We have an embedded resource and need to get the md5 hash of the file before extracting it in order to know if it is different from an already existing file, (becouse if we have to extract it to compare them it would be better to replace the file directly)
Any suggestion is appreciated
I have several files on a server that I need to download from an
ansible playbook, but because the connection has good chances of interruption I would like to check their integrity after download.
I'm considering two approaches:
The first approach introduces overhead in maintaining the md5s in ansible. So everytime someone adds a new file, he needs to make sure he adds the md5 in the right place.
But as an advantage, there is a solution for this, using the built in check from
get_url action in conjunction with
action: get_url: url=http://example.com/path/file.conf dest=/etc/foo.conf checksum=md5:66dffb5228a211e61d6d7ef4a86f5758
The second approach is more elegant and the narrows the responsibility. When someone adds a new file on the server, he will make sure to add the
.md5 as well and won't even need to use the ansible playbooks.
Is there a way to use the
checksum approach to match the md5 from a file?
I have used hashlib (which replaces md5 in Python 2.6/3.0) and it worked fine if I opened a file and put its content in
The problem is with very big files that their sizes could exceed RAM size.
How to get the MD5 hash of a file without loading the whole file to memory?
This question already has an answer here:
I am writing an app that will be sending thousands of large images to the Google Cloud Vision api.This is an expensive and time-consuming process so I want to record the results in a database so that if I run the application again I can just get the results from the database rather than waiting for google again.
Currently I am using an Md5 hash of the image and using that as a key to store the results in the database. If the same image is hashed then I can just pull the results out of the DB.
Will this work though? I assume that it is possible (but unlikely) that different images will produce the same hash.
How likely is this to happen? I assume there's no way of preventing this.
An MD5 that was generated was
82e78c07235be5015f4d916fa0a126a3 - that is significantly smaller than the 4MB file that produced it so it must be possible to get duplicates.
I need to do an update query making an md5 hash from my google calendar column. This is my query:
UPDATE `ea_appointments` SET `hash` = MD5(`id_google_calendar`)
Would this work to make something like this?:
Table: ea_appointmentsid_google_calendar Hashe5e3were760lkj792c7t5vm61bvk_20160729T200000Z d5f9f4ef02e438d49c8bf39cd4b4118d