{"record":{"id":"2cba7fe1535caa59","repo":"pcottle/learnGitBranching","slug":"git-pull-can-not-be-executed-in-detached-head-mode","errorCode":null,"errorMessage":"Git pull can not be executed in detached HEAD mode if no remote branch specified!","messagePattern":"Git pull can not be executed in detached HEAD mode if no remote branch specified!","errorType":"exception","errorClass":"GitError","httpStatus":null,"severity":"error","filePath":"src/js/git/commands.js","lineNumber":309,"sourceCode":"          force = true;\n          firstArg = firstArg.substr(1);\n        }\n        var refspecParts = firstArg.split(':');\n        source = refspecParts[0];\n        assertRefNoModifiers(source);\n        destination = validateBranchNameIfNeeded(\n          engine,\n          crappyUnescape(refspecParts[1])\n        );\n        assertNotCheckedOut(engine, destination);\n      } else if (firstArg) {\n        source = firstArg;\n        assertIsBranch(engine.origin, source);\n        // get o/main locally if main is specified\n      } else {\n        // can't be detached\n        if (engine.getDetachedHead()) {\n          throw new GitError({\n            msg: intl.todo('Git pull can not be executed in detached HEAD mode if no remote branch specified!')\n          });\n        }\n        // ok we need to get our currently checked out branch\n        // and then specify source and dest\n        var branch = engine.getOneBeforeCommit('HEAD');\n        var branchName = branch.get('id');\n        assertBranchIsRemoteTracking(engine, branchName);\n        source = branch.getRemoteTrackingBranchID().replace(ORIGIN_PREFIX, '');\n      }\n\n      engine.pull({\n        source: source,\n        destination: destination,\n        force: force,\n        isRebase: !!commandOptions['--rebase']\n      });\n    }","sourceCodeStart":291,"sourceCodeEnd":327,"githubUrl":"https://github.com/pcottle/learnGitBranching/blob/5b09d0ff9678cad164f5a7488a279a44f90d7256/src/js/git/commands.js#L291-L327","documentation":"git pull with no source refspec needs the current branch to determine what to pull; with a detached HEAD there is no branch, so the command aborts with this intl.todo message.","triggerScenarios":"git checkout <sha> (detached HEAD) then git pull with no branch argument.","commonSituations":"Inspecting an old commit then pulling out of habit; scripts that pull after checking out a SHA.","solutions":["Specify a source: git pull origin main","Reattach HEAD first: git checkout main, then git pull"],"exampleFix":"// before\ngit checkout C3; git pull\n// after\ngit checkout C3; git pull origin main","handlingStrategy":"validation","validationCode":"if (engine.getDetachedHead() && !generalArgs.length) { require explicit source ref }","typeGuard":"function safeToPull(engine, args) { return !engine.getDetachedHead() || args.length > 0; }","tryCatchPattern":null,"preventionTips":["Always pull with explicit refspec when detached","Reattach HEAD before pull in scripts"],"tags":["git","pull","detached-head"],"backgroundTag":"detached-head-operation","analyzedSha":"5b09d0ff9678cad164f5a7488a279a44f90d7256","analyzedAt":"2026-08-27T13:53:49.057Z","schemaVersion":2},"datasetVersion":"2026-08-27T19:17:21.184Z"}