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callum
callum

Reputation: 37799

Command to assert the current HEAD points to master?

I want a command that will fail (with code 1) unless the HEAD points at master.

This kind of works:

git diff master --quiet || (echo 'Not master' && false)

But it's too strict – it also fails if there are any uncommitted changes in the working tree.

How can I assert that HEAD points at master, discounting any unstaged or uncommitted changes in the working tree?

Upvotes: 2

Views: 162

Answers (3)

V G
V G

Reputation: 86

Considering that HEAD can point directly to a commit (detached head) or point to some branch that happens to match with the content of commit at the tip of master, comparing it using diff will not be 100% accurate. On the other hand, the HEAD is just a file containing a symbolic reference, according to docs, which could be compared directly.

test "$(cat "$(git rev-parse --git-path HEAD)")" == "ref: refs/heads/master"

Or

test "$(cat "$(git rev-parse --git-path HEAD)")" == "ref: refs/heads/master" && echo "HEAD points to master" || echo "HEAD does not point to master"

Upvotes: 5

haolee
haolee

Reputation: 937

Check the exit code of this command:

git branch | grep "* master"

Upvotes: 2

Anonymous
Anonymous

Reputation: 12017

You can compare with HEAD:

git diff HEAD master --quiet || (echo 'Not master' && false)

If you want to allow empty commits:

[ $(git show --oneline HEAD..master master..HEAD | wc -l) -eq 0] || (echo 'Not master' && false)

Or:

[ "$(git rev-parse HEAD)" = "$(git rev-parse master)" ] || (echo 'Not master' && false)

Upvotes: 1

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