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Diffstat (limited to 'build2/version/snapshot-git.cxx')
| -rw-r--r-- | build2/version/snapshot-git.cxx | 175 |
1 files changed, 0 insertions, 175 deletions
diff --git a/build2/version/snapshot-git.cxx b/build2/version/snapshot-git.cxx deleted file mode 100644 index f7993d2..0000000 --- a/build2/version/snapshot-git.cxx +++ /dev/null @@ -1,175 +0,0 @@ -// file : build2/version/snapshot-git.cxx -*- C++ -*- -// copyright : Copyright (c) 2014-2019 Code Synthesis Ltd -// license : MIT; see accompanying LICENSE file - -#include <ctime> // time_t - -#include <libbutl/sha1.mxx> - -#include <build2/version/snapshot.hxx> - -using namespace std; -using namespace butl; - -namespace build2 -{ - namespace version - { - snapshot - extract_snapshot_git (const dir_path& src_root) - { - snapshot r; - const char* d (src_root.string ().c_str ()); - - // First check whether the working directory is clean. There doesn't - // seem to be a way to do everything in a single invocation (the - // porcelain v2 gives us the commit id but not timestamp). - // - - // If git status --porcelain returns anything, then the working - // directory is not clean. - // - { - const char* args[] {"git", "-C", d, "status", "--porcelain", nullptr}; - r.committed = run<string> ( - 3 /* verbosity */, - args, - [](string& s, bool) {return move (s);}).empty (); - } - - // Now extract the commit id and date. One might think that would be - // easy... Commit id is a SHA1 hash of the commit object. And commit - // object looks like this: - // - // commit <len>\0 - // <data> - // - // Where <len> is the size of <data> and <data> is the output of: - // - // git cat-file commit HEAD - // - // There is also one annoying special case: new repository without any - // commits. In this case the above command will fail (with diagnostics - // and non-zero exit code) because there is no HEAD. Of course, it can - // also fail for other reason (like broken repository) which would be - // hard to distinguish. Note, however, that we just ran git status and - // it would have most likely failed if this were the case. So here we - // (reluctantly) assume that the only reason git cat-file fails is if - // there is no HEAD (that we equal with the "new repository" condition - // which is, strictly speaking, might not be the case either). So we - // suppress any diagnostics, and handle non-zero exit code. - // - string data; - - const char* args[] { - "git", "-C", d, "cat-file", "commit", "HEAD", nullptr}; - process pr (run_start (3 /* verbosity */, - args, - 0 /* stdin */, - -1 /* stdout */, - false /* error */)); - - string l; - try - { - ifdstream is (move (pr.in_ofd), ifdstream::badbit); - - while (!eof (getline (is, l))) - { - data += l; - data += '\n'; // We assume there is always a newline. - - if (r.sn == 0 && l.compare (0, 10, "committer ") == 0) - try - { - // The line format is: - // - // committer <noise> <timestamp> <timezone> - // - // For example: - // - // committer John Doe <john@example.org> 1493117819 +0200 - // - // The timestamp is in seconds since UNIX epoch. The timezone - // appears to be always numeric (+0000 for UTC). Note that - // timestamp appears to be already in UTC with timezone being just - // for information it seems. - // - size_t p1 (l.rfind (' ')); // Can't be npos. - - size_t p2 (l.rfind (' ', p1 - 1)); - if (p2 == string::npos) - throw invalid_argument ("missing timestamp"); - - string ts (l, p2 + 1, p1 - p2 - 1); - time_t t (static_cast<time_t> (stoull (ts))); - -#if 0 - string tz (l, p1 + 1); - - if (tz.size () != 5) - throw invalid_argument ("invalid timezone"); - - unsigned long h (stoul (string (tz, 1, 2))); - unsigned long m (stoul (string (tz, 3, 2))); - unsigned long s (h * 3600 + m * 60); - - // The timezone indicates where the timestamp was generated so to - // convert to UTC we need to invert the sign. - // - switch (tz[0]) - { - case '+': t -= s; break; - case '-': t += s; break; - default: throw invalid_argument ("invalid timezone sign"); - } -#endif - // Represent as YYYYMMDDhhmmss. - // - r.sn = stoull (to_string (system_clock::from_time_t (t), - "%Y%m%d%H%M%S", - false /* special */, - false /* local (already in UTC) */)); - } - catch (const invalid_argument& e) - { - fail << "unable to extract git commit date from '" << l << "': " - << e; - } - } - - is.close (); - } - catch (const io_error&) - { - // Presumably the child process failed. Let run_finish() deal with - // that. - } - - if (!run_finish (args, pr, false /* error */, l)) - { - // Presumably new repository without HEAD. Return uncommitted snapshot - // with UNIX epoch as timestamp. - // - r.sn = 19700101000000ULL; - r.committed = false; - return r; - } - - if (r.sn == 0) - fail << "unable to extract git commit id/date for " << src_root; - - if (r.committed) - { - sha1 cs; - cs.append ("commit " + to_string (data.size ())); // Includes '\0'. - cs.append (data.c_str (), data.size ()); - r.id.assign (cs.string (), 12); // 12-characters abbreviated commit id. - } - else - r.sn++; // Add a second. - - return r; - } - } -} |