp=/var/tmp/gitgui-credits-$$
trap 'rm -f "$credits_tmp"' 0
orig="$credits_tmp"
if test -f credits
then
rm -f $CF &&
cp credits $CF || exit
orig=credits
elif prefix="$(git rev-parse --show-prefix 2>/dev/null)" &&
test -n "$prefix" &&
head=$(git rev-list --max-count=1 HEAD -- . 2>/dev/null) &&
@ -47,12 +51,21 @@ elif prefix="$(git rev-parse --show-prefix 2>/dev/null)" &&
tip=$(tree_search $head $tree) &&
test -n "$tip"
then
generate_credits $tip || exit
generate_credits $tip "$orig" || exit
elif tip="$(git rev-parse --verify HEAD 2>/dev/null)" &&
test -n "$tip"
then
generate_credits $tip || exit
generate_credits $tip "$orig" || exit
else
echo "error: Cannot locate authorship information." >&2
exit 1
fi
if test -f "$orig" && cmp -s "$orig" "$CF"
then
: noop
else
rm -f "$CF" &&
cat "$orig" >"$CF"
fi