[Git] Git Reflog

Git Reflog

• Reflog
• Reflog References
• Rescuing Lost Commits

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Reflog

• Reflog is a record of when the tip of branches and other references were updated in the repository.
• The logs are stored in the .git/logs/HEAD file
• Limitation
  • Git only keeps the reflogs of the local repostiory
  • Git cleans the old entries after around 90 days by default

# see the logs
git reflog
# see git reflog show {reference}
git reflog show feat:reference

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Reflog References

• name@{qualifier}

# where HEAD was 2 moves ago
git checkout HEAD@{2} 
# git checkout HEAD~2 # 2 commits ago
# HEAD involves more than just commits(e.g. checkout)

# difference between current HEAD and HEAD 2 moves ago
git diff HEAD@{0} HEAD@{2}

# timestamp reference
git reflog show HEAD@{two.years.ago}
git reflog show HEAD@{one.year.ago}
git reflog show HEAD@{two.months.ago}
git reflog show HEAD@{one.month.ago}
git reflog show HEAD@{two.weeks.ago}
git reflog show HEAD@{one.week.ago}
git reflog show HEAD@{yesterday}
git reflog show HEAD@{two.minutes.ago}
git reflog show HEAD@{one.minute.ago}
git reflog show HEAD@{2.days.ago}
git reflog show HEAD@{two.days.ago}

git diff main@{0} main@{yesterday}
git checkout feat:v1.0.5@{2.days.ago}
git reflog mater@{one.week.ago}

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Rescuing Lost Commits

• Find the commit by using git reflog, then git reset to the commit
  • git reflog show HEAD/{branch_name}

git reset --hard master@{1}

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