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Software Update:MAR: Difference between revisions
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→MAR extraction tools:: Updating URL
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This question was given a fair amount of consideration. Ultimately, we decided to go with a custom file format because using libjar would have required a fair bit of hacking. Writing custom code was a simpler option, and it resulted in less code (mar_read.c is less than 300 lines of code). Moreover, the update system does not need a standard file format. The elements stored in the archive are bzip2 compressed binary diffs, generated using a variation of bsdiff. So, being able to unpack the archive file using standard tools wouldn't be very useful in and of itself. | This question was given a fair amount of consideration. Ultimately, we decided to go with a custom file format because using libjar would have required a fair bit of hacking. Writing custom code was a simpler option, and it resulted in less code (mar_read.c is less than 300 lines of code). Moreover, the update system does not need a standard file format. The elements stored in the archive are bzip2 compressed binary diffs, generated using a variation of bsdiff. So, being able to unpack the archive file using standard tools wouldn't be very useful in and of itself. | ||
== MAR extraction tools | == MAR extraction tools == | ||
There’s 2 different python scripts: | There’s 2 different python scripts: | ||
* http://hg.mozilla.org/build/tools/file/b77b517eab66/buildfarm/utils/mar.py | * http://hg.mozilla.org/build/tools/file/b77b517eab66/buildfarm/utils/mar.py | ||
* https://github.com/ | * https://github.com/mozilla/build-mar | ||
Note: | Note: | ||
* The latter is more recent, but has more dependencies. | * The latter is more recent, but has more dependencies. | ||
* The former works just fine for extracting files | * The former works just fine for extracting files | ||
** to use the former: cd tmp_dir; mar.py -x ../foo.mar | ** to use the former: cd tmp_dir; mar.py -x ../foo.mar | ||