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92446aba47
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>
72 lines
1.6 KiB
Bash
Executable File
72 lines
1.6 KiB
Bash
Executable File
#!/bin/sh
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CF=CREDITS-FILE
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tip=
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tree_search ()
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{
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head=$1
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tree=$2
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for p in $(git rev-list --parents --max-count=1 $head 2>/dev/null)
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do
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test $tree = $(git rev-parse $p^{tree} 2>/dev/null) &&
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vn=$(git describe --abbrev=4 $p 2>/dev/null) &&
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case "$vn" in
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gitgui-[0-9]*) echo $p; break;;
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esac
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done
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}
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generate_credits ()
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{
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tip=$1 &&
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rm -f "$2" &&
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git shortlog -n -s $tip | sed 's/: .*$//' >"$2" || exit
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}
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# Always use the tarball credits file if found, just
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# in case we are somehow contained in a larger git
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# repository that doesn't actually track our state.
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# (At least one package manager is doing this.)
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#
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# We may be a subproject, so try looking for the merge
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# commit that supplied this directory content if we are
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# not at the toplevel. We probably will always be the
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# second parent in the commit, but we shouldn't rely on
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# that fact.
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#
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credits_tmp=/var/tmp/gitgui-credits-$$
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trap 'rm -f "$credits_tmp"' 0
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orig="$credits_tmp"
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if test -f credits
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then
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orig=credits
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elif prefix="$(git rev-parse --show-prefix 2>/dev/null)" &&
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test -n "$prefix" &&
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head=$(git rev-list --max-count=1 HEAD -- . 2>/dev/null) &&
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tree=$(git rev-parse --verify "HEAD:$prefix" 2>/dev/null) &&
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tip=$(tree_search $head $tree) &&
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test -n "$tip"
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then
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generate_credits $tip "$orig" || exit
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elif tip="$(git rev-parse --verify HEAD 2>/dev/null)" &&
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test -n "$tip"
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then
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generate_credits $tip "$orig" || exit
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else
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echo "error: Cannot locate authorship information." >&2
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exit 1
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fi
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if test -f "$orig" && cmp -s "$orig" "$CF"
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then
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: noop
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else
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rm -f "$CF" &&
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cat "$orig" >"$CF"
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fi
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