hackage-repo-tool bootstrap fails in a mysterious way if there are no tarballs

[ezyang]

Steps to reproduce:

1. Run hackage-repo-tool bootstrap on a directory that doesn't exist. Get:

ezyang@sabre:~/Dev/labs/localrepo$ /srv/code/hackage-security/dist-newstyle/build/x86_64-linux/ghc-7.10.3/hackage-repo-tool-0.1.1/c/hackage-repo-tool/build/hackage-repo-tool/hackage-repo-tool bootstrap --keys keys --repo repo
/srv/code/labs/localrepo/repo: getDirectoryContents: does not exist (No such file or directory)

2. Create the directory and try again.

ezyang@sabre:~/Dev/labs/localrepo$ /srv/code/hackage-security/dist-newstyle/build/x86_64-linux/ghc-7.10.3/hackage-repo-tool-0.1.1/c/hackage-repo-tool/build/hackage-repo-tool/hackage-repo-tool bootstrap --keys keys --repo repo
/srv/code/labs/localrepo/repo/index: getDirectoryContents: does not exist (No such file or directory)

3. Create the directory and try again

ezyang@sabre:~/Dev/labs/localrepo$ /srv/code/hackage-security/dist-newstyle/build/x86_64-linux/ghc-7.10.3/hackage-repo-tool-0.1.1/c/hackage-repo-tool/build/hackage-repo-tool/hackage-repo-tool bootstrap --keys keys --repo repo
/srv/code/labs/localrepo/repo/01-index.tar: openBinaryFile: does not exist (No such file or directory)

That last error is incredibly oblique. You can solve it by adding a tarball to the package subdir. Totally non-obvious.

[nomeata]

Just stumbled over this. A helpful error message (please create a package subdirectory with tarballs in it) would have been useful.

[hvr]

@nomeata patches welcome! I briefly looked at this some time ago, but had to give up due to lack of time

[nomeata]

I was worried someone would say that ;-)