gitian: Limit sourced script to just assignments

Previously, the sourced script would create the source tarball. Now, it
only assigns variables and the source-ing script has more flexibility in
determining what to do with these variables.

See later commit showing how this flexibility is useful in our Guix
builds.

5 files changed, 39 insertions, 29 deletions

diff --git a/contrib/gitian-descriptors/assign_DISTNAME b/contrib/gitian-descriptors/assign_DISTNAME
new file mode 100755
index 0000000000..a1ab3f7cbd
--- /dev/null
+++ b/contrib/gitian-descriptors/assign_DISTNAME
@@ -0,0 +1,12 @@
+# Copyright (c) 2020 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+#
+# A helper script to be sourced into the gitian descriptors
+
+if RECENT_TAG="$(git describe --exact-match HEAD)"; then
+    VERSION="${RECENT_TAG#v}"
+else
+    VERSION="$(git rev-parse --short HEAD)"
+fi
+DISTNAME="bitcoin-${VERSION}"
diff --git a/contrib/gitian-descriptors/gitian-linux.yml b/contrib/gitian-descriptors/gitian-linux.yml
index f421372e10..0ed1e16f7e 100644
--- a/contrib/gitian-descriptors/gitian-linux.yml
+++ b/contrib/gitian-descriptors/gitian-linux.yml
@@ -140,9 +140,15 @@ script: |
   create_per-host_faketime_wrappers "${REFERENCE_DATETIME}"
   export PATH=${WRAP_DIR}:${PATH}
 
-  # Create the git archive, and define DISTNAME and GIT_ARCHIVE variables.
-  # shellcheck source=contrib/gitian-descriptors/make_git_archive
-  source contrib/gitian-descriptors/make_git_archive
+  # Define DISTNAME variable.
+  # shellcheck source=contrib/gitian-descriptors/assign_DISTNAME
+  source contrib/gitian-descriptors/assign_DISTNAME
+
+  GIT_ARCHIVE="${OUTDIR}/src/${DISTNAME}.tar.gz"
+
+  # Create the source tarball
+  mkdir -p "$(dirname "$GIT_ARCHIVE")"
+  git archive --output="$GIT_ARCHIVE" HEAD
 
   ORIGPATH="$PATH"
   # Extract the git archive into a dir for each host and build
diff --git a/contrib/gitian-descriptors/gitian-osx.yml b/contrib/gitian-descriptors/gitian-osx.yml
index 82f8f194fc..bbae7201e5 100644
--- a/contrib/gitian-descriptors/gitian-osx.yml
+++ b/contrib/gitian-descriptors/gitian-osx.yml
@@ -103,9 +103,15 @@ script: |
   create_per-host_faketime_wrappers "${REFERENCE_DATETIME}"
   export PATH=${WRAP_DIR}:${PATH}
 
-  # Create the git archive, and define DISTNAME and GIT_ARCHIVE variables.
-  # shellcheck source=contrib/gitian-descriptors/make_git_archive
-  source contrib/gitian-descriptors/make_git_archive
+  # Define DISTNAME variable.
+  # shellcheck source=contrib/gitian-descriptors/assign_DISTNAME
+  source contrib/gitian-descriptors/assign_DISTNAME
+
+  GIT_ARCHIVE="${OUTDIR}/src/${DISTNAME}.tar.gz"
+
+  # Create the source tarball
+  mkdir -p "$(dirname "$GIT_ARCHIVE")"
+  git archive --output="$GIT_ARCHIVE" HEAD
 
   ORIGPATH="$PATH"
   # Extract the git archive into a dir for each host and build
diff --git a/contrib/gitian-descriptors/gitian-win.yml b/contrib/gitian-descriptors/gitian-win.yml
index 54ad68a2a3..adad7c32d1 100644
--- a/contrib/gitian-descriptors/gitian-win.yml
+++ b/contrib/gitian-descriptors/gitian-win.yml
@@ -108,9 +108,15 @@ script: |
   create_per-host_compiler_wrapper "${REFERENCE_DATETIME}"
   export PATH=${WRAP_DIR}:${PATH}
 
-  # Create the git archive, and define DISTNAME and GIT_ARCHIVE variables.
-  # shellcheck source=contrib/gitian-descriptors/make_git_archive
-  source contrib/gitian-descriptors/make_git_archive
+  # Define DISTNAME variable.
+  # shellcheck source=contrib/gitian-descriptors/assign_DISTNAME
+  source contrib/gitian-descriptors/assign_DISTNAME
+
+  GIT_ARCHIVE="${OUTDIR}/src/${DISTNAME}.tar.gz"
+
+  # Create the source tarball
+  mkdir -p "$(dirname "$GIT_ARCHIVE")"
+  git archive --output="$GIT_ARCHIVE" HEAD
 
   ORIGPATH="$PATH"
   # Extract the git archive into a dir for each host and build
diff --git a/contrib/gitian-descriptors/make_git_archive b/contrib/gitian-descriptors/make_git_archive
deleted file mode 100755
index d922c94c60..0000000000
--- a/contrib/gitian-descriptors/make_git_archive
+++ /dev/null
@@ -1,20 +0,0 @@
-# Copyright (c) 2020 The Bitcoin Core developers
-# Distributed under the MIT software license, see the accompanying
-# file COPYING or http://www.opensource.org/licenses/mit-license.php.
-#
-# A helper script to be sourced into the gitian descriptors
-
-mkdir -p ${OUTDIR}/src
-RECENT_TAG=$(git describe --abbrev=0 HEAD)
-if [ $RECENT_TAG = $(git describe HEAD) ]; then
-  if [[ $RECENT_TAG == v* ]]; then
-    VERSION=${RECENT_TAG:1}
-  else
-    VERSION=$RECENT_TAG
-  fi
-else
-  VERSION=$(git rev-parse --short HEAD)
-fi
-DISTNAME=bitcoin-${VERSION}
-GIT_ARCHIVE="${OUTDIR}/src/${DISTNAME}.tar.gz"
-git archive --output=$GIT_ARCHIVE HEAD