Skip to content

Instantly share code, notes, and snippets.

@ssp

ssp/git-extract-file.markdown

Created January 23, 2012 13:21
Show Gist options

  • Select an option

    Learn more about clone URLs
  • Save ssp/1663093 to your computer and use it in GitHub Desktop.

Select an option

Learn more about clone URLs
Save ssp/1663093 to your computer and use it in GitHub Desktop.
Download ZIP

Revisions

  1. ssp revised this gist Jan 23, 2012. 1 changed file with 24 additions and 20 deletions.
    44 changes: 24 additions & 20 deletions git-extract-file.markdown
    View file
    Original file line number Diff line number Diff line change
    @@ -9,35 +9,39 @@ Finally all remaining files are listed using `git ls`, the files to keep are rem

    ### 1. copy the repository to extract the file from and go to the desired branch
    ```sh
    ➜ /tmp: git clone git@github.com:ssp/pazpar2.git pazpar2g
    zsh: correct 'pazpar2g' to 'pazpar2' [nyae]? n
    ➜ /tmp git clone git@github.com:ssp/pazpar2.git pazpar2g
    Cloning into pazpar2g...
    remote: Counting objects: 14950, done.
    remote: Compressing objects: 100% (4092/4092), done.
    remote: Total 14950 (delta 10938), reused 14719 (delta 10707)
    Receiving objects: 100% (14950/14950), 3.30 MiB | 1.60 MiB/s, done.
    Resolving deltas: 100% (10938/10938), done.
    ➜ /tmp __cd pazpar2g__
    ➜ pazpar2g git:(master) __git checkout ssp__
    ➜ /tmp cd pazpar2g
    ➜ pazpar2g git:(master) git checkout ssp
    Branch ssp set up to track remote branch ssp from origin.
    Switched to a new branch 'ssp'
    ```

    ### 2. reduce the repository to just the subfolder »etc« which contains the interesting file(s)
    ➜ pazpar2g git:(ssp) __git filter-branch --prune-empty --subdirectory-filter etc -- --all__
    Rewrite b3d4f2a89fdee662fb43122990fc28aa2c08bee5 (558/558)
    Ref 'refs/heads/master' was rewritten
    Ref 'refs/heads/ssp' was rewritten
    Ref 'refs/remotes/origin/master' was rewritten
    WARNING: Ref 'refs/remotes/origin/master' is unchanged
    Ref 'refs/remotes/origin/ssp' was rewritten
    Ref 'refs/tags/wildcard-matching' was rewritten
    ```sh
    ➜ pazpar2g git:(ssp) git filter-branch --prune-empty --subdirectory-filter etc -- --all
    Rewrite b3d4f2a89fdee662fb43122990fc28aa2c08bee5 (558/558)
    Ref 'refs/heads/master' was rewritten
    Ref 'refs/heads/ssp' was rewritten
    Ref 'refs/remotes/origin/master' was rewritten
    WARNING: Ref 'refs/remotes/origin/master' is unchanged
    Ref 'refs/remotes/origin/ssp' was rewritten
    Ref 'refs/tags/wildcard-matching' was rewritten
    ```

    ### 3. remove all files other than the ones you want to keep (tmarc.xsl, check-pazpar2.xsl)
    ➜ pazpar2g git:(ssp) __git filter-branch -f --prune-empty --index-filter 'git rm --cached --ignore-unmatch $(git ls-files | grep -v "tmarc.xsl\|check-pazpar2.sh")'__
    Rewrite f06a533323ad8257efa9e52c45ad2e22e2b09b1c (1/558)rm 'bibs.pz'
    …
    Ref 'refs/heads/ssp' was rewritten
    ➜ pazpar2g git:(ssp) __ls -l __
    total 48
    -rwxrwxr-x 1 ssp ssp 1359 2012-01-23 14:03 check-pazpar2.sh
    -rw-rw-r-- 1 ssp ssp 41078 2012-01-23 14:03 tmarc.xsl
    ```sh
    ➜ pazpar2g git:(ssp) git filter-branch -f --prune-empty --index-filter 'git rm --cached --ignore-unmatch $(git ls-files | grep -v "tmarc.xsl\|check-pazpar2.sh")'
    Rewrite f06a533323ad8257efa9e52c45ad2e22e2b09b1c (1/558)rm 'bibs.pz'
    … [lenghty output omitted]
    Ref 'refs/heads/ssp' was rewritten
    ➜ pazpar2g git:(ssp) ls -l
    total 48
    -rwxrwxr-x 1 ssp ssp 1359 2012-01-23 14:03 check-pazpar2.sh
    -rw-rw-r-- 1 ssp ssp 41078 2012-01-23 14:03 tmarc.xsl
    ```
  2. ssp revised this gist Jan 23, 2012. 1 changed file with 1 addition and 1 deletion.
    2 changes: 1 addition & 1 deletion git-extract-file.markdown
    View file
    Original file line number Diff line number Diff line change
    @@ -9,7 +9,7 @@ Finally all remaining files are listed using `git ls`, the files to keep are rem

    ### 1. copy the repository to extract the file from and go to the desired branch
    ```sh
    ➜ /tmp git clone git@github.com:ssp/pazpar2.git pazpar2g
    ➜ /tmp: git clone git@github.com:ssp/pazpar2.git pazpar2g
    zsh: correct 'pazpar2g' to 'pazpar2' [nyae]? n
    Cloning into pazpar2g...
    remote: Counting objects: 14950, done.
  3. ssp revised this gist Jan 23, 2012. 1 changed file with 1 addition and 1 deletion.
    2 changes: 1 addition & 1 deletion git-extract-file.markdown
    View file
    Original file line number Diff line number Diff line change
    @@ -9,7 +9,7 @@ Finally all remaining files are listed using `git ls`, the files to keep are rem

    ### 1. copy the repository to extract the file from and go to the desired branch
    ```sh
    ➜ /tmp **git clone git@github.com:ssp/pazpar2.git pazpar2g**
    ➜ /tmp git clone git@github.com:ssp/pazpar2.git pazpar2g
    zsh: correct 'pazpar2g' to 'pazpar2' [nyae]? n
    Cloning into pazpar2g...
    remote: Counting objects: 14950, done.
  4. ssp revised this gist Jan 23, 2012. 1 changed file with 14 additions and 13 deletions.
    27 changes: 14 additions & 13 deletions git-extract-file.markdown
    View file
    Original file line number Diff line number Diff line change
    @@ -8,19 +8,20 @@ Finally all remaining files are listed using `git ls`, the files to keep are rem


    ### 1. copy the repository to extract the file from and go to the desired branch
    ➜ /tmp **git clone git@github.com:ssp/pazpar2.git pazpar2g**
    zsh: correct 'pazpar2g' to 'pazpar2' [nyae]? n
    Cloning into pazpar2g...
    remote: Counting objects: 14950, done.
    remote: Compressing objects: 100% (4092/4092), done.
    remote: Total 14950 (delta 10938), reused 14719 (delta 10707)
    Receiving objects: 100% (14950/14950), 3.30 MiB | 1.60 MiB/s, done.
    Resolving deltas: 100% (10938/10938), done.
    ➜ /tmp __cd pazpar2g__
    ➜ pazpar2g git:(master) __git checkout ssp__
    Branch ssp set up to track remote branch ssp from origin.
    Switched to a new branch 'ssp'

    ```sh
    ➜ /tmp **git clone git@github.com:ssp/pazpar2.git pazpar2g**
    zsh: correct 'pazpar2g' to 'pazpar2' [nyae]? n
    Cloning into pazpar2g...
    remote: Counting objects: 14950, done.
    remote: Compressing objects: 100% (4092/4092), done.
    remote: Total 14950 (delta 10938), reused 14719 (delta 10707)
    Receiving objects: 100% (14950/14950), 3.30 MiB | 1.60 MiB/s, done.
    Resolving deltas: 100% (10938/10938), done.
    ➜ /tmp __cd pazpar2g__
    ➜ pazpar2g git:(master) __git checkout ssp__
    Branch ssp set up to track remote branch ssp from origin.
    Switched to a new branch 'ssp'
    ```
    ### 2. reduce the repository to just the subfolder »etc« which contains the interesting file(s)
    ➜ pazpar2g git:(ssp) __git filter-branch --prune-empty --subdirectory-filter etc -- --all__
    Rewrite b3d4f2a89fdee662fb43122990fc28aa2c08bee5 (558/558)
  5. ssp revised this gist Jan 23, 2012. 1 changed file with 1 addition and 1 deletion.
    2 changes: 1 addition & 1 deletion git-extract-file.markdown
    View file
    Original file line number Diff line number Diff line change
    @@ -8,7 +8,7 @@ Finally all remaining files are listed using `git ls`, the files to keep are rem


    ### 1. copy the repository to extract the file from and go to the desired branch
    ➜ /tmp __git clone git@github.com:ssp/pazpar2.git pazpar2g__
    ➜ /tmp **git clone git@github.com:ssp/pazpar2.git pazpar2g**
    zsh: correct 'pazpar2g' to 'pazpar2' [nyae]? n
    Cloning into pazpar2g...
    remote: Counting objects: 14950, done.
  6. ssp revised this gist Jan 23, 2012. 1 changed file with 3 additions and 3 deletions.
    6 changes: 3 additions & 3 deletions git-extract-file.markdown
    View file
    Original file line number Diff line number Diff line change
    @@ -1,7 +1,7 @@
    # How to extract a single file with its history from a git repository
    These steps show two less common interactions with git to extract a single file which is inside a subfolder from a git repository. These steps essentially reduce the repository to just the desired files and are performed on a copy (1.).
    These steps show two less common interactions with git to extract a single file which is inside a subfolder from a git repository. These steps essentially reduce the repository to just the desired files and should performed on a copy of the original repository (1.).

    Then the repository is reduced to just the subfolder containing the files in question using `git filter-branch --subdirectory-filter` (2.) which is a useful step by itself if just a subfolder needs to be extracted. This step moves the desired files to the top level of the repository.
    First the repository is reduced to just the subfolder containing the files in question using `git filter-branch --subdirectory-filter` (2.) which is a useful step by itself if just a subfolder needs to be extracted. This step moves the desired files to the top level of the repository.

    Finally all remaining files are listed using `git ls`, the files to keep are removed from that using `grep -v` and the resulting list is passed to `git rm` which is invoked by `git filter-branch --index-filter` (3.). A bit convoluted but it does the trick.

    @@ -21,7 +21,7 @@ Finally all remaining files are listed using `git ls`, the files to keep are rem
    Branch ssp set up to track remote branch ssp from origin.
    Switched to a new branch 'ssp'

    ### 2. (if necessary) reduce the repository to just the subfolder etc which contains the interesting file(s)
    ### 2. reduce the repository to just the subfolder »etc« which contains the interesting file(s)
    ➜ pazpar2g git:(ssp) __git filter-branch --prune-empty --subdirectory-filter etc -- --all__
    Rewrite b3d4f2a89fdee662fb43122990fc28aa2c08bee5 (558/558)
    Ref 'refs/heads/master' was rewritten
  7. ssp created this gist Jan 23, 2012.
    42 changes: 42 additions & 0 deletions git-extract-file.markdown
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,42 @@
    # How to extract a single file with its history from a git repository
    These steps show two less common interactions with git to extract a single file which is inside a subfolder from a git repository. These steps essentially reduce the repository to just the desired files and are performed on a copy (1.).

    Then the repository is reduced to just the subfolder containing the files in question using `git filter-branch --subdirectory-filter` (2.) which is a useful step by itself if just a subfolder needs to be extracted. This step moves the desired files to the top level of the repository.

    Finally all remaining files are listed using `git ls`, the files to keep are removed from that using `grep -v` and the resulting list is passed to `git rm` which is invoked by `git filter-branch --index-filter` (3.). A bit convoluted but it does the trick.



    ### 1. copy the repository to extract the file from and go to the desired branch
    ➜ /tmp __git clone git@github.com:ssp/pazpar2.git pazpar2g__
    zsh: correct 'pazpar2g' to 'pazpar2' [nyae]? n
    Cloning into pazpar2g...
    remote: Counting objects: 14950, done.
    remote: Compressing objects: 100% (4092/4092), done.
    remote: Total 14950 (delta 10938), reused 14719 (delta 10707)
    Receiving objects: 100% (14950/14950), 3.30 MiB | 1.60 MiB/s, done.
    Resolving deltas: 100% (10938/10938), done.
    ➜ /tmp __cd pazpar2g__
    ➜ pazpar2g git:(master) __git checkout ssp__
    Branch ssp set up to track remote branch ssp from origin.
    Switched to a new branch 'ssp'

    ### 2. (if necessary) reduce the repository to just the subfolder etc which contains the interesting file(s)
    ➜ pazpar2g git:(ssp) __git filter-branch --prune-empty --subdirectory-filter etc -- --all__
    Rewrite b3d4f2a89fdee662fb43122990fc28aa2c08bee5 (558/558)
    Ref 'refs/heads/master' was rewritten
    Ref 'refs/heads/ssp' was rewritten
    Ref 'refs/remotes/origin/master' was rewritten
    WARNING: Ref 'refs/remotes/origin/master' is unchanged
    Ref 'refs/remotes/origin/ssp' was rewritten
    Ref 'refs/tags/wildcard-matching' was rewritten

    ### 3. remove all files other than the ones you want to keep (tmarc.xsl, check-pazpar2.xsl)
    ➜ pazpar2g git:(ssp) __git filter-branch -f --prune-empty --index-filter 'git rm --cached --ignore-unmatch $(git ls-files | grep -v "tmarc.xsl\|check-pazpar2.sh")'__
    Rewrite f06a533323ad8257efa9e52c45ad2e22e2b09b1c (1/558)rm 'bibs.pz'
    …
    Ref 'refs/heads/ssp' was rewritten
    ➜ pazpar2g git:(ssp) __ls -l __
    total 48
    -rwxrwxr-x 1 ssp ssp 1359 2012-01-23 14:03 check-pazpar2.sh
    -rw-rw-r-- 1 ssp ssp 41078 2012-01-23 14:03 tmarc.xsl