git log 显示原理
什么是git中的HEAD？HEAD是git当前检出的commit
当你使用git log查看版本历史时，默认看到的只是HEAD及其祖先的历史，对于与HEAD无任何关系的历史则不显示，如果要查看所有历史，使用git log --all。
如果你没有任何本地分支，而检出的是从远程仓库pull下来的版本，则git log --all将只显示包含此版本的所有远程分支历史。
如果创建了本地分支，git log --all将显示本地的所有历史。
1、git checkout 1efb47144
2、git log --pretty=oneline --graph
* 1efb47144204bf54f92fb7c43dea5883717fdcf5 Update
* fd388bc32a975f1467d0ec1a32bd0533f1e429bf Add TARGET_CPU_SMP := true
* 608cac5ebfe89c340b47ca5cd597d8415b339dc6 Enable dual osd
* a265b3376a65a6684cebc3eb0d21834d19c83ad3 Restore to QuadrantAdvanced v1.1.6
* 1dec40034719fde21c37e5a67775ba387ec55981 Trivial update - due to kernel versio
* 4d853b98adf1557f0c6e09f67a9334fe4509e4a0 set a switch for ffmpeg/libswscale, c
* d382b96201161dda8cea5401be48aaeeb587a345 Merge "check in switch system"
|\
| * 2368dccedddf7d562d5dbeb92e375c57ce3c9c8e check in switch system
* | 471af98cc4556ac6c9ee0dd77de702d40ef4fccf Merge "Change for Switching to bo
|\ \
| * | d91ce564429184ab1183d474cbdae038ce3adc2f Change for Switching to boss mach
* | | 4fcc8d3d1b6b0919182e46301b220c78ab2485ab Add LCD Backlight HW Module
3、git branch -a*(no branch) 4、git log --all --pretty=oneline --graph #此处只显示远程服务器上的全部历史
* 97aee57f92f80d9b2ee138fef6ea4f424f5f1731 fix bug 115> * 3abf427e20dbd98abb77cd19408bdc0dbd4e25e4 add iperf support in UBIFS init.ubi
* 1efb47144204bf54f92fb7c43dea5883717fdcf5 Update
* fd388bc32a975f1467d0ec1a32bd0533f1e429bf Add TARGET_CPU_SMP := true
* 608cac5ebfe89c340b47ca5cd597d8415b339dc6 Enable dual osd
* a265b3376a65a6684cebc3eb0d21834d19c83ad3 Restore to QuadrantAdvanced v1.1.6
* 1dec40034719fde21c37e5a67775ba387ec55981 Trivial update - due to kernel versio
* 4d853b98adf1557f0c6e09f67a9334fe4509e4a0 set a switch for ffmpeg/libswscale, c
* d382b96201161dda8cea5401be48aaeeb587a345 Merge "check in switch system"
|\
| * 2368dccedddf7d562d5dbeb92e375c57ce3c9c8e check in switch system
* | 471af98cc4556ac6c9ee0dd77de702d40ef4fccf Merge "Change for Switching to bo
|\ \
| * | d91ce564429184ab1183d474cbdae038ce3adc2f Change for Switching to boss mach
* | | 4fcc8d3d1b6b0919182e46301b220c78ab2485ab Add LCD Backlight HW Module
5、git checkout -b master 1efb47144
6、git log --all --pretty=oneline --graph
* 163e1679654a39ed440aff718974f3057df300ee add hello
| * 97aee57f92f80d9b2ee138fef6ea4f424f5f1731 fix bug 115> | * 3abf427e20dbd98abb77cd19408bdc0dbd4e25e4 add iperf support in UBIFS init.ubi
|/
* 1efb47144204bf54f92fb7c43dea5883717fdcf5 Update
* fd388bc32a975f1467d0ec1a32bd0533f1e429bf Add TARGET_CPU_SMP := true
* 608cac5ebfe89c340b47ca5cd597d8415b339dc6 Enable dual osd
* a265b3376a65a6684cebc3eb0d21834d19c83ad3 Restore to QuadrantAdvanced v1.1.6
* 1dec40034719fde21c37e5a67775ba387ec55981 Trivial update - due to kernel versio
* 4d853b98adf1557f0c6e09f67a9334fe4509e4a0 set a switch for ffmpeg/libswscale, c
* d382b96201161dda8cea5401be48aaeeb587a345 Merge "check in switch system"
|\
| * 2368dccedddf7d562d5dbeb92e375c57ce3c9c8e check in switch system
* | 471af98cc4556ac6c9ee0dd77de702d40ef4fccf Merge "Change for Switching to bo
|\ \
| * | d91ce564429184ab1183d474cbdae038ce3adc2f Change for Switching to boss mach
* | | 4fcc8d3d1b6b0919182e46301b220c78ab2485ab Add LCD Backlight HW Module
其中163e1679654a39ed440是本地提交的commit
强烈建议不要在no branch上提交commit，这样即使是git log --all和git rev-list --all也无法看到，暂时我还没有找到合适的方法来找到这样的commit。
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