I have a script in one of my iOS apps that should get the git revision hash and put it in the version number. In this script I run git --git-dir="$PROJECT_DIR" show -s --pretty=format:%h for that. However, I get the message that the directory isn't a git repository. If I echo the PROJECT_DIR var and go to the terminal the following works:
cd projectDirPath
git show -s --pretty=format:%h
What doesn't work is:
git --git-dir=projectDirPath show -s --pretty=format:%h
Am I missing something? The documentation states, that I can specify the path to a git repository with --git-dir and the specified path obviously is a git repository as all the git commands work without any problem if I first cd into that path. However if I am not in this path, specifing --git-dir doesn't work.
Best regards,
Michael
When using --git-dir, you need to point at the .git folder of your repository. Try:
git --git-dir=projectDirPath/.git show -s --pretty=format:%h
I use to have an issue remembering this myself. To help me remember what to do, I try to remember that the option is asking for exactly what it wants: the path to the .git directory (git-dir).
Apart of --git-dir, also setting --work-tree may help. For the script, it's good to use relevant environments (it's easier), e.g.
#!/bin/bash -ex
export GIT_WORK_TREE=/path/to/repo
export GIT_DIR=/path/to/repo/.git
git show -s --pretty=format:%h
You are looking for the git -C command line option.
-C <path>
Run as if git was started in instead of the current
working directory. When multiple -C options are given, each
subsequent non-absolute -C <path> is interpreted relative to the
preceding -C <path>. If <path> is present but empty, e.g. -C "",
then the current working directory is left unchanged.
This option affects options that expect path name like --git-dir
and --work-tree in that their interpretations of the path names
would be made relative to the working directory caused by the -C
option. For example the following invocations are equivalent:
git --git-dir=a.git --work-tree=b -C c status
git --git-dir=c/a.git --work-tree=c/b status
