From 86de22b526313a68e5c8bb8a361d5904c30d8b51 Mon Sep 17 00:00:00 2001
From: Christopher Baines <mail@cbaines.net>
Date: Mon, 16 May 2016 22:20:12 +0100
Subject: Initial commit

---
 solver/__init__.py | 184 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 184 insertions(+)
 create mode 100644 solver/__init__.py

(limited to 'solver')

diff --git a/solver/__init__.py b/solver/__init__.py
new file mode 100644
index 0000000..0b8160a
--- /dev/null
+++ b/solver/__init__.py
@@ -0,0 +1,184 @@
+import solv
+
+OPERATOR_TO_FLAGS = {
+    "=": solv.REL_EQ,
+    "<": solv.REL_LT,
+    ">": solv.REL_GT,
+    "<=": solv.REL_EQ | solv.REL_LT,
+    ">=": solv.REL_EQ | solv.REL_GT,
+}
+
+def get_operator_and_version(spec):
+    spec.strip()
+    for operator in OPERATOR_TO_FLAGS.keys():
+        if spec.startswith(operator):
+            version = spec[len(operator):].strip()
+
+            return operator, version
+
+    raise Exception("Could not parse %s" % spec)
+
+def get_versions_or_error(sdists, overall_requirements, debug=False):
+    def log(*args):
+        if debug:
+            print(args)
+
+    if sdists is None or (len(sdists) == 1 and sdists[0] is None):
+        sdists = []
+
+    if overall_requirements is None or (
+        len(overall_requirements) == 1 and overall_requirements[0] is None
+    ):
+        overall_requirements = []
+
+    if len(overall_requirements) == 0:
+        log("overall_requirements", overall_requirements)
+        return []
+
+    log(sdists)
+    log(overall_requirements)
+
+    pool = solv.Pool()
+    pool.setarch()
+
+    sysrepo = pool.add_repo("@System")
+
+    repo = pool.add_repo("test")
+    repo.create_stubs()
+
+    solvables = {}
+
+    log("Creating solvables")
+    for name, version, requirements in sdists:
+        solvable = repo.add_solvable()
+
+        solvable.name = name
+        solvable.evr = version
+        solvable.arch = "noarch"
+
+        log(solvable.name, solvable.id)
+
+        solvables[(name, version)] = solvable
+
+        rel_id = pool.rel2id(
+            solvable.nameid,
+            solvable.evrid,
+            OPERATOR_TO_FLAGS["="],
+            True,
+        )
+
+        solvable.add_deparray(solv.SOLVABLE_PROVIDES, rel_id)
+
+    log("Adding requirements")
+    for name, version, requirements in sdists:
+        if requirements is None:
+            requirements = []
+
+        solvable = solvables[(name, version)]
+
+        log("requirements for", name, version)
+
+        for requirement_name, requirement_specifiers in requirements:
+            log("requirement name ", requirement_name)
+            requirement_name_id = pool.str2id(requirement_name, False)
+
+            if requirement_name_id == 0:
+                return "Could not find package for requirement %s" % requirement_name
+
+            if requirement_specifiers is None:
+                requirement_specifiers = []
+
+            log("specifiers ", requirement_specifiers)
+            if len(requirement_specifiers) == 0:
+                solvable.add_deparray(solv.SOLVABLE_REQUIRES, requirement_name_id)
+            else:
+                for spec in requirement_specifiers:
+                    if "!=" in spec:
+                        # TODO: Support this
+                        continue
+
+                    try:
+                        spec_operator, spec_version = get_operator_and_version(spec)
+                    except Exception as e:
+                        return str(e)
+
+                    requirement_evr_id = pool.str2id(spec_version, True)
+
+                    log(requirement_name_id, requirement_evr_id)
+                    rel_id = pool.rel2id(
+                        requirement_name_id,
+                        requirement_evr_id,
+                        OPERATOR_TO_FLAGS[spec_operator],
+                        True,
+                    )
+
+                    log("rel_id", rel_id, requirement_name, spec_operator, spec_version)
+
+                    solvable.add_deparray(solv.SOLVABLE_REQUIRES, rel_id)
+
+    addedprovides = pool.addfileprovides_queue()
+    if addedprovides:
+        sysrepo.updateaddedprovides(addedprovides)
+        repo.updateaddedprovides(addedprovides)
+
+    pool.createwhatprovides()
+
+    jobs = []
+
+    for arg in overall_requirements:
+        flags = (
+            solv.Selection.SELECTION_REL |
+            solv.Selection.SELECTION_NAME |
+            solv.Selection.SELECTION_WITH_SOURCE
+        )
+
+        sel = pool.select(arg, flags)
+
+        if sel.isempty():
+            error = "nothing matches '%s'" % arg
+            log(error)
+            return error
+
+        if sel.flags() & solv.Selection.SELECTION_FILELIST:
+            log("[using file list match for '%s']" % arg)
+        if sel.flags() & solv.Selection.SELECTION_PROVIDES:
+            log("[using capability match for '%s']" % arg)
+
+        jobs += sel.jobs(solv.Job.SOLVER_INSTALL)
+
+    for job in jobs:
+        for solvable in job.solvables():
+            solvable_url = solvable.lookup_str(solv.SOLVABLE_URL)
+            if solvable_url:
+                log("Url:         %s" % solvable_url)
+            solvable_license = solvable.lookup_str(solv.SOLVABLE_LICENSE)
+            if solvable_license:
+                log("License:     %s" % solvable_license)
+
+    pool.set_debuglevel(0)
+    solver = pool.Solver()
+
+    while True:
+        problems = solver.solve(jobs)
+        if not problems:
+            break
+
+        return str([str(p) for p in problems])
+
+    # no problems, show transaction
+    trans = solver.transaction()
+    del solver
+    if trans.isempty():
+        return "transaction is empty"
+
+    for cl in trans.classify(
+        solv.Transaction.SOLVER_TRANSACTION_SHOW_OBSOLETES |
+        solv.Transaction.SOLVER_TRANSACTION_OBSOLETE_IS_UPGRADE,
+    ):
+        if cl.type == solv.Transaction.SOLVER_TRANSACTION_INSTALL:
+            versions = []
+            for p in cl.solvables():
+                log("  - %s" % p)
+                versions.append((p.name, p.evr))
+            return versions
+    return "unknown error"
-- 
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