scr: new release and dependency updates (#23378)

SCR moved to a component version some time ago, but never had a
release associated with these changes. SCR v2 is a legacy version
that is no longer being developed/supported. In preparation for an
upcoming SCR v3 release, there is now a 3.0rc1 release available to
users.
This adds the 3.0rc1 release to the spack package and deprecates the
older versions.

Additional changes include:
- Enforce using the main branches of the components when installing
scr@develop
- Enforce SCR v3 uses at least the recently released versions of each
of the components
- Use a simple `detect_scheduler()` function in an attempt to be
smarter about setting the default resource manager and not require
users to always manually provide the variant
- Add/update variants that were recently added to AXL and KVTree
components
- Fix cmake arg naming bug of setting `SCR_CONFIG_FILE`
- `SCR_ASYNC_API` is now being handled by a component and is only
needed by the legacy versions.

var/spack/repos/builtin/packages/scr/package.py

@@ -11,6 +11,14 @@
 import sys
 
 
+def detect_scheduler():
+    if which('aprun'):
+        return 'APRUN'
+    if which('jsrun'):
+        return 'LSF'
+    return 'SLURM'
+
+
 class Scr(CMakePackage):
     """SCR caches checkpoint data in storage on the compute nodes of a
        Linux cluster to provide a fast, scalable checkpoint/restart
@@ -21,33 +29,36 @@ class Scr(CMakePackage):
     git      = "https://github.com/llnl/scr.git"
 
     version('develop', branch='develop')
-    version('legacy', branch='legacy')
+    version('legacy', branch='legacy', deprecated=True)
 
-    version('2.0.0', sha256='471978ae0afb56a20847d3989b994fbd680d1dea21e77a5a46a964b6e3deed6b')
+    version('3.0rc1', sha256='bd31548a986f050024429d8ee3644eb135f047f98a3d503a40c5bd4a85291308')
-    version('1.2.2', sha256='764a85638a9e8762667ec1f39fa5f7da7496fca78de379a22198607b3e027847')
+    version('2.0.0', sha256='471978ae0afb56a20847d3989b994fbd680d1dea21e77a5a46a964b6e3deed6b', deprecated=True)
-    version('1.2.1', sha256='23acab2dc7203e9514455a5168f2fd57bc590affb7a1876912b58201513628fe')
+    version('1.2.2', sha256='764a85638a9e8762667ec1f39fa5f7da7496fca78de379a22198607b3e027847', deprecated=True)
-    version('1.2.0', sha256='e3338ab2fa6e9332d2326c59092b584949a083a876adf5a19d4d5c7a1bbae047')
+    version('1.2.1', sha256='23acab2dc7203e9514455a5168f2fd57bc590affb7a1876912b58201513628fe', deprecated=True)
+    version('1.2.0', sha256='e3338ab2fa6e9332d2326c59092b584949a083a876adf5a19d4d5c7a1bbae047', deprecated=True)
 
     depends_on('pdsh+static_modules', type=('build', 'run'))
     depends_on('zlib')
     depends_on('mpi')
 
-    # As of mid-2020, develop requires the "master" branch
+    # Use the latest iteration of the components when installing scr@develop
-    # of a few component libraries
     depends_on('axl@master',      when="@develop")
-    depends_on('kvtree@master', when="@develop")
-    depends_on('redset@master', when="@develop")
     depends_on('er@master',       when="@develop")
+    depends_on('kvtree@master',   when="@develop")
     depends_on('rankstr@master',  when="@develop")
+    depends_on('redset@master',   when="@develop")
     depends_on('shuffile@master', when="@develop")
+    depends_on('spath@master',    when="@develop")
 
     # SCR legacy is anything 2.x.x or earlier
     # SCR components is anything 3.x.x or later
-    depends_on('er', when="@3:")
+    depends_on('axl@0.4.0:',      when="@3:")
-    depends_on('kvtree', when="@3:")
+    depends_on('er@0.0.4:',       when="@3:")
-    depends_on('rankstr', when="@3:")
+    depends_on('kvtree@1.1.1:',   when="@3:")
-    depends_on('filo', when="@3")
+    depends_on('rankstr@0.0.3:',  when="@3:")
-    depends_on('spath', when="@3:")
+    depends_on('redset@0.0.5:',   when="@3:")
+    depends_on('shuffile@0.0.4:', when="@3:")
+    depends_on('spath@0.0.2:',    when="@3:")
 
     # DTCMP is an optional dependency up until 3.x
     variant('dtcmp', default=True,
@@ -65,7 +76,7 @@ class Scr(CMakePackage):
     depends_on('libyogrt scheduler=lsf', when="+libyogrt resource_manager=LSF")
     depends_on('libyogrt', when="+libyogrt")
 
-    # MySQL not yet in spack
+    # Enabling SCR logging is a WIP, for which this will be needed
     # variant('mysql', default=True, decription="MySQL database for logging")
     # depends_on('mysql', when="+mysql")
 
@@ -79,20 +90,29 @@ class Scr(CMakePackage):
     variant('fortran', default=True,
             description="Build SCR with fortran bindings")
 
-    variant('resource_manager', default='SLURM',
+    variant('resource_manager', default=detect_scheduler(),
             values=('SLURM', 'APRUN', 'PMIX', 'LSF', 'NONE'),
             multi=False,
             description="Resource manager for which to configure SCR.")
 
+    # SCR_ASYNC_API in process of being automated. Only applying this to :2.x.x
     variant('async_api', default='NONE',
             values=('NONE', 'CRAY_DW', 'IBM_BBAPI', 'INTEL_CPPR'),
             multi=False,
             description="Asynchronous data transfer API to use with SCR.")
 
+    variant('bbapi_fallback', default='False',
+            description='Using BBAPI, if source or destination don\'t support \
+            file extents then fallback to pthreads')
+    depends_on('axl+bbapi_fallback', when="@3: +bbapi_fallback")
+
     variant('file_lock', default='FLOCK',
             values=('FLOCK', 'FNCTL', 'NONE'),
             multi=False,
             description='File locking style for SCR.')
+    depends_on('kvtree file_lock=FLOCK', when='@3: file_lock=FLOCK')
+    depends_on('kvtree file_lock=FNCTL', when='@3: file_lock=FNCTL')
+    depends_on('kvtree file_lock=NONE',  when='@3: file_lock=NONE')
 
     # The default cache and control directories should be placed in tmpfs if available.
     # On Linux, /dev/shm is a common tmpfs location.  Other platforms, like macOS,
@@ -121,12 +141,13 @@ def cmake_args(self):
 
         conf_path = self.get_abs_path_rel_prefix(
             self.spec.variants['scr_config'].value)
-        args.append('-DCMAKE_SCR_CONFIG_FILE={0}'.format(conf_path))
+        args.append('-DSCR_CONFIG_FILE={0}'.format(conf_path))
 
         # We uppercase the values for these to avoid unnecessary user error.
         args.append('-DSCR_RESOURCE_MANAGER={0}'.format(
             spec.variants['resource_manager'].value.upper()))
 
+        if spec.satisfies('@:2.999'):
             args.append('-DSCR_ASYNC_API={0}'.format(
                 spec.variants['async_api'].value.upper()))