2 import sys, math, struct, glob, resource
4 from bup import options, git, _helpers
5 from bup.helpers import *
8 SHA_PER_PAGE=PAGE_SIZE/20.
11 bup midx [options...] <idxnames...>
13 o,output= output midx filename (default: auto-generated)
14 a,auto automatically create .midx from any unindexed .idx files
15 f,force automatically create .midx from *all* .idx files
16 p,print print names of generated midx files
17 max-files= maximum number of idx files to open at once [-1]
18 dir= directory containing idx/midx files
22 for i in xrange(0, len(l), count):
27 mf = min(resource.getrlimit(resource.RLIMIT_NOFILE))
29 mf -= 20 # just a safety margin
31 mf -= 6 # minimum safety margin
34 merge_into = _helpers.merge_into
36 def _do_midx(outdir, outfilename, infilenames, prefixstr):
39 sum = Sha1('\0'.join(infilenames)).hexdigest()
40 outfilename = '%s/midx-%s.midx' % (outdir, sum)
45 for name in infilenames:
46 ix = git.open_idx(name)
51 isinstance(ix, git.PackMidx) and ix.idxname_ofs or 0,
55 allfilenames.append(os.path.basename(n))
57 inp.sort(lambda x,y: cmp(str(y[0][y[2]:y[2]+20]),str(x[0][x[2]:x[2]+20])))
59 log('midx: %screating from %d files (%d objects).\n'
60 % (prefixstr, len(infilenames), total))
61 if (not opt.force and (total < 1024 and len(infilenames) < 3)) \
62 or len(infilenames) < 2 \
63 or (opt.force and not total):
64 debug1('midx: nothing to do.\n')
67 pages = int(total/SHA_PER_PAGE) or 1
68 bits = int(math.ceil(math.log(pages, 2)))
70 debug1('midx: table size: %d (%d bits)\n' % (entries*4, bits))
73 os.unlink(outfilename)
76 f = open(outfilename + '.tmp', 'w+b')
78 f.write(struct.pack('!II', git.MIDX_VERSION, bits))
79 assert(f.tell() == 12)
81 f.truncate(12 + 4*entries + 20*total + 4*total)
83 fmap = mmap_readwrite(f, close=False)
85 count = merge_into(fmap, bits, total, inp)
89 f.seek(0, os.SEEK_END)
90 f.write('\0'.join(allfilenames))
92 os.rename(outfilename + '.tmp', outfilename)
94 # this is just for testing
96 p = git.PackMidx(outfilename)
97 assert(len(p.idxnames) == len(infilenames))
99 assert(len(p) == total)
100 for pe, e in p, git.idxmerge(inp, final_progress=False):
101 assert(i == pi.next())
104 return total, outfilename
107 def do_midx(outdir, outfilename, infilenames, prefixstr):
108 rv = _do_midx(outdir, outfilename, infilenames, prefixstr)
109 if rv and opt['print']:
113 def do_midx_dir(path):
116 if opt.force and not opt.auto:
117 midxs = [] # don't use existing midx files
119 midxs = glob.glob('%s/*.midx' % path)
122 m = git.open_idx(mname)
123 contents[mname] = [('%s/%s' % (path,i)) for i in m.idxnames]
124 sizes[mname] = len(m)
126 # sort the biggest midxes first, so that we can eliminate smaller
127 # redundant ones that come later in the list
128 midxs.sort(lambda x,y: -cmp(sizes[x], sizes[y]))
132 for iname in contents[mname]:
133 if not already.get(iname):
137 debug1('%r is redundant\n' % mname)
141 midxs = [k for k in midxs if not already.get(k)]
142 idxs = [k for k in glob.glob('%s/*.idx' % path) if not already.get(k)]
145 i = git.open_idx(iname)
146 sizes[iname] = len(i)
148 all = [(sizes[n],n) for n in (midxs + idxs)]
150 # FIXME: what are the optimal values? Does this make sense?
151 DESIRED_HWM = opt.force and 1 or 5
152 DESIRED_LWM = opt.force and 1 or 2
153 existed = dict((name,1) for sz,name in all)
154 debug1('midx: %d indexes; want no more than %d.\n'
155 % (len(all), DESIRED_HWM))
156 if len(all) <= DESIRED_HWM:
157 debug1('midx: nothing to do.\n')
158 while len(all) > DESIRED_HWM:
160 part1 = [name for sz,name in all[:len(all)-DESIRED_LWM+1]]
161 part2 = all[len(all)-DESIRED_LWM+1:]
162 all = list(do_midx_group(path, part1)) + part2
163 if len(all) > DESIRED_HWM:
164 debug1('\nStill too many indexes (%d > %d). Merging again.\n'
165 % (len(all), DESIRED_HWM))
169 if not existed.get(name):
173 def do_midx_group(outdir, infiles):
174 groups = list(_group(infiles, opt.max_files))
176 for n,sublist in enumerate(groups):
178 gprefix = 'Group %d: ' % (n+1)
179 rv = _do_midx(path, None, sublist, gprefix)
186 o = options.Options(optspec)
187 (opt, flags, extra) = o.parse(sys.argv[1:])
189 if extra and (opt.auto or opt.force):
190 o.fatal("you can't use -f/-a and also provide filenames")
192 git.check_repo_or_die()
194 if opt.max_files < 0:
195 opt.max_files = max_files()
196 assert(opt.max_files >= 5)
199 do_midx(git.repo('objects/pack'), opt.output, extra, '')
200 elif opt.auto or opt.force:
204 paths = [git.repo('objects/pack')]
205 paths += glob.glob(git.repo('index-cache/*/.'))
207 debug1('midx: scanning %s\n' % path)
211 o.fatal("you must use -f or -a or provide input filenames")