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40 lines
1.7 KiB
Text
40 lines
1.7 KiB
Text
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pkg
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ELF (AND MAYBE JAR) DEPENDENCY HANDLING
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ELF files give us ISA information, required libraries with versions, and
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potentially provided interface versions. This latter information is
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missing from a large set of libraries on OpenSolaris, built without
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versioned interfaces.
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It seems that an ELF file, on upload, can be tested for its ELF
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dependencies, and that these files in turn can be tested for presence.
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If any of the latter file's revisions provide versions, then these can
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be tested and translated into a minimum package requirement for the
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package containing the introduced ELF file.
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We always want the latest version surface, so we don't want to send a
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new header file without the corresponding ELF objects its changes caused
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to be generated.
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It seems that ELF differences are only useful for determining whether an
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incoming transaction is significant. For instance, RE delivers a group
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of change that actually contains no change to the non-ELF files, and the
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change to the ELF files is non-ELF significant. In this case, perhaps
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the delivery should fail/warn.
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XXX Can we do something similar for JAR files? Tasting JAR files is
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outlined in $SRC/cmd/file/file.c:zipfile(), since a JAR file is a zip
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file with extra header information. [1]
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XXX Can we do something similar for Perl or Python (or any language with
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internal versioning statements)?
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XXX There's really no way to tie the kernel to libc in the current
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system, or in pkg(1M). Should we be adding a simple signature, or
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reusing library versioning, or must it be left to a human (expressing it
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via pkg(1M) dependencies)?
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[1] Sun Microsystems, Inc., JAR File Specification,
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http://java.sun.com/j2se/1.4.2/docs/guide/jar/jar.html
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