cede752653
This updates the use of git-update-ref in git-branch, git-tag and git-commit to make them safer in a few corner cases as demonstration. - git-tag makes sure that the named tag does not exist, allows you to edit tag message and then creates the tag. If a tag with the same name was created by somebody else in the meantime, it used to happily overwrote it. Now it notices the situation. - git-branch -d and git-commit (for the initial commit) had the same issue but with smaller race window, which is plugged with this. Signed-off-by: Junio C Hamano <junkio@cox.net>
132 lines
2.7 KiB
Bash
Executable File
132 lines
2.7 KiB
Bash
Executable File
#!/bin/sh
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USAGE='[-l] [(-d | -D) <branchname>] | [[-f] <branchname> [<start-point>]] | -r'
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LONG_USAGE='If no arguments, show available branches and mark current branch with a star.
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If one argument, create a new branch <branchname> based off of current HEAD.
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If two arguments, create a new branch <branchname> based off of <start-point>.'
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SUBDIRECTORY_OK='Yes'
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. git-sh-setup
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headref=$(git-symbolic-ref HEAD | sed -e 's|^refs/heads/||')
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delete_branch () {
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option="$1"
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shift
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for branch_name
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do
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case ",$headref," in
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",$branch_name,")
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die "Cannot delete the branch you are on." ;;
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,,)
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die "What branch are you on anyway?" ;;
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esac
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branch=$(git-show-ref --verify --hash -- "refs/heads/$branch_name") &&
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branch=$(git-rev-parse --verify "$branch^0") ||
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die "Seriously, what branch are you talking about?"
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case "$option" in
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-D)
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;;
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*)
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mbs=$(git-merge-base -a "$branch" HEAD | tr '\012' ' ')
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case " $mbs " in
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*' '$branch' '*)
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# the merge base of branch and HEAD contains branch --
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# which means that the HEAD contains everything in both.
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;;
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*)
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echo >&2 "The branch '$branch_name' is not a strict subset of your current HEAD.
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If you are sure you want to delete it, run 'git branch -D $branch_name'."
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exit 1
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;;
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esac
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;;
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esac
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git update-ref -d "refs/heads/$branch_name" "$branch"
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echo "Deleted branch $branch_name."
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done
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exit 0
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}
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ls_remote_branches () {
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git-rev-parse --symbolic --all |
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sed -ne 's|^refs/\(remotes/\)|\1|p' |
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sort
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}
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force=
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create_log=
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while case "$#,$1" in 0,*) break ;; *,-*) ;; *) break ;; esac
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do
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case "$1" in
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-d | -D)
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delete_branch "$@"
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exit
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;;
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-r)
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ls_remote_branches
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exit
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;;
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-f)
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force="$1"
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;;
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-l)
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create_log="yes"
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;;
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--)
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shift
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break
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;;
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-*)
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usage
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;;
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esac
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shift
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done
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case "$#" in
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0)
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git-rev-parse --symbolic --branches |
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sort |
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while read ref
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do
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if test "$headref" = "$ref"
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then
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pfx='*'
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else
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pfx=' '
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fi
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echo "$pfx $ref"
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done
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exit 0 ;;
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1)
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head=HEAD ;;
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2)
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head="$2^0" ;;
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esac
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branchname="$1"
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rev=$(git-rev-parse --verify "$head") || exit
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git-check-ref-format "heads/$branchname" ||
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die "we do not like '$branchname' as a branch name."
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prev=''
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if git-show-ref --verify --quiet -- "refs/heads/$branchname"
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then
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if test '' = "$force"
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then
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die "$branchname already exists."
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elif test "$branchname" = "$headref"
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then
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die "cannot force-update the current branch."
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fi
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prev=`git rev-parse --verify "refs/heads/$branchname"`
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fi
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if test "$create_log" = 'yes'
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then
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mkdir -p $(dirname "$GIT_DIR/logs/refs/heads/$branchname")
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touch "$GIT_DIR/logs/refs/heads/$branchname"
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fi
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git update-ref -m "branch: Created from $head" "refs/heads/$branchname" "$rev" "$prev"
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