> On Jan 1, 2015, at 1:22 PM, Bjørn Forsman <[email protected]> wrote: > > On 31 December 2014 at 17:50, Rico Huijbers <[email protected]> wrote: >> Hi, >> >> When I copy/paste a fetchgit block from another file, and change the URL and >> rev without changing the hash, I expect the download to fail (and tell me >> the hash). >> >> However, what actually happens is that fetchgit just looks at the hash, sees >> that *something* with that hash has already been downloaded, and happily >> proceeds with the rest of the script using the wrong source files. Now I >> have to go and do nix-prefetch-git every time. >> >> Shouldn’t fetchgit build the hash from URL and rev, as opposed to the >> provided hash? Or am I doing it wrong? > > AFAIK, it's the nixos hashed mirror that creates this behaviour. > fetchgit itself will re-download if the _basename_ of the URL changes, > but when the hashed mirror has a file with the given hash, it is > downloaded instead. > > So it's the hashed mirror that needs to take the basename of URL into account. >
No, the hashed mirror causes this for fetchurl, but for fetchgit the drv name is always “git-export” so even without the hashed mirror this is true (same output hash + same drv name = same output path). > Best regards, > Bjørn Forsman > _______________________________________________ > nix-dev mailing list > [email protected] > http://lists.science.uu.nl/mailman/listinfo/nix-dev _______________________________________________ nix-dev mailing list [email protected] http://lists.science.uu.nl/mailman/listinfo/nix-dev
