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commit-graph: add 'verify' subcommand

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If the commit-graph file becomes corrupt, we need a way to verify
that its contents match the object database. In the manner of
'git fsck' we will implement a 'git commit-graph verify' subcommand
to report all issues with the file.

Add the 'verify' subcommand to the 'commit-graph' builtin and its
documentation. The subcommand is currently a no-op except for
loading the commit-graph into memory, which may trigger run-time
errors that would be caught by normal use. Add a simple test that
ensures the command returns a zero error code.

If no commit-graph file exists, this is an acceptable state. Do
not report any errors.

Helped-by: Ramsay Jones <ramsay@ramsayjones.plus.com>
Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Derrick Stolee
2018-06-27 09:24:32 -04:00
committed by Junio C Hamano
parent 0cbef8f8ce
commit 283e68c72f
5 changed files with 81 additions and 0 deletions
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6
Documentation/git-commit-graph.txt
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@ -10,6 +10,7 @@ SYNOPSIS
--------
[verse]
'git commit-graph read' [--object-dir <dir>]
'git commit-graph verify' [--object-dir <dir>]
'git commit-graph write' <options> [--object-dir <dir>]
@ -52,6 +53,11 @@ existing commit-graph file.
Read a graph file given by the commit-graph file and output basic
details about the graph file. Used for debugging purposes.
'verify'::
Read the commit-graph file and verify its contents against the object
database. Used to check for corrupted data.
EXAMPLES
--------