Usage : iphybun [-h] -R resource collection ... 
iphybun allows system admin to physically bundle files in a collection into
a number of tar files to make it more efficient to store these files on tape.
The tar files are placed into the /myZone/bundle/.... collection with file
names - collection.aRandomNumber. A new tar file will be created whenever
the number of subfiles exceeds 512 or the total size of the subfiles
exceeds 4 GBytes. A replica is registered for each bundled sub-files with
a fictitious resource - 'bundleResc' and a physical file path pointing to
the logical path of the tar bundle file. Whenever this copy of the subfile
is accessed, the tar file is untarred and stages to the 'cache' resource
Each extracted file is registered as a replica of its corresponding subfiles.
 
A tar bundle file can be replicated or trimmed independently from its
corresponding subfiles. But it cannot be renamed or moved to trash.
It can be removed with the 'irm -f' command. But this  will trigger the 
staging of the subfiles before the tar file is removed.
The -R flag specifies the resource of the bundle tar file. This input is
mandatory. The input resource must be a 'cache' type resource or a
resource group that contains at least one 'cache' type resource.Options are:
 -R  resource - The resource where the bundle file is located
 -h  this help

Implementation:

1) add a resource class bundle
2) mqke a resource bundleResc - unix type, bundle class, localhost, /tmp vault
3) add a data type "tar bundle"
rcPhyBundleColl - input collection, resource, optional input - bundle size,
dataType = "tar bundle"
default max num files - MAX_SUB_FILE_CNT - 512, MAX_BUNDLE_SIZE = 4 gbytes

bundle file name = /myZone/bundle/collection.random
mkdir phy dir in /vault/.../collection.random
link phy files to /vault/.../collection.random/objID  
tar the collection.random to collection.random
rm phy file and register as bundleResc with phypath = /myZone/bundle/collection.random
unlink collection and content
chlRegReplica - src - srcDataObjInfo->objPath - only used for checking perm
srcDataObjInfo->dataId,srcDataObjInfo->replNum,dstDataObjInfo->rescName,
dstDataObjInfo->rescGroupName,dstDataObjInfo->filePath
IRODS_ADMIN_KW for condInput

typedef struct BunReplCache {
    rodsLong_t  dataId;
    char objPath[MAX_NAME_LEN];		/* optional for IRODS_ADMIN_KW */ 
    int srcReplNum;
    struct BunReplCache *next;
} bunReplCache_t;

typedef struct CurSubFileCond {
    char collName[MAX_NAME_LEN];
    char dataName[MAX_NAME_LEN];
    rodsLong_t dataId;
    char phyBunDir[MAX_NAME_LEN];
    char subPhyPath[MAX_NAME_LEN];
    char cachePhyPath[MAX_NAME_LEN];
    int cacheReplNum;
    rodsLong_t subFileSize;
    int bundled;
} curSubFileCond_t;

typedef struct BunReplCacheHeader {
    int numSubFiles;
    rodsLong_t subFileSize;
    bunReplCache_t *bunReplCacheHead;
} bunReplCacheHeader_t;

use 
int
tar_extract_glob(TAR *t, char *globname, char *prefix)
toextract invividual file- prefix is the dir of output file

Need to create resc_class token "bundle"

iadmin at resc_class bundle

need to create this resource:

resource name: bundleResc
resc id: 532221
zone: tempZone
type: unix file system
class: bundle
location: localhost
vault: /tmp

admin mkresc bundleResc "unix file system" bundle localhost /tmp