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Overview
Comment:Convert the diagrams in the "Rebase Considered Harmful" document over to Pikchr.
Downloads: Tarball | ZIP archive | SQL archive
Timelines: family | ancestors | descendants | both | trunk
Files: files | file ages | folders
SHA3-256: 38d6a8f30eb0d58a9817350f9d987c04880d3d48766f50297bf4374b2ea2ca12
User & Date: drh 2020-09-19 00:44:46
References
2020-09-29
01:07
Removed www/rebase??.graphml, being the yEd inputs for generated SVGs replaced with Pikchrs in commit [38d6a8f3]. ... (check-in: f3c3a099 user: wyoung tags: trunk)
Context
2020-09-19
04:09
Update pikchr.c with support for dist(P1,P2) and copying the layer using "same". ... (check-in: af52ad89 user: drh tags: trunk)
00:44
Convert the diagrams in the "Rebase Considered Harmful" document over to Pikchr. ... (check-in: 38d6a8f3 user: drh tags: trunk)
2020-09-18
22:55
New pikchr.c with improved estimates for bounding boxes on text. ... (check-in: bac677f7 user: drh tags: trunk)
Changes
Hide Diffs Unified Diffs Ignore Whitespace Patch

Deleted www/rebase01.svg.

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Deleted www/rebase02.svg.

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Deleted www/rebase03.svg.

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    <g fill="white" text-rendering="geometricPrecision" shape-rendering="geometricPrecision" transform="matrix(1,0,0,1,-180,530)" stroke="white">
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      <text x="395.2709" y="-446.1328" clip-path="url(#clipPath2)" font-family="sans-serif" stroke="none" stroke-width="1" xml:space="preserve">C4</text>
    </g>
    <g fill="white" text-rendering="geometricPrecision" shape-rendering="geometricPrecision" transform="matrix(1,0,0,1,-180,530)" stroke="white">
      <circle r="15" clip-path="url(#clipPath2)" cx="372.4302" cy="-496.8418" stroke="none"/>
    </g>
    <g text-rendering="geometricPrecision" stroke-miterlimit="1.45" stroke-width="2" shape-rendering="geometricPrecision" transform="matrix(1,0,0,1,-180,530)" stroke-linecap="butt">
      <circle fill="none" r="15" clip-path="url(#clipPath2)" cx="372.4302" cy="-496.8418"/>
      <text x="364.4849" y="-492.3067" clip-path="url(#clipPath2)" font-family="sans-serif" stroke="none" stroke-width="1" xml:space="preserve">C3</text>
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    <g fill="white" text-rendering="geometricPrecision" shape-rendering="geometricPrecision" transform="matrix(1,0,0,1,-180,530)" stroke="white">
      <circle r="15" clip-path="url(#clipPath2)" cx="434.0022" cy="-496.8418" stroke="none"/>
    </g>
    <g text-rendering="geometricPrecision" stroke-miterlimit="1.45" stroke-width="2" shape-rendering="geometricPrecision" transform="matrix(1,0,0,1,-180,530)" stroke-linecap="butt">
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      <text x="426.0569" y="-492.3067" clip-path="url(#clipPath2)" font-family="sans-serif" stroke="none" stroke-width="1" xml:space="preserve">C5</text>
    </g>
    <g fill="white" text-rendering="geometricPrecision" shape-rendering="geometricPrecision" transform="matrix(1,0,0,1,-180,530)" stroke="white">
      <circle r="15" clip-path="url(#clipPath2)" cx="495.5743" cy="-496.8418" stroke="none"/>
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      <text x="487.629" y="-492.3067" clip-path="url(#clipPath2)" font-family="sans-serif" stroke="none" stroke-width="1" xml:space="preserve">C7</text>
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      <path d="M265.0721 -450.668 L253.0721 -455.668 L256.0721 -450.668 L253.0721 -445.668 Z" stroke-width="1" clip-path="url(#clipPath2)" stroke="none"/>
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</svg>
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A rebase is really nothing more than a merge (or a series of merges)
that deliberately forgets one of the parents of each merge step.
To help illustrate this fact,
consider the first rebase example from the 
[Git documentation][gitrebase].  The merge looks like this:


![merge case](./rebase01.svg)














And the rebase looks like this:


![rebase case](./rebase02.svg)













As the [Git documentation][gitrebase] points out, check-ins C4\' and C5
are identical.  The only difference between C4\' and C5 is that C5
records the fact that C4 is its merge parent but C4\' does not.

Thus, a rebase is just a merge that forgets where it came from.








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A rebase is really nothing more than a merge (or a series of merges)
that deliberately forgets one of the parents of each merge step.
To help illustrate this fact,
consider the first rebase example from the 
[Git documentation][gitrebase].  The merge looks like this:

~~~ pikchr
scale = 0.8
circle "C0" fit
arrow right 50%
circle same "C1"
arrow same
circle same "C2"
arrow same
circle same "C3"
arrow same
circle same "C5"
circle same "C4" at 1cm above C3
arrow from C2 to C4 chop
arrow from C4 to C5 chop
~~~

And the rebase looks like this:

~~~ pikchr
scale = 0.8
circle "C0" fit
arrow right 50%
circle same "C1"
arrow same
circle same "C2"
arrow same
circle same "C3"
arrow same
circle same "C4'"
circle same "C4" at 1cm above C3
arrow from C2 to C4 chop
~~~

As the [Git documentation][gitrebase] points out, check-ins C4\' and C5
are identical.  The only difference between C4\' and C5 is that C5
records the fact that C4 is its merge parent but C4\' does not.

Thus, a rebase is just a merge that forgets where it came from.

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### <a name="clean-diffs"></a>2.2 Rebase does not actually provide better feature-branch diffs

Another argument, often cited, is that rebasing a feature branch
allows one to see just the changes in the feature branch without
the concurrent changes in the main line of development. 
Consider a hypothetical case:



















![unmerged feature branch](./rebase03.svg)



In the above, a feature branch consisting of check-ins C3 and C5 is
run concurrently with the main line in check-ins C4 and C6.  Advocates
for rebase say that you should rebase the feature branch to the tip
of main in order to remove main-line development differences from
the feature branch's history:




















![rebased feature branch](./rebase04.svg)







You could choose to collapse C3\' and C5\' into a single check-in
as part of this rebase, but that's a side issue we'll deal with
[separately](#collapsing).

Because Fossil purposefully lacks rebase, the closest you can get to this same check-in
history is the following merge:



















![merged feature branch](./rebase05.svg)







Check-ins C5\' and C7 check-ins hold identical code.  The only
difference is in their history.  

The argument from rebase advocates
is that with merge it is difficult to see only the changes associated
with the feature branch without the commingled mainline changes.







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### <a name="clean-diffs"></a>2.2 Rebase does not actually provide better feature-branch diffs

Another argument, often cited, is that rebasing a feature branch
allows one to see just the changes in the feature branch without
the concurrent changes in the main line of development. 
Consider a hypothetical case:

~~~ pikchr
scale = 0.8
circle "C0" fit fill white
arrow right 50%
circle same "C1"
arrow same
circle same "C2"
arrow same
circle same "C4"
arrow same
circle same "C6"
circle same "C3" at last arrow.width + C0.rad*2 heading 30 from C2
arrow right 50%
circle same "C5"
arrow from C2 to C3 chop
box ht C3.y-C2.y wid C6.e.x-C0.w.x+1.5*C1.rad at C2 behind C0 fill 0xc6e2ff color 0xaac5df
box ht previous.ht wid previous.wid*0.55 with .se at previous.ne \
   behind C0 fill 0x9accfc color 0xaac5df
text "feature" with .s at previous.n
text "main" with .n at first box.s
~~~

In the above, a feature branch consisting of check-ins C3 and C5 is
run concurrently with the main line in check-ins C4 and C6.  Advocates
for rebase say that you should rebase the feature branch to the tip
of main in order to remove main-line development differences from
the feature branch's history:

~~~ pikchr
scale = 0.8
circle "C0" fit fill white
arrow right 50%
circle same "C1"
arrow same
circle same "C2"
arrow same
circle same "C4"
arrow same
circle same "C6"
circle same "C3" at last arrow.width + C0.rad*2 heading 30 from C2
arrow right 50%
circle same "C5"
arrow from C2 to C3 chop
C3P: circle same "C3'" at first arrow.width + C0.rad*2 heading 30 from C6
arrow right 50% from C3P.e
C5P: circle same "C5'"
arrow from C6 to C3P chop

box ht C3.y-C2.y wid C5P.e.x-C0.w.x+1.5*C1.rad with .w at 0.5*(first arrow.wid) west of C0.w \
   behind C0 fill 0xc6e2ff color 0xaac5df
box ht previous.ht wid previous.e.x - C2.w.x with .se at previous.ne \
   behind C0 fill 0x9accfc color 0xaac5df
~~~


You could choose to collapse C3\' and C5\' into a single check-in
as part of this rebase, but that's a side issue we'll deal with
[separately](#collapsing).

Because Fossil purposefully lacks rebase, the closest you can get to this same check-in
history is the following merge:

~~~ pikchr
scale = 0.8
circle "C0" fit fill white
arrow right 50%
circle same "C1"
arrow same
circle same "C2"
arrow same
circle same "C4"
arrow same
circle same "C6"
circle same "C3" at last arrow.width + C0.rad*2 heading 30 from C2
arrow right 50%
circle same "C5"
arrow same
circle same "C7"
arrow from C2 to C3 chop
arrow from C6 to C7 chop

box ht C3.y-C2.y wid C7.e.x-C0.w.x+1.5*C1.rad with .w at 0.5*(first arrow.wid) west of C0.w \
   behind C0 fill 0xc6e2ff color 0xaac5df
box ht previous.ht wid previous.e.x - C2.w.x with .se at previous.ne \
   behind C0 fill 0x9accfc color 0xaac5df
~~~


Check-ins C5\' and C7 check-ins hold identical code.  The only
difference is in their history.  

The argument from rebase advocates
is that with merge it is difficult to see only the changes associated
with the feature branch without the commingled mainline changes.