[libvirt] [PATCH] build: fix incremental autogen.sh when no AUTHORS is present

[Laine Stump]

On 12/03/2012 03:14 PM, Eric Blake wrote:
> Commit 71d1256 tried to fix a problem where rebasing an old
> branch on top of newer libvirt.git resulted in automake failing
> because of a missing AUTHORS file.  However, while the fix
> worked for an incremental 'make', it did not work for someone
> that directly reran './autogen.sh'.  Reported by Laine Stump.
>
> * autogen.sh (autoreconf): Check for same conditions as cfg.mk.
> * cfg.mk (_update_required): Add comments.
> ---
>  autogen.sh |    3 ++-
>  cfg.mk     |    2 ++
>  2 files changed, 4 insertions(+), 1 deletions(-)
>
> diff --git a/autogen.sh b/autogen.sh
> index 126b272..d4957f1 100755
> --- a/autogen.sh
> +++ b/autogen.sh
> @@ -69,14 +69,15 @@ if test -d .git; then
>          *:set) ;;
>          *-dirty*)
>              echo "error: gnulib submodule is dirty, please investigate" 2>&1
>              echo "set env-var CLEAN_SUBMODULE to discard gnulib changes" 2>&1
>              exit 1 ;;
>      esac
> +    # Keep this test in sync with cfg.mk:_update_required
>      if test "$t" = "$(cat $curr_status 2>/dev/null)" \
> -        && test -f "po/Makevars"; then
> +        && test -f "po/Makevars" && test -f AUTHORS; then
>          # good, it's up to date, all we need is autoreconf
>          autoreconf -if
>      else
>          if test ${CLEAN_SUBMODULE+set}; then
>              echo cleaning up submodules...
>              git submodule foreach 'git clean -dfqx && git reset --hard'
> diff --git a/cfg.mk b/cfg.mk
> index ec4ab1c..c4ae195 100644
> --- a/cfg.mk
> +++ b/cfg.mk
> @@ -688,12 +688,14 @@ ifeq (0,$(MAKELEVEL))
>    # in column 1 and does not print a "git describe"-style string after the
>    # submodule name.  Contrast these:
>    # -b653eda3ac4864de205419d9f41eec267cb89eeb .gnulib
>    #  b653eda3ac4864de205419d9f41eec267cb89eeb .gnulib (v0.0-2286-gb653eda)
>    # $ cat .git-module-status
>    # b653eda3ac4864de205419d9f41eec267cb89eeb
> +  #
> +  # Keep this logic in sync with autogen.sh.
>    _submodule_hash = sed 's/^[ +-]//;s/ .*//'
>    _update_required := $(shell						\
>        cd '$(srcdir)';							\
>        test -d .git || { echo 0; exit; };				\
>        test -f po/Makevars || { echo 1; exit; };				\
>        test -f AUTHORS || { echo 1; exit; };				\

My local tree isn't in a state that I can conveniently test it right
now, but it looks correct to me. ACK.