Generate distribution.ini using /etc/os-release values

Fix RHEL-61139
Related: RHEL-61819

distribution.ini

@@ -1,9 +0,0 @@
-[Global]
-id=redhat
-version=1.0
-about=Mozilla Firefox for Red Hat Enterprise Linux
-
-[Preferences]
-app.distributor=redhat
-app.distributor.channel=redhat
-app.partner.redhat=redhat

distribution.ini.in

@@ -0,0 +1,9 @@
+[Global]
+id=__ID__
+version=1.0
+about=Mozilla Firefox for __NAME__
+
+[Preferences]
+app.distributor=__ID__
+app.distributor.channel=__ID__
+app.partner.__ID__=__ID__

firefox.spec

@@ -179,7 +179,7 @@ Source21:       firefox.sh.in
 Source23:       firefox.1
 Source24:       mozilla-api-key
 Source25:       firefox-symbolic.svg
-Source26:       distribution.ini
+Source26:       distribution.ini.in
 Source27:       google-api-key
 Source30:       firefox-x11.sh.in
 Source31:       firefox-x11.desktop
@@ -1718,14 +1718,11 @@ ln -s %{_datadir}/myspell %{buildroot}%{mozappdir}/dictionaries
 
 # Add distribution.ini
 %{__mkdir_p} %{buildroot}%{mozappdir}/distribution
-%{__cp} %{SOURCE26} %{buildroot}%{mozappdir}/distribution
-
-# CentOS
-%if 0%{?centos}
-%{__sed} -i -e 's/redhat/centos/g' %{buildroot}%{mozappdir}/distribution/distribution.ini
-(source  /etc/os-release; %{__sed} -i -e 's/Red Hat Enterprise Linux/$NAME/' %{buildroot}%{mozappdir}/distribution/distribution.ini)
-cat %{buildroot}%{mozappdir}/distribution/distribution.ini
-%endif
+%{__sed} -e "s/__NAME__/%(source /etc/os-release; echo ${NAME})/g" \
+         -e "s/__ID__/%(source /etc/os-release; echo ${ID})/g" \
+         -e "s/rhel/redhat/g" \
+         -e "s/Fedora.*/Fedora/g" \
+         %{SOURCE26} > %{buildroot}%{mozappdir}/distribution/distribution.ini
 
 # Install appdata file
 mkdir -p %{buildroot}%{_datadir}/metainfo