git-svn migration fatal: not a valid SHA1 update-ref refs/heads/master refs/remotes/trunk: command returned error: 128

Question

Trying to migrate a large but linear svn repository to git. The svn repository does not have the standard layout (trunk, branches, tags)...just one directory with the trunk.

Answer 1

Every time this happened to me Git simply couldn't fetch a commit from trunk in Subversion:

fatal: refs/remotes/trunk: not a valid SHA1

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Reasons:

• You didn't specify Subversion layout when it was not standard (trunk-tags-branches). Specifically for the error - you have no /trunk.
• You didn't fetch from revision old enough to span at least one commit into trunk (for example, using -r option).
• Combination of the above.