Add otp-get-patches.sh

otp-get-patches.sh automatically extracts the patches
from an otp git repo and prepares them for inclusion
into erlang.spec and the Fedora erlang package git repo.

This still requires some manual work, though.

2 files changed, 69 insertions, 0 deletions

diff --git a/erlang.spec b/erlang.spec
index 441cb67..fc2281e 100644
--- a/erlang.spec
+++ b/erlang.spec
@@ -30,6 +30,17 @@ Source2:	http://erlang.org/download/otp_doc_man_%{upstream_ver}%{upstream_rel}.t
 %endif
 # For the source of the Fedora specific patches, see the respective
 # branch at https://github.com/lemenkov/otp
+#
+# Run something like
+#    $ git clone git://github.com/erlang/otp.git
+#    $ cd otp
+#    $ git remote add lemenkov git://github.com/lemenkov/otp.git
+#    $ git fetch -v --all
+# to get yourself a copy of the Erlang/OTP source code with the
+# Fedora specific patches from Peter Lemenkov. Then run
+#    $ ./otp-get-patches.sh /path/to/otp OTP_R14B01 lemenkov/fedora-R14B01
+# for some semi-automatic patch update assistance.
+#
 # Fedora-specific
 Patch1:		otp-0001-Do-not-format-man-pages-and-do-not-install-miscellan.patch
 # Fedora-specific
diff --git a/otp-get-patches.sh b/otp-get-patches.sh
new file mode 100755
index 0000000..076752b
--- /dev/null
+++ b/otp-get-patches.sh
@@ -0,0 +1,58 @@
+#!/bin/bash
+# Usage:
+#    ./otp-get-patches.sh /path/to/otp OTP_R14B01 fedora-R14B01
+#
+# Note:
+#    We do NOT update erlang.spec or the git index at all.
+#    For now, take a look at the patch-list-*.txt files
+#    generated in the tmpdir manually copy and adapt them
+#    to erlang.spec. Then handle the otp-*.patch files:
+#
+#        git rm -f otp-00*.patch
+#        mv tmp.foobar/otp-00*.patch .
+#        git add otp-00*.patch
+#
+#    We could only automate this if we added the required patch
+#    specific spec file conditionals to the commit message somehow,
+#    and then had this script transfer the conditionals into erlang.spec.
+
+otp_dir="${1:?'Fatal: otp git repo dir required'}"
+otp_upstream="${2:?'Fatal: git ref to upstream release required'}"
+otp_fedora="${3:?'Fatal: git ref to branch with fedora patches required'}"
+
+set -e
+# set -x
+
+tmpdir="$(mktemp -d --tmpdir="$PWD")"
+
+pushd "$otp_dir"
+git format-patch -o "$tmpdir" "${otp_upstream}..${otp_fedora}" > "$tmpdir/patch-list.txt"
+popd
+
+test -s "$tmpdir/patch-list.txt"
+
+echo "# start of autogenerated patch tag list" > "$tmpdir/patch-list-tags.txt"
+echo "# start of autogenerated prep patch list" > "$tmpdir/patch-list-prep.txt"
+n=1
+while read patch
+do
+	otppatch="$(dirname "$patch")/otp-$(basename "$patch")"
+	mv -f "$patch" "$otppatch"
+	echo "Patch$n: $(basename "$otppatch")" >> "$tmpdir/patch-list-tags.txt"
+	base="$(basename "$patch" ".patch" | sed 's/^00[0-9][0-9]-//')"
+	backupext=".$(echo -n "$base" | tr -c -s '[:alnum:]' '_')"
+	echo "%patch$n -p1 -b ${backupext}" >> "$tmpdir/patch-list-prep.txt"
+	n=$(($n + 1))
+done < "$tmpdir/patch-list.txt"
+echo "# end of autogenerated patch tag list" >> "$tmpdir/patch-list-tags.txt"
+echo "# end of autogenerated prep patch list" >> "$tmpdir/patch-list-prep.txt"
+
+echo "Results in tmp dir \`$tmpdir':"
+echo
+cat "$tmpdir/patch-list-tags.txt"
+echo
+cat "$tmpdir/patch-list-prep.txt"
+
+echo
+echo "Run \`rm -rf \"$(basename "$tmpdir")\"' when you are finished with the files."
+# End of file.