ghref

ghref

SHA1 for branch or tag of a GitHub repo

Context

Stack Overflow question 30815555: "Get the hash of the current HEAD of a repo using only HTTP"

Implementation

ghref uses only https calls to the GitHub API through the google/go-github Go library which only calls URLs from the GitHub V3 API.

It is a simple executable, compiled from sources in Go: no dll or dynamic library dependency.
Copy the compiled executable anywhere you want and use it.

Usage

ghref -hdv <owner>/<repo> [<branchname>|<tagname>|heads]",
      => refs from a github repo (owner/rename)

ghref displays, for a given GitHub repo, the SHA1 for a branch or a tag, or it find the default branch (remote HEAD) when no parameter is given.

By default, the output is only the SHA1 or branch name, or nothing if the repo (or branch or tag) does not exist.
That way, the ghref output can be passed to another command (batch usage)

For example, to find the SHA1 of the default branch of a repo:

     ghref git/git    | xargs  ghref git/git
    (default branch)          (sha1 of that branch)

Note: it is also copied to the clipboard. (CTRL/Command+V to paste the result)

Parameters:

• <owner>/<repo>: owner and repo name on github
• <branchname>: name of the branch, to look for its SHA1
• <tagname>: name of the tag, to look for its SHA1

Flags (posix argument convention)

• --help, -h: display this usage and exit
• --verbose, -v: if set, prints a detailed output (not for batch usage)
• --debug, -d: if set, add debug information

Installation

• get go: download go, unzip it and set GOROOT to its path
• add $GOROOT/bin to your $PATH
• then:

git clone https://github.com/VonC/ghref
cd ghref
git submodule update --init
./gb.sh

• test it with:

    bin/ghref git/git | xargs bin/ghref git/git