setup takes a long time

[Fergus Daly <ugly.leper@gmail.com>]

The setup program does seem to take a long time, even when it just
means "update" and even when there's nothing to update. Here's what
happens in unattended mode:

C:\Users\User0044>D:\cyg\setup-x86.exe -L D:\cyg -R D:\consoleX -Wgqmn
Starting cygwin install, version 2.884
User has backup/restore rights
Current Directory: D:\cyg
Could not open service McShield for query, start and stop. McAfee may
not be installed, or we don't have access.
root: D:\consoleX system
Selected local directory: D:\cyg
Changing gid back to original
running: D:\consoleX\bin\dash.exe "/etc/postinstall/0p_000_autorebase.dash"
running: D:\consoleX\bin\dash.exe "/etc/postinstall/0p_texlive_prep.dash"
running: D:\consoleX\bin\dash.exe "/etc/postinstall/0p_update-info-dir.dash"
running: D:\consoleX\bin\bash.exe --norc --noprofile
"/etc/postinstall/zp_adwaita-icon-theme.sh"
running: D:\consoleX\bin\bash.exe --norc --noprofile
"/etc/postinstall/zp_desktop-file-utils.sh"
running: D:\consoleX\bin\bash.exe --norc --noprofile
"/etc/postinstall/zp_fontconfig_cache_1.sh"
running: D:\consoleX\bin\bash.exe --norc --noprofile
"/etc/postinstall/zp_glib2.0.sh"
running: D:\consoleX\bin\bash.exe --norc --noprofile
"/etc/postinstall/zp_hicolor-icon-theme.sh"
running: D:\consoleX\bin\bash.exe --norc --noprofile
"/etc/postinstall/zp_man-db.sh"
running: D:\consoleX\bin\bash.exe --norc --noprofile
"/etc/postinstall/zp_shared-mime-info.sh"
running: D:\consoleX\bin\dash.exe "/etc/postinstall/zp_texlive_finish.dash"
Changing gid to Administrators
Ending cygwin install

I can kind of see the point of autorebase and update-info-dir, but why
revisit texlive every time, and why all the zp stuff, every time? Why
does setup explore McShield and McAfee? Incidentally note the switch
-m. Without it, checking sha1sum's I guess provides some kind of
protection, but it's incredibly time-consuming and seems quite
unnecessarily to cover much more than the files downloaded, even the
entire resource? In the presumably very rare event of a broken
download, could the update not more simply just abort?

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