Performing a closure merge operation

A computer program product for data management, the computer program product comprising:

• one or more computer readable storage media and program instructions stored on the one or more computer readable storage media, the program instructions comprising:
• program instructions to identify a source closure, a target file set, and a previously merged closure, wherein the source closure is a closure of files that includes changed files to merge into the target file set, and wherein the previously merged closure is a closure of files previously merged into the target file set;
• program instructions to load the identified source closure, the previously merged closure, and a closure of ancestor files shared by the identified source closure and the previously merged closure into a merge session;
• and
• program instructions to determine one or more file merge conflicts in the merge session based on differences between a comparison of the identified source closure to the closure of ancestor files and a comparison of the previously merged closure to the closure of ancestor files.

A computer system for data management, the computer system comprising:

• one or more computer processors;
• one or more computer readable storage media;
• and
• program instructions stored on the computer readable storage media for execution by at least one of the one or more processors, the program instructions comprising:
• program instructions to identify a source closure, a target file set, and a previously merged closure, wherein the source closure is a closure of files that includes changed files to merge into the target file set, and wherein the previously merged closure is a closure of files previously merged into the target file set;
• program instructions to load the identified source closure, the previously merged closure, and a closure of ancestor files shared by the identified source closure and the previously merged closure into a merge session;
• and
• program instructions to determine one or more file merge conflicts in the merge session based on differences between a comparison of the identified source closure to the closure of ancestor files and a comparison of the previously merged closure to the closure of ancestor files.