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author Jeff Hammel <k0scist@gmail.com>
date Mon, 20 Oct 2025 15:22:19 -0700
parents 3fe1024377ca
children
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1 #!/usr/bin/env python
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2
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3 """
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4 unroll a set of dependencies
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5 """
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6
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7 import sys
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8
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9 def cycle_check(order, dependencies):
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10 """ensure no cyclic dependencies"""
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11 order_dict = dict([(j, i) for i, j in enumerate(order)])
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12 for package, deps in dependencies.items():
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13 index = order_dict[package]
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14 for d in deps:
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15 assert index > order_dict[d], "Cyclic dependencies detected"
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16
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17
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18 def unroll_dependencies(dependencies):
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19 """unroll dependencies"""
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20 order = []
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21
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22 # unroll the dependencies
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23 for package, deps in dependencies.items():
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24 try:
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25 index = order.index(package)
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26 except ValueError:
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27 order.append(package)
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28 index = len(order) - 1
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29 for dep in deps:
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30 try:
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31 dep_index = order.index(dep)
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32 if dep_index > index:
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33 order.insert(dep_index+1, package)
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34 order.pop(index)
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35 index = dep_index
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36 except ValueError:
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37 order.insert(index, dep)
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38
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39 cycle_check(order, dependencies)
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40 return order
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41
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42 def unroll_dependencies2(dependencies):
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43 """a variation"""
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44 order = []
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45
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46 # flatten all
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47 packages = set(dependencies.keys())
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48 for deps in dependencies.values():
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49 packages.update(deps)
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50
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51 while len(order) != len(packages):
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52
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53 for package in packages.difference(order):
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54 if dependencies.get(package, set()).issubset(order):
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55 order.append(package)
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56 break
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57 else:
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58 raise AssertionError("Cyclic dependencies detected")
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59
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60 cycle_check(order, dependencies) # sanity
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61
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62 return order
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63
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64
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65 ### testing and CLI
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66
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67 def main(args=sys.argv[:1]):
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69 # testing set of dependencies
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70 deps = {'packageA': set(['packageB', 'packageC', 'packageF']),
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71 'packageB': set(['packageC', 'packageD', 'packageE', 'packageG']),
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72 'packageC': set(['packageE']),
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73 'packageE': set(['packageF', 'packageG']),
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74 'packageF': set(['packageG']),
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75 'packageX': set(['packageA', 'packageG'])}
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76 unrolled = unroll_dependencies(deps)
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77 print ('{}'.format(unrolled))
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79 unrolled = unroll_dependencies2(deps)
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80 print unrolled
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81
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82 # ensure cycle check works
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83 deps['packageD'] = set(['packageX'])
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84 try:
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85 unroll_dependencies(deps)
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86 raise Exception("Missed a cyclic dependency!")
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87 except AssertionError:
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88 pass
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89
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90 try:
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91 unroll_dependencies2(deps)
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92 raise Exception("Missed a cyclic dependency!")
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93 except AssertionError:
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94 pass
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95
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96 if __name__ == '__main__':
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97 main()