On 02/16/18 21:02, Robert P. J. Day wrote: > just downloaded some sizable centos 7 iso images, and thought i > would validate them to whatever extent "isovfy" can do that, but > here's what happened in the blink of an eye: > > $ isovfy CentOS-7-x86_64-Everything-1708.iso > Root at extent 1d, 2048 bytes > [0 0] > No errors found > $ > > that iso image is well over 8G in size, but i got that response back > in about the time it took to hit the ENTER key. there is no way that > command could have examined that entire image, so what exactly is > isovfy supposed to be doing? does it just look at the header? does it > do *anything*? > From the man page....
isovfy is a utility to verify the integrity of an iso9660 image. Most of the tests in isovfy were added after bugs were discovered in early ver‐ sions of genisoimage. It isn't all that clear how useful this is any‐ more, but it doesn't hurt to have this around. Besides, doesn't CentOS provide checksums for their ISOs? -- A motto of mine is: When in doubt, try it out
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