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feat: add git_set_identity script
Signed-off-by: Sebastian Davids <[email protected]>
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‎docs/user-guide/modules/ROOT/pages/scripts/git/git-set-identity.adoc

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// SPDX-FileCopyrightText: © 2025 Sebastian Davids <[email protected]>
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// SPDX-License-Identifier: Apache-2.0
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= git_set_identity
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:script_url: https://github.com/sdavids/sdavids-shell-misc/blob/main/scripts/git/git_set_identity.sh.sh
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{script_url}[This script^] will set the identity (`user.name`, `user.email`, and `user.signingKey`) in the Git repositories of the given directory.
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The following parameters are required:
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`e` :: the email to be used for the identity and GPG secret key retrieval; can be omitted if `git config get user.email` is set, and you want to use its value
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`n` :: the name to be used for the identity; can be omitted if `git config get user.name` is set, and you want to use its value
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The following parameter is optional:
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`d` :: the directory (`$PWD` if not given) containing the Git repositories
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[NOTE]
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====
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This script will not recursively search the given directory for Git repositories--only direct child directories are considered.
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====
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[NOTE]
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====
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This script will set up https://git-scm.com/book/en/v2/Git-Tools-Signing-Your-Work[GPG signing] under the following conditions:
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. `git config get gpg.program` or `gpg`/`gpg2` is installed
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. a GPG secret key for the given email exists
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In that case, the following Git configuration will be applied in addition to `user.email` and `user.name`:
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commit.gpgSign :: set to `true`
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tag.forceSignAnnotated :: set to `true`
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tag.gpgSign :: set to `true`
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user.signingKey :: set to the first secret key returned by `--list-secret-keys` for the given email
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====
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[TIP]
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====
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This script is useful if you do not use the same identity in all the projects you work on.
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See: <<example>>
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====
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== Usage
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[,shell]
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----
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$ scripts/git/git_set_identity.sh -e [email protected]
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$ scripts/git/git_set_identity.sh \
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-d ~/workspaces/mutiny \
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-e [email protected]
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$ scripts/git/git_set_identity.sh \
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-d ~/workspaces/cardiff-electric \
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-e [email protected] \
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-n 'Catherine Howe'
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----
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== Example
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Cameron works for two companies and also has personal projects:
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[,shell]
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----
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$ tree --noreport ~/workspaces
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/Users/example/workspaces
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├── cardiff-electric
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│ ├── backend
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│ └── frontend
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├── mutiny
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│ └── giant
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└── personal
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├── sandbox
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└── secret-project
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----
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She has three GPG secret keys--one for each company and one personal:
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[,shell]
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----
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$ gpg --list-secret-keys
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/Users/example/.gnupg/pubring.kbx
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-----------------------------------------
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sec rsa4096/49F1A380A5660737 2025-02-02 [SC] [expires: 2029-02-02]
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Key fingerprint = 3956 4B7A A0B5 1F88 A8F8 BCBC 49F1 A380 A566 0737
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uid [ultimate] Cameron Howe <[email protected]>
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ssb rsa4096/8B68480DE279CA88 2025-02-02 [E] [expires: 2029-02-02]
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sec rsa4096/EC073F7EFD23C1FA 2025-02-02 [SC] [expires: 2029-02-02]
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Key fingerprint = 2DAF 54C7 67F3 FD24 EACF A1B5 EC07 3F7E FD23 C1FA
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uid [ultimate] Cameron Howe <[email protected]>
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ssb rsa4096/6363EEBF938865CF 2025-02-02 [E] [expires: 2029-02-02]
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sec rsa4096/77254FBC1027F48D 2025-02-02 [SC] [expires: 2029-02-02]
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Key fingerprint = C09B 7924 274A 9865 545C 6512 7725 4FBC 1027 F48D
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uid [ultimate] Catherine Howe <[email protected]>
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ssb rsa4096/6C2E4F6CB45DD27E 2025-02-02 [E] [expires: 2029-02-02]
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----
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She has configured her personal GPG key in her global Git configuration and signs commits and tags by default:
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[,shell]
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----
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$ cat ~/.gitconfig
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[user]
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name = Cameron Howe
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email = [email protected]
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signingkey = 2DAF54C767F3FD24EACFA1B5EC073F7EFD23C1FA
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[commit]
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gpgsign = true
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[tag]
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forceSignAnnotated = true
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gpgsign = true
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----
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With this configuration the following identities will be used for commits and tags:
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[,shell]
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----
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$ find ~/workspaces/cardiff-electric -mindepth 1 -maxdepth 1 -type d -exec sh -c '(cd {} && echo "$PWD" && echo " $(git config get user.name) <$(git config get user.email)> $(git config get user.signingkey)")' \;
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/Users/example/workspaces/cardiff-electric/frontend
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Cameron Howe <[email protected]> 2DAF54C767F3FD24EACFA1B5EC073F7EFD23C1FA
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/Users/example/workspaces/cardiff-electric/backend
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Cameron Howe <[email protected]> 2DAF54C767F3FD24EACFA1B5EC073F7EFD23C1FA
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$ find ~/workspaces/mutiny -mindepth 1 -maxdepth 1 -type d -exec sh -c '(cd {} && echo "$PWD" && echo " $(git config get user.name) <$(git config get user.email)> $(git config get user.signingkey)")' \;
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/Users/example/workspaces/mutiny/giant
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Cameron Howe <[email protected]> 2DAF54C767F3FD24EACFA1B5EC073F7EFD23C1FA
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$ find ~/workspaces/personal -mindepth 1 -maxdepth 1 -type d -exec sh -c '(cd {} && echo "$PWD" && echo " $(git config get user.name) <$(git config get user.email)> $(git config get user.signingkey)")' \;
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/Users/example/workspaces/personal/secret-project
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Cameron Howe <[email protected]> 2DAF54C767F3FD24EACFA1B5EC073F7EFD23C1FA
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/Users/example/workspaces/personal/sandbox
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Cameron Howe <[email protected]> 2DAF54C767F3FD24EACFA1B5EC073F7EFD23C1FA
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----
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She now uses this script to configure the identities for the companies' projects:
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[,shell]
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----
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$ scripts/git/git_set_identity.sh \
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-d ~/workspaces/cardiff-electric \
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-e [email protected] \
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-n 'Catherine Howe'
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Catherine Howe <[email protected]> C09B7924274A9865545C651277254FBC1027F48D - /Users/example/workspaces/cardiff-electric/backend
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Catherine Howe <[email protected]> C09B7924274A9865545C651277254FBC1027F48D - /Users/example/workspaces/cardiff-electric/frontend
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$ scripts/git/git_set_identity.sh \
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-d ~/workspaces/mutiny \
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-e [email protected]
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Cameron Howe <[email protected]> 39564B7AA0B51F88A8F8BCBC49F1A380A5660737 - /Users/example/workspaces/mutiny/giant
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----
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The following identities will be used for commits and tags now:
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[,shell]
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----
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$ find ~/workspaces/cardiff-electric -mindepth 1 -maxdepth 1 -type d -exec sh -c '(cd {} && echo "$PWD" && echo " $(git config get user.name) <$(git config get user.email)> $(git config get user.signingkey)")' \;
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/Users/example/workspaces/cardiff-electric/frontend
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Catherine Howe <[email protected]> C09B7924274A9865545C651277254FBC1027F48D
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/Users/example/workspaces/cardiff-electric/backend
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Catherine Howe <[email protected]> C09B7924274A9865545C651277254FBC1027F48D
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$ find ~/workspaces/mutiny -mindepth 1 -maxdepth 1 -type d -exec sh -c '(cd {} && echo "$PWD" && echo " $(git config get user.name) <$(git config get user.email)> $(git config get user.signingkey)")' \;
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/Users/example/workspaces/mutiny/giant
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Cameron Howe <[email protected]> 39564B7AA0B51F88A8F8BCBC49F1A380A5660737
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$ find ~/workspaces/personal -mindepth 1 -maxdepth 1 -type d -exec sh -c '(cd {} && echo "$PWD" && echo " $(git config get user.name) <$(git config get user.email)> $(git config get user.signingkey)")' \;
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/Users/example/workspaces/personal/secret-project
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Cameron Howe <[email protected]> 2DAF54C767F3FD24EACFA1B5EC073F7EFD23C1FA
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/Users/example/workspaces/personal/sandbox
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Cameron Howe <[email protected]> 2DAF54C767F3FD24EACFA1B5EC073F7EFD23C1FA
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----
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== More Information
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* https://git-scm.com/docs/git-config#Documentation/git-config.txt-authorname[Git user.name & user.email]
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* https://git-scm.com/book/en/v2/Git-Tools-Signing-Your-Work[GPG signing]
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* https://git-scm.com/docs/git-config#Documentation/git-config.txt-usersigningKey[user.signingKey]
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* https://git-scm.com/docs/git-config#Documentation/git-config.txt-commitgpgSign[commit.gpgSign]
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* https://git-scm.com/docs/git-config#Documentation/git-config.txt-taggpgSign[tag.gpgSign]
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* https://git-scm.com/docs/git-config#Documentation/git-config.txt-tagforceSignAnnotated[tag.forceSignAnnotated]
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* https://man.archlinux.org/man/core/gnupg/gpg.1.en[gpg]

‎docs/user-guide/modules/ROOT/pages/scripts/git/git.adoc

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xref:scripts/git/git-get-short-hash.adoc[]:: return the short hash of the HEAD commit
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xref:scripts/git/git-ignore-all.adoc[]:: create a `.gitignore` file ignoring everything for a given repository
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xref:scripts/git/git-is-working-tree-clean.adoc[]:: check whether the Git working tree is clean
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xref:scripts/git/git-set-identity.adoc[]:: set the identity (`user.name`, `user.email`, and `user.signingKey`) in the Git repositories of the given directory
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Related: xref:functions/git/git.adoc[Git Functions]

‎scripts/git/git_set_identity.sh

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#!/usr/bin/env sh
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# SPDX-FileCopyrightText: © 2025 Sebastian Davids <[email protected]>
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# SPDX-License-Identifier: Apache-2.0
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set -u
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name="$(git config get user.name)"
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# shellcheck disable=SC2181
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if [ $? -ne 0 ]; then
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name=''
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fi
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email="$(git config get user.email)"
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# shellcheck disable=SC2181
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if [ $? -ne 0 ]; then
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email=''
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fi
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gpg_program="$(git config get gpg.program)"
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# shellcheck disable=SC2181
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if [ $? -ne 0 ]; then
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gpg_program='gpg'
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fi
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set -e
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while getopts ':d:e:n:' opt; do
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case "${opt}" in
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d)
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base_dir="${OPTARG}"
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;;
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e)
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email="${OPTARG}"
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;;
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n)
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name="${OPTARG}"
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;;
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?)
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echo "Usage: $0 [-d <base_dir>] [-e <email>] [-n <name>]" >&2
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exit 1
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;;
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esac
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done
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readonly base_dir="${base_dir:-$PWD}"
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readonly email
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readonly name
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if [ ! -d "${base_dir}" ]; then
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printf "The directory '%s' does not exist.\n" "${base_dir}" >&2
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exit 2
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fi
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if [ -z "${email}" ]; then
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echo '-e <email> is required because user.email is not set in your global Git configuration' >&2
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exit 3
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fi
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if [ -z "${name}" ]; then
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echo '-n <name> is required because user.name is not set in your global Git configuration' >&2
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exit 4
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fi
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if [ -z "$(ls -A "${base_dir}")" ]; then
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# base_dir empty nothing to do
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exit 0
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fi
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if command -v "${gpg_program}" >/dev/null 2>&1; then
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cmd="${gpg_program} --list-secret-keys --with-colons \"${email}\" 2>&1 | sed -E -n -e 's/^fpr:::::::::([0-9A-F]+):$/\1/p' | head -n 1"
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key="$(eval "${cmd}")"
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if [ -z "${key}" ]; then
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printf "GPG key for '%s' does not exists--disabling GPG signing.\n\n" "${email}" >&2
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fi
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else
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if [ "${gpg_program}" = 'gpg' ] && command -v gpg2 >/dev/null 2>&1; then
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key="$(gpg2 --list-secret-keys --with-colons "${email}" 2>&1 | sed -E -n -e 's/^fpr:::::::::([0-9A-F]+):$/\1/p' | head -n 1)"
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if [ -z "${key}" ]; then
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printf "GPG key for '%s' does not exists--disabling GPG signing.\n\n" "${email}" >&2
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fi
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else
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key=''
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printf "gpg.program '%s' does not exists--disabling GPG signing.\n\n" "${gpg_program}" >&2
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fi
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fi
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unset gpg_program
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readonly key
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cd "${base_dir}"
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if [ -n "${key}" ]; then
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for dir in ./*/; do
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cd "${dir}"
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if [ "$(git rev-parse --is-inside-work-tree 2>/dev/null)" = 'true' ]; then
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# https://git-scm.com/docs/git-config#_variables
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git config set user.name "${name}"
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git config set user.email "${email}"
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git config set user.signingkey "${key}"
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git config set --bool commit.gpgsign true
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git config set --bool tag.gpgsign true
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git config set --bool tag.forcesignannotated true
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echo "$(git config get user.name) <$(git config get user.email)> $(git config get user.signingkey) - $PWD"
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fi
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cd ..
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done
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else
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for dir in ./*/; do
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cd "${dir}"
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if [ "$(git rev-parse --is-inside-work-tree 2>/dev/null)" = 'true' ]; then
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# https://git-scm.com/docs/git-config#_variables
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git config set user.name "${name}"
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git config set user.email "${email}"
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git config set user.signingkey ''
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git config set --bool commit.gpgsign false
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git config set --bool tag.gpgsign false
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git config set --bool tag.forcesignannotated false
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echo "$(git config get user.name) <$(git config get user.email)> - $PWD"
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fi
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cd ..
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done
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fi

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