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When DESTDIR is a relative path, make install fails to install `scst_on_stpg` for not having created `$(DESTDIR)$(PREFIX)/bin/scst`. When DESTDIR is an absolute path, make install doesn't fail to install `scst_on_stpg` because usr/fileio has already created the directory. usr/stpgd should explicitly create `$(DESTDIR)$(PREFIX)/bin/scst` so that it can handle a relative DESTDIR, plus be independent of usr/fileio installation. -- # cd usr # make install DESTDIR=./aaa cd fileio && make install make[1]: Entering directory '/tmp/scst/usr/fileio' install -d ./aaa/usr/local/bin/scst install -m 755 fileio_tgt ./aaa/usr/local/bin/scst make[1]: Leaving directory '/tmp/scst/usr/fileio' cd stpgd && make install make[1]: Entering directory '/tmp/scst/usr/stpgd' install -d ./aaa/usr/local/sbin install -m 700 stpgd ./aaa/usr/local/sbin install -m 700 scst_on_stpg ./aaa/usr/local/bin/scst/scst_on_stpg install: cannot create regular file './aaa/usr/local/bin/scst/scst_on_stpg': No such file or directory Makefile:60: recipe for target 'install' failed make[1]: *** [install] Error 1 make[1]: Leaving directory '/tmp/scst/usr/stpgd' Makefile:32: recipe for target 'install' failed make: *** [install] Error 2 Signed-off-by: Tomohiro Kusumi <kusumi.tomohiro@osnexus.com> git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@7403 d57e44dd-8a1f-0410-8b47-8ef2f437770f
This is stpgd service called by the SCST core upon receiving SET TARGET PORT GROUPS command via SCST events subsystem. In turn, stpgd calls external script to actually modify ALUA state as requested by the SET TARGET PORT GROUPS command via cluster manager and SCST sysfs. You can find example of such script in scst_on_stpg file. Reason why such dual stage approach is used is, because there is no way from inside the kernel to control execution of external programs and there is no way to write a service calling IOCTLs on shell.