Differences

This shows you the differences between two versions of the page.

--- projects:progit:inspection [2016/02/06 23:23] – mkucia
+++ projects:progit:inspection [2016/02/21 21:25] – [Range] mkucia
@@ Line 1: / Line 1: @@
 ====== Inspecting Git repository ======
-===== Te Three Main States =====
+===== The Three Main States =====
 ^ State ^ Location ^ Description ^ Method of inspection ^
-| Commited | .git directory | Stored in DB | ''git log'' |
+| Commited | .git directory | Stored in DB | ''git log'' ''git show'' ''...'' |
 | Modified | Working directory | Changed | ''git status'' ''git diff'' |
 | Staged | Staging area (.git/index) | Changed and marked for next commit to the DB | ''git status'' |
-<hidden Staging area has many names>
+Staging area has many names:
   * Index
   * Cache
@@ Line 15: / Line 15: @@
   * Staging area
   * Staged files
-</hidden>
-===== Specifying revision =====
+===== Revision =====
 There are many ways to distinguish a specific commit from Git repository.
-  - SHA (hash) - The [[wp>SHA-1]] algorithm is used to create a unique 40-byte hexadecimal string in many corners of git. The SHA (hash-object cat-file)
+  - ''**SHA**'' (hash) - The [[wp>SHA-1]] algorithm is used to create a unique 40-byte hexadecimal string in many corners of git. The SHA (hash-object cat-file)
+  - (refnames, refs)
+    - ''**Branch reference**'' (heads) - Branches in Git are nothing more than pointers to the commit. Branch reference is a SHA value of the most recent commit and it is updated with each new commit added. (show rev-parse show-ref)
+    - ''**Tag reference**'' - Similar to Branch reference but does not change with new commits. (git describe)
+    - ''**HEAD**'' (''**@**'') - Note the capital letters. Points to the current commit. (git describe)
+    - ''**Other**'' like FETCH_HEAD, MERGE_HEAD, CHERRY_PICK_HEAD, ORIG_HEAD
+    - ''**<refname>@{<date>}**'' - For example ''master@{yesterday}'', ''HEAD@{5 minutes ago}''. Note: Date parsing is undocumented but the parser [[https://github.com/git/git/blob/master/date.c|code]] can be accessed on github.
+    - ''**<refname>@{n}**'' - For example ''master@{7}'' returns 7th prior commit from master head.
+    - ''**<refname>@{-n}**'' - For example ''@{-2}'' returns 2nd commit checked out before current one.
+    - ''**<branchname>@{upstream}**'' ''git rev-parse --symbolic-full-name @{u}''
+    - ''**<rev>^n**''
+    - ''**<rev>~n**''
+    - more ...
+==== Walking the tree with ''^'' and ''~'' ====
+<code>
+A =      = A^0
+B = A^   = A^1     = A~1
+C = A^2  = A^2
+D = A^^  = A^1^1   = A~2
+E = B^2  = A^^2
+F = B^3  = A^^3
+G = A^^^ = A^1^1^1 = A~3
+H = D^2  = B^^2    = A^^^2  = A~2^2
+I = F^   = B^3^    = A^^3^
+J = F^2  = B^3^2   = A^^3^2
+</code>
+==== Tree ====
+(idea taken from [[https://www.kernel.org/pub/software/scm/git/docs/gitrevisions.html|here]])
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+</html>
+===== Range =====
+  - ''<rev>'' - ancestors of commit revision
+  - ''^<rev>''
+  - ''<rev1>..<rev2>'' - reachable from rev2 but exclude reachable from rev1 (none is HEAD)
+  - ''<rev1>...<rev2>'' - reachable from either but not both (none is HEAD)
+  - more ...
+http://stackoverflow.com/questions/7251477/what-are-the-differences-between-double-dot-and-triple-dot-in-git-dif
+===== Reflog =====
+"Log of references" - list of updates to the references
+''git reflog''
 ===== Diff =====
+Show difference between working directory (or index if ''--cached'') and commited.
+===== Merge-Base =====
 ===== Debugging with Git =====
-| ''blame'' |  |
+| ''blame'' | Line-by-line who last modified line |
-| ''grep'' | |
+| ''grep'' | Search files for given expression |
-| ''bisect'' | |
+| ''bisect'' | Manually switch between commits until the one that introduces a chenge is found |
@@ Line 36: / Line 82: @@
   * https://www.atlassian.com/git/tutorials/inspecting-a-repository/
   * https://www.kernel.org/pub/software/scm/git/docs/gitrevisions.html
+  * https://git-scm.com/book/en/v2/Git-Tools-Revision-Selection
   * https://git-scm.com/book/en/v2/Git-Basics-Viewing-the-Commit-History
   * https://git-scm.com/book/en/v2/Git-Commands-Inspection-and-Comparison
   * https://git-scm.com/book/en/v2/Git-Commands-Debugging
   * http://www.sbf5.com/~cduan/technical/git/git-1.shtml
+  * http://web.mit.edu/nelhage/Public/git-slides-2009.pdf
   * https://git-scm.com/docs/git-status
@@ Line 45: / Line 93: @@
   * https://git-scm.com/docs/git-hash-object
   * https://git-scm.com/docs/git-cat-file
+  * https://git-scm.com/docs/git-rev-parse
+  * https://git-scm.com/docs/git-reflog