On Gitlab, how to compare a file of two different commits

Question

On Gitlab, how to compare a file of two different commits? I know that that on command line git, the command is:

git diff commit1 commit12 -- file_name


        

Answer 1

It appears the direct URL for compare is as follows

# compare URL, where ref_source and ref_target can be commit SHA, tag, or branch
https://${gitlab_host}/${repo_path}/compare/${ref_target}...${ref_source}

# tag example 1, comparing tag v1.5.1 to master
https://${gitlab_host}/${repo_path}/compare/v1.5.1...master

# tag example 2, comparing tag v1.5.1 to tag v1.5.2
https://${gitlab_host}/${repo_path}/compare/v1.5.1...v1.5.2

# commit example 1, comparing commit SHA to master
https://${gitlab_host}/${repo_path}/compare/f6098082f...master

# commit example 2, comparing commit SHA to another commit SHA
https://${gitlab_host}/${repo_path}/compare/f6098082f...2b8daf28

To compare a single file across two commits, one needs to get a blob id of the file first, and append it to the compare url following a octothorp (#); gotta find a way to get that id though

# compare URL, where ref_source and ref_target can be commit SHA, tag, or branch, and file_blob
https://${gitlab_host}/${repo_path}/compare/${ref_target}...${ref_source}#${file_blob}