Mon, 1 Feb 2016 22:50:58 +0100 Den 01. feb. 2016 21:35, skrev Daniel Hokka Zakrisson: Tor Rune Skoglund wrote: >> One further question relating to hashify: >> >> How is the hash value created ? What is it based on? - Just the file >> contents, or (some of - which?) file metadata also? > File metadata including mode, uid, gid, rdev, size, and mtime is also > included. The entirety of the file is used. > >> I have a strange test case here where two binary equal files in the same >> file system, same name, same locations but in two guest did not get >> hashified to the same hash value, and I an trying to understand why? > Could you also post the result of stat on the two files? Almost needless to say, your answer explains the cause perfectly. The mtimes are different, creating a different hash for the files: amd64 part4 # stat ./vservers/machine96/usr/bin/bc File: «./vservers/machine96/usr/bin/bc» Size: 84952 Blocks: 176 IO Block: 4096 vanlig fil Device: 804h/2052d Inode: 2525495 Links: 2 Access: (0755/-rwxr-xr-x) Uid: ( 0/ root) Gid: ( 0/ root) Access: 2016-01-26 18:36:24.000000000 +0100 Modify: 2016-01-26 18:36:24.000000000 +0100 Change: 2016-01-26 19:46:38.000000000 +0100 Birth: - amd64 part4 # stat ./vservers/machine95/usr/bin/bc File: «./vservers/machine95/usr/bin/bc» Size: 84952 Blocks: 176 IO Block: 4096 vanlig fil Device: 804h/2052d Inode: 2205290 Links: 2 Access: (0755/-rwxr-xr-x) Uid: ( 0/ root) Gid: ( 0/ root) Access: 2016-01-26 18:36:21.000000000 +0100 Modify: 2016-01-26 18:36:21.000000000 +0100 Change: 2016-01-26 19:46:10.000000000 +0100 Birth: - So in the case where one does not care about/use any of the times values for a file, one could first "time-syncronize" any files that have equal contents and are having similar (other) meta data before running hashify, I presume. Thanks! :-) BR, Tor Rune Skoglund > Best regards, > Daniel > >> amd64 part4 # ls -il vservers/machine95/usr/bin/bc >> 2205290 -rwxr-xr-x 2 root root 84952 jan. 26 18:36 >> vservers/machine95/usr/bin/bc >> >> amd64 part4 # ls -il vservers/machine96/usr/bin/bc >> 2525495 -rwxr-xr-x 2 root root 84952 jan. 26 18:36 >> vservers/machine96/usr/bin/bc >> >> amd64 part4 # find . -inum 2205290 >> ./vservers/machine95/usr/bin/bc >> ./hashfilesstore/33/7b/6e544172a896550e582becb191d55df1713a-00000000 >> >> amd64 part4 # find . -inum 2525495 >> ./vservers/machine96/usr/bin/bc >> ./hashfilesstore/f2/ec/4d721c12734000a00253c0ce2708fda82203-00000000 >> >> amd64 part4 # md5sum ./vservers/machine96/usr/bin/bc >> 29ad08e28e17cb179328103c9835d495 ./vservers/machine96/usr/bin/bc >> >> amd64 part4 # md5sum ./vservers/machine95/usr/bin/bc >> 29ad08e28e17cb179328103c9835d495 ./vservers/machine95/usr/bin/bc >> >> BR, >> Tor Rune Skoglund, trs@swi.no >> >> >>