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#!/bin/bash
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# Usage:
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# ./otp-get-patches.sh /path/to/otp OTP_R14B02 fedora-R14B02
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#
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# otp-get-patches.sh - update erlang.spec and otp-00*.patch files
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#
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# otp-get-patches.sh updates the erlang.spec and otp-00*.patch
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# files in the git index. After an otp-get-patches.sh run, you
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# will need to review the stage git changes, possibly adapt the
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# Release: and %changelog parts of erlang spec, and can then
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# "git commit" everything.
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#
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# Caution: Leave the four special comment lines untouched in the
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# spec file, as otp-get-patches.sh requires them and will only
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# touch erlang.spec between the respective start/end pair:
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#
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# # start of autogenerated patch tag list
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# # end of autogenerated patch tag list
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# # start of autogenerated prep patch list
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# # end of autogenerated prep patch list
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#
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# The following special comment lines in the git commit messages
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# will be interpreted:
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#
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# Fedora-Spec-Comment: This patch only applies to EL6 builds
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# Fedora-Spec-Before: %if 0%?el6}
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# Fedora-Spec-After: %endif
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#
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# If there is no "Fedora-Spec-Comment:" line, we will use
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# "Fedora specific patch".
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# Command line parsing
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otp_dir="${1:?'Fatal: otp git repo dir required'}"
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otp_upstream="${2:?'Fatal: git ref to upstream release required'}"
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otp_fedora="${3:?'Fatal: git ref to branch with fedora patches required'}"
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# Setup
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set -e
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# set -x
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tmpdir="$(mktemp -d --tmpdir="$PWD")"
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# Generate patch files
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pushd "$otp_dir"
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git format-patch -N -o "$tmpdir" "${otp_upstream}..${otp_fedora}" > "$tmpdir/patch-list.txt"
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popd
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test -s "$tmpdir/patch-list.txt"
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# Process patch files
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echo "# start of autogenerated patch tag list" > "$tmpdir/patch-list-tags.txt"
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echo "# start of autogenerated prep patch list" > "$tmpdir/patch-list-prep.txt"
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n=1
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while read patch
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do
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otppatch="$(dirname "$patch")/otp-$(basename "$patch")"
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${SED-sed} -e '1d' -e '/^-- $/,$d' "$patch" > "$otppatch"
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rm -f "$patch"
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comment="$(sed -n 's/^Fedora-Spec-Comment:\s*//p' "$otppatch")"
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if test "x$comment" = "x"; then comment="Fedora specific patch"; fi
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echo "# ${comment}" >> "$tmpdir/patch-list-tags.txt"
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echo "# $(sed -n 's/^Subject: \[PATCH\] //p' "$otppatch")" >> "$tmpdir/patch-list-tags.txt"
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echo "Patch$n: $(basename "$otppatch")" >> "$tmpdir/patch-list-tags.txt"
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base="$(basename "$patch" ".patch" | sed 's/^00[0-9][0-9]-//')"
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backupext=".$(echo -n "$base" | tr -c -s '[:alnum:]' '_')"
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sed -n 's/^Fedora-Spec-Before:\s*//p' "$otppatch" >> "$tmpdir/patch-list-prep.txt"
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echo "%patch$n -p1 -b ${backupext}" >> "$tmpdir/patch-list-prep.txt"
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sed -n 's/^Fedora-Spec-After:\s*//p' "$otppatch" >> "$tmpdir/patch-list-prep.txt"
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n=$(($n + 1))
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done < "$tmpdir/patch-list.txt"
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echo "# end of autogenerated patch tag list" >> "$tmpdir/patch-list-tags.txt"
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echo "# end of autogenerated prep patch list" >> "$tmpdir/patch-list-prep.txt"
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# Create updated spec file
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specfile="erlang.spec"
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newspec1="${tmpdir}/${specfile}.new1"
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newspec2="${tmpdir}/${specfile}.new2"
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sed '/^# start of autogenerated patch tag list$/,$d' "$specfile" > "$newspec1"
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cat "$tmpdir/patch-list-tags.txt" >> "$newspec1"
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sed '1,/^# end of autogenerated patch tag list/d' "$specfile" >> "$newspec1"
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sed '/^# start of autogenerated prep patch list$/,$d' "$newspec1" > "$newspec2"
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cat "$tmpdir/patch-list-prep.txt" >> "$newspec2"
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sed '1,/^# end of autogenerated prep patch list/d' "$newspec1" >> "$newspec2"
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# Actually put all changes into git index
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git rm -f otp-00*.patch
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mv "$tmpdir/otp-00"*.patch .
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git add otp-00*.patch
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mv -f "$newspec2" "$specfile"
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git add "$specfile"
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rm -rf "$tmpdir"
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# End of file.
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