installer/v3.sh: make source.list URL overriding possible

This is for the purposes of automated testing of non-mainline package
builds.

installer/v3.sh

@@ -19,7 +19,8 @@ bionic_install()
     apt update
     apt -y install gpg python3-distutils wget
     wget -q https://dl.bluecherrydvr.com/key/bluecherry.asc -O- | apt-key add -
-    wget --output-document=/etc/apt/sources.list.d/bluecherry-"$VERSION_CODENAME".list https://dl.bluecherrydvr.com/sources.list.d/bluecherry-"$VERSION_CODENAME"-unstable.list
+    : "${SRCLIST_URL:=https://dl.bluecherrydvr.com/sources.list.d/bluecherry-"$VERSION_CODENAME"-unstable.list}"
+    wget --output-document=/etc/apt/sources.list.d/bluecherry-"$VERSION_CODENAME".list "$SRCLIST_URL"
     apt -y update
     apt -y install bluecherry
     systemctl restart bluecherry
@@ -39,7 +40,8 @@ focal_install()
 #    pip install pyopenssl --upgrade
     pip3 install pyOpenSSL --upgrade
     wget -q https://dl.bluecherrydvr.com/key/bluecherry.asc -O- | apt-key add -
-    wget --output-document=/etc/apt/sources.list.d/bluecherry-"$VERSION_CODENAME".list https://dl.bluecherrydvr.com/sources.list.d/bluecherry-"$VERSION_CODENAME"-unstable.list
+    : "${SRCLIST_URL:=https://dl.bluecherrydvr.com/sources.list.d/bluecherry-"$VERSION_CODENAME"-unstable.list}"
+    wget --output-document=/etc/apt/sources.list.d/bluecherry-"$VERSION_CODENAME".list "$SRCLIST_URL"
     apt -y update
 #    apt -y install mariadb-server-10.3 
     apt -y install bluecherry
@@ -51,7 +53,8 @@ groovy_install()
 {
     apt -y install gpg wget
     wget -q https://dl.bluecherrydvr.com/key/bluecherry.asc -O- | apt-key add -
-    wget --output-document=/etc/apt/sources.list.d/bluecherry-"$VERSION_CODENAME".list https://dl.bluecherrydvr.com/sources.list.d/bluecherry-"$VERSION_CODENAME"-unstable.list
+    : "${SRCLIST_URL:=https://dl.bluecherrydvr.com/sources.list.d/bluecherry-"$VERSION_CODENAME"-unstable.list}"
+    wget --output-document=/etc/apt/sources.list.d/bluecherry-"$VERSION_CODENAME".list "$SRCLIST_URL"
     apt -y update
     apt -y install mariadb-server bluecherry
     systemctl restart bluecherry
@@ -62,7 +65,8 @@ hirsute_install()
 {
     apt -y install gpg wget
     wget -q https://dl.bluecherrydvr.com/key/bluecherry.asc -O- | apt-key add -
-    wget --output-document=/etc/apt/sources.list.d/bluecherry-"$VERSION_CODENAME".list https://dl.bluecherrydvr.com/sources.list.d/bluecherry-"$VERSION_CODENAME"-unstable.list
+    : "${SRCLIST_URL:=https://dl.bluecherrydvr.com/sources.list.d/bluecherry-"$VERSION_CODENAME"-unstable.list}"
+    wget --output-document=/etc/apt/sources.list.d/bluecherry-"$VERSION_CODENAME".list "$SRCLIST_URL"
     apt -y update
     apt -y install mariadb-server bluecherry
     systemctl restart bluecherry
@@ -77,7 +81,8 @@ jammy_install()
 #    wget -q https://dl.bluecherrydvr.com/key/bluecherry.asc -O- | apt-key add -
     wget -q https://dl.bluecherrydvr.com/key/bluecherry.asc -O- | sudo tee /etc/apt/trusted.gpg.d/bluecherry.asc
     VERSION_CODENAME=jammy # don't say "vera" for Linux Mint at this point
-    wget --output-document=/etc/apt/sources.list.d/bluecherry-"$VERSION_CODENAME".list https://dl.bluecherrydvr.com/sources.list.d/bluecherry-"$VERSION_CODENAME"-unstable.list
+    : "${SRCLIST_URL:=https://dl.bluecherrydvr.com/sources.list.d/bluecherry-"$VERSION_CODENAME"-unstable.list}"
+    wget --output-document=/etc/apt/sources.list.d/bluecherry-"$VERSION_CODENAME".list "$SRCLIST_URL"
     add-apt-repository ppa:ondrej/php -y
     apt -y update
     apt -y install php7.4-fpm php7.4-sqlite3 php7.4-curl php7.4-mysql php7.4-gd php-mail php-mail-mime php-mysql php7.4-fpm php7.4-mysql
@@ -110,7 +115,8 @@ buster_install()
     pip3 install --user --upgrade pip
     wget -q https://repo.mysql.com/RPM-GPG-KEY-mysql-2023 -O- | apt-key add -
     wget -q https://dl.bluecherrydvr.com/key/bluecherry.asc -O- | apt-key add -
-    wget --output-document=/etc/apt/sources.list.d/bluecherry-"$VERSION_CODENAME".list https://dl.bluecherrydvr.com/sources.list.d/bluecherry-"$VERSION_CODENAME"-unstable.list
+    : "${SRCLIST_URL:=https://dl.bluecherrydvr.com/sources.list.d/bluecherry-"$VERSION_CODENAME"-unstable.list}"
+    wget --output-document=/etc/apt/sources.list.d/bluecherry-"$VERSION_CODENAME".list "$SRCLIST_URL"
     apt-get -y update
     apt-get -y install mysql-server bluecherry
 }
@@ -122,7 +128,8 @@ bullseye_install()
     apt-get -y install gnupg sudo sudo python3-distutils wget
     wget -q https://repo.mysql.com/RPM-GPG-KEY-mysql-2023 -O- | apt-key add -
     wget -q https://dl.bluecherrydvr.com/key/bluecherry.asc -O- | apt-key add -
-    wget --output-document=/etc/apt/sources.list.d/bluecherry-"$VERSION_CODENAME".list https://dl.bluecherrydvr.com/sources.list.d/bluecherry-"$VERSION_CODENAME"-unstable.list
+    : "${SRCLIST_URL:=https://dl.bluecherrydvr.com/sources.list.d/bluecherry-"$VERSION_CODENAME"-unstable.list}"
+    wget --output-document=/etc/apt/sources.list.d/bluecherry-"$VERSION_CODENAME".list "$SRCLIST_URL"
     apt-get -y update
     apt-get -y install mariadb-server bluecherry
 #   apt-get install mariadb-server