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Diffstat (limited to 'Documentation/git-fast-import.txt')
| -rw-r--r-- | Documentation/git-fast-import.txt | 98 |
1 files changed, 95 insertions, 3 deletions
diff --git a/Documentation/git-fast-import.txt b/Documentation/git-fast-import.txt index bd625ababf..c29a4f8126 100644 --- a/Documentation/git-fast-import.txt +++ b/Documentation/git-fast-import.txt @@ -385,6 +385,9 @@ new commit. Omitting the `from` command in the first commit of a new branch will cause fast-import to create that commit with no ancestor. This tends to be desired only for the initial commit of a project. +If the frontend creates all files from scratch when making a new +branch, a `merge` command may be used instead of `from` to start +the commit with an empty tree. Omitting the `from` command on existing branches is usually desired, as the current commit on that branch is automatically assumed to be the first ancestor of the new commit. @@ -427,13 +430,15 @@ existing value of the branch. `merge` ^^^^^^^ -Includes one additional ancestor commit, and makes the current -commit a merge commit. An unlimited number of `merge` commands per +Includes one additional ancestor commit. If the `from` command is +omitted when creating a new branch, the first `merge` commit will be +the first ancestor of the current commit, and the branch will start +out with no files. An unlimited number of `merge` commands per commit are permitted by fast-import, thereby establishing an n-way merge. However Git's other tools never create commits with more than 15 additional ancestors (forming a 16-way merge). For this reason it is suggested that frontends do not use more than 15 `merge` -commands per commit. +commands per commit; 16, if starting a new, empty branch. Here `<committish>` is any of the commit specification expressions also accepted by `from` (see above). @@ -805,6 +810,93 @@ Placing a `progress` command immediately after a `checkpoint` will inform the reader when the `checkpoint` has been completed and it can safely access the refs that fast-import updated. +Crash Reports +------------- +If fast-import is supplied invalid input it will terminate with a +non-zero exit status and create a crash report in the top level of +the Git repository it was importing into. Crash reports contain +a snapshot of the internal fast-import state as well as the most +recent commands that lead up to the crash. + +All recent commands (including stream comments, file changes and +progress commands) are shown in the command history within the crash +report, but raw file data and commit messages are excluded from the +crash report. This exclusion saves space within the report file +and reduces the amount of buffering that fast-import must perform +during execution. + +After writing a crash report fast-import will close the current +packfile and export the marks table. This allows the frontend +developer to inspect the repository state and resume the import from +the point where it crashed. The modified branches and tags are not +updated during a crash, as the import did not complete successfully. +Branch and tag information can be found in the crash report and +must be applied manually if the update is needed. + +An example crash: + +==== + $ cat >in <<END_OF_INPUT + # my very first test commit + commit refs/heads/master + committer Shawn O. Pearce <spearce> 19283 -0400 + # who is that guy anyway? + data <<EOF + this is my commit + EOF + M 644 inline .gitignore + data <<EOF + .gitignore + EOF + M 777 inline bob + END_OF_INPUT + + $ git-fast-import <in + fatal: Corrupt mode: M 777 inline bob + fast-import: dumping crash report to .git/fast_import_crash_8434 + + $ cat .git/fast_import_crash_8434 + fast-import crash report: + fast-import process: 8434 + parent process : 1391 + at Sat Sep 1 00:58:12 2007 + + fatal: Corrupt mode: M 777 inline bob + + Most Recent Commands Before Crash + --------------------------------- + # my very first test commit + commit refs/heads/master + committer Shawn O. Pearce <spearce> 19283 -0400 + # who is that guy anyway? + data <<EOF + M 644 inline .gitignore + data <<EOF + * M 777 inline bob + + Active Branch LRU + ----------------- + active_branches = 1 cur, 5 max + + pos clock name + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + 1) 0 refs/heads/master + + Inactive Branches + ----------------- + refs/heads/master: + status : active loaded dirty + tip commit : 0000000000000000000000000000000000000000 + old tree : 0000000000000000000000000000000000000000 + cur tree : 0000000000000000000000000000000000000000 + commit clock: 0 + last pack : + + + ------------------- + END OF CRASH REPORT +==== + Tips and Tricks --------------- The following tips and tricks have been collected from various |