Date: Sun, 02 Oct 2016 01:44:59 -0700 From: perryh@pluto.rain.com (Perry Hutchison) To: wblock@wonkity.com, smithi@nimnet.asn.au Cc: dpchrist@holgerdanske.com, freebsd-questions@freebsd.org Subject: Re: FreeBSD-10.3-RELEASE-i386-memstick.img installer changes contents of USB flash drive Message-ID: <57f0c90b.o0Ro%2Bn5Fmlq48GpP%perryh@pluto.rain.com> In-Reply-To: <alpine.BSF.2.20.1610011120520.32958@wonkity.com> References: <mailman.4241.1475049553.1479.freebsd-questions@freebsd.org> <20160929014801.W6806@sola.nimnet.asn.au> <alpine.BSF.2.20.1609290658280.7457@wonkity.com> <20161001235138.N6806@sola.nimnet.asn.au> <alpine.BSF.2.20.1610011120520.32958@wonkity.com>
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Warren Block <wblock@wonkity.com> wrote: > On Sun, 2 Oct 2016, Ian Smith wrote: > > And then Perry Hutchinson (cc'd) is having the 'opposite' problem of > > wanting to update the 10.3 i386 memstick he'd booted off with gpart > > recover and gpart add for another partition, apparently successfully > > according to gpart show, only to have the updates disappear on reboot? > > Pretty sure that's an unrelated problem I've seen myself: > http://www.wonkity.com/~wblock/docs/html/labels.html > > If you change partition labels (or something) and then mount them, that > information is lost. If you reboot first, something works right. What I'm seeing does not fit that pattern. The sequence is: 1. dd the memstick image file to a 4GB flash drive. 2. Boot memstick in single-user mode, which mounts the root partition read-only and complains about a missing secondary GPT. 3. # gpart recover da0 4. Reboot, again in single-user mode, which mounts the root partition read-only. No GPT complaints this time. 5. # gpart show da0 This shows 3 partitions and 3.1 GB of free space. 6. # gpart add -t freebsd-ufs da0 7. # gpart show da0 This shows 4 partitions and no free space, as expected. 8. Reboot, again in single-user mode, which mounts the root partition read-only. No GPT complaints. 9. # gpart show da0 This shows 3 partitions and 3.1 GB of free space. WTF????? Note that nothing got mounted between steps 6 and 8. I can do 'gpart modify -l' to add labels to the 3 original partitions before or after step 6, and those labels survive the step 8 reboot although the result of 'gpart add' does not. I tried setting kern.geom.debugflags to 16 (the foot-shooting flag) before the 'gpart add' and it made no difference. And no, it is not a case of an orderly shutdown having written out an old in-memory instance of the GPT: I went so far as to yank the stick out of the USB port after step 7, and then power-cycle the machine, and the new partition *still* was gone after the reboot.
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