os_release: fix ISO parsing for 'Fedora-IoT' composes
Also comment this better. We need to index from the end of the string here, not the start, because going from the start breaks when the compose shortname has a dash in it. Signed-off-by: Adam Williamson <awilliam@redhat.com>
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@ -34,10 +34,19 @@ sub run {
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# correct variables to compare the system data with.
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# First, we know the basic stuff
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my $id = get_var("DISTRI"); # Should be "fedora"
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my $isovar = get_var("ISO"); # Takes the build string for canned variants.
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# Split the ISO variable at "-" and read fields 4 (release version)
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# and 5 (the build number).
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my ($cannedver, $cannednum) = (split /-/, $isovar)[4, 5];
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# extract expected version components from ISO name for canned variants,
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# which have their os-release rewritten by rpm-ostree, see:
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# https://github.com/projectatomic/rpm-ostree/blob/master/docs/manual/treefile.md
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# we use the ISO name because rpm-ostree uses elements from the compose
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# ID for nightlies, but from the label for candidate composes; BUILD
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# always gives us the compose ID, but the ISO name contains the compose
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# ID for nightlies but the label for candidate composes, so it works for
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# our purposes here.
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my $isovar = get_var("ISO");
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# Split the ISO variable at "-" and read second-to-last (release
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# number) and last (compose ID: date and respin, label: major and
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# minor) fields.
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my ($cannedver, $cannednum) = (split /-/, $isovar)[-2, -1];
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# Get rid of the ".iso" part of the tag.
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$cannednum =~ s/\.iso//g;
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# Now, we merge the fields into one expression to create the correct canned tag
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@ -77,10 +86,8 @@ sub run {
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}
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my $version = "$version_id ($varstr)";
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# Version looks different when the build is canned (because
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# rpm-ostree fiddles around with it, documented at
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# https://github.com/projectatomic/rpm-ostree/blob/master/docs/manual/treefile.md )
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# We need to form a different string here by using the above created cannedtag.
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# for canned variants, we need to form a different string here by using
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# the above created cannedtag. See earlier comment
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if (get_var("CANNED")) {
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$version = "$cannedtag ($varstr)";
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}
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