problem with double cygwin install to different directory

[kou1okada]

problem with double cygwin install to different directory

[kou1okada]

Hmm, this problem, multiple installation of cygwin, is a little complexity.
I received this issue and read following source code of setup.exe:
https://sourceware.org/git/gitweb.cgi?p=cygwin-setup.git

It seems that setup.rc and root directory will be determined following steps:

1. Try to read "file://" + cwd + "/" + "setup.rc" at UserSettings.cc line 70-75.
2. If step 1 failed, then try to read "cygfile:///etc/setup/" + "setup.rc" at UserSettings.cc line 76-81. In this case, "cygfile:///" will be determined by cygpath(), but at this stage set_root_dir() has been never called. So read_mounts(std::string()) determines rootdir with HKEY_LOCAL_MACHINE\SOFTWARE\cygwin\setup\rootdir or HKEY_CURRENT_USER\Software\cygwin\setup\rootdir at mount.cc line 330-360. Note that HKEY_LOCAL_MACHINE takes priority.
3. When Cygwin setup - Choose Installation Directory dialog displayed, it will determine initial value for root directory with --root option or HKEY_LOCAL_MACHINE\SOFTWARE\cygwin\setup\rootdir or HKEY_CURRENT_USER\Software\cygwin\setup\rootdir at root.cc line 260-260. But this will be not used for reading setup.rc.

As you can see in the above steps, setup.rc seems to be read only once at step 1 or 2 before root directory is determined at step 3.
This should make some troubles in the case as multiple installation of cygwin.

Even more unfortunately the current version of setup.exe has no command line options for giving the location of setup.rc.

Perhaps, the means for giving setup.rc to setup.exe, which we can take, is following, maybe:

• Prepare ./setup.rc in the same directory as setup.exe.
• Rewrite HKEY_LOCAL_MACHINE\SOFTWARE\cygwin\setup\rootdir or HKEY_CURRENT_USER\Software\cygwin\setup\rootdir.

[kou1okada]

Please check above commit c3b4d00 on issue-47 branch.

[kou1okada]

I updated issue-47 branch with 305947b.
Can you try it?