[ptxdist] [PATCH v4 2/2] Detect changes in package patch series

[jon@ringle.org]

From: Jon Ringle <jringle@gridpoint.com>

For a long time it has bothered me that if a package's patches were changed
ptxdist would not detect this change and I would often have old versions of
*-dev.tar.gz packages that got used because the packages patches were
updated.

This commit solves this problem.

Here's how it works:
1) In the package rule makefile add `${PKG}_SERIES_SHA256 :=`
2) extract the package. libfaketime is used to keep the committer timestamp
   to a fixed timestamp in order to keep the git SHA1 tree repeatable.
3) from the packages src dir do `git ptx-patches`
   This will populate the rule makefile _SERIES_SHA256 value
4) Anytime you make a patch change to a package and do `git ptx-patches`
   the series file gets updated with the `git rev-parse HEAD` value which
   causes the series file to have a new sha256 value and therefore a new
   value gets populated in the rule makefile, which then causes the package
   to be rebuilt and the *-dev.tar.gz package will have a different cfghash
   in the filename

Signed-off-by: Jon Ringle <jringle@gridpoint.com>
---
 scripts/git-ptx-patches                | 38 +++++++++++++++++++++++++++-------
 scripts/lib/ptxd_make_world_patchin.sh | 28 ++++++++++++++++++++++++-
 2 files changed, 57 insertions(+), 9 deletions(-)

diff --git a/scripts/git-ptx-patches b/scripts/git-ptx-patches
index f2568f9..d37c936 100755
--- a/scripts/git-ptx-patches
+++ b/scripts/git-ptx-patches
@@ -2,9 +2,31 @@
 
 PTX_PATCHES_HEADER="# generated by git-ptx-patches"
 
-function _md5sum() {
-	local sum=$(md5sum)
-	echo "# $sum git-ptx-patches magic"
+function _gitsha1sum() {
+	local sha1=$(git rev-parse HEAD)
+	echo "# $sha1 git-ptx-patches magic"
+}
+
+update_series_sha256() {
+	local makefile="$(readlink -f .ptxdist/rule.make)"
+	source .ptxdist/rule.env
+	set -- $(sha256sum .ptxdist/series)
+	local sha256="${1}"
+
+	local count=$(grep "^${PKG}_SERIES_SHA256[	 ]*:=" "${makefile}" 2> /dev/null | wc -l)
+	if [ "${count}" -gt 1 ]; then
+		echo "Error: Could not update patch series sha256sum for '${pkg_label}': ${PKG}_SERIES_SHA256 found ${count} times in '${makefile}'."
+		exit 1
+	fi
+	local current_sha256=$(grep "^${PKG}_SERIES_SHA256[	 ]*:= " "${makefile}" |cut -f2 -d=|xargs)
+	if [ "${current_sha256}" != "${sha256}" ]; then
+		sed -i "s/^\(\<${PKG}_SERIES_SHA256[	]*:=\) *[a-f0-9]*\$/\1 ${sha256}/" "${makefile}"
+		if ! grep -q "${sha256}\$" "${makefile}"; then
+			echo "Warning: ${PKG}_SERIES_SHA256 is missing from '${makefile}'."
+		else
+			echo "New patch series checksum for '${pkg_label}': ${sha256} in '${makefile}'."
+		fi
+	fi
 }
 
 if [ ! -L .ptxdist/patches ]; then
@@ -22,10 +44,8 @@ tag=base
 
 if grep -q "$PTX_PATCHES_HEADER" .ptxdist/series; then
 	echo "Found series file generated by git-ptx-patches."
-	lines=$(wc -l < .ptxdist/series)
-	lines=$[lines-1]
-	magic=$(head -n$lines .ptxdist/series | _md5sum)
-	if grep -q "^$magic" .ptxdist/series; then
+	magic=$(git rev-parse HEAD)
+	if grep -q "^# $magic" .ptxdist/series; then
 		remove_old=yes
 	else
 		echo "Warning: .ptxdist/series was modified."
@@ -132,7 +152,9 @@ cat .ptxdist/series.0 > .ptxdist/series
 git format-patch -M -N $GIT_EXTRA_ARGS ${tagopt} -o .ptxdist/patches/ ${range} | sed -e 's,^.ptxdist/patches/,,' > .ptxdist/series.auto
 cat .ptxdist/series.auto >> .ptxdist/series
 cat .ptxdist/series.1 >> .ptxdist/series
-cat .ptxdist/series | _md5sum >> .ptxdist/series
+cat .ptxdist/series | _gitsha1sum >> .ptxdist/series
+
+update_series_sha256
 
 # The first line of the patch is 'From <some-git-hash> ...'
 # remove it to avoid unnecessary changes in the patch files.
diff --git a/scripts/lib/ptxd_make_world_patchin.sh b/scripts/lib/ptxd_make_world_patchin.sh
index e57da64..cb31244 100644
--- a/scripts/lib/ptxd_make_world_patchin.sh
+++ b/scripts/lib/ptxd_make_world_patchin.sh
@@ -221,6 +221,8 @@ ptxd_make_world_patchin_apply()
 	pkg_patch_series \
 	pkg_patch_tool
 
+    local PKG="$(ptxd_name_to_NAME "${pkg_label}")"
+
     if [[ "${pkg_url}" =~ ^file:// ]]; then
 	local url="$(ptxd_file_url_path "${pkg_url}")"
 	# local directories are not intended to be patched
@@ -255,6 +257,16 @@ ptxd_make_world_patchin_apply()
     mkdir "${pkg_patchin_dir}/.ptxdist" &&
 
     #
+    # create a ".ptxdist/rule.make" link pointing to the packages rule makefile
+    #
+    ln -s "${pkg_makefile}" "${pkg_patchin_dir}/.ptxdist/rule.make" &&
+    (
+	cat <<-EOF
+	PKG=${PKG}
+	pkg_label=${pkg_label}
+	EOF
+    ) > "${pkg_patchin_dir}/.ptxdist/rule.env" &&
+    #
     # create a ".ptxdist/patches" link pointing to the directory
     # containing the patches
     #
@@ -341,6 +353,7 @@ ptxd_make_world_patchin_apply()
     echo
     echo "pkg_patch_dir:     '$(ptxd_print_path "${pkg_patch_dir:-<none>}")'"
     echo "pkg_patch_series:  '$(ptxd_print_path "${pkg_patch_series:-<none>}")'"
+    echo "pkg_makefile:    '$(ptxd_print_path "${pkg_makefile:-<none>}")'"
     echo
 
     # apply patches if series file is available
@@ -437,6 +450,7 @@ export -f ptxd_make_world_autogen
 # pkg_patchin_dir	where to apply the patches
 # pkg_patch_dir		path to dir that contains the patches
 #			empty if no patches should be applied
+# pkg_makefile		the package's rule makefile
 #
 ptxd_make_world_patchin_init()
 {
@@ -463,6 +477,14 @@ ptxd_make_world_patchin_init()
 	return
     fi
     pkg_patch_dir="${ptxd_reply}"
+
+    #
+    # find rules make
+    #
+    if ! ptxd_find_pkg_makefile "${pkg_label}" ; then
+	return
+    fi
+    pkg_makefile="$(readlink -f "${ptxd_reply}")"
 }
 export -f ptxd_make_world_patchin_init
 
@@ -471,8 +493,12 @@ ptxd_make_world_patchin()
     ptxd_make_world_patchin_init || return
 
     if [ -n "${pkg_patch_dir}" ]; then (
+	local libfaketime="${PTXDIST_TOPDIR}/scripts/libfaketime/libfaketime.so.1"
 	cd "${pkg_patchin_dir}" &&
-	ptxd_make_world_patchin_apply
+	( LD_PRELOAD="${libfaketime}" \
+	  FAKETIME="2002-01-15 13:30:00" \
+	  ptxd_make_world_patchin_apply
+	)
      ) else
 	echo -e "patchin: no patches found"
     fi
-- 
1.9.1


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