X-Git-Url: https://git.exim.org/exim.git/blobdiff_plain/80fea873648ca2ab2e592999a336c59cf054ab55..de531e70dc0e5aa94cf6fba35afa1cd23c36bf1f:/src/scripts/reversion

diff --git a/src/scripts/reversion b/src/scripts/reversion
index 9707b9c1c..6fd0782a4 100755
--- a/src/scripts/reversion
+++ b/src/scripts/reversion
@@ -1,5 +1,6 @@
 #!/bin/sh
-# Copyright (c) The Exim Maintainers 2016
+# Copyright (c) The Exim Maintainers 1995 - 2021
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 set -e
 LC_ALL=C
@@ -29,62 +30,106 @@ fi
 # Read version information that was generated by a previous run of
 # this script, or during the release process.
 
-if   [ -f ./version.sh ]
-then .    ./version.sh
-elif [ -f ../src/version.sh ]
-then .    ../src/version.sh
+# Override, used for automated testing w/o access to the
+# .git directory (w.g. inside a git worktree)
+if   [ -n "$EXIM_RELEASE_VERSION" ]; then
+    :
+elif   [ -f ./version.sh ]; then
+    .    ./version.sh
+elif [ -f ../src/version.sh ]; then
+    .    ../src/version.sh
+elif [ -d ../../.git ] || [ -f ../../.git ] || [ "$1" = release ]; then
+    # Modify the output of git describe into separate parts for
+    # the name "exim" and the release and variant versions.
+    # Put a dot in the version number and remove a spurious g.
+    if [ "$2" ]
+    then
+        description=$(git describe "$2")
+    else
+        description=$(git describe --dirty=-XX --match 'exim-4*')
+    fi
+    set $(echo "$description" | sed 's/-/ /; s/-g/-/')
+    # Only update if we need to
+    if [ "$2 $3" != "$EXIM_RELEASE_VERSION $EXIM_VARIANT_VERSION" ]
+    then
+            EXIM_RELEASE_VERSION="$2"
+            EXIM_VARIANT_VERSION="$3"
+            rm -f version.h
+    fi
 fi
 
-# If this tree is a git working directory, use that to get version information.
-
-if [ -d ../../.git ] || [ "$1" = "release" ]
-then
-	# Modify the output of git describe into separate parts for
-	# the name "exim" and the release and variant versions.
-	# Put a dot in the version number and remove a spurious g.
-	if [ "$2" ]
-	then
-	    description=$(git describe "$2")
-	else
-	    description=$(git describe --dirty=-XX --match 'exim-4*')
-	fi
-	set $(echo "$description" | sed 's|-| |;s|_|.|;s|[-_]| _|;s|-g|-|')
-	# Only update if we need to
-	if [ "$2 $3" != "$EXIM_RELEASE_VERSION $EXIM_VARIANT_VERSION" ]
-	then
-		EXIM_RELEASE_VERSION="$2"
-		EXIM_VARIANT_VERSION="$3"
-		rm -f version.h
-	fi
+if [ -z "$EXIM_RELEASE_VERSION" ]; then
+    echo "Cannot determine the release number" >&2
+    echo "You may want to override it with EXIM_RELEASE_VERSION" >&2
+    exit 1
 fi
 
 # If you are maintaining a patched version of Exim, you can either
 # create your own version.sh as part of your release process, or you
 # can modify EXIM_VARIANT_VERSION at this point in this script.
 
-case "$EXIM_RELEASE_VERSION" in
-'')	echo "*** Your copy of Exim lacks any version information."
-	exit 1
-esac
+if test -z "$EXIM_RELEASE_VERSION"; then
+    echo "$0: Your copy of Exim lacks any version information." >&2
+    exit 1
+fi
 
 EXIM_COMPILE_NUMBER=$(expr "${EXIM_COMPILE_NUMBER:-0}" + 1)
 
 echo "$EXIM_COMPILE_NUMBER" >cnumber.h
 
+# Reproducible builds, accept a build timestamp override from environ per
+# <https://reproducible-builds.org/specs/source-date-epoch/>.
+# We require a fairly modern date(1) command here, which is not portable
+# to some of the systems Exim is built on.  That's okay, because the scenarios
+# are:
+#  1) Local postmaster building, not using $SOURCE_DATE_EPOCH, doesn't matter
+#  2) Packaging folks who don't care about reproducible builds
+#  3) Packaging folks who care but are using systems where date Just Works
+#  3) Packaging folks who care and can put a modern date(1) in $PATH
+#  4) Packaging folks who care and can supply us with a clean patch to support
+#     their requirements
+#  5) Packaging folks who care but won't do any work to support their strange
+#     old systems and want us to do the work for them.  We don't care either,
+#     they're SOL and have to live without reproducible builds.
+#
+exim_build_date_override=''
+if [ ".${SOURCE_DATE_EPOCH:-}" != "." ]; then
+  fmt='+%d-%b-%Y %H:%M:%S'
+  # Non-reproducible, we use __DATE__ and __TIME__ in C, which respect timezone
+  # (think localtime, not gmtime); for reproduction between systems, UTC makes
+  # more sense and the examples available use UTC without explicitly mandating
+  # it.  I think that we can switch behavior and use UTC for reproducible
+  # builds without it causing any problems: nothing really cares about timezone.
+  # GNU date: "date -d @TS"
+  # BSD date: "date -r TS"
+  exim_build_date_override="$(date -u -d "@${SOURCE_DATE_EPOCH}" "$fmt" 2>/dev/null || date -u -r "${SOURCE_DATE_EPOCH}" "$fmt" 2>/dev/null)"
+fi
+
 ( echo '# automatically generated file - see ../scripts/reversion'
   echo EXIM_RELEASE_VERSION='"'"$EXIM_RELEASE_VERSION"'"'
+  test -n "$EXIM_VARIANT_VERSION" && \
   echo EXIM_VARIANT_VERSION='"'"$EXIM_VARIANT_VERSION"'"'
   echo EXIM_COMPILE_NUMBER='"'"$EXIM_COMPILE_NUMBER"'"'
+  if [ ".${exim_build_date_override:-}" != "." ]; then
+    echo EXIM_BUILD_DATE_OVERRIDE='"'"${exim_build_date_override}"'"'
+  fi
 ) >version.sh
 
 if [ ! -f version.h ]
 then
 ( echo '/* automatically generated file - see ../scripts/reversion */'
   echo '#define EXIM_RELEASE_VERSION "'"$EXIM_RELEASE_VERSION"'"'
+  test -n "$EXIM_VARIANT_VERSION" && \
   echo '#define EXIM_VARIANT_VERSION "'"$EXIM_VARIANT_VERSION"'"'
-  echo '#define EXIM_VERSION_STR EXIM_RELEASE_VERSION EXIM_VARIANT_VERSION'
+  echo '#ifdef EXIM_VARIANT_VERSION'
+  echo '#define EXIM_VERSION_STR EXIM_RELEASE_VERSION "-" EXIM_VARIANT_VERSION'
+  echo '#else'
+  echo '#define EXIM_VERSION_STR EXIM_RELEASE_VERSION'
+  echo '#endif'
+  if [ ".${exim_build_date_override:-}" != "." ]; then
+    echo '#define EXIM_BUILD_DATE_OVERRIDE "'"${exim_build_date_override}"'"'
+  fi
 ) >version.h
 fi
 
-echo ">>> version $EXIM_RELEASE_VERSION$EXIM_VARIANT_VERSION #$EXIM_COMPILE_NUMBER"
-echo
+#test -t 1 && echo ">>> version $EXIM_RELEASE_VERSION $EXIM_VARIANT_VERSION #$EXIM_COMPILE_NUMBER"