gitian: Use the new bitcoin-detached-sigs git repo for OSX signatures

Rather than fetching a signature.tar.gz from somewhere on the net, instruct
Gitian to use a signature from a tag in the bitcoin-detached-sigs repository
which corresponds to the tag of the release being built.

This changes detached-sig-apply.sh to take a dirname rather than a tarball as
an argument, though detached-sig-create.sh still outputs a tarball for
convenience.

contrib/gitian-descriptors/gitian-osx-signer.yml

@@ -8,10 +8,11 @@ packages:
 - "libc6:i386"
 - "faketime"
 reference_datetime: "2015-06-01 00:00:00"
-remotes: []
+remotes:
+- "url": "https://github.com/bitcoin/bitcoin-detached-sigs.git"
+  "dir": "signature"
 files:
 - "bitcoin-osx-unsigned.tar.gz"
-- "signature.tar.gz"
 script: |
   WRAP_DIR=$HOME/wrapped
   mkdir -p ${WRAP_DIR}
@@ -32,6 +33,6 @@ script: |
   SIGNED=bitcoin-osx-signed.dmg
 
   tar -xf ${UNSIGNED}
-  ./detached-sig-apply.sh ${UNSIGNED} signature.tar.gz
+  ./detached-sig-apply.sh ${UNSIGNED} signature/osx
   ${WRAP_DIR}/genisoimage -no-cache-inodes -D -l -probe -V "Bitcoin-Core" -no-pad -r -apple -o uncompressed.dmg signed-app
   ${WRAP_DIR}/dmg dmg uncompressed.dmg ${OUTDIR}/${SIGNED}

contrib/macdeploy/detached-sig-apply.sh

@@ -20,7 +20,7 @@ fi
 
 rm -rf ${TEMPDIR} && mkdir -p ${TEMPDIR}
 tar -C ${TEMPDIR} -xf ${UNSIGNED}
-tar -C ${TEMPDIR} -xf ${SIGNATURE}
+cp -rf "${SIGNATURE}"/* ${TEMPDIR}
 
 if [ -z "${PAGESTUFF}" ]; then
   PAGESTUFF=${TEMPDIR}/pagestuff

contrib/macdeploy/detached-sig-create.sh

@@ -7,6 +7,7 @@ CODESIGN=codesign
 TEMPDIR=sign.temp
 TEMPLIST=${TEMPDIR}/signatures.txt
 OUT=signature.tar.gz
+OUTROOT=osx
 
 if [ ! -n "$1" ]; then
   echo "usage: $0 <codesign args>"
@@ -23,7 +24,7 @@ grep -v CodeResources < "${TEMPLIST}" | while read i; do
   TARGETFILE="${BUNDLE}/`echo "${i}" | sed "s|.*${BUNDLE}/||"`"
   SIZE=`pagestuff "$i" -p | tail -2 | grep size | sed 's/[^0-9]*//g'`
   OFFSET=`pagestuff "$i" -p | tail -2 | grep offset | sed 's/[^0-9]*//g'`
-  SIGNFILE="${TEMPDIR}/${TARGETFILE}.sign"
+  SIGNFILE="${TEMPDIR}/${OUTROOT}/${TARGETFILE}.sign"
   DIRNAME="`dirname "${SIGNFILE}"`"
   mkdir -p "${DIRNAME}"
   echo "Adding detached signature for: ${TARGETFILE}. Size: ${SIZE}. Offset: ${OFFSET}"
@@ -32,7 +33,7 @@ done
 
 grep CodeResources < "${TEMPLIST}" | while read i; do
   TARGETFILE="${BUNDLE}/`echo "${i}" | sed "s|.*${BUNDLE}/||"`"
-  RESOURCE="${TEMPDIR}/${TARGETFILE}"
+  RESOURCE="${TEMPDIR}/${OUTROOT}/${TARGETFILE}"
   DIRNAME="`dirname "${RESOURCE}"`"
   mkdir -p "${DIRNAME}"
   echo "Adding resource for: "${TARGETFILE}""

doc/release-process.md

@@ -92,15 +92,13 @@ Commit your signature to gitian.sigs:
 	popd
 
   Wait for OSX detached signature:
-	Once the OSX build has 3 matching signatures, Gavin will sign it with the apple App-Store key.
-	He will then upload a detached signature to be combined with the unsigned app to create a signed binary.
+	Once the OSX build has 3 matching signatures, it will be signed with the Apple App-Store key.
+	A detached signature will then be committed to the bitcoin-detached-sigs repository, which can be combined with the unsigned app to create a signed binary.
 
   Create the signed OSX binary:
 
 	pushd ./gitian-builder
-	# Fetch the signature as instructed by Gavin
-	cp signature.tar.gz inputs/
-	./bin/gbuild -i ../bitcoin/contrib/gitian-descriptors/gitian-osx-signer.yml
+	./bin/gbuild -i --commit signature=v${VERSION} ../bitcoin/contrib/gitian-descriptors/gitian-osx-signer.yml
 	./bin/gsign --signer $SIGNER --release ${VERSION}-osx-signed --destination ../gitian.sigs/ ../bitcoin/contrib/gitian-descriptors/gitian-osx-signer.yml
 	mv build/out/bitcoin-osx-signed.dmg ../bitcoin-${VERSION}-osx.dmg
 	popd