[erlang] Add otp-get-patches.sh

[Hans Ulrich Niedermann]

commit 757e49bf92e2ea10c3c7a3df7d35dd255d4dd5d4
Author: Hans Ulrich Niedermann <hun at n-dimensional.de>
Date:   Wed Dec 15 16:51:07 2010 +0100

    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.

 erlang.spec        |   11 +++++++++
 otp-get-patches.sh |   58 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 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.