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--- sourceforge:git [2018/04/21 15:45]
karl created
+++ sourceforge:git [2018/04/22 17:02] (current)
karl Add script example to fetch and rebase
@@ Line 1: / Line 1: @@
 ====== Git ======
-Git is a revision control system, just like rcs, cvs and svn are. \\
+Git is a revision control system, just like rcs, cvs and [[svn|subversion (SVN)]] are. \\
 Though the Crossfire repository is maintained by svn, it is possible to access this svn repo with git. \\
-The svn package needs to be installed though, since it has bindings for PERL because git-svn is a perl script.
+The subversion package needs to be installed though, since it has bindings for PERL because git-svn is a perl script located in {prefix}/libexec/git-core .
 ===== Prerequisites ==
-The bindings of SVN for perl are available if SWIG is installed. \\
+The bindings of SVN for Perl are available if SWIG is installed. \\
 SVN needs to know where to find the swig binary at compilation time :
 <code bash>
@@ Line 13: / Line 13: @@
 </code>
 When SWIG is available, then after ''make'' it needs additionally ''make swig-pl'' to compile the SVN perl modules and libraries. \\
-''make && make swig-perl && make install && make install-swig-pl'' should then install PERL to something like \\
+''make && make swig-pl && make install && make install-swig-pl'' should then install the PERL bindings to something like \\
 // /usr/lib/perl5/site_perl/5.10.1/i686-linux-thread-multi-ld/SVN// directory. \\
@@ Line 19: / Line 19: @@
-===== git svn checkout -r 1 ==
+===== git svn clone -r 1 ==
 Inside a new created directory then run these commands :
 <code bash>
-git svn clone -r 1 https://svn.code.sf.net/p/crossfire/code ;echo $?
+git svn clone -r 1 svn://svn.code.sf.net/p/crossfire/code ;echo $?
 </code>
 Which should print to the terminal
->Initialized empty Git repository in /mnt/sdb16/CROSSFIRE/client_svn/git_experiments/code/.git/
+>Initialized empty Git repository in /mnt/sdb16/CROSSFIRE/svn/git_experiments/code/.git/
 >W: +empty_dir: trunk
 >r1 = a967a85ee09bcf27915ff5eb652a10a7dc0d4a89 (refs/remotes/git-svn)
 >Checked out HEAD:
->  https://svn.code.sf.net/p/crossfire/code r1
+>  svn:%%//%%svn.code.sf.net/p/crossfire/code r1
 >creating empty directory: trunk
 >0
-And crate a directory "code" with a hidden .git folder structure.
+And create a directory "code" with a hidden .git/ folder and a trunk/ folder structure.
+Inside the **.git** folder there is a file named **config** which should look like
+<code conf>
+[core]
+	repositoryformatversion = 0
+	filemode = true
+	bare = false
+	logallrefupdates = true
+[svn-remote "svn"]
+	url = svn://svn.code.sf.net/p/crossfire/code
+	fetch = :refs/remotes/git-svn
+</code>
 Now it needs to change into the new 'code' directory :
@@ Line 39: / Line 52: @@
 </code>
-Inside this code directory we start to "fetch" revision by revision :
+Then run git svn log and git log:
+<code bash>
+ git svn log
+------------------------------------------------------------------------
+r1 | (no author) | 1999-03-29 03:46:48 -0100 (Mon, 29 Mar 1999) | 2 lines
+New repository initialized by cvs2svn.
+------------------------------------------------------------------------
+ git log
+commit c03bc89287c20c60c8d52377771046f54166d4eb (HEAD -> master)
+Author: (no author) <(no author)@282e977c-c81d-0410-88c4-b93c2d0d6712>
+Date:   Mon Mar 29 04:46:48 1999 +0000
+    New repository initialized by cvs2svn.
+    git-svn-id: svn://svn.code.sf.net/p/crossfire/code@1 282e977c-c81d-0410-88c4
+-b93c2d0d6712
+</code>
+===== git svn fetch -r 2 svn ==
+Inside this code directory we start to "fetch" revision by revision until -r5 \\
+with an [[#git svn rebase -l]] after each fetch :
 <code bash>
  git svn fetch -r 2 svn;echo $?
+	A	trunk/arch/spell/rod_light.111.xpm
+	A	trunk/arch/spell/rod_light.arc
+	A	trunk/arch/spell/rod_light.112.xpm
+	A	trunk/arch/spell/rod_light.113.xpm
+	A	trunk/arch/spell/rod_heavy.111
+	A	trunk/arch/dev/README
+	A	trunk/arch/dev/xpm.template
+r2 = e8b6556cff76da629a33f2f20c5e3388df081fca (refs/remotes/git-svn)
+Auto packing the repository in background for optimum performance.
+See "git help gc" for manual housekeeping.
 </code>
+When you get errors like
 >W: Ignoring error from SVN, path probably does not exist: (175002): RA layer request failed: REPORT request >on '/p/crossfire/code/!svn/rvr/2' failed
 >W: Do not be alarmed at the above message git-svn is just searching aggressively for old history.
 >This may take a while on large repositories
 >0hecked through r2
+then maybe change the .git/config entry value for the key 'url' from https: to svn: \\
+''url = https:%%//%%svn.code.sf.net/p/crossfire/code'' -> ''url = svn:%%//%%svn.code.sf.net/p/crossfire/code'' .
-And then the files start to appear with revision 3 :
+When the fetch has finished, then run git svn log :
 <code bash>
-git svn fetch -r 3 svn;echo $?
+git svn log
-	A	trunk/arch/gods/supernatural/valriel.arc
+------------------------------------------------------------------------
-	A	trunk/arch/gods/supernatural/devourers.arc
+r2 | uid200 | 1999-03-29 03:46:48 -0100 (Mon, 29 Mar 1999) | 2 lines
-	A	trunk/arch/gods/supernatural/gorokh.arc
-	A	trunk/arch/gods/elemental/ruggilli.111
+Initial revision
-	A	trunk/arch/gods/elemental/ruggilli.211
-	A	trunk/arch/gods/elemental/ruggilli.112
+------------------------------------------------------------------------
-	A	trunk/arch/skills/singing.arc
+r1 | (no author) | 1999-03-29 03:46:48 -0100 (Mon, 29 Mar 1999) | 2 lines
+New repository initialized by cvs2svn.
+------------------------------------------------------------------------
 </code>
+===== git svn rebase -l ==
+The downloaded files are still kept inside the data pack files; \\
+to make them show up it needs to **rebase locally** :
+<code bash>
+  git svn rebase -l
+First, rewinding head to replay your work on top of it...
+Fast-forwarded master to refs/remotes/git-svn.
+</code>
+Now the trunk/arch folder has some files to view .
+**Note**: Do not forget the **-l** option for rebase; without that option it would rebase against the HEAD of the svn tree, \\
+downloading all the 20000+ revisions !
+And ''git log'' tells us :
+<code bash>
+ git log
+commit e8b6556cff76da629a33f2f20c5e3388df081fca (HEAD -> master, git-svn)
+Author: uid200 <uid200@282e977c-c81d-0410-88c4-b93c2d0d6712>
+Date:   Mon Mar 29 04:46:48 1999 +0000
+    Initial revision
+    git-svn-id: svn://svn.code.sf.net/p/crossfire/code@2 282e977c-c81d-0410-88c4-b
+c2d0d6712
+commit c03bc89287c20c60c8d52377771046f54166d4eb
+Author: (no author) <(no author)@282e977c-c81d-0410-88c4-b93c2d0d6712>
+Date:   Mon Mar 29 04:46:48 1999 +0000
+    New repository initialized by cvs2svn.
+    git-svn-id: svn://svn.code.sf.net/p/crossfire/code@1 282e977c-c81d-0410-88c4-b93c2d0d6712
+</code>
+===== git tag -m "MESSAGE" Tag-Name ==
+When --revision 5 had been fetched, the "initial" commit has been completed and the first changes \\
+to the code will be committed next revision. \\
+Now it is time to --tag it and before adding some meaningful email and user name:
+<code bash>
+git config user.email anonymouse@puppy.pc
+git config user.name anonymouse
+git tag -m "Revision -r5: End of initial commits." InitialCommits-r5
+</code>
+===== git checkout -b trunk ==
+And to make the "trunk" the next "master" :
+<code bash>
+ git checkout -b trunk
+Switched to a new branch 'trunk'
+ git branch
+  master
+* trunk
+</code>
+And from now on until -r 1000 we use this **bash** script to update until REVISION_UPPER_LIMIT \\
+placed one level outside this code directory :
+<code bash>
+#!/bin/ash
+ERROR=${ERROR:=1}
+ERR=${ERR:-$ERROR} #ERR var already used as /dev/null OR /dev/stderr
+_err(){
+test "$ERROR" || return 0
+echo -e "$0:ERROR:$*"  >&2
+}
+_exit()
+{
+local RV
+test "$*" || { _err "Usage:_exit EXITCODE MESSAGE"; }
+RV=$1
+[ "${RV//[[:digit:]]/}" ] && { _err "\$1 must be a digit number."; RV=255; } || shift
+echo "$*" >&2
+case ${MY_SELF##*/} in
+ash*|bash*|sh*) return $RV;;
+*) exit $RV;;
+esac
+}
+REVISION_UPPER_LIMIT=1000
+cd code || _exit 1 "Unable to change cd into dir code/ ."
+git checkout trunk || _exit 3 "Could not checkout trunk."
+cd trunk || _exit 1 "Unable to change cd into dir trunk/ ."
+git svn rebase -l || _exit 9 "Could not rebase beforehand."
+INFO=`git svn info` || _exit 2 "git svn info returned '$?' ."
+REVISION=`echo "$INFO" | grep -m 1 '^Revision:' | awk '{print $2}'`
+test "$REVISION" || _exit 5 "Could not obtain Revision Number."
+test "${REVISION//[0-9]/}" && _exit 6 "Revision Number not a number."
+REVISION=$((REVISION + 1))
+test $REVISION -lt $REVISION_UPPER_LIMIT || _exit 7 "Revision $REVISION greater-equal REVISION_UPPER_LIMIT $REVISION_UPPER_LIMIT . Nothing to do."
+for r in `seq $REVISION 1 $REVISION_UPPER_LIMIT`
+do
+ c=0
+ while :; do
+  git svn fetch -r $r svn  && break 1
+  c=$((c+1))
+  test $c -gt 9 && break 2
+  sleep 2
+ done
+ git svn rebase -l || break 1
+sleep 1
+done
+echo
+echo $0 finished after fetching revision $r
+</code>
+The above code will take some time, expect 5 seconds each fetch ( 6000 sec = 100 minutes ) .

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