Merge bitcoin#18945: build: Ensure source tarball has leading directo…

…ry name (0.20)

59d57f6 build: Ensure source tarball has leading directory name (Luke Dashjr)

Pull request description:

  In the interest of moving 0.20.0 forward and being able to do rc2, extract and backport the non-controversial part from bitcoin#18818.: ensure that the source tarball has leading directory name.

ACKs for top commit:
  Sjors:
    tACK 59d57f6
  hebasto:
    ACK 59d57f6.

Tree-SHA512: 6562f4cd631d2ca3c331a05d028a3c46289a7e146319b8718f96b766f952e3b831d05e249ebcc1b27f5b91a6f318a5fdd86d07b2a80ce792d4b1b032e982ed6a

contrib/gitian-descriptors/gitian-linux.yml

@@ -191,4 +191,4 @@ script: |
   done
 
   mkdir -p ${OUTDIR}/src
-  git archive --output=${OUTDIR}/src/${DISTNAME}.tar.gz HEAD
+  git archive --prefix="${DISTNAME}/" --output=${OUTDIR}/src/${DISTNAME}.tar.gz HEAD

contrib/gitian-descriptors/gitian-osx.yml

@@ -161,6 +161,6 @@ script: |
   done
 
   mkdir -p ${OUTDIR}/src
-  git archive --output=${OUTDIR}/src/${DISTNAME}.tar.gz HEAD
+  git archive --prefix="${DISTNAME}/" --output=${OUTDIR}/src/${DISTNAME}.tar.gz HEAD
 
   mv ${OUTDIR}/${DISTNAME}-x86_64-*.tar.gz ${OUTDIR}/${DISTNAME}-osx64.tar.gz

contrib/gitian-descriptors/gitian-win.yml

@@ -157,7 +157,7 @@ script: |
   done
 
   mkdir -p ${OUTDIR}/src
-  git archive --output=${OUTDIR}/src/${DISTNAME}.tar.gz HEAD
+  git archive --prefix="${DISTNAME}/" --output=${OUTDIR}/src/${DISTNAME}.tar.gz HEAD
 
   cp -rf contrib/windeploy $BUILD_DIR
   cd $BUILD_DIR/windeploy