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robaho / seashore

easy to use mac osx image editing application for the rest of us
GNU General Public License v2.0
452 stars 20 forks source link

Corrupted file? #46

Closed Major1ty closed 5 years ago

Major1ty commented 5 years ago

I downloaded seashoredmg.dmg from the SourceForge page at https://sourceforge.net/projects/seashore/

However, attempting to open it generates a warning: "no mountable file systems"

This usually means a corrupted download, but repeating the download had no effect. Is the original corrupted at SourceForge, perhaps?

robaho commented 5 years ago

Only the old 0.x version is valid at sourceforge. The latest should open with a readme asking the user to get it from the App Store. You can download DMGs from GitHub (here) under the ‘releases’.

follower commented 5 years ago

Side note: These days a "no mountable file systems" error often means that the .dmg file was created on a version of macOS that defaults to APFS format rather than HFS+ as supported by older OS versions.

(The default disk format that hdiutil creates (silently) depends on the format of the source drive rather than being specified explicitly--which leads people to not realise they've created a non-backwards compatbile .dmg--even if the application on the disk is backwards compatible.)

I've got a few more notes here but didn't get around to documenting how it's possible to extract the files on older versions. (You can confirm the disk format without being able to open it, as a .dmg image actually has an XML document appended to the end of the file which will contain the string APFS if it uses that disk format.)

robaho commented 5 years ago

@follower Thanks. I had already corrected this - the current builds of the dmg are HFS+. I also went back and converted the 0.6.6 version to HFS+ on Sourceforge.

follower commented 5 years ago

Yeah, I didn't make clear that I'd realised you'd already remedied the situation--my primary intention was to provide some addition context for @Major1ty in case they encountered the situation again with a different project. :)

BTW, thanks for your work on "resurrecting" Seashore--I was very surprised when I got an update notification the other day! I've found it a nice lightweight & fast loading image editing tool so it's nice that it hasn't been abandoned entirely!