Perché non riesco ad aprire i file DMG che risiedono su un filesystem NFS di sola lettura?

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Ho scoperto uno strano problema ... se ho file immagine disco (DMG) che risiedono su una condivisione NFS di sola lettura, non posso aprirli in Mac OS X 10.7.5. Gli stessi file si aprono bene quando si accede su AFP. Tuttavia, provando ad aprirli usando hdiutil attach quando sono nei risultati della condivisione NFS in "attach failed - Read-only file system": 

bash-3.2# /usr/bin/hdiutil attach /Volumes/nfs_share/Some.dmg
hdiutil: attach failed - Read-only file system

Anche se la condivisione AFP è di sola lettura, posso allegare quelle stesse immagini. Ma per qualche ragione, una condivisione NFS di sola lettura non funziona.

In definitiva ciò che voglio fare è collegare le immagini con un file ombra , per montare le immagini di sola lettura come in lettura-scrittura. Ma anche questo non funziona allo stesso modo: 

bash-3.2# /usr/bin/hdiutil attach /Volumes/nfs_share/Some.dmg -mountpoint /Somewhere -shadow /path/to/Some-Shadow
hdiutil: attach failed - Read-only file system

Di nuovo, funziona perfettamente se l'immagine è servita tramite AFP. Funziona bene anche se la condivisione NFS è in lettura-scrittura, ma per ragioni di sicurezza non posso farlo.

Come posso montare i file DMG che risiedono su una condivisione NFS di sola lettura?

Informazioni aggiuntive:

La riga relativa da /etc/exports sul server FreeNAS (FreeBSD 8.2-RELEASE-p7): 

/mnt/raid/netboot -alldirs -ro -mapall=netboot:netboot -network 10.100.0.0/16

L'output di /usr/bin/hdiutil attach -verbose /Volumes/netboot/Lion.nbi/Library.dmg -notremovable -shadow /private/var/netboot/Library-Shadow -owners on -noverify -noautofsck -nobrowse : 

Initializing…
DIBackingStoreInstantiatorProbe: interface  0, score      100, CBSDBackingStore
DIBackingStoreInstantiatorProbe: interface  1, score    -1000, CBundleBackingStore
DIBackingStoreInstantiatorProbe: interface  2, score    -1000, CRAMBackingStore
DIBackingStoreInstantiatorProbe: interface  3, score      100, CCarbonBackingStore
DIBackingStoreInstantiatorProbe: interface  4, score    -1000, CDevBackingStore
DIBackingStoreInstantiatorProbe: interface  5, score    -1000, CCURLBackingStore
DIBackingStoreInstantiatorProbe: interface  6, score    -1000, CVectoredBackingStore
CBSDBackingStore::newProbe stat() failed.  No such file or directory.
DIBackingStoreInstantiatorProbe: interface  0, score        1, CBSDBackingStore
DIBackingStoreInstantiatorProbe: interface  1, score    -1000, CBundleBackingStore
DIBackingStoreInstantiatorProbe: interface  2, score    -1000, CRAMBackingStore
DIBackingStoreInstantiatorProbe: interface  3, score    -1000, CCarbonBackingStore
DIBackingStoreInstantiatorProbe: interface  4, score    -1000, CDevBackingStore
DIBackingStoreInstantiatorProbe: interface  5, score    -1000, CCURLBackingStore
DIBackingStoreInstantiatorProbe: interface  6, score    -1000, CVectoredBackingStore
DIBackingStoreInstantiatorProbe: interface  0, score      100, CBSDBackingStore
DIBackingStoreInstantiatorProbe: interface  1, score    -1000, CBundleBackingStore
DIBackingStoreInstantiatorProbe: interface  2, score    -1000, CRAMBackingStore
DIBackingStoreInstantiatorProbe: interface  3, score      100, CCarbonBackingStore
DIBackingStoreInstantiatorProbe: interface  4, score    -1000, CDevBackingStore
DIBackingStoreInstantiatorProbe: interface  5, score    -1000, CCURLBackingStore
DIBackingStoreInstantiatorProbe: interface  6, score    -1000, CVectoredBackingStore
Attaching…
Error 30 (Read-only file system).
Finishing…
DIHLDiskImageAttach() returned 30
hdiutil: attach failed - Read-only file system

Output di rpcinfo -p sul server NFS: 

   program vers proto   port  service
    100000    4   tcp    111  rpcbind
    100000    3   tcp    111  rpcbind
    100000    2   tcp    111  rpcbind
    100000    4   udp    111  rpcbind
    100000    3   udp    111  rpcbind
    100000    2   udp    111  rpcbind
    100000    4 local    111  rpcbind
    100000    3 local    111  rpcbind
    100000    2 local    111  rpcbind
    100005    1   udp    967  mountd
    100005    3   udp    967  mountd
    100005    1   tcp    967  mountd
    100005    3   tcp    967  mountd
    100003    2   udp   2049  nfs
    100003    3   udp   2049  nfs
    100003    2   tcp   2049  nfs
    100003    3   tcp   2049  nfs
    100024    1   udp    689  status
    100024    1   tcp    689  status
    100021    0   udp    616  nlockmgr
    100021    0   tcp    927  nlockmgr
    100021    1   udp    616  nlockmgr
    100021    1   tcp    927  nlockmgr
    100021    3   udp    616  nlockmgr
    100021    3   tcp    927  nlockmgr
    100021    4   udp    616  nlockmgr
    100021    4   tcp    927  nlockmgr

Output di mount sul client Mac OS X 10.7.5: 

/dev/disk1s2 on / (hfs, local)
devfs on /dev (devfs, local, nobrowse)
afp_0egBhf12TAP01SptRt47XSdj-3.2c000002 on /private/var/netboot (afpfs, nobrowse)
afp_0egBhf12TAP01SptRt47XSdj-4.2c000004 on /Network/Applications (afpfs, read-only)
map -hosts on /net (autofs, nosuid, automounted, nobrowse)
map auto_home on /home (autofs, automounted, nobrowse)
afp_0egBhf12TAP01SptRt47XSdj-4.2c000008 on /Network/Servers/chef.farcry.sitepalette.com/Users (afpfs, nodev, nosuid, automounted, nobrowse, mounted by jnet)
afp_0egBhf12TAP01SptRt47XSdj-4.2c000009 on /Volumes/Users (afpfs, nodev, nosuid, mounted by jnet)
10.100.1.2:/mnt/raid/netboot on /Volumes/netboot (nfs)

E infine, l'output di /usr/bin/hdiutil attach -debug /Volumes/netboot/Lion.nbi/Library.dmg -notremovable -shadow /private/var/netboot/Library-Shadow -owners on -noverify -noautofsck -nobrowse : 

calling DIHLDiskImageAttach with 
skip-verify: true
auto-fsck: false
drive-options:
quiet: false
shadow-url: file://localhost/private/var/netboot/Library-Shadow
mount-nobrowse: true
enable-owners: true
verbose: false
debug: true
agent: hdiutil
fixed-disk: true
image-options:
main-url: file://localhost/Volumes/netboot/Lion.nbi/Library.dmg
2012-11-27 12:02:23.053 hdiutil[23401:707] DIHLDiskImageAttach: input dictionary {
    agent = hdiutil;
    "auto-fsck" = 0;
    debug = 1;
    "drive-options" =     {
    };
    "enable-owners" = 1;
    "fixed-disk" = 1;
    "image-options" =     {
    };
    "main-url" = "file://localhost/Volumes/netboot/Lion.nbi/Library.dmg";
    "mount-nobrowse" = 1;
    quiet = 0;
    "shadow-url" = "file://localhost/private/var/netboot/Library-Shadow";
    "skip-verify" = 1;
    verbose = 0;
}
2012-11-27 12:02:23.054 hdiutil[23401:707] DIHLDiskImageAttach: disabling legacy image format attach
2012-11-27 12:02:23.055 hdiutil[23401:707] DIHLDiskImageAttach: newImagekeys = {
    "legacy-disabled" = 1;
}
2012-11-27 12:02:23.055 hdiutil[23401:707] DIHLDiskImageAttach: creating DIHelperProxy
2012-11-27 12:02:23.056 hdiutil[23401:707] with dictionary: {
    agent = hdiutil;
    "auto-fsck" = 0;
    debug = 1;
    "drive-options" = <62706c69 73743030 d0080000 00000000 01010000 00000000 00010000 00000000 00000000 00000000 0009>;
    "enable-owners" = 1;
    "fixed-disk" = 1;
    "image-options" = <62706c69 73743030 d101025f 100f6c65 67616379 2d646973 61626c65 6409080b 1d000000 00000001 01000000 00000000 03000000 00000000 00000000 00000000 1e>;
    "main-url" = "file://localhost/Volumes/netboot/Lion.nbi/Library.dmg";
    "mount-nobrowse" = 1;
    operation = DIHelperAttach;
    quiet = 0;
    "shadow-url" = "file://localhost/private/var/netboot/Library-Shadow";
    "skip-verify" = 1;
    verbose = 0;
}
2012-11-27 12:02:23.056 hdiutil[23401:707] [DIHelperProxy alloc]
2012-11-27 12:02:23.056 hdiutil[23401:707] [DIHelperProxy alloc] returning self 0x7fa39b00d690, retainCount 1
2012-11-27 12:02:23.057 hdiutil[23401:707] DIHLDiskImageAttach: running DIHelperProxy
2012-11-27 12:02:23.057 hdiutil[23401:707] [DIHelperProxy performOperationReturning] entry
2012-11-27 12:02:23.057 hdiutil[23401:707] [DIHelperProxy performOperationReturning] detaching thread
2012-11-27 12:02:23.058 hdiutil[23401:2803] [DIHelperProxy workerThread] entry
2012-11-27 12:02:23.058 hdiutil[23401:2803] [DIHelperProxy workerThread] setting up server
2012-11-27 12:02:23.059 hdiutil[23401:2803] [DIHelperProxy threadSetupServer] entry
2012-11-27 12:02:23.059 hdiutil[23401:2803] [DIHelperProxy threadSetupServer] setting up _headerConnection
2012-11-27 12:02:23.060 hdiutil[23401:2803] [DIHelperProxy threadSetupServer] setting up _headerConnection rootObject
2012-11-27 12:02:23.060 hdiutil[23401:2803] [DIHelperProxy threadSetupServer] adding NSConnectionDidInitializeNotification notification
2012-11-27 12:02:23.061 hdiutil[23401:2803] [DIHelperProxy threadSetupServer] exiting
2012-11-27 12:02:23.061 hdiutil[23401:2803] [DIHelperProxy workerThread] launching
2012-11-27 12:02:23.061 hdiutil[23401:2803] [DIHelperProxy threadLaunchToolAuthenticated] entry
2012-11-27 12:02:23.063 hdiutil[23401:2803] launching helper tool at "/System/Library/PrivateFrameworks/DiskImages.framework/Resources/diskimages-helper".
2012-11-27 12:02:23.063 hdiutil[23401:2803] [DIHelperProxy threadLaunchToolAuthenticated] adding NSTaskDidTerminateNotification notification
2012-11-27 12:02:23.063 hdiutil[23401:2803] [DIHelperProxy thread LaunchToolAuthenticated] launching
2012-11-27 12:02:23.065 hdiutil[23401:2803] [DIHelperProxy threadLaunchToolAuthenticated] exiting
2012-11-27 12:02:23.065 hdiutil[23401:2803] [DIHelperProxy workerThread] running runloop
2012-11-27 12:02:23.081 hdiutil[23401:2803] [DIHelperProxy helperConnectionInitialized] entry
2012-11-27 12:02:23.081 hdiutil[23401:2803] [DIHelperProxy helperConnectionInitialized] adding new NSConnectionDidDieNotification notification
2012-11-27 12:02:23.081 hdiutil[23401:2803] [DIHelperProxy helperConnectionInitialized] removing old NSConnectionDidDieNotification notification
2012-11-27 12:02:23.082 hdiutil[23401:2803] [DIHelperProxy helperConnectionInitialized] removing old connection rootObject
2012-11-27 12:02:23.082 hdiutil[23401:2803] [DIHelperProxy helperConnectionInitialized] invalidating old connection
2012-11-27 12:02:23.083 hdiutil[23401:2803] [DIHelperProxy helperConnectionInitialized] releasing old connection
2012-11-27 12:02:23.083 hdiutil[23401:2803] [DIHelperProxy helperConnectionInitialized] and replacing with new connection
2012-11-27 12:02:23.083 hdiutil[23401:2803] [DIHelperProxy helperConnectionInitialized] exit
2012-11-27 12:02:23.085 hdiutil[23401:2803] [DIHelperProxy connectToFramework] entry, helper 0x7fa39b016940
2012-11-27 12:02:23.085 hdiutil[23401:2803] [DIHelperProxy connectToFramework] exit
2012-11-27 12:02:23.186 hdiutil[23401:2803] [DIHelperProxy sendOperationToHelper] entry
2012-11-27 12:02:23.187 hdiutil[23401:2803] [DIHelperProxy sendOperationToHelper] starting operation with helper
2012-11-27 12:02:23.190 hdiutil[23401:2803] [DIHelperProxy sendOperationToHelper] exit
2012-11-27 12:02:23.194 hdiutil[23401:2803] [DIHelperProxy frameworkCallbackWithDictionary] entry
status proc called: initialize
Initializing…
myStatusProc: returning 0 
2012-11-27 12:02:23.199 hdiutil[23401:2803] [DIHelperProxy frameworkCallbackWithDictionary] exit
2012-11-27 12:02:23.201 diskimages-helper[23407:2503] updateImageAndDriveDictionaries: before update _imageOptions: {
    "enable-keychain" = 1;
    writeable = 0;
}
2012-11-27 12:02:23.201 diskimages-helper[23407:2503] updateImageAndDriveDictionaries: _imageOptions: {
    "enable-keychain" = 1;
    "legacy-disabled" = 1;
    writeable = 0;
}
2012-11-27 12:02:23.202 diskimages-helper[23407:2503] _driveOptions: {
    "auto-fsck" = 0;
    autodiskmount = 1;
    removable = 0;
    "unmount-timeout" = 0;
}
2012-11-27 12:02:23.202 diskimages-helper[23407:2503] DIHelperAttach: performOperation: initializing framework
2012-11-27 12:02:23.202 diskimages-helper[23407:2503] {
    agent = hdiutil;
    "auto-fsck" = 0;
    "auto-fsck-failure-override-type" = callback;
    "auto-open-ro-root" = 0;
    "auto-open-rw-root" = 0;
    "auto-stretch" = 0;
    "bundlebs-checkpointing" = 0;
    "bundlebs-localcloseonflush" = 0;
    "bundlebs-localcloseonidle" = 0;
    "bundlebs-localcloseonsleep" = 0;
    "bundlebs-localfdcount" = 6;
    "bundlebs-remotecloseonflush" = 0;
    "bundlebs-remotecloseonidle" = 0;
    "bundlebs-remotecloseonsleep" = 0;
    "bundlebs-remotefdcount" = 3;
    "burn-apple-supported-devices-only" = 0;
    "burn-no-underrun-protection" = 0;
    "burn-synthesize-content" = 1;
    "bzip2-level" = 0;
    "callback-with-sla" = 1;
    debug = 1;
    "disable-encrypted-images" = 0;
    "disable-kernel-mounting" = 1;
    "disable-owners" = 0;
    "drive-options" = <62706c69 73743030 d0080000 00000000 01010000 00000000 00010000 00000000 00000000 00000000 0009>;
    "enable-owners" = 1;
    "filevault-default-case-sensitive-file-system" = "Case-sensitive Journaled HFS+";
    "filevault-default-encryption-type" = "AES-128";
    "filevault-default-file-system" = "Journaled HFS+";
    "filevault-default-image-type" = SPARSEBUNDLE;
    "filevault-default-partition-type" = SPUD;
    "filevault-default-volume-name" = FileVault;
    "fixed-disk" = 1;
    "force-idme" = 0;
    "hfsplus-stretch-parameters" =     {
        "hfsplus-stretch-allocation-block-size" = 4096;
        "hfsplus-stretch-allocation-file-size" = 8388608;
        "hfsplus-stretch-threshold" = 524288;
    };
    "idle-timeout" = 15;
    "ifd-format" = UDZO;
    "ifd-ignore-io-errors" = 1;
    "ifd-segment-size" = 0;
    "iff-format" = UDZO;
    "iff-fs" = "HFS+";
    "iff-layout" = SPUD;
    "iff-source-owners" = auto;
    "iff-spotlight-indexing" = 0;
    "iff-temp-sparse-band-size" = 20480;
    "iff-temp-use-rw-if-possible" = 1;
    "iff-usehelper" = 1;
    "ignore-bad-checksums" = 0;
    "image-options" = <62706c69 73743030 d101025f 100f6c65 67616379 2d646973 61626c65 6409080b 1d000000 00000001 01000000 00000000 03000000 00000000 00000000 00000000 1e>;
    "main-url" = "file://localhost/Volumes/netboot/Lion.nbi/Library.dmg";
    "mount-attempted" = 1;
    "mount-nobrowse" = 1;
    "mount-point" = "/Volumes/";
    "mount-private" = 0;
    "mount-required" = 1;
    "mount-type" = in;
    "nbi-spotlight-indexing" = 0;
    operation = DIHelperAttach;
    "progress-delay" = 5;
    "pthread-reader-cap" = 4;
    quiet = 0;
    "reauthenticate-upon-wake" = 1;
    "shadow-url" = "file://localhost/private/var/netboot/Library-Shadow";
    "skip-auto-fsck-for-system-images" = 1;
    "skip-idme" = 1;
    "skip-idme-reveal" = 0;
    "skip-idme-trash" = 0;
    "skip-previously-verified" = 1;
    "skip-sla" = 0;
    "skip-verify" = 1;
    "skip-verify-locked" = 0;
    "skip-verify-remote" = 1;
    "sparsebundle-compactonidle" = 0;
    "suppress-uiagent" = 1;
    "unmount-timeout" = 0;
    "use-compressed-xml" = 0;
    "use-keychain" = 1;
    verbose = 0;
    "zlib-level" = 1;
}
DILoadDriver: checking for disk image driver
DILoadDriver: DI_kextExists() returned 0x00000000 (0)
DIIsInitialized: returning NO
2012-11-27 12:02:23.206 diskimages-helper[23407:2503] -checkForPreviouslyAttachedImage: entry
2012-11-27 12:02:23.206 diskimages-helper[23407:2503] imageURL file://localhost/Volumes/netboot/Lion.nbi/Library.dmg
2012-11-27 12:02:23.206 diskimages-helper[23407:2503] shadowURL file://localhost/private/var/netboot/Library-Shadow
2012-11-27 12:02:23.207 diskimages-helper[23407:2503] sectionStart (null) sectionLength (null)
2012-11-27 12:02:23.207 diskimages-helper[23407:2503] checkForPreviouslyAttachedImage: setting legacy-disabled to 1
DIIsInitialized: returning YES
DIBackingStoreNewWithCFURL: entry with
file://localhost/Volumes/netboot/Lion.nbi/Library.dmg
skip-permissions-check: true
legacy-disabled: true
DIBackingStoreInstantiatorProbe: entry
file://localhost/Volumes/netboot/Lion.nbi/Library.dmg
skip-permissions-check: true
legacy-disabled: true
DIBackingStoreInstantiatorProbe: probing interface 0 CBSDBackingStore
CBSDBackingStore::newProbe score 100 for file://localhost/Volumes/netboot/Lion.nbi/Library.dmg
DIBackingStoreInstantiatorProbe: probing interface 1 CBundleBackingStore
CBundleBackingStore::newProbe score -1000 for file://localhost/Volumes/netboot/Lion.nbi/Library.dmg
DIBackingStoreInstantiatorProbe: probing interface 2 CRAMBackingStore
CRAMBackingStore::probe: scheme "file": not ram: or ramdisk: scheme.
CRAMBackingStore::probe: score -1000 for file://localhost/Volumes/netboot/Lion.nbi/Library.dmg
DIBackingStoreInstantiatorProbe: probing interface 3 CCarbonBackingStore
CCarbonBackingStore::newProbe: setting initial rval to +100
CCarbonBackingStore::newProbe score 100 for file://localhost/Volumes/netboot/Lion.nbi/Library.dmg
DIBackingStoreInstantiatorProbe: probing interface 4 CDevBackingStore
CDevBackingStore::newProbe: not /dev/disk or /dev/rdisk (/Volumes/netboot/Lion.nbi/Library.dmg).CDevBackingStore::newProbe score -1000 for 
DIBackingStoreInstantiatorProbe: probing interface 5 CCURLBackingStore
CCURLBackingStore::probe: scheme is: file
CCURLBackingStore::probe: not recognized URL scheme.
CCURLBackingStore::probe: score -1000 for file://localhost/Volumes/netboot/Lion.nbi/Library.dmg
DIBackingStoreInstantiatorProbe: probing interface 6 CVectoredBackingStore
CVectoredBackingStore::newProbe not "vectored" scheme.
CVectoredBackingStore::newProbe score -1000 for file://localhost/Volumes/netboot/Lion.nbi/Library.dmg
DIBackingStoreInstantiatorProbe: selecting CBSDBackingStore
DIBackingStoreNewWithCFURL: CBSDBackingStore
CBSDBackingStore::setNoFollow: setting _noFollow to 0
DIBackingStoreNewWithCFURL: instantiator returned 0
DIBackingStoreNewWithCFURL: returning 0
2012-11-27 12:02:23.208 diskimages-helper[23407:2503] -checkForPreviouslyAttachedImage: resolving file://localhost/Volumes/netboot/Lion.nbi/Library.dmg returned 0
DIIsInitialized: returning YES
DIBackingStoreNewWithCFURL: entry with
file://localhost/private/var/netboot/Library-Shadow
skip-permissions-check: true
DIBackingStoreInstantiatorProbe: entry
file://localhost/private/var/netboot/Library-Shadow
skip-permissions-check: true
DIBackingStoreInstantiatorProbe: probing interface 0 CBSDBackingStore
CBSDBackingStore::newProbe score 1 for file://localhost/private/var/netboot/Library-Shadow
DIBackingStoreInstantiatorProbe: probing interface 1 CBundleBackingStore
CBundleBackingStore::newProbe score -1000 for file://localhost/private/var/netboot/Library-Shadow
DIBackingStoreInstantiatorProbe: probing interface 2 CRAMBackingStore
CRAMBackingStore::probe: scheme "file": not ram: or ramdisk: scheme.
CRAMBackingStore::probe: score -1000 for file://localhost/private/var/netboot/Library-Shadow
DIBackingStoreInstantiatorProbe: probing interface 3 CCarbonBackingStore
CCarbonBackingStore::newProbe stat() failed.  No such file or directory.
CCarbonBackingStore::newProbe score -1000 for file://localhost/private/var/netboot/Library-Shadow
DIBackingStoreInstantiatorProbe: probing interface 4 CDevBackingStore
CDevBackingStore::newProbe: not /dev/disk or /dev/rdisk (/private/var/netboot/Library-Shadow).CDevBackingStore::newProbe score -1000 for 
DIBackingStoreInstantiatorProbe: probing interface 5 CCURLBackingStore
CCURLBackingStore::probe: scheme is: file
CCURLBackingStore::probe: not recognized URL scheme.
CCURLBackingStore::probe: score -1000 for file://localhost/private/var/netboot/Library-Shadow
DIBackingStoreInstantiatorProbe: probing interface 6 CVectoredBackingStore
CVectoredBackingStore::newProbe not "vectored" scheme.
CVectoredBackingStore::newProbe score -1000 for file://localhost/private/var/netboot/Library-Shadow
DIBackingStoreInstantiatorProbe: selecting CBSDBackingStore
DIBackingStoreNewWithCFURL: CBSDBackingStore
DIBackingStoreNewWithCFURL: instantiator returned 2
DIBackingStoreNewWithCFURL: returning 2
DIResolveURLToBackingStore: unable to resolve to any backing store class. 2. 
2012-11-27 12:02:23.208 diskimages-helper[23407:2503] -checkForPreviouslyAttachedImage: resolving shadow file://localhost/private/var/netboot/Library-Shadow returned 2
2012-11-27 12:02:23.208 diskimages-helper[23407:2503] DIHelperAttach: performOperation: resolving disk image
DIIsInitialized: returning YES
DIIsInitialized: returning YES
DIBackingStoreNewWithCFURL: entry with
file://localhost/Volumes/netboot/Lion.nbi/Library.dmg
legacy-disabled: true
writeable: false
enable-keychain: true
image-path: /Volumes/netboot/Lion.nbi/Library.dmg
DIBackingStoreInstantiatorProbe: entry
file://localhost/Volumes/netboot/Lion.nbi/Library.dmg
legacy-disabled: true
writeable: false
enable-keychain: true
image-path: /Volumes/netboot/Lion.nbi/Library.dmg
DIBackingStoreInstantiatorProbe: probing interface 0 CBSDBackingStore
CBSDBackingStore::newProbe score 100 for file://localhost/Volumes/netboot/Lion.nbi/Library.dmg
DIBackingStoreInstantiatorProbe: probing interface 1 CBundleBackingStore
CBundleBackingStore::newProbe score -1000 for file://localhost/Volumes/netboot/Lion.nbi/Library.dmg
DIBackingStoreInstantiatorProbe: probing interface 2 CRAMBackingStore
CRAMBackingStore::probe: scheme "file": not ram: or ramdisk: scheme.
CRAMBackingStore::probe: score -1000 for file://localhost/Volumes/netboot/Lion.nbi/Library.dmg
DIBackingStoreInstantiatorProbe: probing interface 3 CCarbonBackingStore
CCarbonBackingStore::newProbe: setting initial rval to +100
CCarbonBackingStore::newProbe score 100 for file://localhost/Volumes/netboot/Lion.nbi/Library.dmg
DIBackingStoreInstantiatorProbe: probing interface 4 CDevBackingStore
CDevBackingStore::newProbe: not /dev/disk or /dev/rdisk (/Volumes/netboot/Lion.nbi/Library.dmg).CDevBackingStore::newProbe score -1000 for 
DIBackingStoreInstantiatorProbe: probing interface 5 CCURLBackingStore
CCURLBackingStore::probe: scheme is: file
CCURLBackingStore::probe: not recognized URL scheme.
CCURLBackingStore::probe: score -1000 for file://localhost/Volumes/netboot/Lion.nbi/Library.dmg
DIBackingStoreInstantiatorProbe: probing interface 6 CVectoredBackingStore
CVectoredBackingStore::newProbe not "vectored" scheme.
CVectoredBackingStore::newProbe score -1000 for file://localhost/Volumes/netboot/Lion.nbi/Library.dmg
DIBackingStoreInstantiatorProbe: selecting CBSDBackingStore
DIBackingStoreNewWithCFURL: CBSDBackingStore
CBSDBackingStore::setPermission: opening /Volumes/netboot/Lion.nbi/Library.dmg
CBSDBackingStore::OpenLockFriendly: mapping flags 0x00000000 -> 0x00000014 (locks are MANDATORY)
CBSDBackingStore:OpenLockFriendly: could not open with lock 30
DIBackingStoreNewWithCFURL: instantiator returned 30
DIBackingStoreNewWithCFURL: returning 30
DIResolveURLToBackingStore: unable to resolve to any backing store class. 30. 
DIResolveURLToDiskImage: resolving backing store/file encoding failed. 30. 
2012-11-27 12:02:23.211 hdiutil[23401:2803] [DIHelperProxy frameworkCallbackWithDictionary] entry
status proc called: attach
Attaching…
Error 30 (Read-only file system).
myStatusProc: returning 0 
2012-11-27 12:02:23.227 hdiutil[23401:2803] [DIHelperProxy frameworkCallbackWithDictionary] exit
2012-11-27 12:02:23.228 hdiutil[23401:2803] [DIHelperProxy frameworkCallbackWithDictionary] entry
status proc called: cleanup
Finishing…
myStatusProc: returning 0 
2012-11-27 12:02:23.228 hdiutil[23401:2803] [DIHelperProxy frameworkCallbackWithDictionary] exit
2012-11-27 12:02:23.229 diskimages-helper[23407:2503] DIHelperAttach performOperation: returning 30
2012-11-27 12:02:23.229 diskimages-helper[23407:2503] -decrementBackgroundThreadCount: _backgroundThreadCount is now 0.
2012-11-27 12:02:23.229 diskimages-helper[23407:303] DIHelper _report_results: reporting {
    payload =     {
    };
    "result-code" = 30;
}
2012-11-27 12:02:23.230 hdiutil[23401:2803] reportResultsToFramework: proxy has finished operation
2012-11-27 12:02:23.230 hdiutil[23401:2803] reportResultsToFramework: results are: {
    payload =     {
    };
    "result-code" = 30;
}
2012-11-27 12:02:23.230 hdiutil[23401:2803] reportResultsToFramework: _threadResultsError is 30
2012-11-27 12:02:23.231 hdiutil[23401:2803] reportResultsToFramework: disconnecting from helper.
2012-11-27 12:02:23.231 diskimages-helper[23407:303] -setCanTerminate: main thread can exit
2012-11-27 12:02:23.332 hdiutil[23401:2803] [DIHelperProxy disconnectFromHelper] entry
2012-11-27 12:02:23.333 hdiutil[23401:2803] disconnectFromHelper: removing observers
2012-11-27 12:02:23.333 hdiutil[23401:2803] disconnectFromHelper: terminating proxy
2012-11-27 12:02:23.334 diskimages-helper[23407:303] DIHelper: terminateHelper: entry.
2012-11-27 12:02:23.334 hdiutil[23401:2803] disconnectFromHelper: terminated proxy
2012-11-27 12:02:23.335 hdiutil[23401:2803] [DIHelperProxy disconnectFromHelper] releasing helper
2012-11-27 12:02:23.335 hdiutil[23401:2803] [DIHelperProxy disconnectFromHelper] exit
2012-11-27 12:02:23.435 diskimages-helper[23407:303] [DIHelper frameworkConnectionDied] entry
2012-11-27 12:02:23.435 diskimages-helper[23407:303] [DIHelper frameworkConnectionDied] releasing connection
2012-11-27 12:02:23.435 diskimages-helper[23407:303] [DIHelper frameworkConnectionDied] releasing frameworkProxy
2012-11-27 12:02:23.435 diskimages-helper[23407:303] -DIHelperAgentMaster terminateUIAgentConnection.
2012-11-27 12:02:23.435 diskimages-helper[23407:303] [DIHelper frameworkConnectionDied] marking _frameworkDisconnected
2012-11-27 12:02:23.435 diskimages-helper[23407:303] [DIHelper frameworkConnectionDied] exiting
2012-11-27 12:02:24.232 hdiutil[23401:2803] [DIHelperProxy workerThread] removing NSConnectionDidDieNotification observers
2012-11-27 12:02:24.233 hdiutil[23401:2803] [DIHelperProxy workerThread] removing NSConnectionDidInitializeNotification observers
2012-11-27 12:02:24.234 hdiutil[23401:2803] [DIHelperProxy workerThread] removing NSTaskDidTerminateNotification observers
2012-11-27 12:02:24.234 hdiutil[23401:2803] [DIHelperProxy threadRunRunLoop] invalidating connection
2012-11-27 12:02:24.235 diskimages-helper[23407:303] DIHelper dealloc.
2012-11-27 12:02:24.234 hdiutil[23401:2803] [DIHelperProxy threadRunRunLoop] releasing connection
2012-11-27 12:02:24.235 diskimages-helper[23407:303] -DIHelperAgentMaster terminateUIAgentConnection.
2012-11-27 12:02:24.235 hdiutil[23401:2803] [DIHelperProxy workerThread] after running runloop
2012-11-27 12:02:24.235 diskimages-helper[23407:303] helper: child_after_exec returning 0
2012-11-27 12:02:24.235 hdiutil[23401:2803] [DIHelperProxy workerThread] waiting for task to terminate to avoid zombies
2012-11-27 12:02:24.236 hdiutil[23401:2803] [DIHelperProxy workerThread] releasing task
2012-11-27 12:02:24.236 hdiutil[23401:2803] [DIHelperProxy workerThread] exiting
2012-11-27 12:02:24.236 hdiutil[23401:707] [DIHelperProxy performOperationReturning] returning 30
2012-11-27 12:02:24.237 hdiutil[23401:707] DIHLDiskImageAttach: DIHelperProxy returned 30
2012-11-27 12:02:24.237 hdiutil[23401:707] [DIHelperProxy dealloc]
DIHLDiskImageAttach() returned 30
hdiutil: attach failed - Read-only file system
kyle:~ root#
    
posta Josh 21.11.2012 - 15:18
fonte

2 risposte

11

Sono interessato a questa domanda dal novembre 2012 e ho persino configurato una VM FreeNAS per riprodurre il problema.

Alla fine ho rinunciato ma da quando la domanda è stata resuscitata condividerò ciò che ho scoperto a quei tempi e nelle ultime ore (fortunatamente non ho eliminato la VM) e quale penso che sia la causa di questo problema è. Ho anche trovato una soluzione alternativa.

La mia configurazione

Prima di tutto, questa è la mia configurazione di prova:

  • OS X 10.8.2 (mi dispiace, non 10.7.5 circa).

  • FreeNAS (FreeBSD 8.2-RELEASE-p1)

    (Laversionedell'OPèFreeBSD8.2-RELEASE-p7-Nonsonoriuscitoatrovarelastessaversione.)

  • UnfilesystemNASin/mnt/raid:

  • Un utente chiamato netboot :

  • UnfilesystemAFP(/mnt/raid/netboot)esportatocomenetboot:

    (Si noti che è configurato in sola lettura).

  • Un filesystem NFS (stesso percorso del filesystem AFP, per abbinare la configurazione dell'OP: /mnt/raid/netboot ):

AFPfunziona,NFSnon

HomontatoilfilesystemdisolaletturaAFPcomeutentenetbootusandoilFindercon⌘K:

e ha montato un file immagine DMG senza problemi: 

$ sudo rm /private/var/netboot/Library-Shadow
$ sudo /usr/bin/hdiutil attach /Volumes/netboot/p7zip-9.04-0.i386.dmg -notremovable -shadow /private/var/netboot/Library-Shadow -owners on -noverify -noautofsck -nobrowse
Password:
/dev/disk3              Apple_partition_scheme          
/dev/disk3s1            Apple_partition_map             
/dev/disk3s2            Apple_HFS                       /Volumes/p7zip.pkg

Poi l'ho smontato e montato il filesystem NFS di sola lettura (ho usato anche ⌘ K ) e non ho potuto montare il file immagine DMG.

Penso che il problema sia registrato qui: 

CBSDBackingStore::setPermission: opening /Volumes/netboot/Lion.nbi/Library.dmg
CBSDBackingStore::OpenLockFriendly: mapping flags 0x00000000 -> 0x00000014 (locks are MANDATORY)
CBSDBackingStore:OpenLockFriendly: could not open with lock 30

Errore 30 significa (vedi man 2 intro ):

30 EROFS Read-only file system. An attempt was made to modify a file or directory was made on a file system that was read-only at the time.

Non è una sorpresa qui, è davvero un filesystem di sola lettura, ma ... quando montato su AFP funziona, perché?

Poiché l'implementazione NFS di Apple ha alcuni problemi con il blocco. Come indicato in questo post su gluster.org:

OS X does a phenominal amount of file locking (some would say, needlessly so) and has always been really sensitive to the configuration of locking on the NFS servers. So much so that if you randomly pick an NFS server in a large enterprise, true success is pretty unlikely.

Nella mia configurazione, il server NFS (ovvero, la VM FreeNAS) era improvvisamente irresponsivo (dal mio /var/log/system.log del mio Mac): 

Mar 15 15:35:04 avallone.local rpc.lockd[8119]: Lockd got unexpected signal 20
Mar 15 15:35:04 avallone com.apple.launchd[1] (com.apple.lockd[8119]): Exited with code: 1
Mar 15 15:35:04 avallone com.apple.launchd[1] (com.apple.lockd): Throttling respawn: Will start in 10 seconds
(...)
Mar 15 15:35:07 avallone com.apple.launchd[1] (com.apple.statd[8121]): Exited with code: 1
Mar 15 15:35:07 avallone com.apple.launchd[1] (com.apple.statd): Throttling respawn: Will start in 10 seconds
Mar 15 15:35:13 avallone kernel[0]: nfs server 172.16.54.186:/mnt/raid/netboot: lockd not responding
Mar 15 15:35:13 avallone.local KernelEventAgent[72]: tid 00000000 received event(s) VQ_NOTRESP (1)
Mar 15 15:35:13 avallone.local KernelEventAgent[72]: tid 00000000 type 'nfs', mounted on '/Volumes/netboot', from '172.16.54.186:/mnt/raid/netboot', not responding
(...)
Mar 15 15:35:34 avallone.local KernelEventAgent[72]: tid 00000000 unmounting 1 filesystems

L'output di sudo /usr/bin/hdiutil attach -debug /Volumes/netboot/p7zip-9.04-0.i386.dmg -notremovable -shadow /private/var/netboot/Library-Shadow -owners on -noverify -noautofsck -nobrowse era: 

CBSDBackingStore::setPermission: opening /Volumes/netboot/p7zip-9.04-0.i386.dmg
CBSDBackingStore::OpenLockFriendly: mapping flags 0x00000000 -> 0x00000014 (locks are MANDATORY)
CBSDBackingStore:OpenLockFriendly: could not open with lock 5

Errore 5 significa (di nuovo da man 2 intro ):

5 EIO Input/output error. Some physical input or output error occurred. This error will not be reported until a subsequent operation on the same file descriptor and may be lost (over written) by any subsequent errors.

che non è affatto sorprendente, il file system NFS era sparito.

Soluzione

Una soluzione alternativa (testata su OS X 10.8) consiste nel montare NFS con opzioni nolocks,locallocks . Come spiegato nel post di gluster.org già citato:

Fortunately, there is a fix: just turn off network locking. You can do it by adding the "nolocks,locallocks" options in the advanced options field of the Disk Utility NFS mounting UI, but this is painful if you do a lot of them, and doesn't help at all with /net. You can edit /etc/auto_master to add these options to the /net entry, but it doesn't affect other mounts - however I do recommend deleting the hidefromfinder option in auto_master. If you want to fix every automount, edit /etc/autofs.conf and search for the line that starts with AUTOMOUNTD_MNTOPTS=. These options get applied on every mount. Add nolocks,locallocks and your world will be faster and happier after you reboot.

Ho montato manualmente 172.16.54.186:/mnt/raid/netboot e ha funzionato in modo impeccabile: 

$ sudo rm /private/var/netboot/Library-Shadow
$ sudo mount -o nolocks,locallocks,ro 172.16.54.186:/mnt/raid/netboot /tmp/mnt
$ sudo /usr/bin/hdiutil attach /tmp/mnt/p7zip-9.04-0.i386.dmg -notremovable -shadow /private/var/netboot/Library-Shadow -owners on -noverify -noautofsck -nobrowse
/dev/disk6              Apple_partition_scheme          
/dev/disk6s1            Apple_partition_map             
/dev/disk6s2            Apple_HFS                       /Volumes/p7zip.pkg

Ho anche modificato /etc/auto_master in questo modo: 

+auto_master # Use directory service
#/net             -hosts    -nobrowse,hidefromfinder,nosuid
/net              -hosts    -nosuid,nolocks,locallocks
/home             auto_home -nobrowse,hidefromfinder
/Network/Servers  -fstab
/-                -static

fermato e avviato automountd e autofsd : 

$ sudo launchctl unload /System/Library/LaunchDaemons/com.apple.automountd.plist 
$ sudo launchctl unload /System/Library/LaunchDaemons/com.apple.autofsd.plist 
$ sudo launchctl load /System/Library/LaunchDaemons/com.apple.autofsd.plist 
$ sudo launchctl load /System/Library/LaunchDaemons/com.apple.automountd.plist

e ha funzionato come un fascino: 

$ cd /net/172.16.54.186/mnt/raid/netboot
$ ls 
Network Trash Folder  Temporary Items  p7zip-9.04-0.i386.dmg
$ sudo rm /private/var/netboot/Library-Shadow
$ sudo /usr/bin/hdiutil attach p7zip-9.04-0.i386.dmg -notremovable -shadow /private/var/netboot/Library-Shadow -owners on -noverify -noautofsck -nobrowse
/dev/disk7              Apple_partition_scheme          
/dev/disk7s1            Apple_partition_map             
/dev/disk7s2            Apple_HFS                       /Volumes/p7zip.pkg
    
risposta data 15.03.2013 - 17:16
fonte
-1

hdiutil attach -readonly ...

Per un'immagine memorizzata su un file system di sola lettura, suppongo che -readonly debba essere usato al momento dell'allegato.

(Il caso AFP potrebbe essere eccezionale.)

Considerando il voto negativo e il commento di @Josh: ho frainteso la parte -shadow della pagina man per hdiutil :

… allows read-only images to be attached read/write …

- Ho immaginato che -shadow possa sovrascrivere -readonly .

    
risposta data 17.03.2013 - 16:48
fonte

Leggi altre domande sui tag

NTFS-3G smonta le partizioni NTFS perché "non ha ricevuto il segnale in 15 secondi" - che segnale? Perché l'icona della cartella sul mio terminale ha un punto interrogativo sovrapposto?