hash

问题 This has been surprisingly confusing for me. I thought Docker's Image ID is its SHA256 hash. However, apparently the result from docker image ls --digests (listed under the column header DIGEST ) is different from the IMAGE ID of that image. For example docker image ls --digests alpine REPOSITORY TAG DIGEST IMAGE ID CREATED SIZE alpine latest sha256:769fddc7cc2f0a1c35abb2f91432e8beecf83916c421420e6a6da9f8975464b6 055936d39205 2 weeks ago 5.53MB while docker image ls --no-trunc REPOSITORY TAG

问题 This has been surprisingly confusing for me. I thought Docker's Image ID is its SHA256 hash. However, apparently the result from docker image ls --digests (listed under the column header DIGEST ) is different from the IMAGE ID of that image. For example docker image ls --digests alpine REPOSITORY TAG DIGEST IMAGE ID CREATED SIZE alpine latest sha256:769fddc7cc2f0a1c35abb2f91432e8beecf83916c421420e6a6da9f8975464b6 055936d39205 2 weeks ago 5.53MB while docker image ls --no-trunc REPOSITORY TAG

问题 This has been surprisingly confusing for me. I thought Docker's Image ID is its SHA256 hash. However, apparently the result from docker image ls --digests (listed under the column header DIGEST ) is different from the IMAGE ID of that image. For example docker image ls --digests alpine REPOSITORY TAG DIGEST IMAGE ID CREATED SIZE alpine latest sha256:769fddc7cc2f0a1c35abb2f91432e8beecf83916c421420e6a6da9f8975464b6 055936d39205 2 weeks ago 5.53MB while docker image ls --no-trunc REPOSITORY TAG

问题 Can someone look at my two functions below and suggest what I can do? I have created two functions that basically creates a unique key and this is echoed in a hidden field in a form and then straight after I check if the form has been submitted the second function checks to see if the key in the hidden field matches the key in the session. The problem I am having is now and again it just redirects me to to the forbidden page suggesting the keys don't match although I have not edited the form

问题 Can someone look at my two functions below and suggest what I can do? I have created two functions that basically creates a unique key and this is echoed in a hidden field in a form and then straight after I check if the form has been submitted the second function checks to see if the key in the hidden field matches the key in the session. The problem I am having is now and again it just redirects me to to the forbidden page suggesting the keys don't match although I have not edited the form

问题 In some cases and some code I saw that hashValue is used to convert Bool to Int . However, the code let someValue = true let someOtherValue = false print(someValue.hashValue) print(someOtherValue.hashValue) gets me the output -5519895559129191040 7814522403520016984 I would expect 1 and 0 , though. I use XCode 10.0 beta 2 (10L177m), MacOS High Sierra with Swift 4.2. I can switch to Swift 4.0 to gain likewise results. Now, is there something I do wrong or is hashValue no reliable conversion

问题 In some cases and some code I saw that hashValue is used to convert Bool to Int . However, the code let someValue = true let someOtherValue = false print(someValue.hashValue) print(someOtherValue.hashValue) gets me the output -5519895559129191040 7814522403520016984 I would expect 1 and 0 , though. I use XCode 10.0 beta 2 (10L177m), MacOS High Sierra with Swift 4.2. I can switch to Swift 4.0 to gain likewise results. Now, is there something I do wrong or is hashValue no reliable conversion

问题 Git allows to retrieve the hash of the commit with commands like: git rev-parse HEAD which gives 33b316c or git rev-parse --short HEAD which gives 33b316cbeeab3d69e79b9fb659414af4e7829a32 I know that long hashes in practice will never collide. In practice, the short hashes are used much more often. I'd like to know what's the probability for the short ones to collide? Does git take any measures to overcome possible collisions (when for example using git checkout )? 回答1: I give a formula in my

问题 Git allows to retrieve the hash of the commit with commands like: git rev-parse HEAD which gives 33b316c or git rev-parse --short HEAD which gives 33b316cbeeab3d69e79b9fb659414af4e7829a32 I know that long hashes in practice will never collide. In practice, the short hashes are used much more often. I'd like to know what's the probability for the short ones to collide? Does git take any measures to overcome possible collisions (when for example using git checkout )? 回答1: I give a formula in my

问题 Git allows to retrieve the hash of the commit with commands like: git rev-parse HEAD which gives 33b316c or git rev-parse --short HEAD which gives 33b316cbeeab3d69e79b9fb659414af4e7829a32 I know that long hashes in practice will never collide. In practice, the short hashes are used much more often. I'd like to know what's the probability for the short ones to collide? Does git take any measures to overcome possible collisions (when for example using git checkout )? 回答1: I give a formula in my