void-packages/common/environment/setup/git.sh

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# If XBPS_USE_BUILD_MTIME is enabled in conf file don't continue.
# only run this, if SOURCE_DATE_EPOCH isn't set.
if [ -n "$XBPS_USE_BUILD_MTIME" ]; then
unset SOURCE_DATE_EPOCH
return 0
fi
if [ -z "${SOURCE_DATE_EPOCH}" -a -n "$IN_CHROOT" ]; then
if command -v chroot-git &>/dev/null; then
GIT_CMD=$(command -v chroot-git)
elif command -v git &>/dev/null; then
GIT_CMD=$(command -v git)
fi
# check if the template is under version control:
if $GIT_CMD -C ${XBPS_SRCPKGDIR}/${basepkg} status -u normal --porcelain template | grep "^?? " &> /dev/null; then
export SOURCE_DATE_EPOCH="$(stat -c %Y ${XBPS_SRCPKGDIR}/${basepkg}/template)"
else
export SOURCE_DATE_EPOCH="$($GIT_CMD -C ${XBPS_SRCPKGDIR}/${basepkg} log --pretty='%ct' -n1 .)"
fi
fi