[Qemu-devel] [PATCH v2] scripts: use git archive in archive-source

[Gerd Hoffmann]

Use git archive to create tarballs of qemu and submodules instead of
cloning the repository and the submodules.  This is a order of magnitude
faster because it doesn't fetch the submodules from the internet each
time the script runs.

Signed-off-by: Gerd Hoffmann <address@hidden>
---

Notes:
    v2: don't run git submodule update (except for uninitialized submodules)

 scripts/archive-source.sh | 58 ++++++++++++++++++-----------------------------
 1 file changed, 22 insertions(+), 36 deletions(-)

diff --git a/scripts/archive-source.sh b/scripts/archive-source.sh
index 6eed2a29bd..b9711059f9 100755
--- a/scripts/archive-source.sh
+++ b/scripts/archive-source.sh
@@ -19,8 +19,7 @@ if test $# -lt 1; then
 fi
 
 tar_file=$(realpath "$1")
-list_file="${tar_file}.list"
-vroot_dir="${tar_file}.vroot"
+sub_file=$(mktemp "${tar_file%.tar}.sub.XXXXXXXX.tar")
 
 # We want a predictable list of submodules for builds, that is
 # independent of what the developer currently has initialized
@@ -28,7 +27,7 @@ vroot_dir="${tar_file}.vroot"
 # different to the host OS.
 submodules="dtc ui/keycodemapdb tests/fp/berkeley-softfloat-3 
tests/fp/berkeley-testfloat-3"
 
-trap "status=$?; rm -rf \"$list_file\" \"$vroot_dir\"; exit \$status" 0 1 2 3 
15
+trap "status=$?; rm -rf \"$sub_file\" ; exit \$status" 0 1 2 3 15
 
 if git diff-index --quiet HEAD -- &>/dev/null
 then
@@ -36,38 +35,25 @@ then
 else
     HEAD=$(git stash create)
 fi
-git clone --shared . "$vroot_dir"
-test $? -ne 0 && error "failed to clone into '$vroot_dir'"
-
-cd "$vroot_dir"
-test $? -ne 0 && error "failed to change into '$vroot_dir'"
-
-git checkout $HEAD
-test $? -ne 0 && error "failed to checkout $HEAD revision"
-
+git archive --format tar $HEAD > "$tar_file"
+test $? -ne 0 && error "failed to archive qemu"
 for sm in $submodules; do
-    git submodule update --init $sm
-    test $? -ne 0 && error "failed to init submodule $sm"
+       status="$(git submodule status "$sm")"
+       smhash="${status# }"
+       smhash="${smhash#+}"
+       smhash="${smhash#-}"
+       smhash="${smhash%% *}"
+       case "$status" in
+           -*)
+               echo "NOTICE: fetching submodule $sm"
+               git submodule update --init "$sm"
+               ;;
+           +*)
+               echo "WARNING: submodule $sm is out of sync"
+               ;;
+       esac
+       (cd $sm; git archive --format tar --prefix "$sm/" $smhash) > "$sub_file"
+       test $? -ne 0 && error "failed to archive submodule $sm ($smhash)"
+       tar --concatenate --file "$tar_file" "$sub_file"
+       test $? -ne 0 && error "failed append submodule $sm to $tar_file"
 done
-
-if test -n "$submodules"; then
-    {
-        git ls-files || error "git ls-files failed"
-        for sm in $submodules; do
-            (cd $sm; git ls-files) | sed "s:^:$sm/:"
-            if test "${PIPESTATUS[*]}" != "0 0"; then
-                error "git ls-files in submodule $sm failed"
-            fi
-        done
-    } | grep -x -v $(for sm in $submodules; do echo "-e $sm"; done) > 
"$list_file"
-else
-    git ls-files > "$list_file"
-fi
-
-if test $? -ne 0; then
-    error "failed to generate list file"
-fi
-
-tar -cf "$tar_file" -T "$list_file" || error "failed to create tar file"
-
-exit 0
-- 
2.9.3